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Ferrite stainless steel sheet and production method therefor, and exhaust components

A technology of exhaust parts and stainless steel, which is applied in the direction of manufacturing tools, furnace types, furnaces, etc., and can solve problems such as low temperature strength

Pending Publication Date: 2019-11-15
NIPPON STEEL STAINLESS STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since ferritic stainless steel has low high-temperature strength compared to austenitic stainless steel, technologies for improving high-temperature strength have been developed

Method used

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  • Ferrite stainless steel sheet and production method therefor, and exhaust components
  • Ferrite stainless steel sheet and production method therefor, and exhaust components
  • Ferrite stainless steel sheet and production method therefor, and exhaust components

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0162] Steel having the chemical composition shown in Table 1 was melted and cast into a slab, and the slab was hot-rolled to form a hot-rolled steel coil with a thickness of 5 mm. Thereafter, the steel coil was cold-rolled to a thickness of 1.5 mm, annealed and pickled, and a product plate was obtained. Here, for annealing after cold rolling, the heating temperature is set to 920°C, the average cooling rate from 920°C to 800°C is set to 1.0°C / s, and the average cooling rate from 800°C to 350°C is set to 5.9 °C / s. Test pieces were collected from the obtained product boards, and the amount of P in the P compound and the elongation at break (total elongation) at room temperature were measured in accordance with the following test methods. The results are shown in Table 2.

[0163] (Extraction Residue Analysis)

[0164] Precipitates in the steel were extracted using a tetramethylammonium chloride solution and a filter with a diameter of 0.2 μm, and analyzed by ICP to measure t...

Embodiment 2

[0177] With respect to the cold-rolled steel coil (1.5 mm thickness) which has the chemical composition of A1 of Table 1, it annealed under the conditions shown in Table 3, and evaluated the said characteristic.

[0178] [table 3]

[0179] table 3

[0180]

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PUM

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Abstract

The ferrite stainless steel sheet contains a steel having a chemical composition containing, in mass%, 0.02% or less of C, 0.02% or less of N, more than 0.10% but not more than 3.0% of Si, 1.0% or less of Mn, 0.02-0.05% of P, 11.0-18.0% of Cr, 0.0001-0.0010% of B, 0.01-1.0% of Al, a total of 0.3-4.0% of Nb and / or Cu, 0-0.5% of Ti, 0-3.0% of Mo, 0-2.0% of W, 0-1.0% of V, 0-0.5% of Sn, 0-1.0% of Ni,0-0.01% of Mg, 0-0.5% of Sb, 0-0.3% of Zr, 0-0.3% of Ta, 0-0.3% of Hf, 0-0.3% of Co, 0-0.01% of Ca, 0-0.2% of REM, and 0-0.3% of Ga, the remaining portion being Fe and incidental impurities, wherein,in the steel, the contained amount of P existing as a P compound is, in mass%, 0.005% or more.

Description

technical field [0001] The present invention relates to a ferritic stainless steel sheet, a method for producing the same, and an exhaust component. Background technique [0002] Exhaust system components such as exhaust manifolds, front pipes, and center pipes of automobiles pass high-temperature exhaust gas discharged from the engine, so various properties such as oxidation resistance, high-temperature strength, and thermal fatigue characteristics are required for the materials constituting exhaust components. . [0003] In the past, cast iron was generally used for automobile exhaust components, but from the viewpoint of stricter emission regulations, improvement of engine performance, and weight reduction of vehicle bodies, exhaust manifolds made of stainless steel have begun to be used. Although there are differences depending on the vehicle model and engine structure, the exhaust parts of general gasoline vehicles are exposed to temperatures of 700-900°C for a long ti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/00C21D9/46C22C38/60
CPCC21D9/46C22C38/00C22C38/60C22C38/44
Inventor 滨田纯一矢川敦久
Owner NIPPON STEEL STAINLESS STEEL CORP