CN105648361A

CN105648361A - High-cleanliness environment-friendly stainless steel coffeepot material and preparation method thereof

Info

Publication number: CN105648361A
Application number: CN201610233599.2A
Authority: CN
Inventors: 焦德宏
Original assignee: Wanbaoli Stainless Steel Products (dongguan) Co Ltd
Current assignee: Wanbaoli Stainless Steel Products (dongguan) Co Ltd
Priority date: 2016-04-15
Filing date: 2016-04-15
Publication date: 2016-06-08

Abstract

The invention relates to the technical field of coffeepot materials, particularly a high-cleanliness environment-friendly stainless steel coffeepot material and a preparation method thereof. The material comprises the following chemical components in percentage by weight: 0.16-0.20% of C, 0.37-0.41% of N, 0.6-1.0% of Si, 1.2-1.6% of Mn, 25-27% of Cr, 13-15% of Ni, 4.1-4.5% of Mo, 1.2-1.6% of Nb, 1.5-1.9% of Ti, 0.2-0.4% of Ca, 0.01-0.05% of Sn, 0.004-0.008% of Re, and the balance of iron and impurity. The stainless steel coffeepot material has the advantages of higher cleanliness, environment friendliness, higher strength, higher toughness, higher hardness, higher wear resistance, higher heat resistance, higher corrosion resistance and excellent comprehensive properties.

Description

A kind of high clean environmental protection stainless steel coffee pot material and its preparation method

Technical field

The present invention relates to coffee pot material technical field, it is specifically related to a kind of high clean environmental protection stainless steel coffee pot material and its preparation method.

Background technology

Coffee pot is the utensil of a kind of brewing coffee, along with the raising of people's living standard, the use range of coffee pot is more and more wider, the kind of coffee pot also gets more and more, there are stainless steel coffee pot, plastics coffee pot, glass coffee pot etc., stainless steel coffee pot, owing to having higher toughness, intensity, wear resistance, thermotolerance and erosion resistance, is the main sale kind on market.

Owing to the environment for use of coffee pot is more special, stainless steel coffee pot needs the stainless material manufacture with relatively high-cleanness, high, and stainless material of the prior art can't meet the requirement using at present and manufacturing completely, there is cleanliness factor difference, the shortcoming such as not environmentally, it is thus desirable to develop the stainless material of a kind of high cleaning and environmental protection.

Summary of the invention

The shortcoming and defect existed to overcome in prior art, it is an object of the invention to provide a kind of high clean environmental protection stainless steel coffee pot material, this stainless steel coffee pot material has higher cleanliness factor, environmental protection, and also there is higher intensity, toughness, hardness, wear resistance, thermotolerance and erosion resistance, excellent combination property.

Another object of the present invention is to provide the preparation method of a kind of high clean environmental protection stainless steel coffee pot material, the material-mix of this preparation method and the present invention uses, the optimum performance of material can be played, technique is simple, convenient operation and control, steady quality, production efficiency height, production environmental protection, can large-scale industrial production.

The object of the present invention is achieved through the following technical solutions: a kind of high clean environmental protection stainless steel coffee pot material, its chemical composition comprises the element of following weight percent: C:0.16-0.20%, N:0.37-0.41%, Si:0.6-1.0%, Mn:1.2-1.6%, Cr:25-27%, Ni:13-15%, Mo:4.1-4.5%, Nb:1.2-1.6%, Ti:1.5-1.9%, Ca:0.2-0.4%, Sn:0.01-0.05%, Re:0.004-0.008%, surplus are iron and impurity.

Preferably, its chemical composition comprises the element of following weight percent: C:0.17-0.19%, N:0.38-0.40%, Si:0.7-0.9%, Mn:1.3-1.5%, Cr:25.5-26.5%, Ni:13.5-14.5%, Mo:4.2-4.4%, Nb:1.3-1.5%, Ti:1.6-1.8%, Ca:0.25-0.35%, Sn:0.02-0.04%, Re:0.005-0.007%, surplus are iron and impurity.

More preferred, its chemical composition comprises the element of following weight percent: C:0.18%, N:0.39%, Si:0.8%, Mn:1.4%, Cr:26%, Ni:14%, Mo:4.3%, Nb:1.4%, Ti:1.7%, Ca:0.3%, Sn:0.03%, Re:0.006%, surplus are iron and impurity.

The chemical composition design reason of the high clean environmental protection stainless steel coffee pot material of the present invention is as follows:

C:0.16-0.20%

C(carbon) it is powerful austenite generting element, therefore making the ratio of the martensitic phase in metal structure increase, C can play solid solution strengthening effect, fuses in crystalline network with the form of interstitial solid solution, thus create and introduce strain wherein, to strengthen the effect of interstitial solid solution; In addition, C has and forms cottrell atmosphere so that dislocation in metal structure obtains the effect of set, thus improves the intensity of material, and therefore, in order to effectively improve the intensity of material, the weight percent of C should control more than 0.16%. But, C Cr, Nb, Ti easily and in steel etc. combines and forms carbide, such as, when having Cr carbide at grain boundary, owing to the velocity of diffusion of Cr in austenite is relatively slow, Cr depletion layer can be produced near crystal boundary, toughness and the erosion resistance of material are reduced, therefore, in order to avoid too high toughness and the erosion resistance decline causing material of C, the weight percent of C should control below 0.20%. In the present invention, the weight percent of C is 0.16-0.20%, both can meet the requirement of strength of material, can ensure again toughness and the erosion resistance of material, it is preferable that, the weight percent of C is 0.17-0.19%, and more preferably, the weight percent of C is 0.18%.

N:0.37-0.41%

N(nitrogen) it is one of the strongest effective element forming austenite, the same with C, N is also the element strengthening interstitial solid solution, and is also the element forming cottrell atmosphere; In addition, N can also be combined to form duster compound by Cr or Mo in steel, thus produces the effect improving intensity, in order to effectively make austenite stablize mutually by adding N, and effectively making the intensity of material improve by forming Mo-N duster compound, the weight percent of N should control more than 0.37%. But, N austenite mutually in solid solution degree be restricted, when adding relatively large N, pore can be produced when cast steel, although the element having high-affinity with N by adding (such as Cr or Mn) improves the limit of its solid solution, this kind of phenomenon can be suppressed to a certain extent, but when adding too much such element, need when steel is melted envrionment conditions (such as temperature etc.) to be controlled, cost is increased, therefore, in order to avoid the difficulty of the too high increase melting of N and casting, the weight percent of N should control below 0.41%. In the present invention, the weight percent of N is 0.37-0.41%, both can meet the requirement of strength of material, can ensure again Drawing abillity, it is preferable that, the weight percent of N is 0.38-0.40%, and more preferably, the weight percent of N is 0.39%.

Si:0.6-1.0%

Si(silicon) it is ferrite former, play reductor and improve material erosion resistance, also it is the element of the intensity increasing steel simultaneously, solid solution can be there is in Si, thus produce to make stacking fault energy reduce and make the improved effect of mechanical characteristics, therefore, in order to effectively improve intensity and the erosion resistance of material, and playing good desoxydatoin, the weight percent of Si should control more than 0.6%. But it is unfavorable to the hot workability of material and toughness to add a large amount of Si, normal temperature compacted under is also unfavorable, in order to avoid too high hot workability and the toughness decline causing material of Si, the weight percent of Si should control below 1.0%. In the present invention, the weight percent of Si is 0.6-1.0%, both can meet intensity and the erosion resistance requirement of material, can ensure again hot workability and the toughness of material, preferably, the weight percent of Si is 0.7-0.9%, and more preferably, the weight percent of Si is 0.8%.

