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Hot-rolled ferrite-bainite dual-phase steel and production process thereof

A production method, bainite technology, applied in the field of high-strength stamping steel, can solve problems such as increasing production costs

Inactive Publication Date: 2012-05-09
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The existing patent number is CN200910088964.5 "A Flexible Rolling Production Method for High-Strength Hot-Rolled Dual-phase Steel" and the patent number is CN200810056868.8 "A Manufacturing Method for Hot-Rolled Dual-phase Steel Sheet with a Tensile Strength of 700MPa" involving Microalloying elements Cr, Mo, and Nb are added to the composition of the dual-phase steel, which increases the production cost

Method used

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  • Hot-rolled ferrite-bainite dual-phase steel and production process thereof
  • Hot-rolled ferrite-bainite dual-phase steel and production process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The design composition of hot-rolled ferritic bainitic dual-phase steel is: C: 0.10%, Si: 0.034%, Mn: 1.38%, P: ≤0.0012%, S: ≤0.006%, and the balance is Fe and other impurity elements.

[0019] The rolling production process includes heating, heat preservation, rough rolling, finishing rolling, cooling, and coiling, specifically:

[0020] The steel smelted according to the above design composition is cast into billets, the billets are heated to a temperature of 1200°C, kept for 1.5 hours, and then rolled. The starting temperature of rough rolling is controlled at 1090°C, the starting temperature of finish rolling is controlled at 940°C, the deformation in the non-recrystallized area is 65%, and the final rolling temperature is controlled at 850°C. After rolling, the steel plate is cooled to 700°C by the first stage of water cooling at a cooling rate of 30°C / s, air-cooled for 5s, and then cooled by the second stage of water cooling at a cooling rate of 50°C / s to reach t...

Embodiment 2

[0023] The design composition of the hot-rolled dual-phase steel is: C: 0.092%, Si: 0.036%, Mn: 1.4%, P: ≤0.0012%, S: ≤0.006%, and the balance is Fe and other impurity elements.

[0024] The rolling production process includes heating, heat preservation, rough rolling, finishing rolling, cooling, and coiling, specifically:

[0025] The steel smelted according to the above design composition is cast into billets, the billets are heated to a temperature of 1200°C, kept for 2 hours, and then rolled. The starting temperature of rough rolling is controlled at 1150°C, the starting temperature of finish rolling is controlled at 960°C, the deformation in the non-recrystallized area is 70%, and the final rolling temperature is controlled at 830°C. After rolling, the steel plate is cooled to 640°C by the first stage of water cooling at a cooling rate of 40°C / s, air-cooled for 10s, and then cooled by the second stage of water cooling at a cooling rate of 50°C / s to reach the coiling tempe...

Embodiment 3

[0028] The design composition of the hot-rolled dual-phase steel is: C: 0.096%, Si: 0.04%, Mn: 1.4%, P: ≤0.0012%, S: ≤0.006%, and the balance is Fe and other impurity elements.

[0029] The rolling production process includes heating, heat preservation, rough rolling, finishing rolling, cooling, and coiling, specifically:

[0030] The steel smelted according to the above design composition is cast into billets, the billets are heated to a temperature of 1200°C, kept for 1.5 hours, and then rolled. The starting temperature of rough rolling is controlled at 1150°C, the starting temperature of finish rolling is controlled at 950°C, the deformation in the non-recrystallized area is 77%, and the final rolling temperature is controlled at 820°C. After rolling, the steel plate is cooled to 620°C by the first stage of water cooling at a cooling rate of 30°C / s, air-cooled for 8s, and then cooled by the second stage of water cooling at a cooling rate of 50°C / s to reach the coiling tempe...

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Abstract

The invention provides hot-rolled ferrite-bainite dual-phase steel and a production process thereof, belonging to the field of high-strength punching steel. The hot-rolled dual-phase steel comprises, in weight percent, 0.09 to 0.10% of C, 0.01 to 0.4% of Si, 1.3 to 1.4% of Mn, no more than 0.012% of P and no more than 0.006% of S, with the balance being Fe and other impurity elements. The production process comprises the following sequential steps: heating, insulation, rough rolling, finish rolling, post-rolling cooling and reeling. The dual-phase steel in the invention has the advantages of a yield strength greater than 340 MPa, a tensile strength greater than 450 MPa, good matching of strength and plasticity, good fracture performance and capacity of meeting requirements for mechanical properties of 450 MPa grade ferrite-bainite hot-rolled dual-phase steel.

Description

technical field [0001] The invention relates to a hot-rolled ferritic bainite dual-phase steel and a production method thereof, belonging to the technical field of high-strength stamping steel. Background technique [0002] In order to reduce the weight of automobiles, reduce fuel consumption, and improve vehicle safety, etc., the research and development plans of many new steel types in recent years mainly focus on the development of advanced high-strength steel plates with good formability. [0003] Hot-rolled dual-phase steel is one of the most widely used high-strength steels because of its advantages of high strength, low yield ratio, high initial work hardening rate, and good combination of strength and toughness. Compared with the traditional martensitic dual-phase steel (DP steel), ferrite + bainite dual-phase steel (FB steel) can take into account the contradiction and balance of strength and ductility, and its welding, fatigue and The hole expansion performance is...

Claims

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Application Information

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IPC IPC(8): C22C38/04B21B37/74
Inventor 代晓莉郭佳李飞朱国森周志伟冯军徐海卫孟宪堂于广泳
Owner SHOUGANG CORPORATION
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