CN112122824B - Gas shield welding stainless steel welding wire with high hardness and strong acid corrosion resistance as well as preparation method and application thereof - Google Patents
Gas shield welding stainless steel welding wire with high hardness and strong acid corrosion resistance as well as preparation method and application thereof Download PDFInfo
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- CN112122824B CN112122824B CN202011058961.XA CN202011058961A CN112122824B CN 112122824 B CN112122824 B CN 112122824B CN 202011058961 A CN202011058961 A CN 202011058961A CN 112122824 B CN112122824 B CN 112122824B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/24—Selection of soldering or welding materials proper
- B23K35/30—Selection of soldering or welding materials proper with the principal constituent melting at less than 1550 degrees C
- B23K35/3053—Fe as the principal constituent
- B23K35/308—Fe as the principal constituent with Cr as next major constituent
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/16—Arc welding or cutting making use of shielding gas
- B23K9/167—Arc welding or cutting making use of shielding gas and of a non-consumable electrode
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/32—Accessories
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Abstract
The invention discloses a gas shield welding stainless steel welding wire with high hardness and strong acid corrosion resistance, a preparation method and application thereof, wherein the welding wire comprises the following elements in percentage by mass: less than or equal to 0.03 percent of C, 0.6-1.5 percent of Mn, 0.5-1.2 percent of Si, 14.0-19.0 percent of Cr, 4.0-8.0 percent of Ni, 2.0-3.0 percent of Mo, 2.0-5.0 percent of Cu, 0.5-2.5 percent of B, 0.2-0.7 percent of Nb, 0.2-0.5 percent of V, less than or equal to 0.03 percent of S, less than or equal to 0.03 percent of P, and the balance of Fe. The billet of the welding wire is precisely smelted in vacuum and inert gas atmosphere, and the welding wire aims to solve the technical problems that a cladding layer metal is required to have high hardness and strong acid corrosion resistance.
Description
Technical Field
The invention belongs to a welding material in the technical field of welding, and relates to a gas shield welding stainless steel welding wire with high hardness and strong acid corrosion resistance, and a preparation method and application thereof.
Background
A large amount of new hydraulic supports are produced by the coal machine manufacturing industry every year and are placed in a well for service, and meanwhile, a large number of waste hydraulic supports need to be repaired and renovated, wherein the jack part of each hydraulic support is the most important core part of the whole equipment system. The jack part of the hydraulic support consists of an upright post (a plunger), a middle cylinder, an outer cylinder, a sealing ring combination, a guide sleeve and the like. According to the requirements of manufacturing, renovation and service, the outer surfaces of the upright post and the middle cylinder must be modified to meet the comprehensive requirements of high hardness and strong acid corrosion resistance.
The base materials of the jack upright post and the cylinder body of the hydraulic support of the existing domestic coal machine comprise 27SiMn, 30CrMnSi, 40Cr and the like, wherein 27SiMn is most widely adopted. According to the requirements of manufacturing, renovation and service, the outer surfaces of the upright post and the middle cylinder must be modified to meet the comprehensive requirements of high hardness and strong acid corrosion resistance. The traditional outer surface treatment of the upright post and the middle cylinder adopts an electro-chromic technology, and most of related electroplating factories stop working due to serious pollution and severe working environment; in the application mechanism, because the electroplated layer is very thin (0.05-0.1 mm), the combination between the electroplated layer and the matrix is an electrochemical transplanting process, the interface strength is low, the chromium-plated layer also has the problem of porosity, when the chromium-plated layer is impacted by a hard substance, cracks and falling easily occur, and the local maintenance and restoration are difficult.
At present, some coal manufacturing enterprises in China adopt a laser powder deposition technology for deposition processing of the outer surfaces of the upright post and the middle cylinder of the hydraulic support. The laser cladding equipment has large investment, and the maintenance cost of vulnerable parts, consumables and equipment is high; the deposited powder is not sufficientUtilization, photoelectric conversion rate of the laser and absorptivity of the laser are always difficult problems for improvement and improvement of suppliers and application units; the temperature gradient in the laser cladding process is high, and the speed of rapid heating and rapid cooling is as high as 105Segregation and pores of the components of the deposited metal layer can be caused above DEG C/S; the bonding area of the cladding layer and the base material has large internal stress, and is also an actuating factor for generating cracks in the cladding layer.
