CN111136403B - High-toughness 17-4PH precipitation hardening stainless steel metal core welding wire - Google Patents
High-toughness 17-4PH precipitation hardening stainless steel metal core welding wire Download PDFInfo
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- CN111136403B CN111136403B CN202010007008.6A CN202010007008A CN111136403B CN 111136403 B CN111136403 B CN 111136403B CN 202010007008 A CN202010007008 A CN 202010007008A CN 111136403 B CN111136403 B CN 111136403B
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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
- B23K35/3086—Fe as the principal constituent with Cr as next major constituent containing Ni or Mn
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Abstract
A high-toughness 17-4PH precipitation hardening stainless steel metal-cored welding wire belongs to the field of material processing engineering and is mainly used for welding and surfacing of 17-4PH precipitation hardening stainless steel. A430 stainless steel band is adopted as a coating layer, and the mass percentage of the alloy components in the powder core is as follows: the weight percentage of the metal chromium powder is 17-25%, the weight percentage of the metal nickel powder is 13-18%, the weight percentage of the electrolytic manganese metal is 1-3%, the weight percentage of the ferromolybdenum (Mo% ═ 60%) is 0-5%, the weight percentage of the ferroniobium (Nb% ═ 60%) is 0.5-2%, the weight percentage of the pure copper powder is 11-15%, and the weight percentage of the 45% ferrosilicon is 0-2%. The mass percent of the sodium carbonate is 2-4%, and the mass percent of the potassium titanate is 2-4%. The balance of reduced iron powder. The filling rate of the flux-cored wire is 28-35%. The welding joint has excellent toughness and mechanical property.
Description
Technical Field
The invention belongs to the field of metal-cored welding wires, and particularly relates to a 17-4PH martensitic precipitation hardening stainless steel metal-cored welding wire which is mainly used for welding 17-4PH precipitation hardening stainless steel and corrosion-resistant and wear-resistant surfacing occasions on the surfaces of valves, turbine rotating wheels and the like.
Background
17-4PH is a precipitation hardening martensitic stainless steel, equivalent to the Chinese designation 0Cr17Ni4 CuNb. The strength level of the 17-4PH precipitation hardening stainless steel is equivalent to that of Cr13 martensitic stainless steel, the corrosion resistance is equivalent to that of 18-8 austenitic stainless steel, and the stainless steel has good cold and hot processing performance and casting performance and is widely applied to parts such as airplanes, engines, missiles, chemical equipment, nuclear reactors, steam turbines and the like. The 17-4PH stainless steel is applied more abroad, but the application time is not long in China and the application is relatively less.
The current welding methods of the 17-4PH precipitation hardening stainless steel mainly comprise laser welding, argon arc welding, manual electric arc welding and gas shielded welding.
17-4PH precipitation hardening stainless steel is laser welded, typically autogenous, without the use of filler material. The laser welding can also adopt powder for welding, but is mainly used for the occasion of overlaying welding, but in the aspect of overlaying welding, because laser spots are generally small and the scanning speed is slow, the laser welding is only suitable for the occasion that the thickness of the overlaying welding layer is not more than 3 mm. The laser welding can also adopt powder materials to weld 17-4PH stainless steel, but the requirement on the assembly clearance of a welding seam is very strict, and higher requirements are provided for a tool fixture, so that the workload is increased, and the laser welding is only suitable for welding precise parts at present. In addition, the laser welding equipment is expensive and high in maintenance cost, so that the application of the laser welding equipment is limited.
When the 17-4PH precipitation hardening stainless steel is subjected to manual electric arc welding, the welding material is an E0-Cr16-Ni5-Mo-Cu4-Nb welding rod, and the welding rod is high in labor intensity, low in welding efficiency and high in comprehensive welding cost, so that the precipitation hardening stainless steel is mainly used in partial maintenance occasions and is not suitable for automatic welding occasions for improving the production efficiency.
When the 17-4PH precipitation hardening stainless steel adopts argon arc welding and gas shielded welding, the main welding material is a solid welding wire. However, in the manufacturing process of the solid welding wire, due to the existence of martensite structures in the stainless steel with 17-4PH, the hardness is relatively high, and the wire breakage phenomenon is easy to generate in the drawing process. In the manufacturing process of the solid welding wire, the required wire can be manufactured only by repeatedly drawing and annealing.
