Patent ID: 8882938
Filing Date: 2014-11-11
Classification: B32B,C21D,C22C,C23C,C23F,Y10T

Abstract:
1. High strength hot dip galvanised steel strip consisting, in mass percent, of the following elements: 0.149-0.16% C 1.95-2.2% Mn 0.35-0.45% Si 0.55-0.65% Al 0.30-0.50% Cr 0.001-0.10% P 0.01-0.04% Nb max 0.004% Ca max 0.05% S max 0.007% N; and optionally at least one of the following elements: 0.005-0.50% Ti 0.005-0.50% V 0.005-0.50% Mo 0.005-0.50% Ni 0.005-0.50% Cu max 0.005% B; the balance being Fe and inevitable impurities, wherein 0.80%<Al+Si<1.05% and Mn+Cr>2.10%; wherein the hot dip galvanised steel strip has an ultimate tensile strength of 780 MPa or higher; a uniform elongation above 14%; a total elongation of at least 19.7%; and a BS1140:1993 weldability of being spot-weldable.