Hot rolling high-chambering steel plate with tensile strength of 590 MPa and manufacturing process thereof

Abstract

The invention discloses a hot rolling high-chambering steel plate with the tensile strength of 590 MPa. The steel plate comprises the following chemical compositions in percentage by weight: 0.02-0.10 percent of C, 0-1.6 percent of Si, 0.8-2.0 percent of Mn, smaller than or equal to 0.035 percent of P, smaller than or equal to 0.010 percent of S, 0.025-0.060 percent of Al, smaller than or equal to 0.0060 percent of N, 0-0.10 percent of Nb, 0-0.04 percent of Ti, 0-0.0050 percent of Ca and the balance of Fe and unavoidable impurities. The manufacturing process of the hot rolling high-chambering steel plate comprises the following steps of: heating a steel billet at 1,150-1,250 DEG C, and then rolling in an austenitic area, wherein the rolling deformation is larger than 80 percent, and the finish rolling temperature is 830-900 DEG C; cooling the steel plate after finish rolling to 600-750 DEG C at a cooling speed of 50-100 DEG C / s; cooling for 3-10 seconds in the air at a cooling speed of 5-15 DEG C / s; then cooling the steel plate to 350-500 DEG C at a cooling speed of 70 DEG C / s and reeling; and then cooling in the air to room temperature. The steel plate is particularly suitable for manufacturing a chassis component of a car.

Description

technical field [0001] The invention belongs to the field of metal materials, in particular to iron-based alloys containing C, Si, Mn, Nb, Ti, etc. It is a hot-rolled high-hole-expanding steel plate with a tensile strength above 590 MPa without heat treatment and its manufacturing process. Steel plates are especially suitable for making chassis components of cars. Background technique [0002] In recent years, due to the increasing awareness of human environmental protection, reducing the fuel consumption of cars and reducing CO 2 Emissions have become a common global voice, among the various measures to achieve this goal, vehicle weight reduction is a very effective means. This global trend and the emphasis on automobile safety have brought about the demand for various advanced new steel materials with high strength and good processing performance. [0003] Hot-rolled steel plates are mainly used for car chassis, wheels, suspension and their surrounding parts, and its wei...

AI Technical Summary

Problems solved by technology

[0005] The thickness of high reaming steel is generally not more than 6mm, and the reaming performance of ordinary SAPH carbon-manganese steel plates is often relatively low (≤70%), which cannot meet the formability requirements of some complex-shaped parts of the automobile chassis

Images