In addition, when the 17-4PH precipitation hardening stainless steel is welded by adopting the solid welding wire, the chemical components of the wire rod used for manufacturing the solid welding wire can not be adjusted because the wire rod is generally from a steel mill, and the proportion of each tissue in the welding line can not be adjusted. When a certain amount of delta-ferrite is generated in a welding line, although the welding performance of the steel can be improved and the plasticity of the steel is improved, when the 17-4PH is machined, the excessive delta-ferrite can form a strip shape along the deformation direction, so that the mechanical property of the steel is reduced, certain difficulty is brought to the welding of the 17-4PH martensitic precipitation hardening stainless steel, and certain limitation is brought to the application of the 17-4PH stainless steel. In addition, when the austenite forming element in the solid wire is too much, residual austenite is formed during the cooling of the weld, and the strength of the welded joint is reduced.
The invention content is as follows:
in order to overcome the defects of the prior art, the invention develops the metal-cored welding wire for welding the 17-4PH martensitic precipitation hardening stainless steel. The metal-cored welding wire can be used for argon arc welding, carbon dioxide gas shielded welding and mixed gas shielded welding.
A17-4 PH martensitic precipitation hardening stainless steel metal core welding wire is characterized in that a 430 stainless steel strip is adopted as a coating layer, and the mass percentage of alloy components in a powder core is as follows: the weight percentage of the metal chromium powder is 17-25%, the weight percentage of the metal nickel powder is 13-18%, the weight percentage of the electrolytic manganese metal is 1-3%, the weight percentage of the ferromolybdenum (Mo% ═ 60%) is 0-5%, the weight percentage of the ferroniobium (Nb% ═ 60%) is 0.5-2%, the weight percentage of the pure copper powder is 11-15%, and the weight percentage of the 45% ferrosilicon is 0-2%. The mass percent of the sodium carbonate is 2-4%, and the mass percent of the potassium titanate is 2-4%. The balance of reduced iron powder.
The width of the 430 steel strip is 10mm, and the thickness range is 0.3-0.4 mm. The filling rate of the metal-cored welding wire is 28-35%. The diameter of the welding wire is 1.2-3.2 mm. The welding current range of the welding wire is 50-300A, and the welding voltage range is 22-35V. When argon arc welding is adopted, the protective gas is pure argon gas, and the flow of the protective gas is 10-25L/min. When gas shielded welding is adopted, the welding protective gas is 100 percent CO2Gas or 80% Ar +20% CO2The flow of the gas is 10-25L/min.
The metal powder core flux-cored wire manufactured by adopting 430 stainless steel strips comprises the following chemical components in percentage by mass:
C：0.02-0.04％，Si：0.4-0.6％，Mn：0.5-2.5％，S≤0.030，P≤0.030，Cr：16-16.75％，Ni：4.5-5.0％，Cu:3.25-4.0％，Mo≤0.75，Nb:0.15-0.3％。
the metal powder core flux-cored wire manufactured by adopting 430 stainless steel strips has the content range of the ferrite of deposited metal of 3-5 percent.
The flux-cored wire comprises the following components in parts by weight:
metal chromium powder: the alloy has the functions of alloying and improving the hardness and the strength of a welding joint, and mainly has the functions of improving the oxidation resistance and the corrosion resistance of steel and ensuring higher mechanical properties of a welding line at room temperature and high temperature.
Metallic nickel powder: plays a role in alloying, stabilizes and promotes austenite forming elements, improves the stability of austenite, improves the high-temperature strength, creep resistance and high-temperature resistance of steel, and ensures that a welding seam has higher mechanical properties at room temperature and high temperature. Nickel can improve the strength and toughness of steel.
Electrolyzing metal manganese powder: manganese is an element stabilizing and promoting austenite formation, and can improve the strength of steel. Meanwhile, manganese has the functions of deoxidizing and fixing sulfur, and the manganese and the sulfur form MnS with high melting point, so that FeS can be prevented from being formed, and the hot brittleness of the steel can be prevented.
45# ferrosilicon powder: deoxidizing during welding, increasing the metal fluidity of the molten pool, and improving the acid resistance and heat resistance of the steel.
And (3) molybdenum iron powder: the crystal grains are refined, and the crack resistance of the welding seam is improved.
