980mpa light-weight and fine-grained phase-transformation-induced plasticity steel and its preparation process

Abstract

The invention relates to transformation induced plastic steel with 980 MPa grade light fine grains. The steel is prepared from the following chemical components in percentage by weight: 0.6-1.2% of C,0.1-0.3% of Si, 1-3% of Mn, less than or equal to 0.02% of P, less than or equal to 0.03% of S, 8.0-13.0% of Al, 0.03-0.3% of Nb, 0.03-0.3% of Ti, 0.05-0.9% of Mo and the balance Fe and inevitable impurities. Compared with the prior art, the steel provided by the invention has the beneficial effects that by adopting a hot rolling-cold rolling-continuous annealing production process, fine grain transformation induced plastic steel, the tensile strength of which is greater than 980 MPa, the elongation of which is greater than 30% and the density of which is lower than 7.1 g / cm<3>, is produced on a conventional production line. The steel is low in cost and excellent in performance and can meet the punching demands of complex automobile parts.

Description

technical field [0001] The invention relates to the field of steel manufacturing for automobiles, in particular to a 980MPa-level, light-weight, fine-grained phase-change-induced plastic steel plate and a manufacturing method thereof. The steel type is suitable for manufacturing automotive structural parts, safety parts, anti-collision parts, etc. . Background technique [0002] At present, with the improvement of energy saving, emission reduction and safety performance requirements, automotive steel is developing towards higher strength and higher elongation. The elongation of traditional automotive steel decreases with the increase of strength, especially when the tensile strength of the steel plate reaches 980MPa, the elongation decreases more obviously. [0003] Patent CN102181788A discloses an ultra-high-strength steel with a yield strength of 1100MPa-1200MPa and its production method. When the tensile strength reaches 1250MPa-1340MPa, the elongation is only 11%-13.5%,...

AI Technical Summary

Problems solved by technology

The disadvantage is that the formability is difficult to meet the needs of automobile factories

[0006] Patent CN 102134680 A discloses a super-high-strength steel with a yield strength of 960MPa and its production method. The steel has a yield strength of more than 960MPa, a tensile strength of more than 1000MPa, and an elongation of 12.5% ​​to 15.5%. Meet the forming needs of complex parts in automobile factories

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