CN112658532B - Coating of austenitic stainless steel welding rod, preparation method and application - Google Patents
Coating of austenitic stainless steel welding rod, preparation method and application Download PDFInfo
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Abstract
The invention discloses a coating of an austenitic stainless steel welding rod, the welding rod, a preparation method and application thereof, and solves the problems that the existing welding rod has poor mechanical properties and is difficult to meet the welding requirements. The coating of the welding rod comprises the following raw materials in parts by weight: 7.0 to 10.0 parts of marble, 0.5 to 1.5 parts of barium carbonate, 2.0 to 4.0 parts of fluorite, 3.0 to 5.0 parts of fluoride, 4.0 to 6.0 parts of rutile, 0.5 to 2.0 parts of mica, 0.5 to 1.5 parts of electrolytic manganese, 0.5 to 1.5 parts of ferrotitanium, 0.5 to 1.5 parts of ferrosilicon, 3.0 to 5.0 parts of ferrochrome, 3.0 to 5.0 parts of metallic nickel, 0.0 to 1.5 parts of ferromolybdenum, 0.5 to 1.0 part of ferrochrome nitride and 0.2 to 0.5 part of sodium carbonate; the welding wire also comprises an iron-chromium-nickel-molybdenum-manganese-nitrogen alloy welding core; the invention has the advantages of excellent deposited metal mechanical property, capability of meeting the special welding requirement and the like.
Description
Technical Field
The invention relates to the technical field of welding materials, in particular to a coating of an austenitic stainless steel welding rod, the welding rod, a preparation method and application.
Background
The global energy is very short, and the environmental pollution is serious. The adoption of clean energy, green energy and renewable energy is called for, the reduction of harmful emissions becomes a main way for reducing environmental pollution, and in order to respond to energy conservation, environmental protection and emission reduction, countries in the world are rapidly developing clean energy, and China is also rapidly developing clean energy such as natural gas and hydrogen, and the green energy and the renewable energy have low operating cost and are beneficial to improving the resource utilization rate and the comprehensive benefits of the economic society.
At present, related items of equipment operation such as Liquefied Natural Gas (LNG) equipment, liquid hydrogen containers for the aerospace and automobile industries, liquid helium and urea for the aerospace and medical industries and the like are performed in China, and welding requirements for the Liquefied Natural Gas (LNG), the liquid hydrogen, the liquid helium and the urea equipment are performed under a low-temperature condition, an austenitic stainless steel welding rod in the prior art refers to stainless steel with an austenitic structure at normal temperature, when the steel contains about 18% of Cr, about 10% of Ni 8% and about 0.1% of C, the austenitic stainless steel welding rod has a stable austenitic structure, is nonmagnetic and tough and plastic, cannot meet welding requirements of the equipment such as Liquefied Natural Gas (LNG), liquid hydrogen, liquid helium and urea under an ultralow-temperature condition, and the welding rod has poor performances such as ultralow-temperature impact toughness, corrosion resistance and the like, and cannot guarantee safe and reliable operation.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the invention provides a coating of an austenitic stainless steel welding rod, the welding rod, a preparation method and application, which solve the problems that the conventional austenitic stainless steel welding rod has poor mechanical properties and is difficult to meet the required welding requirements under the ultralow temperature condition.
The invention is realized by the following technical scheme:
the coating of the austenitic stainless steel welding rod is further optimized, and comprises the following raw materials in parts by weight: 7.0 to 10.0 parts of marble, 0.5 to 1.5 parts of barium carbonate, 2.0 to 4.0 parts of fluorite, 3.0 to 5.0 parts of fluoride, 4.0 to 6.0 parts of rutile, 0.5 to 2.0 parts of mica, 0.5 to 1.5 parts of electrolytic manganese, 0.5 to 1.5 parts of ferrotitanium, 0.5 to 1.5 parts of ferrosilicon, 3.0 to 5.0 parts of ferrochrome, 3.0 to 5.0 parts of metallic nickel, 0.0 to 1.5 parts of ferromolybdenum, 0.5 to 1.0 part of ferrochrome nitride and 0.2 to 0.5 part of sodium carbonate.