Niobium-iron powder: during welding, ferrocolumbium can combine with carbon to generate NbC which is distributed in a matrix in a fine granular shape, and the NbC can prevent grains from growing up in an austenitizing temperature range. Niobium also increases the temper resistance of the steel to increase the plasticity and toughness of the steel without significantly decreasing the strength of the steel.
Reduced iron powder: and metal is transited to the welding seam, so that the conductivity is improved.
Sodium carbonate: and (4) arc stabilization, which can generate CO2 gas during welding, on one hand, can cool weld metal, and on the other hand, can protect a weld pool.
Potassium titanate: arc stabilization and reduction of spatter generated in the welding process.
The invention has the beneficial effects that:
the invention develops a special metal-core welding wire for argon arc welding and gas shielded welding for welding 17-4PH precipitation hardening stainless steel, which can be used for welding 314 stainless steel for high temperature.
Compared with a manual welding electrode for welding 17-4PH precipitation hardening stainless steel, the invention can continuously weld, can be used for semi-automatic or automatic production equipment, has higher welding speed, does not need to knock slag after welding, improves the production efficiency, reduces the labor intensity and has lower welding comprehensive cost.
Compared with the 17-4PH solid welding wire, the chemical components in the metal core are easier to adjust and the manufacturing is more convenient. In the welding process, the melting speed is higher, the welding speed is higher, and the welding production efficiency is higher. Because of adding certain arc stabilizer, the welding spatter is smaller, the welding arc is more stable, and the arc sound is softer.
Compared with a manual welding electrode and a solid welding wire for 17-4PH precipitation hardening stainless steel, the content of ferrite in deposited metal is controlled to be 3-5%, the plasticity of a welding joint is improved, the welding performance of the martensite precipitation hardening stainless steel is improved, and meanwhile, the processing performance of the welding joint and a base metal cannot be reduced.
Compared with manual welding rods and solid welding wires for 17-4PH precipitation hardening stainless steel, the invention does not generate residual austenite in deposited metal and does not reduce the strength of a welding joint.
Detailed Description
The self-protection stainless heat-resistant flux-cored wire is manufactured by adopting a conventional flux-cored wire production line. Firstly, rolling a steel strip into a U shape, then adding prepared metal powder into a U-shaped groove, and then closing the U-shaped groove to wrap the metal powder therein.
The metal powder core flux-cored wire is selected and implemented specifically. The welding parent metal is made of 17-4PH precipitation hardening stainless steel. The welding groove and the welding seam sample are selected according to GB/T17854-199 and GB 4334.5-90. The specific embodiment is as follows:
in example 1, a 430 stainless steel strip of 10X 0.3 (width 10mm, thickness 0.3mm) was used, and the filling rate was 28%. And drawing and reducing to obtain the welding wire with the diameter of 1.2 mm.
The powder core comprises the following components in percentage by mass: the mass percentage of the chromium metal powder is 25%, the mass percentage of the nickel metal powder is 18%, the mass percentage of the electrolytic manganese metal is 3%, the mass percentage of the ferromolybdenum (Mo% ═ 60%) is 5%, the mass percentage of the ferroniobium (Nb% ═ 60%) is 2%, the mass percentage of the pure copper powder is 15%, and the mass percentage of the 45% ferrosilicon is 2%. The mass percent of the sodium carbonate is 3 percent, and the mass percent of the potassium titanate is 4 percent. The balance of reduced iron powder.
The welding current adopted during welding is 50A, and the welding voltage is 22V. The welding method adopts argon arc welding. The welding protective gas is pure argon gas, and the flow of the protective gas is 10L/min.
In example 2, a 430 stainless steel strip of 10X 0.3 (width 10mm, thickness 0.3mm) was used, and the filling rate was 30%. And drawing and reducing to obtain the welding wire with the diameter of 1.6 mm.
The powder core comprises the following alloy components in percentage by mass: 20% of metal chromium powder, 16% of metal nickel powder, 2% of electrolytic manganese metal, 4% of ferromolybdenum (Mo%: 60%), 1% of ferrocolumbium (Nb%: 60%), 13% of pure copper powder and 0% of 45% of ferrosilicon. The mass percent of the sodium carbonate is 3 percent, and the mass percent of the potassium titanate is 4 percent. The balance of reduced iron powder.
