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Reinforced plastic dual-phase steel for 800MPa-grade hot galvanizing and preparation method of reinforced plastic dual-phase steel

A 800mpa, hot-dip galvanizing technology, applied in heat treatment equipment, hot dip plating process, heat treatment process control, etc., can solve the problems of difficult to achieve stable and controllable product performance, rising alloy cost, fine-tuning, etc., to achieve stable and controllable product performance. , the effect of reducing alloy and process costs and increasing stability

Pending Publication Date: 2022-02-15
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The chemical composition of the steel contains precious alloys Mo, Nb and a relatively large amount of Cr, which leads to an increase in the cost of the alloy; in addition, it does not fine-tune the process for products with different thickness specifications, and it is difficult to achieve stable and controllable product performance

Method used

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  • Reinforced plastic dual-phase steel for 800MPa-grade hot galvanizing and preparation method of reinforced plastic dual-phase steel
  • Reinforced plastic dual-phase steel for 800MPa-grade hot galvanizing and preparation method of reinforced plastic dual-phase steel
  • Reinforced plastic dual-phase steel for 800MPa-grade hot galvanizing and preparation method of reinforced plastic dual-phase steel

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preparation example Construction

[0036] The present invention also provides a preparation method for the above-mentioned 800MPa grade hot-dip galvanized reinforced plastic dual-phase steel, comprising the following steps:

[0037] a. Smelting process: smelting according to the set chemical composition and casting into slabs;

[0038] b. Hot rolling process: the slab in step a is heated, dephosphorized, rough rolled, finished rolled and laminar cooling to obtain hot rolled coils; the final rolling temperature is 860-930°C; the laminar cooling adopts the front stage cooling The cooling rate of the upper and lower surfaces is 40-50% and 70-80% respectively; the coiling temperature of 100m from the head and tail of the U-shaped coil is 670-730°C, and the coiling temperature in the middle of the strip is 630-680°C , due to the large temperature drop at the head and tail of the strip, the coiling temperature is different from the middle coiling temperature.

[0039] c, acid rolling process: after the hot-rolled co...

Embodiment

[0049] The present invention provides two groups of 800MPa-grade hot-dip galvanized reinforced plastic dual-phase steels, the composition of which is shown in Table 1;

[0050] Table 1800MPa grade hot-dip galvanized reinforced plastic dual-phase steel chemical composition (wt.%)

[0051] Example C the si mn P S N als 1 0.180 0.25 1.90 0.010 0.003 0.0024 0.70 2 0.200 0.30 2.00 0.006 0.002 0.0032 0.75

[0052] The preparation method of the above-mentioned 800MPa level hot-dip galvanized reinforced plastic dual-phase steel, the specific process is as follows:

[0053] A, smelting process: through smelting process, prepare the duplex steel slab of chemical composition as shown in Table 1;

[0054] B, hot-rolling process: the hot-rolled coil is obtained after the slab is heated, dephosphorized, hot-rolled and laminar cooling, and the specific hot-rolling process parameters are as shown in Table 2;

[0055] Table 2 The main process par...

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Abstract

The invention belongs to the technical field of cold-rolled strip production, and particularly relates to reinforced plastic dual-phase steel for 800MPa-grade hot galvanizing and a preparation method of the reinforced plastic dual-phase steel. The technical problem to be solved by the invention is to provide the reinforced plastic dual-phase steel for 800MPa-grade hot galvanizing and the preparation method of the reinforced plastic dual-phase steel. Through reasonable design of chemical components of the dual-phase steel and adjustment of preparation process parameters, the yield strength of the obtained 800MPa-grade reinforced plastic dual-phase steel for hot galvanizing ranges from 455 MPa to 525 MPa, the tensile strength ranges from 810 MPa to 880 MPa, and the elongation A80 ranges from 23.0% to 29.0%; the microstructure of the steel plate is composed of 40%-50% of ferrite, about 25%-30% of martensite, 5%-25% of bainite and 5%-10% of retained austenite.

Description

technical field [0001] The invention belongs to the technical field of cold-rolled strip production, and in particular relates to reinforced plastic dual-phase steel for 800MPa hot-dip galvanizing and a preparation method thereof. Background technique [0002] With the rapid development of science and technology, in order to reduce the weight of the car body and improve its safety performance, the development of high-strength steel for automobiles has become an inevitable trend. The use of high-strength steel plates to replace traditional materials can significantly improve energy absorption capacity, expand the elastic strain zone, and increase the deformation resistance of components. Dual-phase steel is the most widely used high-strength steel. Its structure is mainly composed of soft ferrite matrix and high-strength martensite. The performance characteristics of this structure are lower yield ratio, higher Strength, etc., suitable for the production of stamping and form...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C21D8/02C21D1/26C23C2/06C23C2/40C21D11/00B21B37/16B21B37/28B21B37/46
CPCC22C38/02C22C38/04C22C38/06C21D8/0205C21D8/0226C21D8/0236C21D8/0247C21D8/0278C21D1/26C23C2/06C23C2/40C21D11/00B21B37/16B21B37/28B21B37/46C21D2211/008C21D2211/002C21D2211/001
Inventor 余灿生郑之旺郑昊青王敏莉周磊磊黄洁
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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