Heat-proof stainless steel gas protection welding wire of martensite
A technology of martensitic stainless steel and gas shielding, applied in welding medium, welding equipment, welding equipment, etc., can solve the problems of toughness, high plasticity index, low toughness, plasticity index, low production efficiency, etc., and achieve good comprehensive performance Effect
Inactive Publication Date: 2013-01-09
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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Problems solved by technology
The main reason is that when welding with homogeneous welding wire (martensitic), the strength and performance requirements can be met, but the toughness and plasticity indicators are low; when welding with heterogeneous welding wire (austenitic), the toughness and plasticity indicators are higher, while The strength performance is difficult to meet the requirements
From the perspective of welding methods, electrode arc welding may easily meet the performance requirements of joints, but for welding of large thickness materials, its production efficiency is very low; submerged arc automatic welding has high welding efficiency, but due to the welding line energy of this method High, the performance of the weld seam and the heat-affected zone is difficult to meet the requirements
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[0019] Using pulse mixed gas shielded welding technology with welding materials of the present invention, surfacing welding is carried out on a 16MnR test plate with a size of 300×400×16mm, and tempered at 650°C for 2 hours after welding. Cut the deposited metal part of the weld, and process it into corresponding tensile, bending and impact samples according to the national standard. The performance test was carried out according to the standard. After a series of experimental analysis (see Table 3 for the test results), it was shown that the properties of the deposited metal in the weld of 1# welding wire all meet the welding design index requirements of 0Cr11Ni2MoVNb steel, and have excellent comprehensive performance.
[0020] Six typical welding wire compositions are shown in Table 1.
[0021] The analysis results of the six welding wire components are shown in Table 2.
[0022] Table 1 Design of chemical composition of welding wire
[0023]
[0024]
[0025] Table...
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The invention relates to a martensite stainless steel gas shielded arc welding wire, which is characterized in that the chemical constitution of the welding wire has the mass percentage of: 0.04 to 0.15 of C, 0.2 to 0.7 of Si, 0.4 to 1.1 of Mn, less than or equal to 0.01 of S, less than or equal to 0.015 of P, 9.8 to 13 of Cr, 0.4 to 1.0 of Mo, 0.1 to 0.5 of V, 1.3 to 2.0 of Ni, and rest of Fe. After welding, through temper at 650 DEG C for 2 hours, the welding wire has good combination property, Sigma b is equal to 845MPa, Sigma s is equal to 745MPa, and Akv is equal to 65J, thus the martensite stainless steel gas shielded arc welding wire is suitable for welding the martensite heat-resistant stainless steel for the 0Cr11Ni2MoVNb used parts in the aviation industry and the combustion turbine in the energy field.
Description
technical field [0001] The invention relates to a gas shielded welding wire for martensitic stainless steel. Background technique [0002] 0Cr11Ni2MoVNb low-carbon high-strength heat-resistant martensitic stainless steel has obvious hardening tendency. During the welding and cooling process of this type of steel, the structure of the weld seam and the welding heat-affected zone is hard and brittle martensitic structure. When the welded joint When the degree of restraint is large or the hydrogen content is high, it is easy to cause cold cracks. In addition, when the cooling rate is small, coarse ferrite and intergranular carbides will be formed in the near seam area and weld metal, which will significantly reduce the plasticity and toughness of the joint. Therefore, the key to welding 0Cr11Ni2MoVNb steel is to obtain a weld with good toughness and satisfactory strength. [0003] The rapid development of my country's economy in the past ten years has put forward higher requi...
Claims
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IPC IPC(8): B23K35/30B23K9/16
Inventor 吴昌忠陈怀宁林泉洪黄春玲陈静李良柱
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI