690 MPa grade economical high-surface-quality high-hole-expansion steel and preparation method thereof

A high hole-expanding steel, 690mpa technology, applied in the field of iron and steel metallurgy and rolling, can solve the problem of high cost, achieve the effect of reducing alloy cost, low preparation cost and easy production

Inactive Publication Date: 2018-03-02
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In the 1990s, the United States and Japan successively developed hot-rolled FB steel plates with high hole expansion performance of 440-780MPa. The hole expansion rate is 70% to 131%. It is mainly used in formability, especially good flanging performance. Automobile chassis, wheels and other parts, because they contain more precious alloy elements Cr, Nb, Ti, V and Mo, etc., although the ferrite / bainite dual phase structure can be obtained under the condition of low cooling rate, but Its cost is higher

Method used

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  • 690 MPa grade economical high-surface-quality high-hole-expansion steel and preparation method thereof
  • 690 MPa grade economical high-surface-quality high-hole-expansion steel and preparation method thereof
  • 690 MPa grade economical high-surface-quality high-hole-expansion steel and preparation method thereof

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preparation example Construction

[0041] The present invention also provides a preparation method for the above-mentioned economical high-surface-quality high-hole reaming steel with a tensile strength of 690 MPa, which includes the following steps: smelting and continuous casting process→heating process→rough rolling process→hot coil box process→finish rolling process → Laminar cooling process → Pickling process → Coiling and packaging.

[0042] In the smelting process, smelting should be carried out according to the following chemical composition range, and the weight percentage of the chemical composition is as follows, [C]: 0.055% ~ 0.095%, [Si]: 0.85% ~ 1.50%, [Mn]: 1.30% ~ 1.80% , [P]: 0.010% to 0.020%, [S]: ≤0.003%, [Alt]: 0.010% to 0.050%, [Ca]: 0.0010% to 0.0050%, [N]: ≤0.0050%, [O] : ≤0.0040%, the rest is Fe and unavoidable impurities, and [C]×[Mn]×10 4 ≤0.15, {[P]+10×[S]}×10 2 ≤0.04, [Ca] / [S]≥0.3.

[0043] Aiming at the chemical composition of the economical, high-surface-quality, and high-hole r...

Embodiment 1

[0059] This embodiment adopts six experimental groups, and the chemical composition of the 690MPa grade economical high surface quality and high hole reaming steel of experimental groups 1 to 6 is shown in Table 1;

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Abstract

The invention discloses 690 MPa grade economical high-surface-quality high-hole-expansion steel and a preparation method thereof, and belongs to the technical field of iron and steel metallurgy and calendering. The 690 MPa grade economical high-surface-quality high-hole-expansion steel comprises, by weight percentage, C, Si, Mn, P , S, Alt , Ca, N, O and the balance Fe and unavoidable impurities.The preparation method comprises the following steps of smelting, continuous casting, heating, rough rolling, box hot coiling, finish rolling, laminar cooling, coiling, slow cooling, pickling and coiling for packaging. According to the 690 MPa grade economical high-surface-quality high-hole-expansion steel, by controlling the chemical composition and preparation method of the high-hole-expansion steel, the high-hole-expansion steel has the characteristics of being high in surface quality, low in cost and excellent in performance and can meet the demand of an automobile chassis and steel used for complex stamping parts.

Description

technical field [0001] The invention belongs to the technical field of iron and steel metallurgy and rolling, and in particular relates to a 690MPa economical steel with high surface quality and high hole expansion and a preparation method thereof. Background technique [0002] In order to reduce the weight of automobiles, reduce fuel consumption, and improve vehicle safety, etc., many new steel research and development plans in recent years have mainly focused on the development of Advanced High Strength Steel (AHSS) with good formability. There are many types of AHSS steels, such as ferrite / martensite dual phase (Ferrite / Martensite Dual Phase, FMDP for short) steel, ferrite / bainite dual phase (Ferrite / Bainite Dual Phase, FBDP for short) steel, phase Transformation Induced Plasticity (TRIP) steel, Twinning Induced Plasicity (TWIP) steel, Complex Phase (CP) steel, Martensite (M) steel, quenching partition (Quenching and Paritioning, referred to as Q&P) steel and hot formed ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C21D8/04
CPCC21D8/04C22C38/002C22C38/02C22C38/04C22C38/06
Inventor 汪创伟李正荣崔凯禹
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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