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Ferrite stainless hot-rolled-and-annealed steel sheet and production method for same

A manufacturing method and technology of stainless steel, which can be applied to manufacturing tools, heat treatment furnaces, heat treatment equipment, etc., can solve problems such as inability to properly manufacture flange parts, cracks, etc., and achieve the effects of excellent blanking workability and sufficient corrosion resistance.

Pending Publication Date: 2021-06-01
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, since the thickness of the flange used in the exhaust system is relatively thick (mostly 5mm or more), there is a problem that cracks may occur during punching when manufacturing the flange, and flange parts cannot be properly manufactured. Thick ferritic stainless steel sheets with excellent punching properties are required

Method used

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  • Ferrite stainless hot-rolled-and-annealed steel sheet and production method for same
  • Ferrite stainless hot-rolled-and-annealed steel sheet and production method for same

Examples

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Embodiment

[0087] Hereinafter, the present invention will be described in detail through examples.

[0088] The molten stainless steel with the chemical composition shown in Table 1 was smelted using a 100 kg vacuum melting furnace. After heating these ingots at 1100°C for 1 hour, they were hot-rolled to the plate thickness described in Table 2 (refer to the plate thickness at the end of hot rolling in Table 2), and then performed coiling simulation treatment in which furnace cooling was performed after holding at 650°C for 1 hour. Made into hot rolled steel plate. Next, after maintaining the temperature described in Table 2 (refer to the annealing temperature of the hot-rolled sheet in Table 2) for 8 hours, the hot-rolled sheet was annealed by slow cooling to obtain a hot-rolled annealed steel sheet.

[0089] It should be noted that the thickness of each obtained hot-rolled annealed steel sheet was the same as the thickness of each finished hot-rolled sheet.

[0090] The following eva...

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Abstract

The present invention provides: a ferrite stainless hot-rolled-and-annealed steel sheet that is excellent for punching, has substantial corrosion resistance, and makes it possible to achieve a prescribed dimensional precision without cracking when punched into a thick flange; and a production method for the ferrite stainless hot-rolled-and-annealed steel sheet. A ferrite stainless hot-rolled-and-annealed steel sheet that has a ferrite single phase structure that has a component composition that contains, by mass%, 0.001%-0.020% of C, 0.05%-1.00% of Si, 0.05%-1.00% of Mn, no more than 0.04% of P, no more than 0.01% of S, 0.01%-0.10% of Al, 10.0%-20.0% of Cr, 0.50%-2.00% of Ni, 0.10%-0.40% of Ti, and 0.001%-0.020% of N, the remainder being Fe and unavoidable impurities, the average crystal grain size of the metal structure of the ferrite single phase structure being 5-20 microns.

Description

technical field [0001] The present invention relates to a ferritic stainless steel hot-rolled annealed steel sheet suitable for flanges and the like and excellent in workability, and to a method for producing the same. Background technique [0002] In recent years, in order to reduce CO as a greenhouse gas 2 Emissions, the laws and regulations on the exhaust gas of automobiles are continuously strengthened. To reduce CO in vehicle exhaust 2 Emissions are effective in improving fuel efficiency, so studies are being conducted on increasing the combustion temperature in the engine. [0003] The exhaust gas generated by the engine is released into the atmosphere through exhaust system components such as exhaust gas recirculation (Exhaust Gas Recirculation, EGR) system and muffler. In order to prevent gas leakage, the components of such an automobile exhaust system are fastened via flanges. Flanges for exhaust system components require sufficient dimensional accuracy as faste...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/00C21D8/02C22C38/50C22C38/54
CPCC22C38/00C22C38/54C21D8/02C22C38/50C22C38/002C22C38/46C21D6/005C22C38/001C21D6/004C21D8/0226C22C38/005C22C38/04C22C38/02C21D6/007C22C38/44C22C38/06C21D9/46C22C38/48C21D8/0263C22C38/52C21D6/008C22C38/42C21D8/0273C21D2211/005
Inventor 吉野正崇井上佳士高法刚
Owner JFE STEEL CORP
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