CN106736029B - A high-nitrogen austenitic stainless steel welding wire and its welding process - Google Patents
A high-nitrogen austenitic stainless steel welding wire and its welding process Download PDFInfo
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 111
- 238000003466 welding Methods 0.000 title claims abstract description 99
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 82
- 229910000963 austenitic stainless steel Inorganic materials 0.000 title claims abstract description 47
- 238000000034 method Methods 0.000 title claims abstract description 16
- 239000000203 mixture Substances 0.000 claims abstract description 13
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 12
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 12
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 12
- 239000000126 substance Substances 0.000 claims abstract description 12
- 229910052751 metal Inorganic materials 0.000 claims abstract description 8
- 239000002184 metal Substances 0.000 claims abstract description 8
- 239000011229 interlayer Substances 0.000 claims abstract description 7
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 7
- 239000012535 impurity Substances 0.000 claims abstract description 6
- 229910052742 iron Inorganic materials 0.000 claims abstract description 6
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 6
- 239000007789 gas Substances 0.000 claims description 9
- 229910052750 molybdenum Inorganic materials 0.000 claims description 8
- 238000003723 Smelting Methods 0.000 claims description 5
- 230000007547 defect Effects 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 claims description 4
- 238000005096 rolling process Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 abstract description 11
- 239000011261 inert gas Substances 0.000 abstract description 6
- 238000010521 absorption reaction Methods 0.000 abstract description 4
- 238000012545 processing Methods 0.000 abstract description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 18
- 239000011651 chromium Substances 0.000 description 11
- 230000007797 corrosion Effects 0.000 description 9
- 238000005260 corrosion Methods 0.000 description 9
- 238000005275 alloying Methods 0.000 description 7
- 239000011572 manganese Substances 0.000 description 7
- 239000011148 porous material Substances 0.000 description 6
- 229910000859 α-Fe Inorganic materials 0.000 description 6
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 5
- 229910045601 alloy Inorganic materials 0.000 description 4
- 239000000956 alloy Substances 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 4
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 230000004927 fusion Effects 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 2
- 229910001566 austenite Inorganic materials 0.000 description 2
- 239000010953 base metal Substances 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 150000001247 metal acetylides Chemical class 0.000 description 2
- 239000011733 molybdenum Substances 0.000 description 2
- 150000004767 nitrides Chemical class 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 239000006104 solid solution Substances 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- 206010070834 Sensitisation Diseases 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000006399 behavior Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 229910000734 martensite Inorganic materials 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000008313 sensitization Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
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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
-
- 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
- B23K35/40—Making wire or rods for soldering or welding
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Arc Welding In General (AREA)
Abstract
本发明属于材料加工领域，尤其涉及一种适用于高氮奥氏体不锈钢焊接的奥氏体不锈钢焊丝及其焊接工艺。该焊丝的化学成分按重量百分比表示为：C：0.01％～0.03％，Si：0.75％～0.90％，Mn：2.0％～6.0％，Cr：18％～22％，Ni：6.0％～9.0％，Mo：≤0.1％，N：0.20％～0.40％，P：≤0.01％，S：≤0.01％，余量为铁和杂质。上述焊丝的焊接工艺：在热输入为10～18kJ/cm的条件下，采用熔化极惰性气体保护焊进行焊接，层间温度小于100℃。本发明焊丝适用于6～20mm厚、氮含量0.50％～0.70％的高氮奥氏体不锈钢的焊接，焊缝金属具有良好的强韧性，抗拉强度≥870MPa，‑40℃冲击吸收功≥60J。The invention belongs to the field of material processing, and in particular relates to an austenitic stainless steel welding wire suitable for welding high-nitrogen austenitic stainless steel and a welding process thereof. The chemical composition of the wire is expressed by weight percentage: C: 0.01% ~ 0.03%, Si: 0.75% ~ 0.90%, Mn: 2.0% ~ 6.0%, Cr: 18% ~ 22%, Ni: 6.0% ~ 9.0% , Mo: ≤0.1%, N: 0.20%～0.40%, P: ≤0.01%, S: ≤0.01%, and the balance is iron and impurities. The welding process of the above-mentioned welding wire: Under the condition of heat input of 10-18kJ/cm, the welding is carried out by metal inert gas shielded welding, and the interlayer temperature is less than 100°C. The welding wire of the invention is suitable for welding high-nitrogen austenitic stainless steel with a thickness of 6-20mm and a nitrogen content of 0.50%-0.70%. The weld metal has good toughness, tensile strength ≥ 870MPa, and impact absorption energy ≥ 60J at -40°C. .
