Method of manufacturing martensitic stainless steel

Details Method of manufacturing martensitic stainless steel Method of manufacturing martensitic stainless steel

2011-03-15

2011-03-15

Yee, Deborah (Department: 1733)

Metal treatment

Process of modifying or maintaining internal physical...

Heating or cooling of solid metal

C148S608000, C148S653000, C148S662000, C148S663000, C148S664000, C148S503000, C148S506000

Reexamination Certificate

active

07905967

ABSTRACT:
The occurrence of delayed fracture which is found in a hot worked martensitic stainless steel is prevented by subjecting the steel, after hot working and prior to heat treatment for hardening by quenching from a temperature of at least Ac1point of the steel, to preliminary softening heat treatment under such conditions that the softening parameter P defined below is at least 15,400 and the softening temperature T is lower than the Ac1point:in-line-formulae description="In-line Formulae" end="lead"?P(softening parameter):P=T(20+logt)in-line-formulae description="In-line Formulae" end="tail"?T: softening temperature [K]t: duration of softening treatment [Hr].The present invention is particularly effective for a martensitic stainless steel having a steel composition in which the amount of effective dissolved C and N (=[C*+10N*]) where C* and N* are calculated by the following formulas is larger than 0.45:in-line-formulae description="In-line Formulae" end="lead"?C*=C−[12{(Cr/52)×(6/23)}/10, andin-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?N*=N−[14{(V/51)+(Nb/93)}/10]−[14{(Ti/48)+(B/11)+(Al/27)}/10].in-line-formulae description="In-line Formulae" end="tail"?

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Machine-English translation of Japanese patent 2003-105441, Yukio Miyata et al. Apr. 9, 2003.

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