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Quenching and annealing preparation method of ultrahigh-strength thin steel plate for automobiles

A kind of quenching annealing and ultra-high technology, which is used in manufacturing tools, heat treatment equipment, furnace types, etc., can solve the problem of only reaching tensile strength, and achieve the effect of ensuring mechanical properties, promising prospects, and simple and feasible heat treatment process control.

Active Publication Date: 2013-02-27
UNIV OF SCI & TECH BEIJING
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Problems solved by technology

The tensile strength of this patented steel grade only reaches 855MPa

Method used

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  • Quenching and annealing preparation method of ultrahigh-strength thin steel plate for automobiles
  • Quenching and annealing preparation method of ultrahigh-strength thin steel plate for automobiles
  • Quenching and annealing preparation method of ultrahigh-strength thin steel plate for automobiles

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Embodiment Construction

[0026] The cast slab with the composition shown in Table 1 is hot-rolled and cold-rolled to obtain a cold-rolled thin steel sheet of required thickness.

[0027] Table 1 is the chemical composition (mass percentage) of embodiment

[0028] The chemical composition (wt.%) of the embodiment of table 1

[0029]

[0030] The quenching process is to heat the cold-rolled low-carbon steel plate with a thickness of 1.5mm to 2mm in a heating furnace to 950°C for 20 minutes, and then perform oil quenching.

[0031] In the present invention, the continuous annealing temperature in the two-phase region is 760°C and 780°C, respectively heated to the temperature at 5°C / s and kept at this temperature for 1200s, then cooled at a cooling rate of 40°C / s to about 400°C and kept at 200s, and then heated at a temperature greater than 15°C. The cooling rate of ℃ / s is quickly cooled to room temperature. The properties corresponding to different chemical compositions and process parameters are sh...

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Abstract

A quenching and annealing preparation method of an ultrahigh-strength thin steel plate for automobiles belongs to the field of metal material heat treatment. The method comprises the steps of: firstly, heating a low-carbon steel cold-rolled sheet containing microalloy elements such as Si, Mn and Nb to a fully austenitic area and performing quenching heat treatment after austenization; secondly, heating the low-carbon steel cold-rolled sheet to a two-phase area so that the lath martensite quenched previously is decomposed and partially inverted to form the austenite, and then quickly cooling the steel sheet above Ms point and preserving heat for secondary partition; and finally, rapidly cooling to the room temperature. The steel sheet has a complex-phase structure composed of a quasi-recrystallized ferrite, a carbide, residual austenite and tiny bainite or martensite structure; and the quasi-recrystallized ferrite structure formed after annealing inherits the lath morphology feature of the martensite, which is advantageous for improving the ductility. The ultrahigh-strength thin steel prepared through the process is high in product of strength and elongation, and has the tensile strength of more than 1100 MPa, the ductility of 20% and the product of strength and elongation of 22000 MPa.%.

Description

technical field [0001] The invention belongs to the field of heat treatment of metal materials, and relates to an ultra-high-strength thin steel plate whose structure at room temperature is composed of quasi-recrystallized ferrite + carbide + retained austenite and a very small amount of bainite / martensite, and its adopted Production methods of quenching and two-phase zone annealing. Background technique [0002] Since the end of the last century, the emission reduction and weight reduction of automobiles and the improvement of impact resistance have become the trend of the automobile manufacturing industry. In order to achieve these goals, it is possible to apply formable high-strength steel, new production technology and strict structural design. Steel manufacturers have also begun to develop new types of high-strength steel for automobiles. [0003] Transformation-induced plasticity steel refers to the steel with multi-phase structure in the steel. These phases are usua...

Claims

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Application Information

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IPC IPC(8): C21D9/46C21D1/18C21D1/26C22C38/06C22C38/04
Inventor 陈银莉苏岚丁然程俊业赵爱民唐荻
Owner UNIV OF SCI & TECH BEIJING
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