Mn:1.2-1.6%

Mn(manganese) it is austenite former, cost is low, Ni can be substituted and form austenite, when by steel melting and refining, Mn is used as reductor, and steel has very big strengthening effect, can improve the intensity of steel, hardness and wear resistance, in order to ensure intensity and the hardness of material, the weight percent of Mn should control more than 1.2%. But, the oxidation-resistance under high temperature can be produced disadvantageous effect by Mn, and the toughness of material and erosion resistance are reduced, and in order to avoid too high toughness and the erosion resistance decline causing material of Mn, the weight percent of Mn should control below 1.6%. In the present invention, the weight percent of Mn is 1.2-1.6%, both can meet intensity and the hardness requirement of material, can ensure again toughness and the erosion resistance of material, preferably, the weight percent of Mn is 1.3-1.5%, and more preferably, the weight percent of Mn is 1.4%.

Cr:25-27%

Cr(chromium) it is strongly is formed and stablize ferritic element, reduce austenitic area, along with Cr content increase in steel, austenitic stainless steel can occur ferritic structure; In addition, Cr is the main alloy element improving the strength of materials and erosion resistance, Cr can improve the erosion resistance of stainless steel in oxidizing acid, improve the local corrosion abilities such as its anticorrosion stress-resistant in chloride soln, spot corrosion and crevice corrosion, and Cr content is too low that martensite transformation temperature (Ms) also can be caused to raise, affect the performance of steel, therefore, in order to ensure intensity and the erosion resistance of material, the weight percent of Cr should control more than 25%. But Cr can reduce plasticity and the toughness of material while improving the intensity of steel, if its too high levels, not only increase cost, affecting economy, productivity declines, and weldability is unfavorable, the formability of some intermetallic phases also can be caused to increase, therefore, in order to avoid too high plasticity and the toughness decline causing material of Cr, the weight percent of Cr should control below 27%. In the present invention, the weight percent of Cr is 25-27%, both can meet intensity and the erosion resistance requirement of material, can ensure again plasticity and the toughness of material, it is preferable that, the weight percent of Cr is 25.5-26.5%, and more preferably, the weight percent of Cr is 26%.

Ni:13-15%

Ni(nickel) it is the best element forming austenite and stable austenite, to improving, the corrosion resistance nature of material, mechanical property and hot workability all have positive effect to Ni, contribute to the performance of the corrosion-resistant effect of Cr; The interpolation of Ni simultaneously can also improve plasticity and the toughness of ferritic stainless steel, amount can play the effect of solution strengthening time few, also precipitate can be formed with other element when measuring many, play the effect of ageing strengthening, in order to effectively make austenite stablize mutually by adding Ni, and improving intensity and the erosion resistance of material, the weight percent of Ni should control more than 13%. But adding Ni in a large number can make Ms point be reduced to the situation that cannot obtain martensitic stucture with common quench treatment, thus also cannot make the high strength required for steel acquisition, the corrosion resistance nature of material also can be made to reduce, and Ni shortage of resources, price is more expensive, should save use, therefore as far as possible, in order to avoid Ni too high cause material intensity and erosion resistance reduce and cost-saving, the weight percent of Ni should control below 15%. In the present invention, the weight percent of Ni is 13-15%, both can meet intensity and the erosion resistance requirement of material, can save production cost again, it is preferable that, the weight percent of Ni is 13.5-14.5%, and more preferably, the weight percent of Ni is 14%.

Mo:4.1-4.5%

Mo(molybdenum) it is strong ferrite former, be conducive to improving the erosion resistance of material, particularly Mo is conducive to improving the erosion resistance of weld punching shear plane, its intensity can also be improved by solution strengthening, in order to improve intensity and the erosion resistance of material, the weight percent of Mo should control more than 4.1%. But Mo is high cost element, after corrosion resistance nature reaches capacity simultaneously, too high Mo content can promote the precipitation of intermetallic phase in austenitic stainless steel, affect mechanics and the processing characteristics of alloy, considering the deterioration of workability and the increase of material cost, the weight percent of Mo should control below 4.5%. In the present invention, the weight percent of Mo is 4.1-4.5%, both can meet intensity and the erosion resistance requirement of material, can save production cost again, it is preferable that, the weight percent of Mo is 4.2-4.4%, and more preferably, the weight percent of Mo is 4.3%.

Nb:1.2-1.6%

Nb(niobium) be ferrite former, it is possible to crystal grain thinning, it is to increase the yield strength of material, adds appropriate Nb at material, mainly plays two vital role, its one, play the effect of stabilizing element, in heat-treatment temperature range, long-time heat preservation; In steel, Nb element is fully combined with C, forms C-Nb compound, avoids the combination of C and Nb element, the corrosion resistance nature of material is ensured further; They are two years old, it is to increase the recrystallization temperature of steel, make the grain refining of steel, it is to increase the tensile strength of steel and yield strength, therefore, in order to improve tensile strength and the yield strength of material, the weight percent of Nb should control more than 1.2%. But the manufacturing process that excessive refractory element Nb can cause again material is complicated, in order to avoid, Nb is too high causes the manufacturing process of material complicated, and the weight percent of Nb should control below 1.6%. In the present invention, the weight percent of Nb is 1.2-1.6%, both can meet tensile strength and the yield strength requirement of material, again can Simplified flowsheet, it is preferable that, the weight percent of Nb is 1.3-1.5%, and more preferably, the weight percent of Nb is 1.4%.

Ti:1.5-1.9%

Ti(titanium) it is stabilizing element, be mainly combined C, N compound formation preventing Cr with C, N and cause Cr-depleted region, thus reduce the erosion resistance of material, Ti is mainly combined with N; Ti can also improve the recrystallization temperature of steel, makes the grain refining of steel, it is to increase the tensile strength of steel and yield strength, therefore, in order to improve tensile strength and the yield strength of material, the weight percent of Ti should control more than 1.5%. But Ti also can have influence on the surface quality of steel as inclusion, simultaneously due to Ti in adition process oxidizable, certain difficulty can be brought to steel-making, in order to avoid Ti to cause the manufacturing process of material complicated, the weight percent of Ti should control below 1.9%. In the present invention, the weight percent of Ti is 1.5-1.9%, both can meet tensile strength and the yield strength requirement of material, can ensure again the quality of material, simplified manufacturing technique, it is preferable that, the weight percent of Ti is 1.6-1.8%, more preferred, the weight percent of Ti is 1.7%.

Ca:0.2-0.4%

Ca(calcium) in refining procedure, make steel-deoxidizing, Ca also improves hot workability and cleanliness factor, and in order to obtain these effects, the lower limit of Ca amount is 0.2%. On the other hand, if superfluously containing Ca, then the inclusiones such as CaO can be generated in steel in a large number, makes the toughness of steel reduce. Further, the inclusion such as CaO also becomes the starting point of pitting attack. Therefore, the upper limit of Ca amount is 0.4%. In the present invention, the weight percent of Ca is 0.2-0.4%, both can meet hot workability and the cleanliness factor requirement of material, can ensure again the toughness of material, preferably, the weight percent of Ca is 0.25-0.35%, and more preferably, the weight percent of Ca is 0.3%.