Description
技术领域technical field
本发明属于材料加工领域，尤其涉及一种适用于高氮奥氏体不锈钢焊接的奥氏体不锈钢焊丝及其焊接工艺。The invention belongs to the field of material processing, and in particular relates to an austenitic stainless steel welding wire suitable for welding high-nitrogen austenitic stainless steel and a welding process thereof.
背景技术Background technique
高氮奥氏体不锈钢是指氮含量超过0.4wt％的奥氏体不锈钢，它是目前正在蓬勃发展的一类新型工程材料。高氮奥氏体不锈钢主要是利用氮元素来部分甚至完全代替合金元素镍以获得奥氏体组织，利用氮进行合金化具有很多优点：(1)与碳相比，氮为更加有效的固溶强化元素，同时可以促进晶粒细化；(2)氮是强烈的奥氏体形成化元素，可以减少合金中的镍含量，降低铁素体和形变马氏体形成能力；(3)尽管氮对材料在酸中抗总体腐蚀性能没有明显改善，但可以极大地提高材料抗点蚀和缝隙腐蚀能力。因此，高氮奥氏体不锈钢具有良好的强韧性和耐蚀性。High-nitrogen austenitic stainless steel refers to austenitic stainless steel with a nitrogen content exceeding 0.4wt%, which is a new type of engineering material that is currently developing vigorously. High-nitrogen austenitic stainless steel mainly uses nitrogen to partially or even completely replace the alloying element nickel to obtain an austenite structure. The use of nitrogen for alloying has many advantages: (1) Compared with carbon, nitrogen is a more effective solid solution (2) Nitrogen is a strong austenite forming element, which can reduce the nickel content in the alloy and reduce the formation ability of ferrite and deformed martensite; (3) Although nitrogen There is no significant improvement in the overall corrosion resistance of the material in acid, but it can greatly improve the resistance to pitting and crevice corrosion. Therefore, high nitrogen austenitic stainless steel has good strength, toughness and corrosion resistance.
高氮奥氏体不锈钢具有高氮的性质，其熔化焊接时可能会出现的问题：(1)焊缝区氮的损失即氮气孔的形成和氮的逸出，降低了焊缝中的固溶氮含量，造成接头性能的下降；(2)焊缝区和焊接热影响区氮化物、碳化物以及碳氮化物的析出，力学性能和抗腐蚀性能都会随之下降；(3)焊缝凝固裂纹及热影响区液化裂纹的形成。当高氮奥氏体不锈钢焊接接头出现上述问题时，接头力学性能、耐蚀性能都会随之下降，如何选择焊接工艺以及合适的焊接材料解决这些问题，将关系着高氮奥氏体不锈钢的应用前景。High-nitrogen austenitic stainless steel has high-nitrogen properties, and problems that may occur during fusion welding: (1) The loss of nitrogen in the weld zone, that is, the formation of nitrogen pores and the escape of nitrogen, reduces the solid solution in the weld (2) The precipitation of nitrides, carbides, and carbonitrides in the weld zone and the welding heat-affected zone will decrease the mechanical properties and corrosion resistance; (3) The weld solidification cracks and the formation of liquefaction cracks in the heat-affected zone. When the above problems occur in the high-nitrogen austenitic stainless steel welded joints, the mechanical properties and corrosion resistance of the joints will decrease accordingly. How to choose the welding process and suitable welding materials to solve these problems will be related to the application of high-nitrogen austenitic stainless steel prospect.
