Sheet of steel a double phase has excellent formability of the edges by drawing and method of manufacture that - ci

摘要

Two-phase steel sheet with excellent heat hardening and formability properties contains, by wt.: (a) C : 0.01 - 0.20 %; (b) Si : 0.5 % or less; (c) Mn : 0.3 - 3 %; (d) Soluble Al : 0.06 % or less (including 0 %); (e) P : 0.15 % or less (to the exclusion of 0 %); (f) S : 0.02 % or less (including 0 %). in which the matrix phase contains tempered martensite, tempered martensite and ferrite, tempered bainite or tempered bainite and ferrite and the second phase incorporates 1 - 30 % of martensite with respect to the surfaces on the base of the entire structure. An Independent claim is also included for the method of fabrication of this two-phase steel sheet.