And (3) marble: decomposing into CaO and CO under the action of arc heat2The material is a very common slagging and gas-making material in the manufacture of welding rods, can improve the alkalinity of molten slag, stabilize electric arc, refine molten drops, increase the interfacial tension of the molten slag and metal, improve slag removal and has better desulfurization capability.
Barium carbonate: decomposing into CaO and CO under the action of arc heat2The material is used in making slag and gas for welding rod, and has the functions of raising slag alkalinity, stabilizing electric arc, improving magnetic blow capacity, regulating slag viscosity and temperature, purifying molten pool metal, etc.
Fluorite: a certain amount of fluorite can reduce the surface tension of liquid metal, improve the fluidity of molten slag, reduce the air hole sensitivity of welding seams, improve the physical properties of the molten slag, and play a key role in welding seam forming, slag removal and the like.
Fluoride: the method has the main functions of purifying a molten pool, reducing the surface tension of liquid metal, improving the fluidity of slag, reducing the air hole sensitivity of a welding seam, adjusting the viscosity and temperature of the slag and the like, and plays a key role in the plasticity and toughness of the welding seam and the like.
Mica: the main functions are slag forming, slag thinning, plasticization and the like.
Electrolytic manganese: manganese is an austenite element. The addition of the manganese-containing alloy can play roles in desulfurization and deoxidation, can also transit/permeate manganese elements into the weld joint, improve the weld joint strength and the like.
Ferrotitanium: the addition of the alloy can play roles of pre-deoxidation, electric arc stabilization and slagging.
Silicon iron: silicon is a ferrite element. It is used as deoxidizer in welding rod, and is favorable to stabilizing electric arc, refining molten drop and improving physical performance of molten slag.
Ferrochrome: chromium is a ferrite element. Can be used for the transition/infiltration of chromium element into the welding seam, and improves the strength, yield point and corrosion resistance of the welding seam metal.
Metallic nickel: nickel is an austenite element. The alloying agent adopts powdery metallic nickel, and the nickel element is transited/infiltrated into the welding seam, so that the metal plasticity and toughness of the welding seam can be effectively improved.
Ferromolybdenum: molybdenum is a ferrite element. The alloying agent adopts the form of ferroalloy, has stable transition and small fluctuation, and can effectively improve the strength and the corrosion performance of weld metal and reduce the critical temperature of martensitic transformation at low temperature.
Ferrochromium nitride: nitrogen is an austenite element. The alloying agent can stably form nitride, so that the metal strength and the corrosion performance of the welding seam can be effectively improved.
Soda ash: binder, stable arc, etc.
Further preferably, the coating of the welding rod comprises the following raw materials in parts by weight: 7.0 parts of marble, 1.5 parts of barium carbonate, 4.0 parts of fluorite, 3.0 parts of fluoride, 6.0 parts of rutile, 0.1 part of mica, 1.5 parts of electrolytic manganese, 0.5 part of ferrotitanium, 0.5 part of ferrosilicon, 3.0 parts of ferrochrome, 5.0 parts of metallic nickel, 1.5 parts of ferromolybdenum, 0.5 part of ferrochrome nitride and 0.2 part of soda ash.
Further preferably, the coating of the welding rod comprises the following raw materials in parts by weight: 10.0 parts of marble, 0.1 part of barium carbonate, 2.0 parts of fluorite, 5.0 parts of fluoride, 4.0 parts of rutile, 2.5 parts of mica, 1.0 part of electrolytic manganese, 1.5 parts of ferrotitanium, 0.5 part of ferrosilicon, 5.0 parts of ferrochrome, 3.0 parts of metallic nickel, 0.1 part of ferromolybdenum, 1.0 part of ferrochrome nitride and 0.5 part of soda ash.