目前，市场上没有针对高氮奥氏体不锈钢的焊接材料，焊接材料的开发与选用基本上存在两种方向，一类是Ni基合金，即采用含镍量高并含有大量的Cr、Mo等合金元素的超合金化焊接材料进行焊接，焊后可以获得相对满意的耐腐蚀性能，但常规的力学性能稍差，焊缝中氮气孔形成难以控制；另一类就是奥氏不锈钢焊丝，例如采用Cr20Ni10Mn7Mo焊丝，强韧性与母材相当，但焊缝存在大量的氮气孔。At present, there are no welding materials for high-nitrogen austenitic stainless steel on the market. There are basically two directions for the development and selection of welding materials. One is Ni-based alloys, which use high nickel content and contain a large amount of Cr, Mo, etc. Welding with superalloyed welding materials of alloying elements, relatively satisfactory corrosion resistance can be obtained after welding, but the conventional mechanical properties are slightly poor, and the formation of nitrogen pores in the weld is difficult to control; the other type is austenitic stainless steel welding wire, such as using Cr 20 Ni 10 Mn 7 Mo welding wire has the same strength and toughness as the base metal, but there are a lot of nitrogen pores in the weld.
因此，随着高氮奥氏体不锈钢的广泛应用，焊接材料的研制及其焊接工艺的选择成为亟待解决的问题。Therefore, with the wide application of high-nitrogen austenitic stainless steel, the development of welding materials and the selection of welding processes have become urgent problems to be solved.
发明内容Contents of the invention
针对上述技术问题，本发明的目的是提供一种适用于高氮奥氏体不锈钢焊接的奥氏体不锈钢焊丝及其焊接工艺，解决现有高氮奥氏体不锈钢焊接问题尤其是氮气孔问题。In view of the above technical problems, the purpose of the present invention is to provide an austenitic stainless steel welding wire suitable for welding high nitrogen austenitic stainless steel and its welding process, so as to solve the existing welding problems of high nitrogen austenitic stainless steel, especially the problem of nitrogen pores.
为了实现上述目的，本发明提供了如下技术方案：In order to achieve the above object, the present invention provides the following technical solutions:
本发明提供一种高氮奥氏体不锈钢焊丝，该焊丝的化学成分按重量百分比表示为：C：0.01％～0.03％，Si：0.75％～0.90％，Mn：2.0％～6.0％，Cr：18％～22％，Ni：6.0％～9.0％，Mo：≤0.1％，N：0.20％～0.40％，P：≤0.01％，S：≤0.01％，余量为铁和杂质。The invention provides a high-nitrogen austenitic stainless steel welding wire. The chemical composition of the welding wire is represented by weight percentage: C: 0.01%-0.03%, Si: 0.75%-0.90%, Mn: 2.0%-6.0%, Cr: 18% to 22%, Ni: 6.0% to 9.0%, Mo: ≤0.1%, N: 0.20% to 0.40%, P: ≤0.01%, S: ≤0.01%, and the balance is iron and impurities.
优选地，该焊丝的化学成分按重量百分比表示为：C：0.01％～0.02％，Si：0.80％～0.85％，Mn：3.5％～6.0％，Cr：19％～22％，Ni：6.0％～8.5％，Mo：≤0.1％，N：0.25％～0.35％，P：≤0.01％，S：≤0.01％，余量为铁和杂质。Preferably, the chemical composition of the welding wire is represented by weight percentage: C: 0.01%-0.02%, Si: 0.80%-0.85%, Mn: 3.5%-6.0%, Cr: 19%-22%, Ni: 6.0% ～8.5%, Mo: ≤0.1%, N: 0.25%～0.35%, P: ≤0.01%, S: ≤0.01%, and the balance is iron and impurities.
所述高氮奥氏体不锈钢焊丝通过冶炼→轧制→热处理→拉拔工艺制备。The high-nitrogen austenitic stainless steel welding wire is prepared through the process of smelting→rolling→heat treatment→drawing.
所述高氮奥氏体不锈钢焊丝适用于6～20mm厚、氮含量0.50％～0.70％的高氮奥氏体不锈钢的焊接。The high-nitrogen austenitic stainless steel welding wire is suitable for welding high-nitrogen austenitic stainless steel with a thickness of 6-20mm and a nitrogen content of 0.50%-0.70%.