Sn:0.01-0.05%

Tin (Sn) is as machinability improved additives during low cutting speed. The content of tin more than 0.05%, should not add the Sn of 0.01-0.05% in stainless steel, it has been found that itself and Cr, Ti, Nb acting in conjunction can improve the acid-resistant corrosion of steel, and add a small amount of Sn, it is possible to saves expensive Ni. In the present invention, the weight percent of Sn is 0.01-0.05%, both can meet Drawing abillity and cleanliness factor requirement, can ensure again the erosion resistance of material, preferably, the weight percent of Sn is 0.02-0.04%, and more preferably, the weight percent of Sn is 0.03%.

Re:0.004-0.008%

In ferritic stainless steel, RE(rhenium) by adsorbing carbon atom in a large number, the total amount of ferritic stainless steel carbide precipitate is reduced, simultaneously by rotten inclusion, make the fracture apperance in crackle source region there occurs change, thus improve the impelling strength of steel, therefore, in order to improve the impelling strength of material, the weight percent of Re should control more than 0.004%. But too much adds Re, can react with the matrix of steel, form iron cerium brittlement phase, steel inclusion total amount can be caused to increase simultaneously, affect the cleanliness factor of steel, cause toughness to decline, therefore, in order to avoid too high cleanliness factor and the impelling strength decline causing material of Re, the weight percent of Re should control below 0.008%. In the present invention, the weight percent of Re is 0.004-0.008%, it is possible to make the cleanliness factor of material and impelling strength performance best. Preferably, the weight percent of Re is 0.005-0.007%, and more preferably, the weight percent of Re is 0.006%.

Preferably, by weight percentage, total content��0.1% of described impurity, wherein, P��0.015%, S��0.008%, H��0.003%, O��0.001%.

P(phosphorus) and S(sulphur) it is all the oxious component in steel, too high p and s content can cause the intensity of steel sharply to decline, and steel can be caused to become crisp, it is necessary to strict control. Therefore, the mass percentage of the P that the present invention adopts controls below 0.015%, and the mass percentage of S controls below 0.008%.

H(hydrogen) and O(oxygen) the serious toughness that affect material of meeting in stainless material, it is necessary to strictly control. Therefore, the mass percentage of the H that the present invention adopts controls below 0.003%, and the mass percentage of O controls below 0.001%.

Preferably, the chemical composition of described material also comprises the rare earth element of following weight percent: La:0.008-0.012%, Sc:0.004-0.008% and Nd:0.001-0.005%.

Rare-earth elements La (lanthanum) joins in stainless material, it is possible to changes the composition of steel inclusion, form, distribution and character, thus improves the various performances of steel, such as thermotolerance, toughness, weldability, wear resistance etc. Tufftride process is had the effect of oozing of urging significantly by rare-earth elements La, increases (��) phase content in compound layer, and makes surface hardness and wear resistance generation respective change; The resistance toheat that La can improve, it is to increase the erosion resistance of material surface, adds the impelling strength that La can effectively improve infiltration layer in right amount. In the present invention, the weight percent of La is 0.008-0.012%, both can meet the heat resistant requirements of material, can meet again erosion resistance and the impelling strength of material, preferably, the weight percent of La is 0.009-0.011%, and more preferably, the weight percent of La is 0.010%.

Rare earth Sc (scandium) can with the acting in conjunction of the Si in stainless material, it is ensured that material still has good antioxidant property at 1150 DEG C; And the existence of the element such as N, C and rare earth Sc so that it has the creep rupture strength suitable with nickel-base alloy, and the �� phase of fragility is precipitated with retarding action by N, it is to increase material structure stability under the high temperature conditions. The present invention is by the content of N and rare earth Sc in control stainless steel, and reduces the content of O and S in stainless steel, thus ensure that alloy has excellent thermotolerance and excellent plasticity, has and compares OCr₂₅Ni₂The better applied at elevated temperature performance of O, obviously reduces the content of Ni simultaneously, has effectively saved resource, reduced manufacturing cost. In the present invention, the weight percent of Sc is 0.004-0.008%, both can meet thermotolerance and the plasticity requirements of material, can reduce again manufacturing cost, preferably, the weight percent of Sc is 0.005-0.007%, and more preferably, the weight percent of Sc is 0.006%.

In ferritic stainless steel, rare earth element rare earth Nd (erbium) is by adsorbing carbon atom in a large number, the total amount of ferritic stainless steel carbide precipitate is reduced, simultaneously by rotten inclusion, make the fracture apperance in crackle source region there occurs change, thus improve the impelling strength of steel, therefore, in order to improve the impelling strength of material, the weight percent of Nd should control more than 0.001%. But too much adds rare earth Nd, can react with the matrix of steel, form iron cerium brittlement phase, steel inclusion total amount can be caused to increase simultaneously, affect the cleanliness factor of steel, cause toughness to decline, therefore, in order to avoid, Nd is too high causes the impelling strength of material to decline, and the weight percent of Nd should control below 0.005%. In the present invention, the weight percent of Nd is 0.001-0.005%, it is possible to make the impelling strength performance of material best, it is preferable that, the weight percent of Nd is 0.002-0.004%, and more preferably, the weight percent of Nd is 0.003%.

The present invention is by adding La, Sc and Nd tri-kinds of rare earth elements, it is possible to improves physical strength and the hardness of material, and increases wear resistance.

Preferably, the chemical composition of described material meets following formula:

0.55%��C+N��0.60% ... (1)

2.0%��Si+Mn��2.4% ... (2)

34.4��Cr+Ni-Mo��37.0% ... (3)

0.8%��Nb/Ti��1.6% ... (4)

0.25%��Ca+Sn+Re��0.45% ... (5)

Wherein, C, N, Si, Mn, Cr, Ni, Mo, Nb, Ti, Ca, Sn and Re represent the weight percent of each element respectively.

(1) (C+N) of formula is the factor affecting the intensity of material, bending machining performance and weld toughness and then affecting weld punch process performance, is limited in the present invention within the scope of 0.55%-0.60%. Proving by experiment, when (C+N) is less than 0.55%, the intensity of martensitic stucture is too low, even if becoming the mixed structure of ferrite+martensite, tensile strength can not reach more than 850MPa. When (C+N) is more than 0.60%, owing to C, N make martensite significantly harden, when C, N content height, the difference of hardness of soft ferrite and hard martensite is very big, savings distortion in its border during bending machining, easily produce crackle, so that the toughness of the bending machining performance of material and weld significantly reduces; In addition, when (C+N) is more than 0.60%, the punch process performance of weld significantly reduces, the reason that weld punch process performance reduces is in the mixed structure that the ferrite generated after welding and martensite are formed, due to C, N that solid solution in the martensite of the austenite phase transformation big from C, N solid solution ability is a large amount of, the intensity of martensite increases, and causes with soft ferritic intensity difference is excessive. Therefore, from the intensity improving material, (C+N) should control more than 0.55%, and from raising Drawing abillity, (C+N) should control below 0.60%.

(2) (Si+Mn) of formula is the factor of intensity and the toughness affecting material, is limited in the present invention within the scope of 2.0-2.4%. Proving by experiment, when (Si+Mn) is less than 2.0%, the strength of materials obtained is poor, and deoxidation effect is not good; When (Si+Mn) is greater than 2.4%, the materials hot working and the toughness that obtain are poor, therefore, from the intensity and the desoxydatoin that improve material, (Si+Mn) should controlling more than 2.0%, from the hot workability and the toughness that improve material, (Si+Mn) should control below 2.4%.