Further preferably, the coating of the welding rod comprises the following raw materials in parts by weight: 8.5 parts of marble, 0.8 part of barium carbonate, 3.0 parts of fluorite, 4.0 parts of fluoride, 5.0 parts of rutile, 1.4 parts of mica, 1.0 part of electrolytic manganese, 1.0 part of ferrotitanium, 1.0 part of ferrosilicon, 4.0 parts of ferrochrome, 4.0 parts of metallic nickel, 1.2 parts of ferromolybdenum, 0.8 part of ferrochrome nitride and 0.4 part of soda ash.
Further preferably, the chemical components of the coating raw materials of the welding rod comprise the following components in percentage by mass: CaCO in marble3The content is more than or equal to 96 percent, and BaCO is contained in barium carbonate3The content is more than or equal to 98.50 percent, and the CaF in fluorite2The content is more than or equal to 96 percent, the content of F in fluoride is more than or equal to 53 percent, the content of Na is less than or equal to 32 percent, and TiO in rutile2The content is more than or equal to 95 percent, SiO in mica248-58% of Al2O326-35 percent of the total weight of the alloy, more than or equal to 99.5 percent of Mn in electrolytic manganese, 25-35 percent of Ti in ferrotitanium, 42-47 percent of Si in ferrosilicon, 65-70 percent of Cr in ferrochromium, more than or equal to 99.5 percent of Ni in metallic nickel, 55-60 percent of Mo in ferromolybdenum, more than or equal to 60 percent of Cr in ferrochromium nitride, more than or equal to 5 percent of N, and more than or equal to 5 percent of Na in sodium carbonate2CO3The content is more than or equal to 96 percent, and the NaCl content is less than or equal to 0.7 percent.
Further preferably, the austenitic stainless steel welding rod further comprises an iron-chromium-nickel-molybdenum-manganese-nitrogen alloy core wire, and the core wire comprises the following chemical components in percentage by mass: less than or equal to 0.040 weight percent of C, less than or equal to 5.0 weight percent of Mn5.0 to 8.0 weight percent of Si, less than or equal to 0.40 weight percent of P, less than or equal to 0.020 weight percent of S, less than or equal to 18.0 weight percent of Cr18.0 to 21.0 weight percent of Ni, 15.0 to 18.0 weight percent of Ni, 2.5 to 3.5 weight percent of Mo2, less than or equal to 0.75 weight percent of Cu, less than or equal to 0.20 weight percent of N, and the balance of Fe and impurities.
More preferably, the weight of the coating of the austenitic stainless steel welding rod is 30-45% of the weight of the iron-chromium-nickel-molybdenum-manganese-nitrogen alloy core wire.
Through the optimization of the raw material composition of the flux coating and the welding rod core of the austenitic stainless steel welding rod, the austenitic stainless steel welding rod is low in magnetism or non-magnetic under the ultralow temperature condition, the impact toughness of the welding rod is excellent, the acid and seawater corrosion resistance performance is excellent, the tensile strength is improved, the elongation after fracture is increased, the normal ferrite of the welding seam metal is not more than 0.5FN, the solidification crack is avoided, the special requirements of the welding test of transportation and storage equipment of liquefied natural gas, liquid hydrogen, liquid helium and urea can be met, and the operation performance is good.
Further preferably, the preparation method of the austenitic stainless steel welding rod comprises the following steps:
step 1: pretreating raw materials; stirring and mixing the powder of the coating uniformly;
step 2: preparing a coating; adding a binder and mixing uniformly;
and step 3: pressing and coating for molding; wrapping the mixed powder on the welding core through a plodder;
and 4, step 4: drying the finished product; and heating and baking the welding core wrapped with the mixed powder step by step to obtain the welding rod.
Further preferably, in the preparation method of the austenitic stainless steel welding rod, in the step of preparing the coating, the added binder is potassium-sodium water glass, the concentration of the potassium-sodium water glass is 37.0-39.0-Be', and the added potassium-sodium water glass is 6-7 parts by weight; in the step of drying the finished product, the core wire wrapped with the mixed powder is baked for 3 hours at the temperature of 100-150 ℃ and then baked for 1.5 hours at the temperature of 300-400 ℃. The potassium-sodium water glass with certain concentration and certain quality is selected as the binder, so that the binding property of the coating can be improved; meanwhile, the welding core wrapped with the mixed powder is heated and baked step by step, and is dried at low temperature and high temperature, so that the welding core is ensured to have small splashing during welding, stable electric arc, good slag removal performance, attractive welding line forming, small magnetic blow and excellent corrosion resistance.