采用所述高氮奥氏体不锈钢焊丝焊接的焊接接头缺欠质量不低于1级焊缝，焊缝金属抗拉强度≥870MPa，-40℃冲击吸收功≥60J。The defect quality of the welded joint welded by the high-nitrogen austenitic stainless steel wire is not lower than the first-class weld, the tensile strength of the weld metal is ≥870MPa, and the impact absorption energy at -40°C is ≥60J.
本发明提供一种利用所述的高氮奥氏体不锈钢焊丝的焊接工艺，在热输入为10～18kJ/cm的条件下，采用熔化极惰性气体保护焊进行焊接，层间温度小于100℃。The invention provides a welding process using the high-nitrogen austenitic stainless steel welding wire. Under the condition of heat input of 10-18kJ/cm, the welding is carried out by molten inert gas shielded welding, and the interlayer temperature is less than 100°C.
所使用的保护气体为Ar+2％～4％N2混合气体。The protective gas used is Ar+2%-4%N 2 mixed gas.
与现有技术相比，本发明的有益效果在于：Compared with prior art, the beneficial effect of the present invention is:
本发明所述的焊丝，可用于氮含量0.50％～0.70％的高氮奥氏体不锈钢的焊接，焊接接头缺欠质量不低于1级焊缝，焊缝金属具有良好的强韧性，抗拉强度≥870MPa，-40℃冲击吸收功≥60J。The welding wire described in the present invention can be used for welding high-nitrogen austenitic stainless steel with a nitrogen content of 0.50% to 0.70%. The quality of the welded joint defect is not lower than the first-grade weld, and the weld metal has good toughness and tensile strength. ≥870MPa, -40℃ impact absorption energy ≥60J.
具体实施方式Detailed ways
下面结合实施例对本发明进行进一步说明。The present invention is further described below in conjunction with embodiment.
针对上述目的，本发明提供一种适用于高氮奥氏体不锈钢焊接的奥氏体不锈钢焊丝，其化学成分重量百分比为：C：0.01％～0.03％，Si：0.75％～0.90％，Mn：2.0％～6.0％，Cr：18％～22％，Ni：6.0％～9.0％，Mo：≤0.1％，N：0.20％～0.40％，P：≤0.01％，S：≤0.01％，余量为铁和通常炼钢存在的杂质。In view of the above purpose, the present invention provides an austenitic stainless steel welding wire suitable for welding high-nitrogen austenitic stainless steel. 2.0%～6.0%, Cr: 18%～22%, Ni: 6.0%～9.0%, Mo: ≤0.1%, N: 0.20%～0.40%, P: ≤0.01%, S: ≤0.01%, balance An impurity present in iron and steelmaking in general.
其中，in,
N：氮是强烈的奥氏体化元素，这是采用氮进行合金化的一个主要原因。作为高氮奥氏体不锈钢中主要的合金元素氮，使材料具有优良的综合性能性能。综合考虑氮对材料性能的影响、氮的溶解度极限、熔焊时母材熔合比、焊丝焊接冶炼加工和焊接工艺性能的影响，本发明焊丝氮含量选择为0.20～0.40wt％。N: Nitrogen is a strong austenitizing element, which is a major reason for alloying with nitrogen. As the main alloying element nitrogen in high-nitrogen austenitic stainless steel, the material has excellent comprehensive properties. Comprehensively considering the influence of nitrogen on material properties, the solubility limit of nitrogen, the fusion ratio of base metal during fusion welding, the influence of welding wire welding smelting processing and welding process performance, the nitrogen content of the welding wire of the present invention is selected to be 0.20-0.40wt%.
Cr：铬是在焊丝的组分中最重要的合金元素之一，它使合金具备了最基本的抗腐蚀性能。铬可以提高氮在基体中的溶解度；同时铬也是铁素体形成元素，会对焊缝的凝固行为产生影响。本发明焊丝铬含量选择为18～22wt％。Cr: Chromium is one of the most important alloying elements in the composition of welding wire, which makes the alloy have the most basic corrosion resistance. Chromium can increase the solubility of nitrogen in the matrix; at the same time, chromium is also a ferrite forming element, which will affect the solidification behavior of the weld. The chromium content of the welding wire of the present invention is selected to be 18-22wt%.
