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A kind of 800mpa grade high yield strength ratio cold-rolled dual-phase steel and its preparation method

A high yield ratio, dual-phase steel technology, applied in the field of cold-rolled dual-phase steel, can solve the problems that dual-phase steel cannot be provided, achieve low cost, improve comprehensive mechanical properties, and reduce the effect of uneven microstructure of finished products

Active Publication Date: 2021-06-22
MAANSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] Aiming at the problem that the existing 800MPa dual-phase steel cannot provide high yield ratio cold-rolled dual-phase steel without affecting other properties of the dual-phase steel, the present invention provides an 800MPa grade high-yield ratio cold-rolled dual-phase steel and Its preparation method: the tensile strength of the cold-rolled dual-phase steel is ≥800MPa, the elongation is ≥16%, the steel plate strength and yield strength ratio are high, the extensibility and strength are well matched, and the cold bending and hole expansion performance are excellent at the same time, and the production cost is low. Inexpensive, suitable for market promotion, with good application prospects

Method used

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  • A kind of 800mpa grade high yield strength ratio cold-rolled dual-phase steel and its preparation method
  • A kind of 800mpa grade high yield strength ratio cold-rolled dual-phase steel and its preparation method
  • A kind of 800mpa grade high yield strength ratio cold-rolled dual-phase steel and its preparation method

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preparation example Construction

[0057] A kind of preparation method of 800MPa level high yield ratio cold-rolled dual-phase steel of the present invention comprises the following steps:

[0058] S1. Steel smelting and solidification to obtain cast slabs or ingots: steel smelting and solidification are suitable for converter, electric furnace and induction furnace smelting, using continuous casting to produce slabs or die casting to produce ingots, during the continuous casting or die casting process Electromagnetic stirring is used.

[0059] S2. Continuous hot rolling of slab or ingot: heat the slab or ingot to a temperature range of 1180-1260°C, roll the slab or ingot for 5-10 passes by a rough rolling mill, and cast the slab or ingot after rough rolling The thickness of the billet or ingot is 30-50mm, and then rolled by the hot continuous rolling mill for 5-7 passes. After rolling to the required thickness, it is coiled into a steel coil within the temperature range of T1, and the temperature range of T1 i...

Embodiment 1

[0065] An 800MPa grade high yield ratio cold-rolled dual-phase steel in this embodiment has main chemical components and weight percentages as shown in Example 1 in Table 1, wherein P≤0.02%, S≤0.01%.

[0066] The preparation method of a kind of 800MPa grade high yield strength ratio cold-rolled dual-phase steel of this embodiment comprises the following steps:

[0067] S1. Steel smelting and solidification to obtain cast slabs or ingots: steel smelting and solidification are suitable for converter, electric furnace and induction furnace smelting, using continuous casting to produce slabs or die casting to produce ingots, during the continuous casting or die casting process Electromagnetic stirring is used.

[0068] S2. Continuous hot rolling of slab or ingot: heating the slab or ingot to a temperature range of 1180°C, rolling the slab or ingot for 5 passes by the rough rolling mill, and casting the slab or ingot after rough rolling The thickness is 30mm, and then rolled by th...

Embodiment 2

[0072] An 800MPa grade high yield ratio cold-rolled dual-phase steel in this embodiment has main chemical components and weight percentages as shown in Example 2 in Table 1, wherein P≤0.02%, S≤0.01%. The process parameter of the duplex steel preparation method of the present embodiment is with reference to embodiment 1, as follows:

[0073] The preparation method of a kind of 800MPa grade high yield strength ratio cold-rolled dual-phase steel of this embodiment comprises the following steps:

[0074] S1. Steel smelting and solidification to obtain cast slabs or ingots: steel smelting and solidification are suitable for converter, electric furnace and induction furnace smelting, using continuous casting to produce slabs or die casting to produce ingots, during the continuous casting or die casting process Electromagnetic stirring is used.

[0075] S2. Continuous hot rolling of slab or ingot: heating the slab or ingot to a temperature range of 1180°C, rolling the slab or ingot ...

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Abstract

The invention discloses a cold-rolled dual-phase steel with a high yield strength ratio of 800MPa and a preparation method thereof, belonging to the field of cold-rolled dual-phase steel. It includes C: 0.08‑0.10%, Si: 0.6‑0.8%, Mn: 1.8‑2.0%, Cr: 0.6‑0.8%, Als: 0.03‑0.06%, Nb: 0.04‑0.06%, P≤0.02%, S ≤0.01%, the balance is Fe and unavoidable impurities. The present invention can make the isotropic properties of the dual-phase steel tend to be the same by adding point-like bainite to the ferrite in the dual-phase of ferrite and martensite under the condition of relatively low carbon content, and at the same time It also maintains good mechanical properties, and can meet the needs of high yield ratio dual-phase steel. It is reasonable in design and easy to put into production.

Description

technical field [0001] The invention belongs to the field of cold-rolled dual-phase steel, and more specifically relates to a cold-rolled dual-phase steel with a high yield ratio of 800 MPa and a preparation method thereof. Background technique [0002] With the development of automobile lightweight and the improvement of comprehensive performance requirements for automobile materials, automobile steel has experienced the development of low-alloy high-strength steel, phosphorus-containing high-strength IF steel, dual-phase steel, and TRIP steel. accumulation is continuously increasing. Ferrite / martensitic dual-phase steel with dual-phase structure is a representative of high-strength steel with phase transformation strengthening. It will play an important role in the development of the automobile industry in the future. Studies have shown that the amount of dual-phase steel used in future automobile bodies will reach 80%, and it has broad application prospects. The applica...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C33/04B22D11/115C21D1/26C21D6/00C21D8/02C21D9/573C22C38/02C22C38/06C22C38/26C22C38/38C23G1/08C23G3/02
Inventor 詹华肖洋洋刘永刚崔磊马明璐冷德平郑笑芳张露星景宏亮杨少华黄冉熊华报
Owner MAANSHAN IRON & STEEL CO LTD
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