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1000MPa-level automobile steel with high product of strength and elongation and manufacturing method thereof

A technology of high-strength plastic product and manufacturing method, which is applied to high-strength plastic-product automotive steel and its manufacturing field of 1000 MPa level, can solve the problems such as the inability to realize continuous annealing production.

Active Publication Date: 2012-10-31
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The continuous annealing line design of each steel plant is not the same, but in general, when the annealing time is greater than 10min, industrial continuous annealing production can no longer be realized

Method used

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  • 1000MPa-level automobile steel with high product of strength and elongation and manufacturing method thereof
  • 1000MPa-level automobile steel with high product of strength and elongation and manufacturing method thereof
  • 1000MPa-level automobile steel with high product of strength and elongation and manufacturing method thereof

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Embodiment Construction

[0031] Manufacture the high-strength plastic product automobile steel of the present invention according to the following steps:

[0032] (1) Smelting the chemical elements in the ratio shown in Table 1, using a converter (electric furnace or induction furnace can also be used for smelting);

[0033] (2) Continuous casting to produce slabs;

[0034] (3) Hot rolling: heating the slab to 1100~1250°C and then controlling rolling, the starting rolling temperature is 950~1150°C, the final rolling temperature is 750~900°C, and the thickness of the hot rolled plate is not more than 8mm;

[0035] (4) Coil at 500~700°C after rolling, and the structure is full martensite after cooling to room temperature;

[0036] (5) Pickling to remove iron oxide scale generated during hot rolling;

[0037] (6) Bell furnace annealing: the annealing temperature is 600~700°C, between Ac1 and Ac3 temperatures, the annealing time is not less than 15 hours, and part of the austenite structure is obtained af...

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Abstract

The invention discloses a 1000MPa-level automobile steel with high product of strength and elongation and a manufacturing method thereof. The automobile steel comprises the following chemical components in percentage by mass: 0.11-0.30% of C, 0.1-2.0% of Si, 5-10% of Mn, at most 0.02% of P, at most 0.02% of S, 0.01-2.0% of Al, at most 0.02% of N, and the balance of Fe and other inevitable impurities. Correspondingly, the invention also discloses a manufacturing method of the automobile steel, which comprises the following steps: smelting, casting, hot rolling, coiling, cover annealing, cold rolling and continuous annealing. The tensile strength of the automobile steel is greater than 1000MPa, and the product of strength and elongation is greater than or equal to 30GPa%; the automobile steel has high strength and high elongation percentage; and the manufacturing method is simple and easy to control, and is suitable for routine mass production for steel enterprises.

Description

technical field [0001] The invention relates to steel grades in the field of metallurgy and a manufacturing method thereof, in particular to a steel for automobiles and a manufacturing method thereof. Background technique [0002] With the increasing demand for "lightweight" automobiles, ultra-high-strength steel plates are increasingly being used in automotive structural parts. At present, the steel plates used in large quantities include dual-phase steel, martensitic steel, TRIP steel, and multi-phase steel. The product of length) is about 20GPa% at most. For example, TRIP steel with the best strength and plasticity has an elongation of about 26% when its strength level is 800MPa, while ultra-high-strength martensitic steel has an elongation of only about 10% when its tensile strength reaches 1000MPa. , which cannot meet the dual requirements of the automobile field for the strength of the automobile safety performance and the formability during the manufacturing process...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/06C21D8/02
Inventor 张玉龙王华洪继要王利
Owner BAOSHAN IRON & STEEL CO LTD
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