Ni：在焊丝设计中，通过加入一定量的合金元素镍，一方面可以起到控制凝固态焊缝组织中的铁素体含量；另一方面，镍的加入可以用来提高焊缝的韧性。本发明焊丝镍含量选择为6.0～9.0wt％。Ni: In the design of welding wire, by adding a certain amount of alloying element nickel, on the one hand, it can control the ferrite content in the solidified weld structure; on the other hand, the addition of nickel can be used to improve the toughness of the weld. The content of nickel in the welding wire of the present invention is selected to be 6.0-9.0 wt%.
C元素：为了降低由于敏化反应(碳化物的沿晶析出)所引发晶界铬元素的降低所引起接头抗腐蚀性能的降低，本发明在焊丝设计中严格控制碳含量，选择为0.1～0.3wt％。C element: In order to reduce the reduction of the corrosion resistance of joints caused by the reduction of chromium at the grain boundary caused by the sensitization reaction (intergranular precipitation of carbides), the present invention strictly controls the carbon content in the design of the welding wire, and selects it as 0.1-0.3 wt%.
Mn：锰既是非氮化物形成元素，又能提高氮在合金中的溶解度，所以在高氮奥氏体不锈钢焊丝设计中可以添加适量的锰以达到增氮的目的，本发明焊丝锰含量选择为2.0～6.0wt％。Mn: Manganese is not only a non-nitride forming element, but also can increase the solubility of nitrogen in the alloy. Therefore, in the design of high nitrogen austenitic stainless steel welding wire, an appropriate amount of manganese can be added to achieve the purpose of increasing nitrogen. The content of manganese in the welding wire of the present invention is selected as 2.0 to 6.0 wt%.
Mo：大幅提高不锈钢的抗全面和局部腐蚀性能，但钼是强烈的铁素体化形成元素，会使焊缝保留较多的铁素体，而氮在铁素体中较低的溶解度可能会降低焊缝中的氮含量，对接头的强度不利。本发明焊丝控制钼含量不大于0.1wt％。Mo: greatly improves the general and local corrosion resistance of stainless steel, but molybdenum is a strong ferrite forming element, which will make the weld retain more ferrite, and the lower solubility of nitrogen in ferrite may cause Reducing the nitrogen content in the weld is detrimental to the strength of the joint. The molybdenum content of the welding wire of the invention is controlled to be no more than 0.1 wt%.
本发明所述高氮奥氏体不锈钢焊丝通过冶炼→轧制→热处理→拉拔工艺制备，具体为：The high-nitrogen austenitic stainless steel welding wire of the present invention is prepared by smelting→rolling→heat treatment→drawing process, specifically:
根据本发明焊丝的化学成分范围进行控制冶炼，对冶炼好的钢锭轧制成盘条，再进行热处理、拉拔，最终获得Ф1.2mm尺寸的焊丝。Controlled smelting is carried out according to the chemical composition range of the welding wire of the invention, and the smelted steel ingot is rolled into a wire rod, and then subjected to heat treatment and drawing to finally obtain a welding wire with a size of Ф1.2mm.
本发明所述的焊丝，可用于6～20mm厚、氮含量0.50％～0.70％的高氮奥氏体不锈钢的焊接，焊接接头缺欠质量不低于1级焊缝，焊缝金属具有良好的强韧性，抗拉强度≥870MPa，-40℃冲击吸收功≥60J。The welding wire described in the present invention can be used for welding high-nitrogen austenitic stainless steel with a thickness of 6-20mm and a nitrogen content of 0.50%-0.70%. Toughness, tensile strength ≥ 870MPa, -40 ℃ impact absorption energy ≥ 60J.