(3) (Cr+Ni-Mo) of formula is the factor of intensity and the erosion resistance affecting material, is limited in the present invention in the scope of 34.4-37.0%. Cr, Ni and Mo have the effect of erosion resistance, but the effect of the composite use of Cr and Ni is more remarkable, proves by experiment, and when (Cr+Ni-Mo) is less than 34.4%, the material corrosion resistance obtained is poor, and intensity is little; When (Cr+Ni-Mo) is greater than 37.0%, cause plasticity and the toughness decline of material. Therefore, from the intensity and the erosion resistance that improve material, (Cr+Ni-Mo) should control more than 34.4%, and from the plasticity and the toughness that improve material, (Cr+Ni-Mo) should control below 37.0%.

(4) (Nb/Ti) of formula is the factor of the strength and stability affecting material, is limited in the present invention within the scope of 0.8%-1.6%. Proving by experiment, when (Nb/Ti) is less than 0.8%, the strength of materials obtained is little, and less stable, and when (Nb/Ti) is greater than 1.6%, the manufacturing process of material is complicated, uneconomical. Therefore, from the strength and stability improving material, (Nb/Ti) should control more than 0.8%, and the manufacturing process of formed material of conforming to the principle of simplicity is set out, and (Nb/Ti) should control below 1.6%.

(5) (Ca+Sn+Re) of formula is the factor of intensity and the cleanliness factor affecting material, is limited in the present invention within the scope of 0.25%-0.45%. Proving by experiment, when (Ca+Sn+Re) is less than 0.25%, the strength of materials obtained is little, and cleanliness factor is poor, and when (Ca+Sn+Re) is greater than 0.45%, the manufacturing process of material is complicated, uneconomical. Therefore, from the intensity and the cleanliness factor that improve material, (Ca+Sn+Re) should control more than 0.25%, and the manufacturing process of formed material of conforming to the principle of simplicity is set out, and (Ca+Sn+Re) should control below 0.45%.

Another object of the present invention is achieved through the following technical solutions: the preparation method of a kind of high clean environmental protection stainless steel coffee pot material, comprises the steps:

A, vacuum induction are smelted: carry out vacuum induction smelting according to the proportioning of above-mentioned chemical composition under 0.5-2.5Pa vacuum tightness through vacuum induction furnace, be cast into consumable electrode;

B, vacuum consumable remelting: by the consumable electrode after casting under 0.1-0.5Pa vacuum tightness, carry out vacuum consumable remelting with the molten speed of 1.5-3.5Kg/min, obtain molten steel;

C, Homogenization Treatments: the molten steel after remelting carries out Homogenization Treatments at 1080-1120 DEG C of temperature, and the treatment time is 32-40h;

D forging is become a useful person: the molten steel after Homogenization Treatments is carried out alloy forging, opens forging temperature and is 980-1020 DEG C, and final forging temperature is 820-860 DEG C, obtains forging rod;

E, solution treatment: the forging rod after forging is carried out solution treatment at 1000-1040 DEG C of temperature, and the treatment time is 2-3h, and then oil is chilled to room temperature, obtains steel;

F, thermal treatment: the steel after solution treatment are heat-treated, obtained high clean environmental protection stainless steel coffee pot material.

Vacuum induction furnace smelting tool has the following advantages: the alloy of smelting is pure, performance level height; The steel and the alloy gas content that melt out are low; Metal is not oxidizable; Material purity height; Can accurately adjust and control chemical composition; The intensity of steel can be improved, and reduce the production cost of high-strength stainless steel finished product.

Homogenization Treatments, as the means improving the metallurgical quality of ingot base and extrusion performance, has become the most important method of the metallurgical quality that improves ingot base at present. Homogenization Treatments utilizes to carry out long-time heating at high temperature, inner chemical composition is fully spread, is therefore also called diffusion annealing. The object of annealing is to eliminate tissue defects, improves tissue and makes homogenization of composition and crystal grain thinning, it is to increase the mechanical property of steel, reduces unrelieved stress, can improve hardness, it is to increase plasticity and toughness simultaneously, improve machinability.

Solution treatment refers to that alloy is heated to high temperature single phase region constant temperature to be kept, and cooling fast after making surplus fully be dissolved in sosoloid mutually, to obtain the thermal treatment process of supersaturated solid solution. The effect of solution treatment mainly improves the intensity of steel and alloy, plasticity and toughness; Various phase in alloy is fully dissolved, Intensive intervention body, and improve toughness and etch resistant properties, eliminate stress with softening, to continue processing or shaping.

Thermal treatment refers to that alloy workpiece is through solution treatment, cold plastic deformation or casting, after forging, its performance is kept, shape, the thermal treatment process of size time to time change in the placement of higher temperature or room temperature, the object of ageing treatment, eliminating the internal stress of workpiece, stabilizing tissue and size, improve mechanical property etc.

Preferably, in described steps A, the processing step that vacuum induction is smelted is specially:

A1, proportioning according to above-mentioned chemical composition, first load crucible by C, is then loaded by all the other elements except Cr, Mn, put into vacuum induction furnace, crucible is preheated to 450-550 DEG C, vacuum induction furnace is evacuated to 0.5-2.5Pa, melt with the burn-off rate of 6-8Kg/min;

First add C to measure for the C that C-O reaction provides sufficient, thus be conducive to the gas purging such as N, O; Being easy to be combined with N due to Cr, the removal being unfavorable in melt N, therefore Metal Cr must all reserve, and adds after N is qualified; Owing to metal M n easily volatilizees, therefore Metal Cr must all reserve, and coming out of the stove, first few minutes adds.

A2, material to be added carry out refining with the temperature of 1480-1520 DEG C after all melting, and keep 50-70min;

Liquid level fusion keeps calmness to no longer include bubble when overflowing, and after namely entirely molten, carries out refining. The temperature of refining is more high, and refining time is more long, and degasifying effect is more good, and in melt, gas content is more low. But temperature is too high or overlong time, aggravating crucible oxygen supply reaction, make oxygen content in steel increase on the contrary, the temperature of this time refining controls at 1480-1540 DEG C, and the hold-time controls at 50-70min.

A3, add Cr according to the proportioning of above-mentioned chemical composition, continue to melt with the burn-off rate of 6-8Kg/min;

Being easy to be combined with N due to Cr, the removal being unfavorable in melt N, therefore Metal Cr must all reserve, and adds after N is qualified; Owing to this stage Cr add-on is more, it is possible to bring more N into, therefore this stage needs to be melted at a slow speed by Cr, thus N is got rid of as much as possible.

A4, until Cr melt after, again carry out refining with the temperature of 1480-1520 DEG C, refining time is controlled to 10-20min;

Liquid level fusion keeps calmness to no longer include bubble when overflowing, and after namely entirely molten, carries out refining. The temperature of refining is more high, and refining time is more long, and degasifying effect is more good, and in melt, gas content is more low. But temperature is too high or overlong time, aggravating crucible oxygen supply reaction, make oxygen content in steel increase on the contrary, the temperature of this time refining controls at 1480-1540 DEG C, and the hold-time controls at 10-20min.

A5, add Mn according to the proportioning of above-mentioned chemical composition, under 1500-2000r/min rotating speed, stir 1-3min, after Mn melts, be cast into consumable electrode.

Mn volatilizees very big in vacuum induction is smelted, and therefore metal M n must all reserve, and coming out of the stove, first few minutes adds.

Preferably, in described step F, process of thermal treatment step is specially:

F1, at 1000-1040 DEG C of temperature, the steel after solution treatment being incubated 40-80min, oil is chilled to room temperature;

F2, step F 1 is cooled after steel deepfreeze 40-80min at-100��-140 DEG C of temperature;

F3, at 600-640 DEG C of temperature, the steel after step F 2 deepfreeze being incubated 4-8h, sky is chilled to room temperature;

F4, step F 3 is cooled after steel at 900-940 DEG C of temperature, be incubated 5-15min, water-cooled or oil are chilled to room temperature;

F5, step F 4 is cooled after steel at 360-400 DEG C of temperature, be incubated 1-3h, sky is chilled to room temperature, obtained high clean environmental protection stainless steel coffee pot material.