The hot wire argon tungsten-arc welding deposition technology is adopted, the equipment investment is low, the equipment operation and maintenance are simple, the argon-shielded tungsten electrode welding arc is a diffusion-type free arc, the arc is soft and quiet, the thermal cycle process is slow, the adjustment and control of the heat input quantity of the base metal can be realized by adjusting the conveying quantity of the welding wire, and the welding quality is excellent; the production equipment can be configured with a plurality of groups of welding heads for systematic linkage, and has high production efficiency and good economic benefit. However, some related coal repairing and manufacturing enterprises adopt standard austenitic stainless steel welding wires such as ER308, ER309 and ER316L to match with each other, and the acid corrosion resistance can be ensured, but the hardness value of the cladding layer is low (HRC < 35), and the surface of the cladding layer is easy to be damaged by scratching, smashing and the like, and cannot meet the requirements of repairing and manufacturing processes and service performance.
Flux-cored wire, because the filling rate is uneven, the powder components have segregation, and the melting layer metal has deviation of quality and components; meanwhile, the flux-cored wire has poor rigidity, poor wire feeding performance and poor directivity and follow-up performance, and the front end part of the flux-cored wire in an arc area is easy to burst and splash; the flux-cored wire has strong moisture absorption, the phenomena of flux-cored component deterioration and air holes are easy to occur, and the flux-cored wire cannot be stably applied to the hot wire tungsten electrode argon arc welding process.
Therefore, the invention of the solid stainless steel welding wire with high hardness and strong acid corrosion resistance at the present stage is a technical problem to be solved urgently.
Disclosure of Invention
The invention aims to provide a gas shield welding stainless steel welding wire with high hardness and strong acid corrosion resistance, a preparation method and application thereof, and aims to solve the technical problem that the standard austenitic stainless steel welding wire adopted at the present stage is low in hardness. The welding wire has the advantages of high hardness, strong acid corrosion resistance and strong intermetallic bonding capability.
The welding wire has the dual characteristics of high hardness and strong acid corrosion resistance, is matched with a gas shielded welding process technology, and also has good welding manufacturability, so that the welding wire is particularly suitable for deposition welding repair of the outer surfaces of the upright column and the middle cylinder of the hydraulic support of the coal machine, and the gas shielded welding deposition repair technology of the outer surfaces of the upright column and the middle cylinder of the hydraulic support of the coal machine forms a complete system.
The technical idea of the invention is as follows: the heating characteristic of welding electric arc and the boundary effect of welding thermal cycle are brought into the whole process of chemical metallurgy and physical metallurgy of cladding layer metal, the dilution rate of a base metal to the cladding layer is regulated to 8-10% through a welding cladding process technology, the alloy system of welding wire filler metal, the proportion range of each main component and the control limit amount of harmful impurity elements are set according to the content of C, Mn, Si, S and P conveyed to the cladding layer by a molten base metal part, the raw material standard of a billet used for smelting the welding wire is further determined, the cladding layer metal has an austenite, ferrite and martensite ternary combined structure, the cladding layer metal is cleaned and purified, and the relevant mechanisms of solid solution strengthening, dislocation strengthening, precipitation strengthening and fine grain strengthening are accompanied, so that the welding wire can reach high hardness value and can meet the requirement of strong acid corrosion resistance.
