1000mpa-grade high hole expansion hot-rolled complex phase steel plate and manufacturing method thereof

Abstract

Disclosed are a 1000 MPa-grade high hole expansion hot-rolled complex phase steel plate and a manufacturing method thereof. The steel plate contains Fe and unavoidable impurity elements, and further contains the following chemical elements in mass percent: C: 0.07-0.15%, Si: 0.1-0.8%, Mn: 1.5-2.2%, Al: 0.02-0.1%, Ti: 0.05-0.18%, Nb≤0.06%, B≤0.003%, and at least one of 0.2%≤Cr≤1.5% and 0.05%≤Mo≤0.5%; wherein the mass percent content of N, Ti and Nb additionally satisfies: 0.01%≤(Ti−3.43N+0.52Nb)/4≤0.053%. The 1000 MPa-grade high hole expansion hot-rolled complex phase steel plate can be used in automobile chassis and structural parts and satisfies the technical requirements for complex automobile component flanging and stamping and automobile lightening.

Dependencies are inferred from the claim text.