Martensitic stainless steel and method for manufacturing same

Details Martensitic stainless steel and method for manufacturing same Martensitic stainless steel and method for manufacturing same

2003-05-23

2010-02-16

King, Roy (Department: 1793)

Metal treatment

Stock

Ferrous

Reexamination Certificate

active

07662244

ABSTRACT:
A martensitic stainless steel provided includes C: 0.01-0.1% and Cr: 9-15%, and the retained austenite phase has a thickness not more than 100 nm in such a manner that the X-ray integral intensities of 111γ and 110α satisfy the following formula (a):in-line-formulae description="In-line Formulae" end="lead"?0.005≦111γ/(111γ+110α)≦0.05  (a)in-line-formulae description="In-line Formulae" end="tail"?Such a metal structure can be obtained by the following procedure: the steel is heated at a temperature of the Ac3point or more, and then cooled from 800° C. to 400° C. at a cooling rate of not less than 0.08° C./sec and further cooled down to 150° C. at a cooling rate of not more than 1° C./sec. The martensitic stainless steel according to the present invention has a relatively high carbon content and a greater toughness in spite of a high mechanical strength, and further exhibits an excellent corrosion resistance, so that it is particularly effective as the material for constructing a deep oil well.

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