Duplex stainless steel plate having excellent press moldability

A duplex stainless steel, stamping formability technology, applied in the furnace type, furnace, heat treatment furnace, etc., can solve problems such as unclear, and achieve the effect of saving Ni

Active Publication Date: 2012-02-15
NIPPON STEEL & SUMIKIN STAINLESS STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In other words, the status quo is that among Ni-saving duplex stainless steels, it is not clear which steel sheet can be press-formed not inferior to austenitic stainless steel sheets such as SUS304.

Method used

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  • Duplex stainless steel plate having excellent press moldability
  • Duplex stainless steel plate having excellent press moldability
  • Duplex stainless steel plate having excellent press moldability

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0094] Hereinafter, examples of the present invention will be described.

[0095] Duplex stainless steel having the composition shown in Table 3 was melted and hot-rolled to produce a hot-rolled sheet having a sheet thickness of 4.0 to 5.0 mm. Steel No. 1 to Steel No. 22 have the components and Ni-bal. specified in the present invention. Steel Nos. 23 and 24 have the composition specified in the present invention, but Ni-bal. deviates from the present invention. Steel Nos. 25 to 27 have Ni-bal. specified in the present invention, but the composition range deviates from the present invention. After these hot-rolled sheets were annealed and pickled, they were cold-rolled to a thickness of 0.7 mm, and final annealed at 1050°C.

[0096] table 3

[0097]

[0098] Ni-bal.=30(C+N)+0.5Mn+0.3Cu+Ni-1.1(Cr+1.5Si)+8.2

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Abstract

Disclosed is a duplex stainless steel plate having excellent press moldability, in which the balance between steel components and Ni and the austenite phase fraction are defined so as to show a 0.2% stress and an Erichsen value similar to those of austenitic stainless steels such as SUS 304. The duplex stainless steel plate contains 0.05 % by mass or less of C, 0.5 to 3% by mass of Si, 1 to 5% by mass of Mn, 16 to 21% by mass of Cr, 1 to 6% by mass of Ni, 0.5 to 3% by mass of Cu and 0.07% by mass or less of N, and has a Ni-bal. value determined in accordance with formula <1> shown below of -7.5 to -3.5 inclusive, with the remainder being Fe and unavoidable impurities. The duplex stainless steel plate has an austenite phase fraction of 50 to 95% inclusive, with the remainder being a ferrite phase. Ni-bal. = 30(C+N) + Ni + 0.5Mn + 0.3Cu - 1.1(Cr+1.5Si) + 8.2 <1>

Description

technical field [0001] The present invention relates to a duplex stainless steel sheet excellent in press formability represented by bulging formability. Background technique [0002] Austenitic stainless steel represented by SUS304 has been used in a wide range of processing applications such as kitchen equipment, home appliances, and electronic equipment because of its excellent balance between corrosion resistance and workability. Generally speaking, compared with ferritic stainless steel or duplex stainless steel, austenitic stainless steel has a very high fracture elongation and excellent bulging formability, and is mostly suitable for stamping of steel plates. However, since austenitic stainless steel contains a large amount of rare and expensive Ni, there are problems in its popularity and economical efficiency in the future. [0003] Duplex stainless steel with reduced Ni content has been known for a long time as a substitute for austenitic stainless steel. In Pate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/00C22C38/58C22C38/60
CPCC21D6/004C21D8/0236C21D9/46C21D2211/001C21D2211/005C22C38/001C22C38/34C22C38/42C22C38/58Y10T428/12229C22C38/008C22C38/60
Inventor 秦野正治高桥明彦石丸咏一朗木村谦
Owner NIPPON STEEL & SUMIKIN STAINLESS STEEL CORP
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