In order to solve the technical problems, the invention adopts the following technical scheme:
designing a gas shielded welding stainless steel welding wire with high hardness and strong acid corrosion resistance, which comprises the following elements in percentage by mass: the material comprises the following elements in percentage by mass: less than or equal to 0.03 percent of C, 0.6-1.5 percent of Mn, 0.5-1.2 percent of Si, 14.0-19.0 percent of Cr, 4.0-8.0 percent of Ni, 2.0-3.0 percent of Mo, 2.0-5.0 percent of Cu, 0.5-2.5 percent of B, 0.2-0.7 percent of Nb, 0.2-0.5 percent of V, less than or equal to 0.03 percent of S, less than or equal to 0.03 percent of P, and the balance of Fe.
Preferably, the material comprises the following elements in percentage by mass: 0.01 to 0.02% of C, 0.8 to 1.2% of Mn, 0.6 to 0.9% of Si, 16.5 to 18.5% of Cr, 5.0 to 6.0% of Ni, 2.5 to 2.8% of Mo, 3.0 to 4.0% of Cu, 1.0 to 2.0% of B, 0.3 to 0.6% of Nb, 0.3 to 0.4% of V, less than or equal to 0.02% of S, less than or equal to 0.025% of P, and the balance of Fe.
Preferably, the raw materials for preparing the welding wire comprise main materials and auxiliary materials; the main material comprises the following raw materials in parts by weight: 45-55 parts of pure iron, 24-28 parts of micro-carbon ferrochrome, 5-6 parts of pure nickel, 2-5 parts of pure copper, 3-5 parts of ferromolybdenum, 5-9 parts of ferroboron, 0.9-1.5 parts of manganese metal, 0.8-1.2 parts of ferrosilicon, 0.4-1.0 part of ferroniobium and 0.3-0.6 part of ferrovanadium.
Preferably, the auxiliary materials comprise the following raw materials in parts by weight: 1.5-2.0 parts of special-grade metallurgical lime and 0.4-0.8 part of fluorite.
Preferably, the welding wire is a solid welding wire with the diameter of 0.6-2.0 mm.
A manufacturing method of a gas shield welding stainless steel welding wire coil with high hardness and strong acid corrosion resistance comprises the following steps:
1) preparing raw materials according to the composition of the stainless steel welding wires of the welding wires;
2) adding auxiliary materials into a furnace, then adding main materials in batches, and keeping the vacuum degree in the furnace at 2-3 Pa, the temperature at 1560-1620 ℃ for 120-130 min during vacuum melting;
3) adding manganese under the protection of inert gas, and completely melting and homogenizing;
4) casting and cooling to form a steel billet; soaking the steel billet at 900-1000 ℃, rolling the steel billet into a wire rod with the diameter of 5.5mm, and rolling the wire rod into a coil.
A method for manufacturing a gas shield welding stainless steel welding wire with high hardness and strong acid corrosion resistance comprises the following steps: the wire rod manufactured by the method sequentially undergoes acid cleaning, coating, rough drawing, coating removal, electrolytic cleaning, bright heat treatment, coating, middle drawing, coating removal, electrolytic cleaning, bright heat treatment, coating, fine drawing, finishing, rolling and finished product packaging.
The application of the welding wire is matched with a gas shielded welding process method and is used for a deposited welding repair process of machine manufacturing and remanufacturing.
Preferably, the welding wire is applied to deposition welding repair of the outer surfaces of the hydraulic support upright post and the middle cylinder.
The principle of the invention is as follows:
cr: chromium is a ferrite (F) forming element and is the metal with the highest hardness in elementary metals, the passivation effect of chromium can prevent the metal of a cladding layer from being corroded by air, and researches show that when the chromium content in the iron-chromium solid solution exceeds 12%, the metal has the stainless property. The properties of the welding wire can be influenced by the systematic factors of the carbonization, oxidation, dilution rate of the base metal and ternary organization combination of chromium;
c: carbon is a strongly stable austenite (a) element, and a certain amount of high-temperature austenite is also a basic condition for generating dislocation martensite (M) hardening; on the other hand, the affinity of carbon and chromium is very high, various forms of chromium carbide can be formed, the precipitation hardening effect is achieved, and meanwhile, the content of free chromium is reduced, and the corrosion resistance of the metal is reduced. Because the locally molten base metal can convey about 0.03% of carbon content to the cladding layer metal, a carbon fixing mode is adopted in design, for example, elements with stronger affinity to carbon than chromium are added to form carbide; on the basis of the expected design of components and structures, the retained austenite formed in the welding thermal cycle process can be subjected to solid solution of more elemental carbon, so that the corrosion resistance of the cladding layer metal is improved and ensured;
ni: nickel is an austenite forming element and is an excellent corrosion resistant material. The invention mainly uses nickel equivalent combination (adding manganese, copper and the like) which takes nickel as a main additive element to promote that part of austenite is converted into hard phase martensite in the welding heat cycle process;
mo: molybdenum is a ferrite forming element, and the strength and the wear resistance of the cladding layer metal can be improved by refining grains and tissues, expanding quenching temperature and precipitation hardening in the welding cladding metallurgy process; the invention finds that when the content of the molybdenum element is more than 2 percent, the acid corrosion resistance can be obviously improved, and particularly, the invention has good inhibition effect on the pitting corrosion and the stress corrosion;
cu: copper is an austenite forming element, has an effect of improving corrosion resistance in a sulfuric acid medium, and can also reduce the melting point of deposited metal, thereby being beneficial to the flowing and spreading of molten metal; copper can also improve the subsequent cold-working processability of the cladding layer metal;
b: the boron and boride in the deposited metal can reduce the melting point of the deposited metal, and are beneficial to the flowing and spreading of the molten metal, so that the deposited layer of the deposited layer metal is smooth; the addition of boron and boride can improve the strength and wear resistance of deposited metal by refining grains, improving hardenability and precipitation hardening;
mn: manganese is an austenite forming element, particularly has a promoting effect on the stability of austenite, and is used as an auxiliary material of a nickel element to improve the hardness of a cladding layer by obtaining austenite and then converting partial austenite into hard-phase martensite;
si: silicon is a ferrite forming element, improves the oxidation resistance of the deposited metal through passivation, promotes the fluidity of the molten metal, and improves the strength of the deposited metal through solid solution strengthening;
nb: niobium is a stabilizing element of carbon, is designed according to the proportional relation of ten times or a little higher than the total carbon content generated in the welding metallurgy process, and improves the intergranular corrosion resistance of deposited metal by fixing carbon; niobium carbides have a precipitation hardening effect;
v: vanadium has high affinity to carbon, nitrogen and oxygen, is a stabilizing element of carbon, and can improve the toughness, strength and wear resistance of deposited metal by refining crystal grains and structures, improving the coarsening temperature of the crystal grains, improving hardenability and precipitation hardening.
Compared with the prior art, the invention has the beneficial technical effects that:
1. the cladding layer metal formed by the welding wire has an austenite, ferrite and martensite ternary combination structure, can reach a higher hardness value, and can meet the requirement of strong acid corrosion resistance; the method is matched with gas shielded welding (HW-TIG, MIG) technology, has good manufacturability, can simultaneously meet the dual requirements of realizing high hardness and strong acid corrosion resistance of the welded deposited metal, and provides powerful technical guarantee for popularizing and popularizing the application of the gas shielded welding technology in the deposition repair and fusion project of the outer surface of the hydraulic support stand column and the middle cylinder;
2. the welding wire prepared by the invention is a solid welding wire, has the characteristics of uniform and clean components, good transportability of the welding wire in the surfacing deposition process and the like, has good directionality and follow-up property with welding arcs, the deposition rate of the welding wire reaches 100 percent, the welding wire does not absorb moisture, and the storage fluidity is good.
3. The billet of the welding wire disclosed by the invention is refined, the prepared welding wire has high cleanliness, and no smoke, dust and splash exist in the welding and deposition process, and the deposition rate is 100%; the flatness of a deposited metal layer formed by welding and overlaying is good, the peak-valley difference is less than 0.3mm, and the utilization rate of the deposited metal layer is high;
4. the welding wire has low cost during welding deposition, compared with alloy powder matched with laser deposition, the welding wire has 2/3 of the cost of the laser alloy powder, and compared with the market price in the same period, the welding wire (50 yuan/Kg) of the invention is not as high as 2/3 of the laser alloy powder (80/Kg), and the alloy powder has ineffective loss;
5. the welding wire is used for a gas shielded welding process, the manufacturing cost of gas shielded welding equipment with the same purpose is only 1/5 of laser deposition equipment, the working cost of gas shielded welding is 1/4 of the laser deposition process, the production efficiency of the gas shielded welding deposition process of a single welding head is slightly higher than that of the laser deposition process, and the welding wire is matched with hot wire tungsten-inert gas (HW-TIG) welding or Metal Inert Gas (MIG) welding, so that the welding wire has the advantages of greatly reducing the investment of equipment, reducing the production cost and improving the production efficiency.
6. The welding wire is matched with a hot wire tungsten argon arc welding (HW-TIG) process method, and has excellent quality performance in the application of deposited fusion repair engineering of mechanical manufacturing and remanufacturing; when the method is matched with a Metal Inert Gas (MIG) method, the dilution rate of the base metal is controlled to be less than or equal to 25 percent, and the welding wire still has excellent performance.
Detailed Description
The following examples are intended to illustrate specific embodiments of the present invention, but are intended to illustrate the invention in detail and should not be construed as limiting the scope of the invention in any way. The instruments and devices referred to in the following examples are conventional instruments and devices unless otherwise specified; the industrial raw materials are all conventional industrial raw materials which are sold on the market if not specifically indicated; the related processing and manufacturing methods are all conventional methods unless otherwise specified.
Example 1: gas shield welding stainless steel welding wire with high hardness and strong acid corrosion resistance
The material comprises the following elements in percentage by mass: 0.01% of C, 1.2% of Mn1.2%, 0.7% of Si, 16.8% of Cr16.8%, 5.8% of Ni5, 2.8% of Mo, 3.5% of Cu3, 1.5% of B, 0.4% of Nb0.3%, 0.01% of S, 0.015% of P and the balance of Fe.
The main materials and auxiliary materials for preparing the welding wire embodiment are shown in table 1; the raw material preparation recipes (including main materials and auxiliary materials) for preparing the welding wire embodiment are shown in table 2; the test piece number is No. 1, and the test results are shown in Table 3.
The manufacturing process of the embodiment is as follows: selecting proper alloy elements, iron alloy and pure iron, and smelting in a vacuum or inert gas protection atmosphere according to a designed proportion. During smelting, when manganese is added, inert gas protection is adopted, after all materials are completely melted and homogenized for a certain time, a steel billet is cast, the steel billet is rolled into a round steel ingot, the round steel ingot is rolled into a disc, and the disc is pickled and then subjected to processing procedures such as wire drawing to prepare a finished welding wire, wherein the diameter of the welding wire is 1.2 mm.
The welding wire deposited metal test piece is 27SiMn steel, the size is 180 mm multiplied by 1200 mm, the welding method is hot wire tungsten argon arc welding (HW-TIG), the welding current is 260A, the arc voltage is 14-16V, the hot wire current is 60A, the welding speed is 450mm/min, the spiral line walking track and the flow of protective gas (Ar) is 15-20L/min; the surface temperature of the deposited metal within 3-5 screw pitches (about 8cm area) after the electric arc is less than 150 ℃; controlling the size and thickness of the fused layer hair to be 1.0-1.2 mm, after the whole test piece is fused and cooled to room temperature, carrying out rough turning, finish turning, grinding or polishing treatment, wherein the size and thickness of the fused layer finished product is 0.6 mm, the surface roughness is less than or equal to 0.35 mu m, and then carrying out metallographic structure analysis, Rockwell hardness test and copper accelerated acetate spray test (CASS).
Example 2: the difference from example 1 is that:
the material comprises the following elements in percentage by mass: 0.015% of C, 1.1% of Mn1, 0.75% of Si, 17.2% of Cr17, 5.5% of Ni5, 2.7% of Mo, 3.8% of Cu3, 1.3% of B, 0.45% of Nb0.3%, 0.011% of S, 0.016% of P and the balance of Fe.
The main materials and auxiliary materials for preparing the welding wire embodiment are shown in table 1; the raw material preparation recipes (including main materials and auxiliary materials) for preparing the welding wire embodiment are shown in table 2; the test piece number is No. 2, and the test results are shown in Table 3.
Example 3: the difference from example 1 is that:
the material comprises the following elements in percentage by mass: 0.02% of C, 1.0% of Mn1.0% of Si, 0.8% of Cr17.5% of Ni5.5%, 2.8% of Mo, 3.5% of Cu3.2% of B, 0.45% of Nb0.3% of V, 0.012% of S, 0.016% of P and the balance of Fe.
The main materials and auxiliary materials for preparing the welding wire embodiment are shown in table 1; the raw material preparation recipes (including main materials and auxiliary materials) for preparing the welding wire embodiment are shown in table 2; the test piece number is No. 3, and the test result is shown in Table 3;
table 1. preparation of the main and auxiliary materials of the welding wire examples:
TABLE 2 preparation of raw materials for implementation of the welding wire (including main and auxiliary materials)
A gas shielded welding stainless steel welding wire with high hardness and strong acid corrosion resistance is prepared by the following steps:
1) after washing the furnace, firstly adding the pretreated auxiliary materials into the bottom of a vacuum induction furnace (ZG-1500), and then putting the raw materials except manganese into the furnace in batches; vacuumizing, filling argon, electrically heating, entering a melting period, keeping the vacuum degree at 2-3 Pa, the temperature at 1560-1620 ℃ for 120-130 min, and after full melting, measuring the temperature, sampling, analyzing and adjusting the components;
2) stopping vacuumizing, filling argon to 3-3.5 KPa, adding manganese materials, entering a refining period, lasting for 50-60 min, then performing electromagnetic stirring homogenization for 8-10 min, and maintaining the temperature above 1600 ℃ to prepare for tapping;
3) tapping and casting at 1600 ℃, and naturally cooling to obtain a steel billet;
4) soaking the steel billet at 900-1000 ℃, rolling the steel billet into a wire rod with the diameter of 5.5mm, and rolling the wire rod into a coil;
5) and (3) carrying out a series of drawing production procedures on the wire rod to prepare a finished welding wire, wherein the production procedures are as follows:
disk → acid cleaning → coating → group of coarse drawing → decoating → electrolytic cleaning → bright heat treatment → coating → group of middle drawing → decoating → electrolytic cleaning → bright heat treatment → coating → group of fine drawing → finishing → rolling → finished product packaging.
The effect example:
3 welding wires with different component contents are prepared according to the embodiments 1-3, and the prepared three welding wires are subjected to the tests of melting point, structure, hardness and acid corrosion resistance, and are summarized in table 3.
The deposited metal performance of the welding wire prepared in the embodiments 1-3 is shown in table 3, and the deposited layer metal of the welding wire has higher hardness value and strong acid corrosion resistance, so that a strong technical support is provided for applying the gas shielded welding process to the deposited repair of the outer surfaces of the hydraulic support stand column and the middle cylinder.
The welding wire comprises the following alloy components and the content ranges (C is less than or equal to 0.03%, Mn is 0.6-1.5%, Si is 0.5-1.2%, Cr is 14.0-19.0%, Ni is 4.0-8.0%, Mo is 2.0-3.0%, Cu is 2.0-5.0%, B is 0.5-2.5%, Nb is 0.2-0.7%, V is 0.2-0.5%), and the concept of the design invention and the measure method adopted by the invention belong to the protection scope of the invention.
While the present invention has been described in detail with reference to the embodiments, those skilled in the art will appreciate that various changes and modifications of the specific parameters in the embodiments can be made without departing from the spirit of the present invention, and that various specific embodiments are not limited to the scope of the present invention.
Claims (8)
1. A gas shielded welding stainless steel welding wire with high hardness and strong acid corrosion resistance is characterized by comprising the following elements in percentage by mass: 0.01 to 0.02% of C, 0.8 to 1.2% of Mn, 0.6 to 0.9% of Si, 16.5 to 18.5% of Cr, 5.0 to 6.0% of Ni, 2.5 to 2.5% of Mo, 3.0 to 4.0% of Cu, 1.0 to 2.0% of B, 0.3 to 0.6% of Nb, 0.3 to 0.4% of V, less than or equal to 0.02% of S, less than or equal to 0.025% of P, and the balance of Fe.
2. The gas shield welding stainless steel welding wire with high hardness and strong acid corrosion resistance according to claim 1, which is characterized in that raw materials for preparing the welding wire comprise main materials and auxiliary materials, wherein the main materials comprise the following raw materials in parts by weight in a ratio of 100: 2: 45-55 parts of pure iron, 24-28 parts of micro-carbon ferrochrome, 5-6 parts of pure nickel, 2-5 parts of pure copper, 3-5 parts of ferromolybdenum, 5-9 parts of ferroboron, 0.9-1.5 parts of manganese metal, 0.8-1.2 parts of ferrosilicon, 0.4-1.0 part of ferroniobium and 0.3-0.6 part of ferrovanadium.
3. The gas shield welding stainless steel welding wire with high hardness and strong acid corrosion resistance as claimed in claim 2, wherein the auxiliary materials comprise the following raw materials in parts by weight: 1.5-2.0 parts of special-grade metallurgical lime and 0.4-0.8 part of fluorite.
4. The gas shield welding stainless steel welding wire having both high hardness and acid corrosion resistance according to claim 1, wherein the welding wire is a solid wire having a diameter of 0.6 to 2.0 mm.
5. A manufacturing method of a gas shield welding stainless steel welding wire coil with high hardness and strong acid corrosion resistance is characterized by comprising the following steps:
1) the stainless steel welding wire composition preparation stock according to claim 1;
2) adding auxiliary materials into a furnace, then adding main materials in batches, and keeping the vacuum degree in the furnace at 2-3 Pa, the temperature at 1560-1620 ℃ for 120-130 min during vacuum melting;
3) adding manganese under the protection of inert gas, and completely melting and homogenizing;
4) casting and cooling to form a steel billet; soaking the steel billet at 900-1000 ℃, rolling the steel billet into a wire rod with the diameter of 5.5mm, and rolling the wire rod into a coil.
6. A manufacturing method of a gas shield welding stainless steel welding wire with high hardness and strong acid corrosion resistance is characterized by comprising the following steps: the wire rod made according to the claim 5 is processed by acid cleaning, coating, rough drawing, coating removing, electrolytic cleaning, bright heat treatment, coating, middle drawing, coating removing, electrolytic cleaning, bright heat treatment, coating, fine drawing, finishing, rolling and finished product packaging in sequence.
7. Use of a gas shielded welding stainless steel wire with high hardness and high acid corrosion resistance according to claim 1, wherein the wire is compatible with gas shielded welding methods for deposited repair in machine manufacturing and remanufacturing.
8. The use of the high hardness and acid corrosion resistance gas shielded welding stainless steel welding wire according to claim 7, wherein the welding wire is used for the cladding repair of the outer surface of the hydraulic support column and the middle cylinder.
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| JPH10146691A (en) * | 1996-11-18 | 1998-06-02 | Nippon Steel Corp | Method for welding high chromium steel |
| JP2000015447A (en) * | 1998-07-07 | 2000-01-18 | Nippon Steel Corp | Welding method of martensitic stainless steel |
| GB2368849A (en) * | 2000-11-14 | 2002-05-15 | Res Inst Ind Science & Tech | Martensitic stainless steel |
| JP2007296535A (en) * | 2006-04-27 | 2007-11-15 | Kobe Steel Ltd | Gas-shielded arc welding flux-cored wire and welding method |
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