A kind of high clean environmental protection stainless steel coffee pot, described stainless steel coffee pot obtains through cast molding and surface treatment according to high clean environmental protection stainless steel coffee pot material described above; The processing step of described surface treatment is specially:

(1) pre-treatment: first with sand papering stainless steel coffee pot, then carry out oil removal treatment, then the degreasing fluid of residual is removed in washing; Described oil removal treatment be temperature be 60-70 DEG C degreasing fluid in oil removing 8-12min, often liter of degreasing fluid is made up of following raw material: sodium hydroxide 30-40g, sodium carbonate 20-30g, sodium phosphate 15-25g, iso-octyl sodium sulfate 2-4g, deionized water surplus;

(2) pickling membrane removal: wash after pretreated for step (1) stainless steel coffee pot is at room temperature adopted nitration mixture pickling 3-5min; Often liter of degreasing fluid is made up of following raw material: sulfuric acid 60-100mL, hydrochloric acid 60-100mL, ethanol 60-100mL, water glass 2-4g, deionized water surplus;

(3) surface active: being activate 10-20s in the sulphuric acid soln of 6-10% in mass concentration by the stainless steel coffee pot after step (2) process, activation temperature is 60-70 DEG C; At room temperature clean 2-4min by ultrasonic wave after activation, remove the corrosion product of specimen surface; Ultrasonic cleaning solution used is made up of following raw material: dilute hydrochloric acid 30-40mL, sodium lauryl sulphate 35-45mg, deionized water surplus;

(4) rinse oven dry: the stainless steel coffee pot after step (3) being processed is first clean by cold water flush, then dries at 100-120 DEG C of temperature, cooling, obtain high clean environmental protection stainless steel coffee pot.

The useful effect of the present invention is: the high clean environmental protection stainless steel coffee pot material of the present invention adds Ca, Sn and Re element, can significantly improve intensity and the cleanliness factor of material; Also reduce the production cost of material, and non-renewable Ni resource can be saved, belong to ep-type material.

The high clean environmental protection stainless steel coffee pot material of the present invention, compares with traditional analogous material, the tensile strength >=780Mpa of the stainless steel coffee pot material of the present invention, yield strength >=670Mpa; Impelling strength >=180J, fracture toughness property >=120J, elongation at break >=32%, hardness >=52HRC, also has excellent corrosion resistance nature: the corrosion speed >=0.0118mm/ of material under 3.5%NaCl solution environmental, at 5%H₂S0₄Corrosion speed >=the 0.0376mm/ of material under solution environmental, good over-all properties, is convenient to processing, environmental protection.

The high clean environmental protection stainless steel coffee pot material of the present invention, its chemical composition comprises C, N, Si, Mn, Cr, Ni, Mo, Nb, Ti, Ca, Sn and Re, surplus is iron and impurity, by strictly controlling the content of often kind of element, make material have higher cleanliness factor, 4h to the antibiotic rate of intestinal bacteria up to more than 85%, environmental protection, and also there is higher intensity, toughness, hardness, wear resistance, thermotolerance and erosion resistance, excellent combination property.

The preparation method of the present invention adopts the steps such as vacuum induction smelting, Homogenization Treatments, solution treatment and thermal treatment, all can improve the intensity of steel, and reduce the production cost of high-strength stainless steel finished product, and have good plasticity, meet the needs of deformation processing.

The preparation method of the present invention and the material-mix of the present invention use, it is possible to play the optimum performance of material, and technique is simple, and convenient operation and control, steady quality, production efficiency height, production environmental protection, can large-scale industrial production.

Embodiment

For the ease of the understanding of those skilled in the art, below in conjunction with embodiment, the present invention is further illustrated, and the content that enforcement mode is mentioned is limitation of the invention not.

Embodiment 1

A kind of high clean environmental protection stainless steel coffee pot material, its chemical composition comprises the element of following weight percent: C:0.16%, N:0.41%, Si:0.6%, Mn:1.6%, Cr:25%, Ni:15%, Mo:4.5%, Nb:1.2%, Ti:1.5%, Ca:0.2%, Sn:0.05%, Re:0.008%, surplus are iron and impurity; By weight percentage, total content��0.1% of described impurity, wherein, P��0.015%, S��0.008%, H��0.003%, O��0.001%.

The chemical composition of described material also comprises the rare earth element of following weight percent: La:0.008%, Sc:0.004% and Nd:0.001%.

A preparation method for high clean environmental protection stainless steel coffee pot material, comprises the steps:

A, vacuum induction are smelted: carry out vacuum induction smelting according to the proportioning of above-mentioned chemical composition under 0.5Pa vacuum tightness through vacuum induction furnace, be cast into consumable electrode;

B, vacuum consumable remelting: by the consumable electrode after casting under 0.1Pa vacuum tightness, carry out vacuum consumable remelting with the molten speed of 1.5Kg/min, obtain molten steel;

C, Homogenization Treatments: the molten steel after remelting carries out Homogenization Treatments at 1080 DEG C of temperature, and the treatment time is 40h;

D forging is become a useful person: the molten steel after Homogenization Treatments is carried out alloy forging, and opening forging temperature is 980 DEG C, and final forging temperature is 820 DEG C, obtains forging rod;

E, solution treatment: the forging rod after forging is carried out solution treatment at 1000 DEG C of temperature, and the treatment time is 3h, and then oil is chilled to room temperature, obtains steel;

In described steps A, the processing step that vacuum induction is smelted is specially:

A1, proportioning according to above-mentioned chemical composition, first load crucible by C, is then loaded by all the other elements except Cr, Mn, put into vacuum induction furnace, crucible is preheated to 450 DEG C, vacuum induction furnace is evacuated to 0.5Pa, melt with the burn-off rate of 6Kg/min;

A2, material to be added carry out refining with the temperature of 1480 DEG C after all melting, and keep 70min;

A3, add Cr according to the proportioning of above-mentioned chemical composition, continue to melt with the burn-off rate of 6Kg/min;

A4, until Cr melt after, again carry out refining with the temperature of 1480 DEG C, refining time is controlled to 20min;

A5, add Mn according to the proportioning of above-mentioned chemical composition, under 1500r/min rotating speed, stir 3min, after Mn melts, be cast into consumable electrode.

In described step F, process of thermal treatment step is specially:

F1, at 1000 DEG C of temperature, the steel after solution treatment being incubated 80min, oil is chilled to room temperature;

F2, step F 1 is cooled after steel deepfreeze 80min at-100 DEG C of temperature;

F3, at 600 DEG C of temperature, the steel after step F 2 deepfreeze being incubated 8h, sky is chilled to room temperature;

F4, step F 3 is cooled after steel at 900 DEG C of temperature, be incubated 15min, water-cooled or oil are chilled to room temperature;

F5, step F 4 is cooled after steel at 360 DEG C of temperature, be incubated 3h, sky is chilled to room temperature, obtained high clean environmental protection stainless steel coffee pot material.

