Ultra high-strength high titanium steel plate with yield strength of 960 MPa and preparing method of same

Abstract

The invention relates to an ultra high-strength high titanium steel plate with yield strength of 960 Mpa and a preparing method of the same. The steel plate is composed of following components: C 0.06 to 0.09%, Si 0.10 to 0.50%, Mn 1.00 to 1.60%, P smaller than 0.015%, S smaller than 0.005%, Cr 0.20 to 0.50%, Mo 0.15 to 0.30 %, Nb 0.02 to 0.05%, Ti 0.06 to 0.20%, B 0.0005 to 0.003%, Cu not larger than 0.10%, Al 0.01 to 0.05%, N smaller than 0.005%, O smaller than 0.003%, Ni 0 to 0.30%, and the rest is Fe and unavoidable impurities. The preparing method comprises smelting and casting, continuous casting billet heating, two-stage rolling and a tempering treatment. The ultra high-strength high titanium steel plate has a good toughness and a good cold bending performance.

Description

technical field [0001] The invention relates to an ultra-high-strength high-titanium steel plate with a yield strength of 960MPa and a manufacturing method thereof, belonging to the technical field of alloy steel manufacturing. Background technique [0002] The ultra-high-strength steel plate with a yield strength of 960MPa has been widely used in structural parts of construction machinery, which has played an important role in improving equipment efficiency, reducing energy consumption and reducing self-weight, and adapts to the continuous development of construction machinery in the direction of high parameterization, large-scale and light weight requirements. [0003] At present, the mainstream production process of 960MPa grade steel plate is off-line quenching and tempering treatment, that is, off-line quenching and tempering after hot rolling, mainly using the precipitation of carbides in martensite to adjust the comprehensive mechanical properties such as strength, to...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is: to overcome the problems existing in the prior art, to provide an ultra-high strength high titanium steel plate with a yield strength of 960MPa and its manufacturing method. The design of the alloy can reduce the alloying cost of the steel plate and improve the performance of the steel plate. On the other hand, the controlled rolling and online quenching process is adopted in the manufacturing method to overcome the shortcomings of the traditional quenching and tempering process such as long process and high energy consumption, so as to simplify and control the process. process to produce high-strength steel plates with good toughness and cold-formability

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