Austenitic stainless steel

Details Austenitic stainless steel Austenitic stainless steel

2006-09-05

2006-09-05

Ip, Sikyin (Department: 1742)

Metal treatment

Stock

Ferrous

C420S043000, C420S049000, C420S050000

Reexamination Certificate

active

07101446

ABSTRACT:
An austenitic stainless steel with minimized deformation by heating and cooling treatment after cold working, which consists of, % by mass, C: 0.03% or less, Si: 2 to 4%, Mn: 0.1 to 2%, P: 0.03% or less, S: 0.03% or less, Ni: 9 to 15%, Cr: 15 to 20%, N: 0.02 to 0.2%, Nb: 0.03% or less, each of Mo and Cu or a total of Mo and Cu: 0.2 to 4%, and the balance Fe and impurities, and satisfies the following formulas (1) and (2). This steel can also have good weldability when the following formula (3) is also satisfied in addition to the formulas (1) and (2);in-line-formulae description="In-line Formulae" end="lead"?16.9+6.9Ni+12.5Cu−1.3Cr+3.2Mn+9.3Mo−205C−38.5N−6.5Si−120Nb≧40  (1)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?450−440(C+N)−12.2Si−9.5Mn−13.5Cr−20(Cu+Ni)−18.5Mo≦−90  (2)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?8.2+30(C+N)+0.5Mn+Ni−1.1(1.5Si+Cr+Mo)+2.5Nb≦−0.8  (3)in-line-formulae description="In-line Formulae" end="tail"?wherein each element symbol in the formulas (1), (2) and (3) represents the content, % by mass, of each element included in the steel.

REFERENCES:
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H. Aoyama, “Contraction of Cold Rolled Austenitic Stainless Steels during Annealing at Low Temperature”, CAMP-ISIJ vol. 15 (2000)-559.
H. Aoyama, “Contraction of Cold Rolled Austenitic Stainless Steels during Annealing at Low Temperature”, Tetsu To Hagane, vol. 81 (1995), No. 5, pp. 65-70.
H. Aoyama, “Effect of Applied Stress on Flatness of Cold Rolled Austenitic Stainless Steels during Low Temperature Annealing”, Tetsu To Hagane, vol. 81 (1995), No. 9, pp. 32-37.
H. Aoyama, “Contraction of Cold Rolled Austenitic Stainless Steels Induced by Leveling”, Tetsu To Hagane, vol. 92 (1996), No. 10, pp. 37-42.

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