The welding current adopted during welding is 90A, and the welding voltage is 23V. The welding method adopts argon arc welding. The welding protective gas is pure argon gas, and the flow of the protective gas is 15L/min.
In example 3, a 430 stainless steel strip of 10X 0.3 (width 10mm, thickness 0.3mm) was used, and the filling rate was 35%. And drawing and reducing to obtain the welding wire with the diameter of 3.2 mm.
The powder core comprises the following alloy components in percentage by mass: the mass percent of the chromium metal powder is 17%, the mass percent of the nickel metal powder is 13%, the mass percent of the electrolytic manganese metal is 1%, the mass percent of the ferromolybdenum (Mo% ═ 60%) is 3%, the mass percent of the ferroniobium (Nb% ═ 60%) is 0.5%, the mass percent of the pure copper powder is 11%, and the mass percent of the 45% ferrosilicon is 1%. The mass percent of the sodium carbonate is 2 percent, and the mass percent of the potassium titanate is 2 percent. The balance of reduced iron powder.
The welding current adopted during welding is 120A, and the welding voltage is 24V. The welding method adopts argon arc welding. The welding protective gas is pure argon gas, and the flow of the protective gas is 25L/min.
In example 4, a 430 stainless steel strip of 10X 0.4 (width 10mm, thickness 0.4mm) was used, and the filling rate was 28%. And drawing and reducing to obtain the welding wire with the diameter of 1.2 mm.
The powder core comprises the following components in percentage by mass: the mass percent of the chromium metal powder is 25%, the mass percent of the nickel metal powder is 18%, the mass percent of the electrolytic manganese metal is 3%, the mass percent of the ferromolybdenum (Mo%: 60%) is 4%, the mass percent of the ferroniobium (Nb%: 60%) is 2%, the mass percent of the pure copper powder is 14%, and the mass percent of the 45% ferrosilicon is 2%. The mass percent of the sodium carbonate is 4 percent, and the mass percent of the potassium titanate is 3 percent. The balance of reduced iron powder.
The welding current used during welding was 160A, and the welding voltage was 26V. The welding method adopts gas shielded welding. The welding protective gas is pure CO2 gas, and the flow rate of the protective gas is 10L/min.
In example 5, a 430 stainless steel strip of 10X 0.4 (width 10mm, thickness 0.4mm) was used, and the filling rate was 32%. And drawing and reducing to obtain the welding wire with the diameter of 1.6 mm.
The powder core comprises the following components in percentage by mass: the mass percent of the chromium metal powder is 24%, the mass percent of the nickel metal powder is 17%, the mass percent of the electrolytic manganese metal is 2%, the mass percent of the ferromolybdenum (Mo%: 60%) is 1%, the mass percent of the ferroniobium (Nb%: 60%) is 1.5%, the mass percent of the pure copper powder is 12%, and the mass percent of the 45% ferrosilicon is 1%. The mass percent of the sodium carbonate is 3 percent, and the mass percent of the potassium titanate is 3 percent. The balance of reduced iron powder.
The welding current adopted during welding is 180A, and the welding voltage is 28V. The welding method adopts gas shielded welding. The welding protective gas is pure CO2 gas, and the flow rate of the protective gas is 15L/min.
In example 6, a 430 stainless steel strip of 10X 0.4 (width 10mm, thickness 0.4mm) was used, and the filling rate was 35%. And drawing and reducing to obtain the welding wire with the diameter of 1.6 mm.
The powder core comprises the following components in percentage by mass: the mass percent of the chromium metal powder is 17%, the mass percent of the nickel metal powder is 13%, the mass percent of the electrolytic manganese metal is 1%, the mass percent of the ferromolybdenum (Mo%: 60%) is 0%, the mass percent of the ferroniobium (Nb%: 60%) is 0.5%, the mass percent of the pure copper powder is 14%, and the mass percent of the 45% ferrosilicon is 0%. The mass percent of the sodium carbonate is 3 percent, and the mass percent of the potassium titanate is 2 percent. The balance of reduced iron powder.
The welding current adopted during welding is 300A, and the welding voltage is 36V. The welding method adopts gas shielded welding. The welding protective gas is pure CO2 gas, and the flow rate of the protective gas is 25L/min.
