High-strength hot-rolled Q and P steel and manufacturing method thereof

A manufacturing method and high-strength technology, applied in the field of wear-resistant steel manufacturing, can solve the problems of low tensile strength and low strength of steel plates, and achieve the effects of improved mechanical properties, low production costs, and reduced alloy costs
CN103805869AActive Publication Date: 2014-05-21BAOSHAN IRON & STEEL CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
BAOSHAN IRON & STEEL CO LTD
Publication Date
2014-05-21

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Abstract

The invention discloses a high-strength hot-rolled Q and P steel and a manufacturing method thereof. The high-strength hot-rolled Q and P steel contains the chemical components in percentage by weight: 0.20-0.50% of C, 0.8-2.0% of Si, 1.5-3.0% of Mn, less than or equal to 0.015% of P, less than or equal to 0.005% of S, 0.02-0.08% of Al, less than or equal to 0.006% of N, 0.005-0.015% of Ti, 0.5-1.5% of Cr and the balance of Fe and unavoidable impurities. On the basis of the traditional C-Mn steel components, the content of Si is increased to inhibit the separation of a cementite, a trace of Ti is added to control the size of an austenite grain during heating, so that fine lath martensite is obtained during quenching; and a certain quantity of Cr element is added to improve the hardenability of a steel plate and delay the conversion from a residual austenite to a bainite at a distribution stage, so that the high-strength hot-rolled wear-resistant steel is manufactured at low cost, and the steel has the tensile strength of greater than 1500MPa and favorable elongation of greater than 10% and is excellent in strength and plasticity matching.
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Description

technical field

[0001] The invention belongs to the field of wear-resistant steel manufacture, and particularly relates to a high-strength hot-rolled Q&P steel and a manufacturing method thereof. The tensile strength is >1500MPa, and the elongation is >10%. Background technique

[0002] Quenching-partitioning steel, or Q&P steel, has been a research hotspot in the field of high-strength steel in the last ten years.

[0003] At present, Q&P steel has been recognized as the third generation of advanced high-strength steel in the field of automotive steel. The main process of Q&P steel is: heating the steel to the complete austenitic region or partial austenitic region, and after homogenizing for a period of time, it is rapidly quenched to M s and M f (M s and M f Respectively represent a certain temperature between the martensite transformation start temperature and the end temperature) to obtain a martensite + retained austenite structure with a certain amount of re...

Claims

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