450MPa economical type high-surface-quality highly-reamed steel and preparation method thereof
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A high reaming steel, 450mpa technology, applied in the field of 450MPa economical high surface quality high reaming steel and its preparation, can solve the problem of high cost, achieve the effect of reducing alloy cost, saving process cost and easy production
Inactive Publication Date: 2018-03-23
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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[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
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[0040] The present invention also provides a preparation method for the above-mentioned 450MPa-level economical high-surface-quality high-hole reaming steel, comprising the following steps: smelting process→continuous casting process→heating process→rough rolling process→hot coil box process→finish rolling process→laminar flow Cooling process → coiling → slow cooling → pickling process → coiling and packaging.
[0041] 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]: 0.055~0.085%, [Si]: 0.30~0.80%, [Mn]: 0.60~1.30%, [P ]: 0.010~0.020%, [S]: ≤0.003%, [Alt]: 0.010~0.050%, [Ca]: 0.0010~0.0050%, [N]: ≤0.0050%, [O]: ≤0.0040%, the rest It is Fe and unavoidable impurities, and [C]×[Mn]×10 4 ≤0.10, {[P]+10×[S]}×10 2 ≤0.04, [Ca] / [S]≥0.3.
[0042] Aiming at the chemical composition of the 450MPa grade economical steel with high surface quality and hi...
Embodiment 1
[0058] This embodiment adopts six experimental groups, and the chemical composition of the 450MPa 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 450MPa economical type high-surface-quality highly-reamed steel and a preparation method thereof, and belongs to the technical field of ferrous metallurgy and calendaring. The450MPa economical type high-surface-quality highly-reamed steel comprises, by weight, 0.045-0.085% of C, 0.30-0.80% of Si, 0.60-1.30% of Mn, 0.010-0.020% of P, 0-0.003% of S, 0.010-0.050% of Alt, 0.0010-0.0050% of Ca, 0-0.0050% of N, 0-0.0040% of O, and the balance Fe and inevitable impurities, wherein C*Mn*104 is smaller than or equal to 0.10, {P+10*S}*102 is smaller than or equal to 0.04, and Ca / S is greater than or equal to 0.3. The preparation method comprises the following steps of smelting, continuous casting, heating, rough rolling, hot box coiling, finish rolling, laminar cooling, coiling, slow cooling, acid pickling and coiling. The 450MPa economical type high-surface-quality highly-reamed steel has the characteristics of being low in cost and excellent in performance, and can meet the requirements of steel for car chassis and 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 450MPa 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 ...
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