A kind of tensile strength 590mpa level cold-rolled dual-phase steel and its preparation method

A technology of tensile strength and dual-phase steel, which is applied in the field of high-strength steel, can solve the problems of poor formability, high yield strength, and high cost, and achieve the effects of low carbon equivalent, good welding performance, and good hardenability

Active Publication Date: 2018-05-01
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the tensile strength in this patent reaches 590MPa, its yield strength is relatively high, the yield strength ratio > 0.60, and the formability is not good; and its rolling process adopts hot rolling, which costs more

Method used

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  • A kind of tensile strength 590mpa level cold-rolled dual-phase steel and its preparation method
  • A kind of tensile strength 590mpa level cold-rolled dual-phase steel and its preparation method
  • A kind of tensile strength 590mpa level cold-rolled dual-phase steel and its preparation method

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preparation example Construction

[0036] The preparation method of above-mentioned a kind of tensile strength 590MPa grade cold-rolled dual-phase steel comprises the following steps:

[0037] a. Smelting process: smelting according to the weight percentage composition of the above-mentioned cold-rolled dual-phase steel with a tensile strength of 590MPa grade, casting into a slab, and obtaining a cast slab;

[0038] b. Hot-rolling process: the billet is heated, dephosphorized, rough-rolled, finish-rolled and laminar-flow cooled to obtain hot-rolled coils; the start-rolling temperature of finish-rolling is 1000-1100°C, and the finish-rolling temperature is 850-950°C , the coiling temperature is 600~700℃;

[0039] c. Pickling process: cold-rolling the hot-rolled coils after pickling to obtain cold-rolled thin strip steel; wherein, the cold-rolling reduction rate is 50-70%;

[0040] d. Continuous annealing process: After continuous annealing of cold-rolled thin strip steel, cold-rolled dual-phase steel is obtaine...

Embodiment 1

[0047] The preparation method of the 590MPa grade low-yield strength cold-rolled dual-phase steel provided by the present invention has the following processes:

[0048] (1) Through the smelting process, a dual-phase steel slab with the chemical composition shown in Table 1 is prepared:

[0049] Table 1 Chemical Composition of Duplex Steel (wt.%)

[0050] Numbering

C

Si

mn

P

S

als

Cr

N

DP1

0.08

0.40

1.40

0.011

0.006

0.040

0.29

0.004

DP2

0.09

0.30

1.45

0.011

0.005

0.035

0.32

0.005

[0051] (2) After heating, dephosphorization, hot rolling and laminar cooling to obtain hot rolled coils, the starting temperature of finish rolling is 1000-1100°C, the finishing rolling temperature is 850-950°C, and the coiling temperature is 600°C ~700°C; the specific hot rolling process parameters are shown in Table 2 below:

[0052] Table 2 Main process parameters of hot rolling of dual-phase ...

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Abstract

The invention belongs to the technical field of high-strength steel, and in particular, relates to tensile strength 590 MPa-grade cold-rolled dual-phase steel and a preparation method thereof. The tensile strength 590 MPa-grade cold-rolled dual-phase steel comprises the following components in percentage by weight: 0.06-0.10% of C, 0.26-0.60% of Si, 1.20-1.60% of Mn, 0.10-0.45% of Cr, 0.02-0.06% of Al, P not more than 0.020%, S not more than 0.015%, N not more than 0.006%, and the balance of Fe and inevitable impurities. The cold-rolled dual-phase steel is low in production cost, excellent in forming performance and low in yield strength and yield ratio; and in addition, the contents of C and Mn are reduced, and little Cr is used for replacing Mn, excellent hardenability of the steel is guaranteed, the carbon equivalent is lower, and the welding performance and the forming performance are better.

Description

technical field [0001] The invention belongs to the technical field of high-strength steel, and in particular relates to a cold-rolled dual-phase steel with a tensile strength of 590 MPa and a preparation method thereof. Background technique [0002] With the development of automobile lightweight technology, it has become an inevitable trend for automobile steel to develop towards high-strength steel. Due to the characteristics of low yield strength, high tensile strength and excellent plasticity, dual-phase steel has become the preferred high-strength steel for automobiles, and its consumption is expected to exceed 70% of the advanced high-strength steel for automobiles. With the continuous release of domestic auto sheet production capacity, the competition in the high-strength steel market has become increasingly fierce. Low-cost, high-performance dual-phase steel has become the goal pursued by various companies and has attracted great attention. [0003] Patent (CN 10274...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/04C22C38/02C22C38/06C22C38/18C21D8/02
CPCC21D6/005C21D8/0226C21D8/0236C21D8/0247C21D2211/005C21D2211/008C22C38/02C22C38/04C22C38/06C22C38/18
Inventor 郑之旺邝春福徐权张功庭王敏莉余灿生于秀
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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