Example 7 a 430 stainless steel strip of 10 x 0.4 (width 10mm, thickness 0.4mm) was selected with a 32% fill. And drawing and reducing to obtain the welding wire with the diameter of 1.2 mm.
The powder core comprises the following components in percentage by mass: the mass percent of the chromium metal powder is 19%, the mass percent of the nickel metal powder is 14%, the mass percent of the electrolytic manganese metal is 2%, the mass percent of the ferromolybdenum (Mo%: 60%) is 2%, the mass percent of the ferroniobium (Nb%: 60%) is 1%, the mass percent of the pure copper powder is 13%, and the mass percent of the 45% ferrosilicon is 1%. The mass percent of the sodium carbonate is 2 percent, and the mass percent of the potassium titanate is 4 percent. The balance of reduced iron powder.
The welding current adopted during welding is 180A, and the welding voltage is 28V. The welding method adopts gas shielded welding. The welding protective gas is 80% Ar +20% CO2 gas, and the flow rate of the protective gas is 10L/min.
Example 8, a 430 stainless steel strip of 10X 0.4 (width 10mm, thickness 0.4mm) was selected and the filling rate was 32%. And drawing and reducing to obtain the welding wire with the diameter of 1.6 mm.
The powder core comprises the following components in percentage by mass: the mass percent of the chromium metal powder is 18 percent, the mass percent of the nickel metal powder is 15 percent, the mass percent of the electrolytic manganese metal is 2 percent, the mass percent of the ferromolybdenum (Mo percent is 60 percent) is 2 percent, the mass percent of the ferroniobium (Nb percent is 60 percent) is 1 percent, the mass percent of the pure copper powder is 14 percent, and the mass percent of the 45 percent ferrosilicon is 2 percent. The mass percent of the sodium carbonate is 3 percent, and the mass percent of the potassium titanate is 3 percent. The balance of reduced iron powder.
The welding current adopted during welding is 200A, and the welding voltage is 30V. The welding method adopts gas shielded welding. The welding protective gas is 80% Ar +20% CO2 gas, and the flow rate of the protective gas is 15L/min.
Example 9A 430 stainless steel strip of 10X 0.4 (width 10mm, thickness 0.4mm) was used with a filling rate of 32%. And drawing and reducing to obtain the welding wire with the diameter of 1.6 mm.
The powder core comprises the following components in percentage by mass: the mass percent of the chromium metal powder is 20%, the mass percent of the nickel metal powder is 17%, the mass percent of the electrolytic manganese metal is 2%, the mass percent of the ferromolybdenum (Mo% ═ 60%) is 3%, the mass percent of the ferroniobium (Nb% ═ 60%) is 1%, the mass percent of the pure copper powder is 11%, and the mass percent of the 45% ferrosilicon is 1%. The mass percent of the sodium carbonate is 2 percent, and the mass percent of the potassium titanate is 3 percent. The balance of reduced iron powder.
The welding current adopted during welding is 220A, and the welding voltage is 32V. The welding method adopts gas shielded welding. The welding protective gas is 80% Ar +20% CO2 gas, and the flow rate of the protective gas is 25L/min.
Comparative example, the welding material was a solid wire ER630 for precipitation hardening stainless steel of 17-4PH, having a diameter of 1.2 mm. The welding current was 200A and the welding voltage was 30V. The welding protective gas is CO2 gas, and the flow rate of the protective gas is 15L/min.
Carrying out heat treatment on the welded joint after welding, wherein the heat treatment process comprises the following steps: solution treatment at 1050 ℃ and air cooling; aging at 620 ℃ for 4 hours. The chemical composition of deposited metal is tested according to GB/T17854-1999, and the mechanical property of the welding joint is tested according to GB 228-76. The deposited metal chemistry is shown in table 1. The weld mechanical property test results are shown in table 2. From the above test results, it can be seen that the properties of the welded joint completely meet the relevant regulations of GB (chinese national standard), and the welded joint has good crack resistance.
