Process for manufacturing bake hardening steel sheet, and...

Details Process for manufacturing bake hardening steel sheet, and... Process for manufacturing bake hardening steel sheet, and...

2003-10-10

2009-06-02

Yee, Deborah (Department: 1793)

Metal treatment

Stock

Ferrous

C148S320000, C148S603000, C148S651000, C148S652000

Reexamination Certificate

active

07540928

ABSTRACT:
The invention concerns a method for making hardenable steel plates by firing comprising: preparing a steel whereof the composition comprises, expressed in weight percent: 0.03=C=0.06, 0.50=Mn=1.10, 0.08:=Si=0.20, 0.015=Al=0.070, N=0.007, Ni=0.040, Cu=0.040, P=0.035, S=0.015, Mo=0.010, Ti=0.005; provided that it comprises boron in an amount such that 0.64=B/N=1.60 the rest consisting of iron and impurities resulting from production; casting a slab of said steel, then hot rolling of said slab to obtain a plate, the final rolling temperature being higher than the point Ar3; winding said plate at a temperature ranging between 500 and 700° C.; then cold rolling of said plate at a reduction rate ranging between 50 and 80%; continuous annealing heat treatment for a time interval less than 15 minutes; and strain hardening with a reduction rate ranging between 1.25 and 2.5%. The invention also concerns the hardenable plates and the parts obtainable therefrom.

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International Search Report for PCT/FR03/002985 dated Mar. 24, 2004.

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