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Hot rolled Q&P steel with 700MPa grade yield strength and ultralow yield ratio and manufacturing method thereof

A technology of yield strength and manufacturing method, which is applied in the field of wear-resistant steel, can solve the problems of difficult realization of ferrite, design of alloy composition without micro-Ti treatment, low strength, etc., and achieve the effect of improving thermal stability

Inactive Publication Date: 2016-03-30
BAOSHAN IRON & STEEL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Chinese patent CN102226248A introduces a carbon-silicon-manganese hot-rolled Q&P steel, but the alloy composition design does not carry out micro-Ti treatment; patent CN101775470A introduces a complex phase Q&P The production process of steel is actually a two-step process for producing Q&P steel
[0005] 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
Therefore, it is difficult to obtain a certain amount of ferrite by reducing the finishing temperature in the actual production of hot rolling.

Method used

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  • Hot rolled Q&P steel with 700MPa grade yield strength and ultralow yield ratio and manufacturing method thereof
  • Hot rolled Q&P steel with 700MPa grade yield strength and ultralow yield ratio and manufacturing method thereof
  • Hot rolled Q&P steel with 700MPa grade yield strength and ultralow yield ratio and manufacturing method thereof

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Embodiment Construction

[0048] The present invention will be further described below in conjunction with the embodiments and accompanying drawings.

[0049] see figure 1 , figure 2 , the manufacture method of the ultra-low yield strength ratio hot-rolled Q&P steel of yield strength 700MPa grade of the present invention, comprises the steps:

[0050] 1) Smelting and casting

[0051] Converter or electric furnace smelting, vacuum furnace secondary refining, casting into slabs or ingots according to the following composition;

[0052] 2) Reheating of billet or ingot, heating temperature: 1100-1200°C, holding time: 1-2 hours;

[0053] 3) hot rolling

[0054] 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 and Cumulative deformation ≥ 70%;

[0055] 4) Sectional cooling

[0056] Rapidly water-cool at a cooling rate of >50°C / s to 600-700°C above ...

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Abstract

The invention relates to a hot rolled Q&P steel with 700MPa grade yield strength and ultralow yield ratio and a manufacturing method thereof. The hot rolled Q&P steel comprises the following components by weight: 0.2-0.3% of C, 1.0-2.0% of Si, 1.5-2.5% of Mn, less than or equal to 0.015% of P, less than or equal to 0.005% of S, 0.5-1.0% of Al, or less than or equal to 0.006% of N, 0.05-0.5% of Cr, less than or equal to 0.05% of Ti, and the balance Fe and inevitable impurities. The ultrahigh strength hot rolled Q&P steel provided by the invention has yield strength of greater than or equal to 700MPa and tensile strength of greater than or equal to 1300MPa.

Description

technical field [0001] The invention belongs to the field of wear-resistant steel, and in particular relates to ultra-low yield ratio hot-rolled Q&P steel with a yield strength of 700MPa and a manufacturing method thereof. Background technique [0002] Quenching-partitioning steel, or Q&P steel, has been a research hotspot in the field of high-strength steel in the past ten years. Its main purpose is to improve the plasticity of steel while improving the strength of steel, that is, to increase the strength-plastic product of steel. At present, Q&P steel has been recognized as an important new steel type in 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 tran...

Claims

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Application Information

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IPC IPC(8): C22C38/38C21D8/02
Inventor 王焕荣杨阿娜王巍张华伟杨晓臻
Owner BAOSHAN IRON & STEEL CO LTD
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