Austenitic stainless steel having superior press-formability, ho

Details Austenitic stainless steel having superior press-formability, ho Austenitic stainless steel having superior press-formability, ho

1995-04-19

1996-11-05

Yee, Deborah

Metal treatment

Stock

Ferrous

148610, C22C 3840, C21D 800

Patent

active

055713432

ABSTRACT:
An austenitic stainless steel and a manufacturing process therefor are disclosed, in which, instead of the expensive Ni, there are added Cu as an austenite (.tau.) stabilizing element, and tiny amounts of Ti as a ferrite forming element and B for improvement of high temperature hot workability, so that the optimum Md.sub.30 temperature and the optimum delta-ferrite content can be controlled, thereby improving the formability, the season cracking resistance, the hot workability and the high temperature oxidation resistance, and reducing the surface defects during the hot rolling and saving the manufacturing cost by reducing the content of Ni. The austenitic stainless steel according to the present invention includes in weight %: less than 0.07% of C, less than 1.0% of Si, less than 2.0% of Mn, 16-18% of Cr, 6.0-8.0% of Ni, less than 0.005% of Al, less than 0.05% of P, less than 0.005% of S, less than 0.03% of Ti, less than 0.003% of B, less than 3.0% of Cu, less than 0.3% of Mo, less than 0.1% of Nb, less than 0.045% of N, the balance of Fe, and other indispensable impurities. Thus the present invention improves the press formability, the season cracking resistance, the hot workability, and the high temperature oxidation resistance.

REFERENCES:
patent: 3282684 (1966-11-01), Allen
patent: 4265679 (1981-05-01), Ohashi et al.
patent: 4849166 (1989-07-01), Hoshino et al.

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