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

Active Publication Date: 2014-05-21
BAOSHAN IRON & STEEL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Chinese patent CN102226248A introduces a carbon-silicon-manganese hot-rolled Q&P steel, but the design of the alloy composition does not carry out micro-Ti treatment and add Cr element, and the tensile strength of the steel plate is obviously lower than 1400MPa
Chinese patent CN101487096A introduces a two-step heat treatment method to produce C-Mn-Al series Q&P steel, its main feature is high elongation, but low strength

Method used

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

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Embodiment Construction

[0044] The present invention will be further described below in conjunction with the accompanying drawings.

[0045] see figure 1 , the process flow of the present invention: smelting in a converter or an electric furnace, secondary refining in a vacuum furnace, and casting into billets or ingots; heating, billet or ingot heating temperature: 1100~1200°C, holding time: 1~2 hours; rolling, Rolling start temperature: 1000~1100°C, multi-pass high pressure above 950°C and cumulative deformation ≥ 50%, then the intermediate billet is heated to 900~950°C, and then rolled for the last 3~5 passes; Cooling, above the starting temperature of ferrite precipitation, that is, between 850 and 900 °C, cooling to 100 to 300 °C at a cooling rate of >50 °C / s to obtain martensite + 5% retained austenite structure, and finally Slowly cool to room temperature after coiling.

[0046] The composition of the embodiment of the present invention is shown in Table 1, and the process and performance ar...

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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.

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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/38
Inventor 李自刚王焕荣王巍李建业
Owner BAOSHAN IRON & STEEL CO LTD
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