Further preferred is the use of an austenitic stainless steel electrode for welding steel materials including similar stainless steels 022Cr19Ni10N (i.e., 304LN), 022Cr17Ni13Mo2N (i.e., 316LN), and dissimilar low temperature steels. The austenitic stainless steel welding rod can also be used for LNG, liquid hydrogen, liquid nitrogen and urea transportation, storage equipment and the like.
The invention has the following advantages and beneficial effects:
1. the invention provides a coating of an austenitic stainless steel welding rod, which comprises the following raw materials in parts by weight: 7.0 to 10.0 parts of marble, 0.5 to 1.5 parts of barium carbonate, 2.0 to 4.0 parts of fluorite, 3.0 to 5.0 parts of fluoride, 4.0 to 6.0 parts of rutile, 0.5 to 2.0 parts of mica, 0.5 to 1.5 parts of electrolytic manganese, 0.5 to 1.5 parts of ferrotitanium, 0.5 to 1.5 parts of ferrosilicon, 3.0 to 5.0 parts of ferrochrome, 3.0 to 5.0 parts of metallic nickel, 0.0 to 1.5 parts of ferromolybdenum, 0.5 to 1.0 part of ferrochrome nitride and 0.2 to 0.5 part of sodium carbonate. The proportion relation of the raw material composition of the coating of the austenitic stainless steel welding rod is optimized, so that the slag removing performance of the welding rod is improved, electric arc is stabilized, the magnetic blow capacity is improved, the corrosion resistance is improved, slag is improved, and the weld joint is more attractive in forming;
2. the chemical components of the coating raw materials of the austenitic stainless steel welding rod comprise the following components in percentage by mass: CaCO in marble3The content is more than or equal to 96 percent, and BaCO is contained in barium carbonate3The content is more than or equal to 98.50 percent, and the CaF in fluorite2The content is more than or equal to 96 percent, the content of F in fluoride is more than or equal to 53 percent, the content of Na in the fluoride is less than or equal to 32 percent, and the content of TiO in rutile is more than or equal to2The content is more than or equal to 95 percent, SiO in mica248-58% of Al2O326-35 percent of the total weight of the alloy, more than or equal to 99.5 percent of Mn in electrolytic manganese, 25-35 percent of Ti in ferrotitanium, 42-47 percent of Si in ferrosilicon, 65-70 percent of Cr in ferrochromium, more than or equal to 99.5 percent of Ni in metallic nickel, 55-60 percent of Mo in ferromolybdenum, more than or equal to 60 percent of Cr in ferrochromium nitride, more than or equal to 5 percent of N, and more than or equal to 5 percent of Na in sodium carbonate2CO3The content is more than or equal to 96 percent, and the NaCl content is less than or equal to 0.7 percent. The purity of the coating is controlled by controlling the chemical components of the raw material composition of the coating, so that the mechanical property of the welding rod is prevented from being influenced;
3. the invention provides an austenitic stainless steel welding rod which comprises an iron-chromium-nickel-molybdenum-manganese-nitrogen alloy core wire, wherein the core wire comprises the following chemical components in percentage by mass: less than or equal to 0.040wt% of C, less than or equal to 0.0 wt% of Mn5.0-8.0 wt% of Si, less than or equal to 0.40wt% of P, less than or equal to 0.020wt% of S, less than or equal to 0.0 wt% of Cr18.0-21.0 wt%, 15.0-18.0 wt% of Ni0, 2.5-3.5 wt% of Mo2, less than or equal to 0.75wt% of Cu, less than or equal to 0.20wt% of N, and the balance of Fe and impurities. The chemical composition of the core wire of the welding rod is optimized, so that the quality and the performance of a welding seam of the welding rod during welding are ensured, and the deposited metal performance of the welding rod is improved.
4. The invention provides an austenitic stainless steel welding rod, wherein the chemical component analysis, ferrite number, ray detection, tensile test, impact test at-269 ℃ and corrosion resistance of welding deposited metal of the welding rod all meet the special requirements of LNG, liquid hydrogen, liquid helium and urea equipment, a welding seam is low-magnetic or non-magnetic in a welding state, and the room-temperature tensile strength (Rm), the room-temperature elongation after fracture (A) and the (-269 ℃) impact work (KV)2) The corrosion resistance is excellent, and the welding requirements of LNG, liquid hydrogen, liquid nitrogen and urea equipment can be met; in the welding process, the electric arc is stable, the splashing is small, the slag fluidity is good, the slag removal performance is good, the weld joint is attractive in forming, the magnetic blow is small, and the all-position operation performance is good;
5. the invention provides application of an austenitic stainless steel welding rod for welding steel materials, wherein the steel materials comprise similar stainless steels 022Cr19Ni10N, 022Cr17Ni13Mo2N and dissimilar low-temperature steels. The austenitic stainless steel welding rod can also be used for LNG, liquid hydrogen, liquid nitrogen and urea transportation, storage equipment and the like.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not used as limiting the present invention.
Example 1
In the austenitic stainless steel welding rod provided by the embodiment, the coating of the welding rod comprises the following raw materials in parts by weight: 7.0kg of marble, 1.5kg of barium carbonate, 4.0kg of fluorite, 3.0kg of fluoride, 6.0kg of rutile, 0.1kg of mica, 1.5kg of electrolytic manganese, 0.5kg of ferrotitanium, 0.5kg of ferrosilicon, 3.0kg of ferrochrome, 5.0kg of metallic nickel, 1.5kg of ferromolybdenum, 0.5kg of ferrochrome nitride and 0.2kg of soda ash;
the welding rod comprises the following raw materials in percentage by mass: CaCO in marble398.20 percent of BaCO in barium carbonate3The content of the fluorite is 98.70 percent, and the CaF in the fluorite297.30% of the total content of F in fluoride, 53.70% of the total content of Na in fluoride, 29.10% of Na in rutile and TiO in rutile295.50 percent of SiO in mica248.10% of Al2O326.50 percent of Mn in electrolytic manganese, 31.10 percent of Ti in ferrotitanium, 45.60 percent of Si in ferrosilicon, 66.50 percent of Cr in ferrochromium, 99.70 percent of Ni in metallic nickel, 56.50 percent of Mo in ferromolybdenum, 61.20 percent of Cr in ferrochromium nitride, 10.50 percent of N and Na in sodium carbonate2CO3The content is 97.50 percent, and the NaCl content is 0.35 percent;
the iron-chromium-nickel-molybdenum-manganese-nitrogen alloy welding core of the welding rod comprises the following chemical components in percentage by mass: 0.012 wt% of C, 6.5 wt% of Mn, 0.12 wt% of Si, 0.013 wt% of P, 0.005 wt% of S, 19.10 wt% of Cr and 17.20 wt% of Ni, Mo2.9wt%, Cu0.12wt%, N0.15wt%, the balance being Fe and impurities; the mass of the iron-chromium-nickel-molybdenum-manganese-nitrogen alloy welding core is 100 kg;
the preparation method of the welding rod comprises the following steps:
step 1: pretreating raw materials; stirring and mixing the coating powder of the welding rod uniformly;
step 2: preparing a coating; 6.5kg of potassium-sodium water glass with the concentration of 38 DEG Be' is added and mixed evenly;
and step 3: pressing and coating for molding; wrapping the mixed powder on the welding core through a plodder;
and 4, step 4: drying the finished product; baking the core wire wrapped with the mixed powder at 120 ℃ for 3h, and baking at 350 ℃ for heat preservation for 1.5h to obtain the austenitic stainless steel welding rod.