(1) pre-treatment: first with sand papering stainless steel coffee pot, then carry out oil removal treatment, then the degreasing fluid of residual is removed in washing; Described oil removal treatment be temperature be 70 DEG C degreasing fluid in oil removing 12min, often liter of degreasing fluid is made up of following raw material: sodium hydroxide 30g, sodium carbonate 20g, sodium phosphate 15g, iso-octyl sodium sulfate 2g, deionized water surplus;

(2) pickling membrane removal: wash after pretreated for step (1) stainless steel coffee pot is at room temperature adopted nitration mixture pickling 3min; Often liter of degreasing fluid is made up of following raw material: sulfuric acid 60mL, hydrochloric acid 60mL, ethanol 60mL, water glass 2g, deionized water surplus;

(3) surface active: being activate 20s in the sulphuric acid soln of 6% in mass concentration by the stainless steel coffee pot after step (2) process, activation temperature is 60 DEG C; At room temperature clean 2min by ultrasonic wave after activation, remove the corrosion product of specimen surface; Ultrasonic cleaning solution used is made up of following raw material: dilute hydrochloric acid 30mL, sodium lauryl sulphate 35mg, deionized water surplus;

(4) rinse oven dry: the stainless steel coffee pot after step (3) being processed is first clean by cold water flush, then dries at 100 DEG C of temperature, cooling, obtain high clean environmental protection stainless steel coffee pot.

Embodiment 2

A kind of high clean environmental protection stainless steel coffee pot material, its chemical composition comprises the element of following weight percent: C:0.17%, N:0.40%, Si:0.7%, Mn:1.5%, Cr:25.5%, Ni:14.5%, Mo:4.4%, Nb:1.3%, Ti:1.6%, Ca:0.25%, Sn:0.04%, Re:0.007%, surplus are iron and impurity; By weight percentage, total content��0.1% of described impurity, wherein, P��0.015%, S��0.008%, H��0.003%, O��0.001%.

The chemical composition of described material also comprises the rare earth element of following weight percent: La:0.009%, Sc:0.005% and Nd:0.002%.

A, vacuum induction are smelted: carry out vacuum induction smelting according to the proportioning of above-mentioned chemical composition under 1.0Pa vacuum tightness through vacuum induction furnace, be cast into consumable electrode;

B, vacuum consumable remelting: by the consumable electrode after casting under 0.2Pa vacuum tightness, carry out vacuum consumable remelting with the molten speed of 2.0Kg/min, obtain molten steel;

C, Homogenization Treatments: the molten steel after remelting carries out Homogenization Treatments at 1090 DEG C of temperature, and the treatment time is 38h;

D forging is become a useful person: the molten steel after Homogenization Treatments is carried out alloy forging, and opening forging temperature is 990 DEG C, and final forging temperature is 830 DEG C, obtains forging rod;

E, solution treatment: the forging rod after forging is carried out solution treatment at 1010 DEG C of temperature, and the treatment time is 2.8h, and then oil is chilled to room temperature, obtains steel;

A1, proportioning according to above-mentioned chemical composition, first load crucible by C, is then loaded by all the other elements except Cr, Mn, put into vacuum induction furnace, crucible is preheated to 480 DEG C, vacuum induction furnace is evacuated to 1.0Pa, melt with the burn-off rate of 6.5Kg/min;

A2, material to be added carry out refining with the temperature of 1490 DEG C after all melting, and keep 65min;

A3, add Cr according to the proportioning of above-mentioned chemical composition, continue to melt with the burn-off rate of 6.5Kg/min;

A4, until Cr melt after, again carry out refining with the temperature of 1490 DEG C, refining time is controlled to 18min;

A5, add Mn according to the proportioning of above-mentioned chemical composition, under 1600r/min rotating speed, stir 2.5min, after Mn melts, be cast into consumable electrode.

In described step F, process of thermal treatment step is specially:

F1, at 1010 DEG C of temperature, the steel after solution treatment being incubated 70min, oil is chilled to room temperature;

F2, step F 1 is cooled after steel deepfreeze 70min at-110 DEG C of temperature;

F3, at 610 DEG C of temperature, the steel after step F 2 deepfreeze being incubated 7h, sky is chilled to room temperature;

F4, step F 3 is cooled after steel at 910 DEG C of temperature, be incubated 12min, water-cooled or oil are chilled to room temperature;

F5, step F 4 is cooled after steel at 370 DEG C of temperature, be incubated 2.5h, sky is chilled to room temperature, obtained high clean environmental protection stainless steel coffee pot material.

(1) pre-treatment: first with sand papering stainless steel coffee pot, then carry out oil removal treatment, then the degreasing fluid of residual is removed in washing; Described oil removal treatment be temperature be 62 DEG C degreasing fluid in oil removing 11min, often liter of degreasing fluid is made up of following raw material: sodium hydroxide 32g, sodium carbonate 22g, sodium phosphate 18g, iso-octyl sodium sulfate 2.5g, deionized water surplus;

(2) pickling membrane removal: wash after pretreated for step (1) stainless steel coffee pot is at room temperature adopted nitration mixture pickling 3.5min; Often liter of degreasing fluid is made up of following raw material: sulfuric acid 70mL, hydrochloric acid 70mL, ethanol 70mL, water glass 2.5g, deionized water surplus;

(3) surface active: being activate 18s in the sulphuric acid soln of 7% in mass concentration by the stainless steel coffee pot after step (2) process, activation temperature is 62 DEG C; At room temperature clean 2.5min by ultrasonic wave after activation, remove the corrosion product of specimen surface; Ultrasonic cleaning solution used is made up of following raw material: dilute hydrochloric acid 32mL, sodium lauryl sulphate 38mg, deionized water surplus;

(4) rinse oven dry: the stainless steel coffee pot after step (3) being processed is first clean by cold water flush, then dries at 105 DEG C of temperature, cooling, obtain high clean environmental protection stainless steel coffee pot.

Embodiment 3

A kind of high clean environmental protection stainless steel coffee pot material, its chemical composition comprises the element of following weight percent: C:0.18%, N:0.39%, Si:0.8%, Mn:1.4%, Cr:26%, Ni:14%, Mo:4.3%, Nb:1.4%, Ti:1.7%, Ca:0.3%, Sn:0.03%, Re:0.006%, surplus are iron and impurity; By weight percentage, total content��0.1% of described impurity, wherein, P��0.015%, S��0.008%, H��0.003%, O��0.001%.

The chemical composition of described material also comprises the rare earth element of following weight percent: La:0.01%, Sc:0.006% and Nd:0.003%.

A, vacuum induction are smelted: carry out vacuum induction smelting according to the proportioning of above-mentioned chemical composition under 1.5Pa vacuum tightness through vacuum induction furnace, be cast into consumable electrode;

B, vacuum consumable remelting: by the consumable electrode after casting under 0.3Pa vacuum tightness, carry out vacuum consumable remelting with the molten speed of 2.5Kg/min, obtain molten steel;

C, Homogenization Treatments: the molten steel after remelting carries out Homogenization Treatments at 1100 DEG C of temperature, and the treatment time is 36h;

D forging is become a useful person: the molten steel after Homogenization Treatments is carried out alloy forging, and opening forging temperature is 1000 DEG C, and final forging temperature is 840 DEG C, obtains forging rod;

E, solution treatment: the forging rod after forging is carried out solution treatment at 1020 DEG C of temperature, and the treatment time is 2.5h, and then oil is chilled to room temperature, obtains steel;

A1, proportioning according to above-mentioned chemical composition, first load crucible by C, is then loaded by all the other elements except Cr, Mn, put into vacuum induction furnace, crucible is preheated to 500 DEG C, vacuum induction furnace is evacuated to 1.5Pa, melt with the burn-off rate of 7Kg/min;

A2, material to be added carry out refining with the temperature of 1500 DEG C after all melting, and keep 60min;

A3, add Cr according to the proportioning of above-mentioned chemical composition, continue to melt with the burn-off rate of 7Kg/min;

A4, until Cr melt after, again carry out refining with the temperature of 1500 DEG C, refining time is controlled to 15min;

A5, add Mn according to the proportioning of above-mentioned chemical composition, under 1800r/min rotating speed, stir 2min, after Mn melts, be cast into consumable electrode.