TABLE 1 chemical composition of deposited metal (wt%)
TABLE 2 mechanical Properties of weld joints
Claims (7)
1. A17-4 PH martensitic precipitation hardening stainless steel metal core welding wire is characterized in that a 430 stainless steel strip is adopted as a coating layer, and the mass percentage of alloy components in a powder core is as follows: 17-25% of metal chromium powder, 13-18% of metal nickel powder, 1-3% of electrolytic manganese metal, 0-5% of ferromolybdenum, 0.5-2% of ferroniobium, 11-15% of pure copper powder, 0-2% of 45% ferrosilicon, 2-4% of sodium carbonate, 2-4% of potassium titanate and the balance of reduced iron powder, wherein the mass percent of Mo in the ferromolybdenum is not less than 60% and the mass percent of Nb in the ferroniobium is not less than 60%;
when argon arc welding is adopted, the protective gas is pure argon gas, and the flow rate of the protective gas is 10-25L/min; with 100% CO2Gas or 80% Ar +20% CO2And during gas shielded welding, the flow of the shielding gas is 10-25L/min.
2. The 17-4PH martensitic precipitation hardened stainless steel metal cored welding wire of claim 1 wherein the fill factor of the cored welding wire is 28-35%.
3. A 17-4PH martensitic precipitation hardened stainless steel metal cored welding wire according to claim 1, wherein the diameter of the welding wire is in the range of 1.0-3.2 mm.
4. The 17-4PH martensitic precipitation hardened stainless steel metal cored welding wire of claim 1, wherein the welding wire uses a welding current in the range of 50-300A and a welding voltage in the range of 22-35V.
5. The 17-4PH martensitic precipitation hardening stainless steel metal-cored welding wire according to claim 1, wherein a 430 stainless steel strip is adopted to manufacture the 17-4PH martensitic precipitation hardening stainless steel metal-cored welding wire, the width of the 430 stainless steel strip is 10mm, the thickness of the 430 stainless steel strip is 0.3-0.4 mm, and the chemical composition range of deposited metal comprises the following components in percentage by mass:
0.02-0.04% of C, Si: 0.4-0.6%, Mn: 0.5-2.5%, S is less than or equal to 0.030, P is less than or equal to 0.030, Cr: 16-16.75%, Ni: 4.5 to 5.0 percent of Cu, 3.25 to 4.0 percent of Cu, less than or equal to 0.75 percent of Mo, 0.15 to 0.3 percent of Nb and the balance of Fe.
6. The 17-4PH martensitic precipitation hardened stainless steel metal-cored welding wire of claim 1, wherein the deposited metal has a ferrite content in the range of 3-5%.
7. The 17-4PH martensitic precipitation hardening stainless steel metal cored wire of claim 1, which is used for welding of 17-4PH precipitation hardening stainless steel and corrosion and wear resistant surfacing of surfaces of valves and turbine runner.
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| CN112496592B (en) * | 2020-11-14 | 2023-04-07 | 北京工业大学 | 15-5PH martensite precipitation hardening stainless steel metal core welding wire |
| CN112975208B (en) * | 2021-03-23 | 2022-05-31 | 北京工业大学 | Metal-cored welding wire for heat-resistant stainless steel submerged arc welding for magnesium smelting reduction tank |
| CN113510340B (en) * | 2021-08-10 | 2022-06-14 | 哈尔滨电气动力装备有限公司 | Welding and postweld heat treatment process method for martensite precipitation hardening stainless steel material |
| CN113894465B (en) * | 2021-11-03 | 2024-04-19 | 北京晟鼎新材料科技有限公司 | Open arc self-protection build-up welding flux-cored wire for continuous casting foot roller and zero-section roller |
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| CN107671449A (en) * | 2017-10-20 | 2018-02-09 | 西安理工大学 | A kind of precipitation-hardening stainless steel Self-protecting flux-cored wire and preparation method thereof |
| CN108015447A (en) * | 2017-11-02 | 2018-05-11 | 中冶建筑研究总院有限公司 | Continuous Casting Rolls submerged arc overlay welding precipitation hardening type stainless flux-cored wire and preparation method thereof |
| CN107900556A (en) * | 2017-12-25 | 2018-04-13 | 昆山京群焊材科技有限公司 | A kind of austenitic stainless steel self-protection flux-cored wire |
| CN108274144A (en) * | 2018-03-16 | 2018-07-13 | 西安理工大学 | 0Cr13Ni5Mo stainless steels and the stainless steel welded Self-protecting flux-cored wires and preparation method thereof of 17-4PH |
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