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Austenitic high mn stainless steel excellent in workability

A technology with excellent machinability and stainless steel, applied in the field of austenitic high Mn stainless steel

Active Publication Date: 2008-03-05
NIPPON STEEL & SUMIKIN STAINLESS STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

That is, in the current situation, there is no high-Mn stainless steel that has the same or better workability as SUS304 and achieves non-magnetism after processing.

Method used

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  • Austenitic high mn stainless steel excellent in workability
  • Austenitic high mn stainless steel excellent in workability
  • Austenitic high mn stainless steel excellent in workability

Examples

Experimental program
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Embodiment

[0047] Stainless steel having the chemical composition shown in Table 1 was smelted and hot-rolled at a heating temperature of 1200° C. to produce a hot-rolled steel sheet with a thickness of 4.0 mm. The hot-rolled steel sheet is annealed at 1120°C with a soaking time of 2 minutes, cold-rolled to a plate thickness of 1.5 mm after pickling, and then intermediate annealed at 1060°C with a soaking time of 2 minutes. After pickling, the plate thickness is 0.7 mm. mm of cold-rolled steel sheet, and perform final annealing (annealing pickling material) at 1060°C and soaking time for 1 minute. A 60% cold rolled material was obtained by cold rolling the intermediate annealed pickled material to 0.6 mm.

[0048] Cut out JIS13B tensile test pieces from the annealed and pickled materials, and measure 0.2% yield strength, tensile strength, elongation, and work hardening exponent n by tensile testing. The work hardening exponent n is to obtain the actual strain ε corresponding to 25% and ...

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Abstract

An austenitic high Mn stainless steel excellent in wokability, characterized in that it has a chemical composition, in mass %, C + N: 0.03 to 0.15 %, Si: 0.1 to 1 %, Mn: 3 to 15 %, Cr: 10 to 16 %, Ni: 1 to 6 %, Cu: 0.3 to 3 %, Mo: : 0.3 to 3 %, and the balance: Fe and inevitable impurities, and the chemical composition is so designed that Md30, which is an indicator for the stability degree of austenite, and SFE, which is an indicator for the formation of stacking fault energy, satisfy the following formulae: -10 < Md30 < 30, and 40 < SFE < 80, Md30 ( DEG C): 497-462(C+N)-9.2Si-8.1Mn-13.7Cr-20(Ni+Cu)-18.5Mo SFE (mJ / m<2>): 6.2Ni+18.6Cu+0.7Cr+3.2Mn+9.3Mo-53. The above austenitic high Mn stainless steel is improved in workability and retains non-magnetism also after being worked.

Description

technical field [0001] The present invention relates to an austenitic high-Mn stainless steel that is soft and has low work hardening, has good workability that allows press forming such as cold working and deep drawing at a high working rate, and can maintain nonmagnetic properties even after working. Background technique [0002] Austenitic stainless steel includes 300 series (SUS304, SUS316, SUS301, etc.) and 200 series (SUS201, SUS202, etc.) specified in JISG4305. [0003] 300-series austenitic stainless steel contains 2.0% by mass or less of Mn and about 6 to 15% by mass of Ni. Ni-based austenitic stainless steel represented by SUS304 has good workability and good corrosion resistance, but has a disadvantage of high raw material cost because it contains a large amount of expensive Ni. In addition, since the austenite phase is metastable in SUS304, there is a problem that martensitic transformation occurs during forming and the processed product becomes magnetic. [00...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/00C22C38/58
Inventor 秦野正治石丸永一朗高桥明彦
Owner NIPPON STEEL & SUMIKIN STAINLESS STEEL CORP
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