利用本发明所述的焊丝的进行焊接的焊接工艺为：在热输入为10～18kJ/cm的条件下，采用熔化极惰性气体保护焊进行试板焊接，保护气体为Ar+2％-4％N2混合气体，层间温度小于100℃。The welding process for welding using the welding wire of the present invention is: under the condition of heat input of 10-18kJ/cm, the test plate is welded by molten inert gas shielded welding, and the shielding gas is Ar+2%-4% N 2 mixed gas, the interlayer temperature is less than 100°C.
实施例1Example 1
针对14mm厚高氮奥氏体不锈钢，采用本发明焊丝进行熔化极惰性气体保护焊接，高氮奥氏体不锈钢和焊丝化学成分如表1所示。焊接电压20V，焊接电流180A，焊接速度20cm/min，热输入为10.8kJ/cm，保护气体为Ar+2.5％N2，层间温度小于100℃。焊接接头无气孔、裂纹，焊缝金属抗拉强度895MPa，-40℃冲击吸收功95J。For high nitrogen austenitic stainless steel with a thickness of 14 mm, the welding wire of the present invention is used for inert gas shielded welding. The chemical composition of high nitrogen austenitic stainless steel and welding wire is shown in Table 1. The welding voltage is 20V, the welding current is 180A, the welding speed is 20cm/min, the heat input is 10.8kJ/cm, the shielding gas is Ar+2.5%N 2 , and the interlayer temperature is less than 100°C. The welded joint has no pores and cracks, the tensile strength of the weld metal is 895MPa, and the impact energy absorbed at -40°C is 95J.
表1实施例1高氮奥氏体不锈钢和焊丝化学成分(wt％)Table 1 Embodiment 1 high nitrogen austenitic stainless steel and welding wire chemical composition (wt%)
实施例2Example 2
针对20mm厚高氮奥氏体不锈钢，采用本发明焊丝进行熔化极惰性气体保护焊接，高氮奥氏体不锈钢和焊丝化学成分如表2所示。焊接电压30V，焊接电流300A，焊接速度30cm/min，热输入为18kJ/cm，保护气体为Ar+4.0％N2，层间温度小于100℃。焊接接头缺欠质量达到1级，焊缝金属抗拉强度875MPa，-40℃冲击吸收功102J。For high nitrogen austenitic stainless steel with a thickness of 20 mm, the welding wire of the present invention is used for inert gas shielded welding. The chemical composition of high nitrogen austenitic stainless steel and welding wire is shown in Table 2. The welding voltage is 30V, the welding current is 300A, the welding speed is 30cm/min, the heat input is 18kJ/cm, the shielding gas is Ar+4.0%N 2 , and the interlayer temperature is less than 100°C. The defect quality of the welded joint reaches Grade 1, the tensile strength of the weld metal is 875MPa, and the impact energy absorbed at -40°C is 102J.
表2实施例2高氮奥氏体不锈钢和焊丝化学成分(wt％)Table 2 embodiment 2 high nitrogen austenitic stainless steel and welding wire chemical composition (wt %)
实施例3Example 3
针对8mm厚高氮奥氏体不锈钢，采用本发明焊丝进行熔化极惰性气体保护焊接，高氮奥氏体不锈钢和焊丝化学成分如表3所示。焊接电压20V，焊接电流180A，焊接速度20cm/min，热输入为10.8kJ/cm，保护气体为Ar+2.5％N2，层间温度小于100℃。焊接接头无气孔、裂纹，焊缝金属抗拉强度910MPa，-40℃冲击吸收功61J。For high nitrogen austenitic stainless steel with a thickness of 8 mm, the welding wire of the present invention is used for inert gas shielded welding. The chemical composition of high nitrogen austenitic stainless steel and welding wire is shown in Table 3. The welding voltage is 20V, the welding current is 180A, the welding speed is 20cm/min, the heat input is 10.8kJ/cm, the shielding gas is Ar+2.5%N 2 , and the interlayer temperature is less than 100°C. The welded joint has no pores and cracks, the tensile strength of the weld metal is 910MPa, and the impact energy absorbed at -40°C is 61J.
表3实施例3高氮奥氏体不锈钢和焊丝化学成分(wt％)Table 3 embodiment 3 high nitrogen austenitic stainless steel and welding wire chemical composition (wt %)
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