Example 2
This example differs from example 1 in the weight of the raw material composition of the coating of the electrode, and is otherwise the same as example 1.
In the austenitic stainless steel welding rod provided in this embodiment 2, the coating raw materials of the welding rod are as follows by weight: 10.0kg of marble, 0.1kg of barium carbonate, 2.0kg of fluorite, 5.0kg of fluoride, 4.0kg of rutile, 2.5kg of mica, 1.0kg of electrolytic manganese, 1.5kg of ferrotitanium, 0.5kg of ferrosilicon, 5.0kg of ferrochrome, 3.0kg of metallic nickel, 0.1kg of ferromolybdenum, 1.0kg of ferrochrome nitride and 0.5kg of soda ash;
example 3
This example differs from example 1 in the weight of the raw material composition of the coating of the electrode, and is otherwise the same as example 1.
In the austenitic stainless steel welding rod provided in this embodiment 3, the coating raw materials of the welding rod are as follows by weight: 8.5kg of marble, 0.8kg of barium carbonate, 3.0kg of fluorite, 4.0kg of fluoride, 5.0kg of rutile, 1.4kg of mica, 1.0kg of electrolytic manganese, 1.0kg of ferrotitanium, 1.0kg of ferrosilicon, 4.0kg of ferrochrome, 4.0kg of metallic nickel, 1.2kg of ferromolybdenum, 0.8kg of ferrochrome nitride and 0.4kg of soda ash;
example 4
Example 4 as a comparative example, a welding rod is provided having a coating comprising the following raw materials by weight: 11.0kg of marble, 9.0kg of fluorite, 1.0kg of fluoride, 3.0kg of silicate, 1.5kg of electrolytic manganese, 1.5kg of ferrotitanium, 1.5kg of ferrosilicon, 3.0kg of metallic chromium, 2.0kg of metallic nickel, 0.8kg of ferromolybdenum, 4.0kg of metallic iron and 0.6kg of soda ash;
the welding rod comprises the following raw materials in percentage by mass: CaCO in marble3The content of the fluorite is 98.20 percent, and the CaF in the fluorite297.30 percent of the content, 53.70 percent of the F content in fluoride, 29.10 percent of the Na content, 98.30 percent of the SiO2 content in silicate, 99.50 percent of the Mn content in electrolytic manganese, 31.10 percent of the Ti content in ferrotitanium, 45.60 percent of the Si content in ferrosilicon, 99.50 percent of the Cr content in chromium metal, 99.70 percent of the Ni content in nickel metal, 56.50 percent of the Mo content in ferromolybdenum, 98.20 percent of the Fe content in iron metal and 98.20 percent of the Na content in sodium carbonate2CO3The content is 97.50 percent, and the NaCl content is 0.35 percent;
the welding rod comprises the following chemical components in percentage by mass: 0.012 wt% of C, 1.5 wt% of Mn, 0.12 wt% of Si, 0.013 wt% of P, 0.005 wt% of S, 19.10 wt% of Cr and 13.20 wt% of Ni, Mo2.3wt%, Cu0.12wt%, N0.063wt%, the balance being Fe and impurities;
the austenitic stainless steel welding rod prepared in each example was subjected to a welding experiment:
and (3) welding test plates, namely adopting direct current reverse connection, preparing test pieces with the performances of impact, tension, corrosion and the like according to the 5 th test method in GB/T983 stainless steel welding rod, and preparing the test pieces according to the corresponding standards in GB/T2651 welding joint impact test method and GB/T983 stainless steel welding rod 5 th.
The detection method of the indexes of various substances of the welding rod comprises the following steps:
1. the detection method of the chemical components of the deposited metal comprises the following steps:
the chemical compositions of deposited metals of the austenitic stainless steel welding rods obtained in the respective examples are shown in table 1.
2. The detection method of the mechanical property of the deposited metal comprises the following steps:
GB/T2652-2008-type weld joint and deposited metal tensile test method
Impact test method for GB/T2650-2008 welding joint
Corrosion stainless steel intercrystalline corrosion test method for GB/T4334-
The mechanical properties of the deposited metal of the austenitic stainless steel welding rod obtained in each example are shown in table 2.
TABLE 1 Austenitic stainless Steel electrode deposited Metal chemical composition (%)
| C | Mn | Si | Cr | Ni | Mo | Cu | N | S | P | Fe | |
| Example 1 | 0.035 | 5.6 | 0.43 | 18.97 | 17.33 | 3.06 | 0.10 | 0.18 | 0.0052 | 0.014 | Balance of |
| Example 2 | 0.037 | 5.9 | 0.46 | 19.27 | 17.13 | 2.88 | 0.06 | 0.17 | 0.0051 | 0.013 | Balance of |
| Example 3 | 0.032 | 5.7 | 0.44 | 19.02 | 17.16 | 2.90 | 0.09 | 0.20 | 0.0056 | 0.015 | Balance of |
| Example 4 | 0.034 | 1.2 | 0.041 | 18.51 | 12.50 | 2.30 | 0.15 | 0.04 | 0.010 | 0.015 | Balance of |
TABLE 2 mechanical Properties of deposited metals of austenitic stainless steel welding rod
From the above table 2, the deposited metal properties of the austenitic stainless steel electrode provided by the present invention are as follows: the tensile strength Rm at room temperature is more than or equal to 550MPa, the elongation A after fracture at room temperature is more than or equal to 35.0 percent, the impact energy at 269 ℃ is more than or equal to 75J, the mechanical property of the welding rod is excellent, the corrosion resistance is excellent at ultralow temperature, the welding requirements of LNG, liquid hydrogen, liquid nitrogen and urea equipment can be met, and the welding seam is low-magnetic or non-magnetic in a welding state.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (8)
1. The austenitic stainless steel welding rod is characterized by comprising a coating of the austenitic stainless steel welding rod and an iron-chromium-nickel-molybdenum-manganese-nitrogen alloy core wire, wherein the core wire comprises the following chemical components in percentage by mass: less than or equal to 0.040wt% of C, less than or equal to 0.0 wt% of Mn5.0-8.0 wt% of Si, less than or equal to 0.40wt% of P, less than or equal to 0.020wt% of S, less than or equal to 0.0 wt% of Cr18.0-21.0 wt%, 15.0-18.0 wt% of Ni15, 2.5-3.5 wt% of Mo2, less than or equal to 0.75wt% of Cu, less than or equal to 0.20wt% of N, and the balance of Fe and impurities;
the coating of the welding rod comprises the following raw materials in parts by weight: 7.0 to 10.0 parts of marble, 0.5 to 1.5 parts of barium carbonate, 2.0 to 4.0 parts of fluorite, 3.0 to 5.0 parts of fluoride, 4.0 to 6.0 parts of rutile, 0.5 to 2.0 parts of mica, 0.5 to 1.5 parts of electrolytic manganese, 0.5 to 1.5 parts of ferrotitanium, 0.5 to 1.5 parts of ferrosilicon, 3.0 to 5.0 parts of ferrochrome, 3.0 to 5.0 parts of metallic nickel, 0.0 to 1.5 parts of ferromolybdenum, 0.5 to 1.0 part of ferrochrome nitride and 0.2 to 0.5 part of sodium carbonate;
the weight of the coating of the austenitic stainless steel welding rod is 30-45% of the weight of the iron-chromium-nickel-molybdenum-manganese-nitrogen alloy welding core.
2. The austenitic stainless steel welding electrode according to claim 1, wherein the coating of the electrode comprises the following raw materials in parts by weight: 7.0 parts of marble, 1.5 parts of barium carbonate, 4.0 parts of fluorite, 3.0 parts of fluoride, 6.0 parts of rutile, 0.1 part of mica, 1.5 parts of electrolytic manganese, 0.5 part of ferrotitanium, 0.5 part of ferrosilicon, 3.0 parts of ferrochrome, 5.0 parts of metallic nickel, 1.5 parts of ferromolybdenum, 0.5 part of ferrochrome nitride and 0.2 part of soda ash.
3. The austenitic stainless steel welding electrode according to claim 1, wherein the coating of the welding electrode comprises the following raw materials in parts by weight: 10.0 parts of marble, 0.1 part of barium carbonate, 2.0 parts of fluorite, 5.0 parts of fluoride, 4.0 parts of rutile, 2.5 parts of mica, 1.0 part of electrolytic manganese, 1.5 parts of ferrotitanium, 0.5 part of ferrosilicon, 5.0 parts of ferrochrome, 3.0 parts of metallic nickel, 0.1 part of ferromolybdenum, 1.0 part of ferrochrome nitride and 0.5 part of soda ash.
4. The austenitic stainless steel welding electrode according to claim 1, wherein the coating of the electrode comprises the following raw materials in parts by weight: 8.5 parts of marble, 0.8 part of barium carbonate, 3.0 parts of fluorite, 4.0 parts of fluoride, 5.0 parts of rutile, 1.4 parts of mica, 1.0 part of electrolytic manganese, 1.0 part of ferrotitanium, 1.0 part of ferrosilicon, 4.0 parts of ferrochrome, 4.0 parts of metallic nickel, 1.2 parts of ferromolybdenum, 0.8 part of ferrochrome nitride and 0.4 part of soda ash.
5. The austenitic stainless steel welding electrode according to any of claims 1 to 4, wherein the chemical composition of the coating raw material of the electrode comprises, in mass percent: CaCO in marble3The content is more than or equal to 96 percent, and BaCO is contained in barium carbonate3The content is more than or equal to 98.50 percent, and the CaF in fluorite2The content is more than or equal to 96 percent, the content of F in fluoride is more than or equal to 53 percent, the content of Na is less than or equal to 32 percent, and TiO in rutile2The content is more than or equal to 95 percent, SiO in mica248-58% of Al2O326 to 35 percent of manganese, more than or equal to 99.5 percent of Mn in electrolytic manganese, 25 to 35 percent of Ti in ferrotitanium, 42 to 47 percent of Si in ferrosilicon, 65 to 70 percent of Cr in ferrochromium, more than or equal to 99.5 percent of Ni in metallic nickel, and more than or equal to 99.5 percent of Mo in ferromolybdenum55-60 percent of chromium iron nitride, more than or equal to 60 percent of Cr, more than or equal to 5 percent of N and more than or equal to Na in sodium carbonate2CO3The content is more than or equal to 96 percent, and the NaCl content is less than or equal to 0.7 percent.
6. A method for preparing an austenitic stainless steel welding electrode, the austenitic stainless steel welding electrode being the austenitic stainless steel welding electrode of claim 1, the method for preparing the austenitic stainless steel welding electrode comprising:
step 1: pretreating raw materials; stirring and mixing the powder of the coating uniformly;
step 2: preparing a coating; adding a binder and mixing uniformly;
and step 3: pressing and coating for molding; wrapping the mixed powder on the welding core through a plodder;
and 4, step 4: drying the finished product; and heating and baking the welding core wrapped with the mixed powder step by step to obtain the welding rod.
7. The method for preparing an austenitic stainless steel welding electrode according to claim 6, wherein in the step of preparing the coating material, the binder is added potassium sodium silicate, the concentration of the potassium sodium silicate is 37.0 ° Be ˝ -39.0 ° Be ˝, and the added potassium sodium silicate is 6-7 parts by weight; in the step of drying the finished product, the core wire wrapped with the mixed powder is baked for 3 hours at the temperature of 100-150 ℃ and then baked for 1.5 hours at the temperature of 300-400 ℃.
8. Use of an austenitic stainless steel electrode as claimed in any of claims 1-5 or as prepared by the method of preparation of an austenitic stainless steel electrode as claimed in any of claims 6-7, for welding steel materials comprising similar stainless steels 022Cr19Ni10N, 022Cr17Ni13Mo2N and dissimilar low temperature steels.
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