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Ferritic stainless steel

一种不锈钢、体系的技术，应用在炉、热处理设备、制造工具等方向，能够解决表面缺陷增加焊接裂纹等问题，达到焊接施工性良好、优良耐腐蚀性的效果

Active Publication Date: 2014-07-30
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] In order to solve the problems of the above-mentioned prior art, the inventor followed the previous thinking, and also considered suppressing the generation of sensitization by increasing Ti and Nb, but this also caused problems such as increased surface defects and weld cracks, so it cannot be solved. appropriate solution

Method used

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Examples

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Embodiment 1

[0087] Hereinafter, the present invention will be described based on examples.

[0088] The stainless steel shown in Table 1 was vacuum melted, heated to 1200°C, hot rolled to a plate thickness of 4 mm, annealed at 850 to 1050°C, and scaled by pickling. Further, it was cold-rolled to a plate thickness of 0.8 mm, annealed in the range of 800°C to 1000°C, and pickled to prepare a test material. It should be noted that the S value in Table 1 is defined as Si+Al+Ti, and the N value is defined as Nb+1.3Ti+0.9V+0.2Al (the elements in the formula are mass %).

[0089]

[0090] TIG welding is performed on the fabricated test material. The welding current was set to 90A, and the welding speed was set to 60 cm / min. As for the shielding gas, an Ar gas containing 2 vol% nitrogen gas at a flow rate of 15 L / min was used on the surface side (torch side), and a 100% Ar gas at a flow rate of 10 L / min was used on the back side. The width of the weld seam on the surface side is about 4 mm....

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Abstract

Provided is a ferritic stainless steel with favorable weldability and excellent corrosion resistance even under a welding condition where sensitization occurs. A ferritic stainless steel characterized by containing, by mass, 0.001-0.030% C, more than 0.3% and up to 0.55% Si, 0.05-0.50% Mn, no more than 0.05% P, no more than 0.01% S, 19.0-28.0% Cr, from 0.01% to less than 0.30% Ni, 0.2-3.0% Mo, more than 0.08% and up to 1.2% Al, 0.02-0.50% V, 0.005-0.50% Nb, 0.05-0.50% Ti, and 0.001-0.030% N, satisfying formula (1) and formula (2), and the remainder comprising Fe and unavoidable impurities.

Description

technical field [0001] The present invention relates to a ferritic stainless steel that is less likely to suffer from a drop in corrosion resistance due to nitrogen entering a weld bead from a welding shielding gas. Background technique [0002] Compared with austenitic stainless steel, ferritic stainless steel has high cost performance for corrosion resistance, good heat thermal conductivity, small coefficient of thermal expansion, and less stress. Stress Corrosion Cracking and other excellent properties are used in a wide range of applications such as automobile exhaust system components, building materials such as roofs, doors and windows, and plumbing and sanitary materials such as kitchens, water storage tanks, and hot water storage tanks. [0003] When producing these structures, stainless steel plates are often cut and formed into appropriate shapes, and then joined by welding. However, since the C and N solid solubility limits of ferritic stainless steel are small, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/00C22C38/50C22C38/54C21D9/46
CPCC21D9/46C22C38/00C22C38/50C22C38/001C22C38/004C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44C22C38/46C22C38/48C21D2211/005C22C38/54C22C38/005C22C38/52
Inventor 石井知洋石川伸尾形浩行
Owner JFE STEEL CORP