Hot galvanized high-strength steel with 390MPa tensile strength for internal structural member of saloon car and production method of hot galvanized high-strength steel
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A technology of tensile strength and production method, applied in the field of hot-dip galvanized high-strength steel, can solve the problems of high alloy content, low strength, and can not meet the requirements of lightweight body, and achieve high resistance to secondary processing brittleness and high strength. , the effect of good formability
Active Publication Date: 2014-12-10
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 hot galvanized high-strength steel with 390MPa tensile strength for an internal structural member of a saloon car. The hot galvanized high-strength steel comprises the following chemical constituents in percentage by weight: 0.0027 to 0.0035 percent of C, 0.071 to 0.095 percent of Si, 0.78 to 0.95 percent of Mn, 0.060 to 0.075 percent of P, smaller than or equal to 0.003 percent of S, 0.015 to 0.030 percent of Als, 0.040 to 0.045 percent of Nb, 0.039 to 0.045 percent of Ti, 0.0008 to 0.0014 percent of B, smaller than or equal to 0.003 percent of N, smaller than or equal to 0.002 percent of O, and the balance of Fe and inevitable impurities. The production method of the hot galvanized high-strength steel sequentially comprises the following steps: molten iron desulphurization, converter smelting, external refining, continuous casting, finishing, slab heating, hot continuous rolling, laminar cooling, winding, pickling, cold continuous rolling, continuous annealing plus hot galvanizing, skin pass rolling and finishing. The steel is high in mechanical property, good in formability, high in favorable texture content, and good in corrosion resistance and can meet higher 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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