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Austenitic high mn stainless steel excellent in workability

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

Active Publication Date: 2006-06-14
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

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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 the JIS13B tensile test piece from the annealed and pickled material, and measure the 0.2% endurance, tensile strength, elongation, and work hardening index n by tensile test. The work hardening exponent n is to obtain the actual strain ε corresponding to 25% and 35% of th...

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Abstract

The present invention aims to provide an austenitic stainless steel that improves the workability of high-Mn stainless steel and maintains non-magnetic properties after processing, and includes C+N: 0.03 to 0.15% and Si: 0.1% by mass. ~1%, Mn: 3~15%, Cr: 10~16%, Ni: 1~6%, Cu: 0.3~3%, Mo: 0.3~3%, the rest is Fe and unavoidable impurities, And the composition design is carried out in such a way that the index Md30 value of austenite stability and the generation index SFE of lamination defect energy meet the following conditions: -10<Md30<30, 40<SFE<80Md30 (°C): 497-462 (C+ N)-9.2Si-8.1Mn-13.7Cr-20 (Ni+Cu)-18.5MoSFE [mJ / m2]: 6.2Ni+18.6Cu+0.7Cr+3.2Mn+9.3Mo-53.

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 Applications(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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