TRIP (Transformation-Induced Plasticity) steel and production method thereof

A production method and mass percentage technology, applied in the field of steel, can solve the problems of stable production of through-board stability, high cooling rate requirements, high production line requirements, etc., to reduce equipment requirements, flexible production, and improve safety. Effect

Inactive Publication Date: 2012-01-18
SHOUGANG CORPORATION
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Problems solved by technology

When TRIP steel is produced in combined pickling and cold rolling unit and continuous annealing unit, since the carbon equivalent is at the upper limit of laser welding machine, especially narrow lap welding machi

Method used

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  • TRIP (Transformation-Induced Plasticity) steel and production method thereof
  • TRIP (Transformation-Induced Plasticity) steel and production method thereof
  • TRIP (Transformation-Induced Plasticity) steel and production method thereof

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Embodiment

[0024] Smelting and producing slabs with C and Mn contents (other components are omitted) as listed in Table 1 as shown in No. 1, No. 2, No. 3 and No. 4 respectively. The slab is subjected to continuous hot rolling, wherein the heating temperature is 1250±30°C, the final rolling temperature is 930±20°C, and the coiling temperature is 580±30°C. Single-stand cold rolling is adopted, and the reduction rate during the cold rolling process is The control is 55-75%. Afterwards, heat according to the heating temperatures shown in Table 1, serial number 1, serial number 2, serial number 3, and serial number 4 respectively, control the corresponding hot spot temperature, and keep it warm. When the cold spot temperature reaches the When the temperature is heated, the temperature is lowered and cooled. Finally, a single frame is used for leveling, wherein, during the leveling process, the elongation rate is controlled at 0.8±0.3%.

[0025] Table 1 Corresponding C, Mn content of the TRIP ...

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Abstract

The invention discloses TRIP (Transformation-Induced Plasticity) steel with low carbon content and high manganese content and a production method thereof, belonging to the technical field of steel products. The TRIP steel is the steel with the low carbon content and the high manganese content. The production method of the TRIP steel comprises the steps of smelting, thermal and continuous rolling, acid-washing in a push-pull manner, cold rolling, annealing in a cover manner and flattening. The yield strength of the TRIP steel is 400-900 MPa. The tensile strength of the TRIP steel is 1000-1500 MPa. The bake hardening value of the TRIP steel is 30-70 MPa. The TRIP steel can be applied to automobile components, and therefore, the TRIP steel has good application prospect in the respects of reducing the weight of an automobile and increasing the safety.

Description

technical field [0001] The invention relates to the technical field of steel products, in particular to a low-carbon high-manganese TRIP steel and a bell annealing production method thereof. Background technique [0002] Low-carbon TRIP steel plate, the current large-scale industrial production adopts continuous annealing process, which is mostly used in the automotive industry, mainly for automotive safety structural parts, chassis parts, such as: B-pillar inner panels, anti-collision beams, etc. According to the European standard EN10336-2007, the composition requirements of TRIP steel (780MPa grade) are C≤0.32%; Si≤2.20%; Mn≤2.50%; S≤0.015%; P≤0.12%, Al≤2.0%; Cr+Mo ≤0.60%; Nb+Ti≤0.20%; V≤0.20%; B≤0.005%; the balance is Fe. Its performance requirement is yield strength 470MPa≤Rp 0.2 ≤600MPa, tensile strength 3Rm≥780MPa, elongation after breaking requires A 80 ≥21%, n 10 ≥0.16, bake hardening value BH 2 ≥40MPa. For the ultra-high-strength TRIP steel above 780MPa, ther...

Claims

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Application Information

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IPC IPC(8): C22C38/58C22C38/38C22C38/16C21D9/663C21D1/26
Inventor 滕华湘李本海王洋邝霜刘李斌王海全尉冬熊爱明姜英花朱国森刘光明
Owner SHOUGANG CORPORATION
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