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Nb-containing ferritic stainless steel sheet and manufacturing method therefor

A manufacturing method, stainless steel technology, applied in the direction of manufacturing tools, furnaces, heat treatment equipment, etc., can solve problems such as lack of teaching, and achieve the effect of improved swelling resistance and high press workability

Pending Publication Date: 2018-12-21
NIPPON STEEL STAINLESS STEEL CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is no teaching on methods for improving the r-value and swelling resistance of Nb-containing ferritic stainless steel sheets.

Method used

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  • Nb-containing ferritic stainless steel sheet and manufacturing method therefor
  • Nb-containing ferritic stainless steel sheet and manufacturing method therefor
  • Nb-containing ferritic stainless steel sheet and manufacturing method therefor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0069] Steels having the chemical compositions shown in Table 1 were melted by a conventional method to obtain cast slabs (continuously cast slabs). Each slab was heated at the slab heating temperature shown in Table 2 for 120 minutes, extracted, and hot-rolled to form a hot-rolled steel sheet with a thickness of 4.5 mm. The rolling temperature in the final pass of hot rolling is 650 to 700°C, and the coiling temperature is in the range of 500 to 650°C.

[0070] [Table 1]

[0071] Table 1

[0072]

[0073] Samples were taken from each hot-rolled steel sheet, and the amount of Nb-containing precipitates was determined by the electrolytic extraction method according to the above-mentioned "Method for determining the amount of Nb-containing precipitates". In addition, for each hot-rolled steel sheet, a cross-section (L cross-section) parallel to the rolling direction and the plate thickness direction was observed by SEM using Hitachi S-4000. "Precipitation method" to obtain...

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Abstract

The invention simultaneously improves the r value and ridging resistance of an Nb-containing ferritic stainless steel sheet. A ferritic stainless steel raw material sheet for annealing and cold rolling is obtained, the sheet having a chemical composition made, in mass%, of C: 0.004-0.030%, Si: 1.50% or less, Mn: 1.50% or less, P: 0.040% or less, S: 0.010% or less, Cr: 12.0-25.0%, Mo: 0-3.0%, Cu: 0-2.0%, Ni: 0-2.0%, N: 0.005-0.025%, Nb: 0.20-0.80%, Al: 0.10% or less, B: 0-0.0030%, Ti: 00.30% or less, the balance being Fe and unavoidable impurities and the amount of remaining Nb-containing deposits being at least 0.20 mass%. After performing a 900-1100 DEG C annealing on said raw material steel sheet, cold rolling and finish annealing are performed.

Description

technical field [0001] The present invention relates to a hot-rolled steel sheet of ferritic stainless steel containing Nb and a method for producing the same. Moreover, it relates to the manufacturing method of the cold-rolled annealed steel plate which uses this hot-rolled steel plate as a raw material steel plate. Background technique [0002] Ferritic stainless steel containing Nb has good workability by fixing C and N, and is useful for various applications including kitchen components, home appliance components, and building components. In addition, since ferritic stainless steel containing Nb is excellent in high-temperature strength, it is also useful in various heat-resistant applications including automobile exhaust passage members. In recent years, members have become increasingly complex in shape, and ferritic stainless steel sheets containing Nb are required to have excellent workability in order to be able to cope with various press workings. As a characteris...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/00C21D9/46C22C38/54
CPCC21D9/46C22C38/00C22C38/54C21D8/0205C21D8/021C21D8/0226C21D8/0236C21D8/0273C22C38/004C22C38/02C22C38/04C22C38/06C22C38/20C22C38/22C22C38/26C22C38/28C22C38/32C22C38/48C21D2211/004C21D2211/005C22C38/001C22C38/40C21D8/02C22C38/002C22C38/42C22C38/50
Inventor 药师神丰弘中明今川一成
Owner NIPPON STEEL STAINLESS STEEL CORP
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