High-strength steel and preparation method thereof

A high-strength steel and body technology, applied in the field of high-strength steel and its preparation, can solve problems such as surface pits, unhealthy workers, iron sheet accumulation, etc., and achieve excellent formability and durability

Active Publication Date: 2022-02-11
湖南华菱涟源钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, high-strength steel is prone to produce iron oxide scale during the heating and rolling process, which will cause iron scale accumulation in the subsequent process of leveling and st

Method used

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  • High-strength steel and preparation method thereof
  • High-strength steel and preparation method thereof
  • High-strength steel and preparation method thereof

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preparation example Construction

[0059] Preparation of high-strength steel

[0060] Embodiments of the second aspect of the present invention provide a method for preparing high-strength steel, the method comprising the steps of:

[0061] 1) Carry out heat treatment to billet;

[0062] 2) descaling and rolling, the finish rolling temperature in the rolling is 850-920°C;

[0063] 3) laminar flow cooling, the laminar flow cooling adopts front-end centralized cooling;

[0064] 4) coiling, the coiling temperature is 550~610°C;

[0065] 5) Natural air cooling to obtain the high-strength steel.

[0066] In some embodiments, the heat treatment in step 1) specifically includes heating the steel slab to 1200-1250° C. within 120-180 minutes and keeping it warm for at least 30 minutes.

[0067] It should be noted that the heat treatment in step 1) is specifically to heat the billet to 1200-1250°C within 120-180 minutes, and keep it warm for at least 30 minutes. The purpose is to completely dissolve the microalloyi...

Embodiment 1

[0079] The chemical composition and content of the high-strength steel are: C is 0.08wt%, Mn is 1.48wt%, Si is 0.08wt%, Nb is 0.056wt%, V is 0.05wt%, Ti is 0.10wt%, Cr is 0.12%, S is 0.002wt%, P is 0.011wt%, and the rest is Fe and unavoidable impurities.

[0080] The slab is heated to 1200°C in a heating furnace and held for 3.5 hours, so that the microalloying elements are completely dissolved and form carbonitrides, which hinder the growth of the original austenite grains and refine the grains.

[0081] After the slab is released from the heating furnace, the furnace scale is removed by high-pressure water for coarse descaling. The descaling speed is 1.0m / min, and the descaling pressure is 20MPa.

[0082] The plate after primary descaling is subjected to rough rolling for 5 passes, and then the base number of rough rolling passes for secondary descaling, followed by fine descaling and high-pressure water for 3 times of descaling, and the descaling pressure is 20MPa.

[0083...

Embodiment 2

[0090] The chemical composition and content of high-strength steel are: C is 0.075wt%, Mn is 1.51wt%, Si is 0.12wt%, Nb is 0.045wt%, V is 0.046wt%, Ti is 0.125wt%, Cr is 0.08 %, S is 0.003wt%, P is 0.015wt%, and the rest is Fe and unavoidable impurities.

[0091] The slab is heated to 1220°C in a heating furnace and kept for 3.2 hours, so that the microalloying elements are completely dissolved and form carbonitrides, which hinder the growth of the original austenite grains and refine the grains.

[0092] After the slab is released from the heating furnace, the furnace scale is removed by high-pressure water for coarse descaling. The descaling speed is 1.0m / min, and the descaling pressure is 20MPa.

[0093] After the primary descaling, the slab is rough rolled for 5 passes, and then the base number of rough rolling passes is used for the second descaling, followed by the fine descaling and high pressure water for 3 descaling, and the descaling pressure is 20MPa.

[0094] The ...

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Abstract

The invention provides high-strength steel and a preparation method thereof, and relates to the technical field of steel preparation. The high-strength steel comprises a steel body and mill scale on the surface of the steel body, wherein the steel body comprises, by weight, 0.065%-0.105% of C, 1.45%-1.65% of Mn, 0.07%-0.15% of Si, 0.02%-0.06% of Nb, 0.04%-0.06% of V, 0.09%-0.14% of Ti, 0.07%-0.025% of Cr, less than or equal to 0.005% of S, less than or equal to 0.020% of P and 97.0%-99.0% of Fe; the weight percentage content of Nb, V and Ti meets the condition that the sum of Nb%, V% and Ti% is less than 0.24%; and the mill scale comprises a Fe3O4 + alpha-Fe eutectoid structure, FeO and Fe3O4. The high-strength steel has high strength and excellent plasticity, and surface mill scale powder falling is little.

Description

technical field [0001] The present application relates to the technical field of steel preparation, in particular to a high-strength steel and a preparation method thereof. Background technique [0002] As the automotive industry has higher and higher requirements for safety, weight reduction, energy saving and environmental protection, the demand for high-strength automotive steel in the automotive industry is becoming increasingly urgent. Compared with traditional ordinary carbon steel, high-strength steel can reduce the curb weight of automobiles and reduce the weight of automobiles, thereby achieving energy saving and emission reduction, reducing environmental pollution, and reducing automobile manufacturing and transportation costs. At present, high-strength steel plates have become the mainstream steel for commercial vehicle girders and structural parts, which require good plasticity and formability, as well as good surface quality. [0003] However, high-strength ste...

Claims

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Application Information

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IPC IPC(8): C22C38/04C22C38/02C22C38/38C22C38/26C22C38/24C22C38/28C21D8/02
CPCC22C38/04C22C38/02C22C38/38C22C38/26C22C38/24C22C38/28C21D8/0226C21D2211/002
Inventor 严立新梁亮李会汪净秦金柱熊维亮吴浩鸿刘奇奇吴润黄建波郭德福
Owner 湖南华菱涟源钢铁有限公司
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