In described step F, process of thermal treatment step is specially:

F1, at 1020 DEG C of temperature, the steel after solution treatment being incubated 60min, oil is chilled to room temperature;

F2, step F 1 is cooled after steel deepfreeze 60min at-120 DEG C of temperature;

F3, at 620 DEG C of temperature, the steel after step F 2 deepfreeze being incubated 6h, sky is chilled to room temperature;

F4, step F 3 is cooled after steel at 920 DEG C of temperature, be incubated 10min, water-cooled or oil are chilled to room temperature;

F5, step F 4 is cooled after steel at 380 DEG C of temperature, be incubated 2h, sky is chilled to room temperature, obtained high clean environmental protection stainless steel coffee pot material.

(1) pre-treatment: first with sand papering stainless steel coffee pot, then carry out oil removal treatment, then the degreasing fluid of residual is removed in washing; Described oil removal treatment be temperature be 65 DEG C degreasing fluid in oil removing 10min, often liter of degreasing fluid is made up of following raw material: sodium hydroxide 35g, sodium carbonate 25g, sodium phosphate 20g, iso-octyl sodium sulfate 3g, deionized water surplus;

(2) pickling membrane removal: wash after pretreated for step (1) stainless steel coffee pot is at room temperature adopted nitration mixture pickling 4min; Often liter of degreasing fluid is made up of following raw material: sulfuric acid 80mL, hydrochloric acid 80mL, ethanol 80mL, water glass 3g, deionized water surplus;

(3) surface active: being activate 15s in the sulphuric acid soln of 8% in mass concentration by the stainless steel coffee pot after step (2) process, activation temperature is 65 DEG C; At room temperature clean 3min by ultrasonic wave after activation, remove the corrosion product of specimen surface; Ultrasonic cleaning solution used is made up of following raw material: dilute hydrochloric acid 35mL, sodium lauryl sulphate 40mg, deionized water surplus;

(4) rinse oven dry: the stainless steel coffee pot after step (3) being processed is first clean by cold water flush, then dries at 110 DEG C of temperature, cooling, obtain high clean environmental protection stainless steel coffee pot.

Embodiment 4

A kind of high clean environmental protection stainless steel coffee pot material, its chemical composition comprises the element of following weight percent: C:0.19%, N:0.38%, Si:0.9%, Mn:1.3%, Cr:26.5%, Ni:13.5%, Mo:4.2%, Nb:1.5%, Ti:1.8%, Ca:0.35%, Sn:0.02%, Re:0.005%, surplus are iron and impurity; By weight percentage, total content��0.1% of described impurity, wherein, P��0.015%, S��0.008%, H��0.003%, O��0.001%.

The chemical composition of described material also comprises the rare earth element of following weight percent: La:0.011%, Sc:0.007% and Nd:0.004%.

A, vacuum induction are smelted: carry out vacuum induction smelting according to the proportioning of above-mentioned chemical composition under 2.0Pa vacuum tightness through vacuum induction furnace, be cast into consumable electrode;

B, vacuum consumable remelting: by the consumable electrode after casting under 0.4Pa vacuum tightness, carry out vacuum consumable remelting with the molten speed of 3.0Kg/min, obtain molten steel;

C, Homogenization Treatments: the molten steel after remelting carries out Homogenization Treatments at 1110 DEG C of temperature, and the treatment time is 34h;

D forging is become a useful person: the molten steel after Homogenization Treatments is carried out alloy forging, and opening forging temperature is 1010 DEG C, and final forging temperature is 850 DEG C, obtains forging rod;

E, solution treatment: the forging rod after forging is carried out solution treatment at 1030 DEG C of temperature, and the treatment time is 2.2h, and then oil is chilled to room temperature, obtains steel;

A1, proportioning according to above-mentioned chemical composition, first load crucible by C, is then loaded by all the other elements except Cr, Mn, put into vacuum induction furnace, crucible is preheated to 520 DEG C, vacuum induction furnace is evacuated to 2.0Pa, melt with the burn-off rate of 7.5Kg/min;

A2, material to be added carry out refining with the temperature of 1510 DEG C after all melting, and keep 65min;

A3, add Cr according to the proportioning of above-mentioned chemical composition, continue to melt with the burn-off rate of 7.5Kg/min;

A4, until Cr melt after, again carry out refining with the temperature of 1510 DEG C, refining time is controlled to 12min;

A5, add Mn according to the proportioning of above-mentioned chemical composition, under 1900r/min rotating speed, stir 1.5min, after Mn melts, be cast into consumable electrode.

In described step F, process of thermal treatment step is specially:

F1, at 1030 DEG C of temperature, the steel after solution treatment being incubated 50min, oil is chilled to room temperature;

F2, step F 1 is cooled after steel deepfreeze 50min at-130 DEG C of temperature;

F3, at 630 DEG C of temperature, the steel after step F 2 deepfreeze being incubated 5h, sky is chilled to room temperature;

F4, step F 3 is cooled after steel at 930 DEG C of temperature, be incubated 8min, water-cooled or oil are chilled to room temperature;

F5, step F 4 is cooled after steel at 390 DEG C of temperature, be incubated 1.5h, sky is chilled to room temperature, obtained high clean environmental protection stainless steel coffee pot material.

(1) pre-treatment: first with sand papering stainless steel coffee pot, then carry out oil removal treatment, then the degreasing fluid of residual is removed in washing; Described oil removal treatment be temperature be 68 DEG C degreasing fluid in oil removing 9min, often liter of degreasing fluid is made up of following raw material: sodium hydroxide 38g, sodium carbonate 28g, sodium phosphate 22g, iso-octyl sodium sulfate 3.5g, deionized water surplus;

(2) pickling membrane removal: wash after pretreated for step (1) stainless steel coffee pot is at room temperature adopted nitration mixture pickling 4.5min; Often liter of degreasing fluid is made up of following raw material: sulfuric acid 90mL, hydrochloric acid 90mL, ethanol 90mL, water glass 3.5g, deionized water surplus;

(3) surface active: being activate 12s in the sulphuric acid soln of 9% in mass concentration by the stainless steel coffee pot after step (2) process, activation temperature is 68 DEG C; At room temperature clean 3.5min by ultrasonic wave after activation, remove the corrosion product of specimen surface; Ultrasonic cleaning solution used is made up of following raw material: dilute hydrochloric acid 38mL, sodium lauryl sulphate 42mg, deionized water surplus;

(4) rinse oven dry: the stainless steel coffee pot after step (3) being processed is first clean by cold water flush, then dries at 115 DEG C of temperature, cooling, obtain high clean environmental protection stainless steel coffee pot.

Embodiment 5

A kind of high clean environmental protection stainless steel coffee pot material, its chemical composition comprises the element of following weight percent: C:0.20%, N:0.37%, Si:1.0%, Mn:1.2%, Cr:27%, Ni:13%, Mo:4.1%, Nb:1.6%, Ti:1.9%, Ca:0.4%, Sn:0.01%, Re:0.004%, surplus are iron and impurity; By weight percentage, total content��0.1% of described impurity, wherein, P��0.015%, S��0.008%, H��0.003%, O��0.001%.

