Hot-dip galvanized high-strength steel for internal structural parts of cars with tensile strength of 390mpa and production method thereof
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A tensile strength, hot-dip galvanizing technology, applied in the field of car steel, can solve the problems of low strength, high alloy content, can not meet the requirements of lightweight body, etc., achieve high resistance to secondary processing brittleness, good zinc layer Adhesion, high strength effect
Active Publication Date: 2016-08-17
武汉钢铁有限公司
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The hot-dip galvanized steel sheet for automobiles has good corrosion resistance and formability, but its strength is low, it cannot meet the requirements of lightweight body, and the alloy content is high
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[0032] The hot-dip galvanized high-strength steel for internal structural parts of cars with a tensile strength of 390 MPa and its production method will be further described in detail below in conjunction with the accompanying drawings and specific examples.
[0033] Table 1 lists the chemical composition of six specific examples of hot-dip galvanized high-strength steel used in the production of 390MPa-grade car interior structural parts according to the present invention. The production method of steel of these six kinds of concrete examples is as follows: Carry out top-bottom composite blowing on the 90-ton converter of steelmaking plant, adopt molten iron desulfurization technology, make S≤0.002% in molten iron; Add ferroalloy, the addition is completed when 2 / 3 of the steel is tapped, the alloying sequence: aluminum iron → ferrosilicon → ferromanganese; then vacuum treatment, and fine-tuning the composition, the composition fine-tuning alloy addition sequence: aluminum sh...
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Abstract
The invention discloses a hot-dip galvanized high-strength steel for internal structural parts of cars with a tensile strength of 390 MPa. Its chemical composition is calculated by weight percentage: C: 0.0027~0.0035%, Si: 0.071~0.095%, Mn: 0.78~0.95%, P: 0.060~0.075%, S≤0.003%, Als: 0.015~0.030%, Nb : 0.040-0.045%, Ti: 0.039-0.045%, B: 0.0008-0.0014, N≤0.003%, O≤0.002%, and the balance is Fe and unavoidable impurities. Its production method includes the following steps in sequence: molten iron desulfurization, converter smelting, refining outside the furnace, continuous casting, finishing, slab heating, hot continuous rolling, laminar cooling, coiling, pickling, cold continuous rolling, continuous annealing+ Hot-dip galvanized, skin-passed, finished. The steel has high-strength mechanical properties, good formability, high favorable texture content, good corrosion resistance and good surface quality requirements.
Description
technical field [0001] The invention belongs to the technical field of steel for cars, and specifically refers to a hot-dip galvanized high-strength steel for internal structural parts of cars with a tensile strength of 390 MPa and a production method thereof. Background technique [0002] With global warming, reducing vehicle emissions will continue for a long period of time in the future. Lightweight is an important trend in the development of vehicle technology and has received more and more attention and attention. However, one of the important ways to achieve this goal is to reduce the thickness of the body materials, but the safety of the car must be guaranteed, so the automobile manufacturers have higher and higher requirements for the strength of the steel materials used in the body. However, with the continuous improvement of strength, the formability of steel plates is getting worse and worse, especially for some structural parts with complex deformation of the bod...
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