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Tensile strength-780 MPa-stage vanadium-contained cold-rolled dual-phase steel and preparation method thereof

A technology of tensile strength and dual-phase steel, which is applied in the field of high-strength steel and its preparation, can solve the problems of production cost, formability and welding performance without comprehensive consideration, and achieve the effect of reducing production cost and low production cost

Active Publication Date: 2016-09-07
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] To sum up, the existing invention mainly considers the production cost and mechanical properties of dual-phase steel unilaterally, and does not comprehensively consider factors such as production cost, formability and welding performance.

Method used

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  • Tensile strength-780 MPa-stage vanadium-contained cold-rolled dual-phase steel and preparation method thereof
  • Tensile strength-780 MPa-stage vanadium-contained cold-rolled dual-phase steel and preparation method thereof

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preparation example Construction

[0036] The preparation method of the above-mentioned vanadium-containing cold-rolled dual-phase steel with a tensile strength of 780MPa comprises the following steps:

[0037] a. Smelting process: smelting according to the weight percentage composition of the above-mentioned vanadium-containing cold-rolled dual-phase steel with a tensile strength of 780MPa, and controlling its vanadium content in the converter (by controlling the vanadium content in the original molten iron, rather than adding additional vanadium ferroalloy), cast into a slab to obtain a slab;

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

[0039] c. Pickling process: hot-rolled coils are subjected to pickling (i.e. pickling + cold rolling process) to obtain thin strip stee...

Embodiment 1

[0047] The preparation method of the 780MPa grade vanadium-containing 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

V

N

DP1

0.11

0.52

1.70

0.012

0.008

0.040

0.35

0.06

0.004

DP2

0.12

0.40

1.60

0.012

0.006

0.030

0.40

0.05

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 ho...

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Abstract

The invention relates to high-strength steel and a preparation method thereof, in particular to tensile strength-780 MPa-stage vanadium-contained cold-rolled dual-phase steel and a preparation method thereof. The tensile strength-780 MPa-stage vanadium-contained cold-rolled dual-phase steel comprises the following components in percentage by weight: 0.09-0.14% of C, 0.10-0.60% of Si, 1.30-1.80% of Mn, 0.10-0.60% of Cr, 0.01-0.06% of Al, 0.02-0.07% of V, P not more than 0.02%, S not more than 0.015%, N not more than 0.006%, and the balance of Fe and inevitable impurities. The tensile strength-780 MPa-stage vanadium-contained cold-rolled dual-phase steel is low in production cost and excellent in welding performance and mechanical performance, and reaches the yield strength of 430-480 MPa, the tensile strength of 805-840 MPa and the elongation of 15-18%.

Description

technical field [0001] The invention relates to a high-strength steel and a preparation method thereof, in particular to a vanadium-containing dual-phase steel with a tensile strength of 780MPa 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 (C...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/18C22C38/02C22C38/04C22C38/06C22C38/12C21D8/02
CPCC21D8/0226C21D8/0273C21D2211/005C21D2211/008C22C38/02C22C38/04C22C38/06C22C38/12C22C38/18
Inventor 郑之旺邝春福左军张功庭王敏莉余灿生于秀
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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