The chemical composition of described material also comprises the rare earth element of following weight percent: La:0.012%, Sc:0.008% and Nd:0.005%.

A, vacuum induction are smelted: carry out vacuum induction smelting according to the proportioning of above-mentioned chemical composition under 2.5Pa vacuum tightness through vacuum induction furnace, be cast into consumable electrode;

B, vacuum consumable remelting: by the consumable electrode after casting under 0.5Pa vacuum tightness, carry out vacuum consumable remelting with the molten speed of 3.5Kg/min, obtain molten steel;

C, Homogenization Treatments: the molten steel after remelting carries out Homogenization Treatments at 1120 DEG C of temperature, and the treatment time is 32h;

D forging is become a useful person: the molten steel after Homogenization Treatments is carried out alloy forging, and opening forging temperature is 1020 DEG C, and final forging temperature is 860 DEG C, obtains forging rod;

E, solution treatment: the forging rod after forging is carried out solution treatment at 1040 DEG C of temperature, and the treatment time is 2h, and then oil is chilled to room temperature, obtains steel;

A1, proportioning according to above-mentioned chemical composition, first load crucible by C, is then loaded by all the other elements except Cr, Mn, put into vacuum induction furnace, crucible is preheated to 550 DEG C, vacuum induction furnace is evacuated to 2.5Pa, melt with the burn-off rate of 8Kg/min;

A2, material to be added carry out refining with the temperature of 1520 DEG C after all melting, and keep 50min;

A3, add Cr according to the proportioning of above-mentioned chemical composition, continue to melt with the burn-off rate of 8Kg/min;

A4, until Cr melt after, again carry out refining with the temperature of 1520 DEG C, refining time is controlled to 10min;

A5, add Mn according to the proportioning of above-mentioned chemical composition, under 2000r/min rotating speed, stir 1min, after Mn melts, be cast into consumable electrode.

In described step F, process of thermal treatment step is specially:

F1, at 1040 DEG C of temperature, the steel after solution treatment being incubated 40min, oil is chilled to room temperature;

F2, step F 1 is cooled after steel deepfreeze 40min at-140 DEG C of temperature;

F3, at 640 DEG C of temperature, the steel after step F 2 deepfreeze being incubated 4h, sky is chilled to room temperature;

F4, step F 3 is cooled after steel at 940 DEG C of temperature, be incubated 5min, water-cooled or oil are chilled to room temperature;

F5, step F 4 is cooled after steel at 400 DEG C of temperature, be incubated 1h, sky is chilled to room temperature, obtained high clean environmental protection stainless steel coffee pot material.

(1) pre-treatment: first with sand papering stainless steel coffee pot, then carry out oil removal treatment, then the degreasing fluid of residual is removed in washing; Described oil removal treatment be temperature be 70 DEG C degreasing fluid in oil removing 8min, often liter of degreasing fluid is made up of following raw material: sodium hydroxide 40g, sodium carbonate 30g, sodium phosphate 25g, iso-octyl sodium sulfate 4g, deionized water surplus;

(2) pickling membrane removal: wash after pretreated for step (1) stainless steel coffee pot is at room temperature adopted nitration mixture pickling 5min; Often liter of degreasing fluid is made up of following raw material: sulfuric acid 100mL, hydrochloric acid 100mL, ethanol 100mL, water glass 4g, deionized water surplus;

(3) surface active: being activate 10s in the sulphuric acid soln of 10% in mass concentration by the stainless steel coffee pot after step (2) process, activation temperature is 70 DEG C; At room temperature clean 4min by ultrasonic wave after activation, remove the corrosion product of specimen surface; Ultrasonic cleaning solution used is made up of following raw material: dilute hydrochloric acid 40mL, sodium lauryl sulphate 45mg, deionized water surplus;

(4) rinse oven dry: the stainless steel coffee pot after step (3) being processed is first clean by cold water flush, then dries at 120 DEG C of temperature, cooling, obtain high clean environmental protection stainless steel coffee pot.

The mechanical and physical performance of the high clean environmental protection stainless steel coffee pot material that embodiment 1-5 is obtained is as shown in table 1.

Table 1

Above-described embodiment is the present invention's preferably implementation, and in addition, the present invention can also realize by alternate manner, and any apparent replacement is all within protection scope of the present invention without departing from the inventive concept of the premise.

Claims

1. one kind high clean environmental protection stainless steel coffee pot material, it is characterised in that: its chemical composition comprises the element of following weight percent: C:0.16-0.20%, N:0.37-0.41%, Si:0.6-1.0%, Mn:1.2-1.6%, Cr:25-27%, Ni:13-15%, Mo:4.1-4.5%, Nb:1.2-1.6%, Ti:1.5-1.9%, Ca:0.2-0.4%, Sn:0.01-0.05%, Re:0.004-0.008%, surplus are iron and impurity.

2. a kind of high clean environmental protection stainless steel coffee pot material according to claim 1, it is characterised in that: its chemical composition comprises the element of following weight percent: C:0.17-0.19%, N:0.38-0.40%, Si:0.7-0.9%, Mn:1.3-1.5%, Cr:25.5-26.5%, Ni:13.5-14.5%, Mo:4.2-4.4%, Nb:1.3-1.5%, Ti:1.6-1.8%, Ca:0.25-0.35%, Sn:0.02-0.04%, Re:0.005-0.007%, surplus are iron and impurity.

3. a kind of high clean environmental protection stainless steel coffee pot material according to claim 1, it is characterised in that: its chemical composition comprises the element of following weight percent: C:0.18%, N:0.39%, Si:0.8%, Mn:1.4%, Cr:26%, Ni:14%, Mo:4.3%, Nb:1.4%, Ti:1.7%, Ca:0.3%, Sn:0.03%, Re:0.006%, surplus are iron and impurity.

4. a kind of high clean environmental protection stainless steel coffee pot material according to claim 1, it is characterised in that: by weight percentage, total content��0.1% of described impurity, wherein, P��0.015%, S��0.008%, H��0.003%, O��0.001%.

5. a kind of high clean environmental protection stainless steel coffee pot material according to claim 1, it is characterised in that: the chemical composition of described material also comprises the rare earth element of following weight percent: La:0.008-0.012%, Sc:0.004-0.008% and Nd:0.001-0.005%.

6. a kind of high clean environmental protection stainless steel coffee pot material according to claim 1, it is characterised in that: the chemical composition of described material meets following formula:

0.55%��C+N��0.60% ... (1)

2.0%��Si+Mn��2.4% ... (2)

34.4��Cr+Ni-Mo��37.0% ... (3)

0.8%��Nb/Ti��1.6% ... (4)

0.25%��Ca+Sn+Re��0.45% ... (5)

7. the preparation method of a kind of high clean environmental protection stainless steel coffee pot material as described in item as arbitrary in claim 1-6, it is characterised in that: comprise the steps:

8. the preparation method of a kind of high clean environmental protection stainless steel coffee pot material according to claim 7, it is characterised in that: in described steps A, the processing step that vacuum induction is smelted is specially:

9. the preparation method of a kind of high clean environmental protection stainless steel coffee pot material according to claim 7, it is characterised in that: in described step F, process of thermal treatment step is specially:

10. one kind high clean environmental protection stainless steel coffee pot, it is characterised in that: the high clean environmental protection stainless steel coffee pot material of described stainless steel coffee pot according to the arbitrary item of claim 1-6 obtains through cast molding and surface treatment; The processing step of described surface treatment is specially: