Hot rolled steel plate surface oxidation iron sheet control method for vanadium-containing automobile beam

A hot-rolled steel plate, surface oxidation technology, applied in the field of hot rolling of metal strips, to achieve the effect of reducing rolling costs, reducing metal oxidation and burning loss, and reducing the increase in smelting costs

Inactive Publication Date: 2008-03-26
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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Problems solved by technology

[0003] In order to overcome the deficiency that the mass percentage of molten steel Si must be strictly controlled below 0.20% in the existing medium-thin slab continuous casting and rolling strip steel surface oxide scale control method, the technical problem to be solved by this invention is to provide a vanadium-containing automobile beam. A method for controlling surface oxide scales of hot-rolled steel sheets. This method can also effectively control surface red rust defects of vanadium-containing hot-rolled steel sheets for automobile beams without increasing investment in equipment, but the Si content can be relaxed to less than 0.30%

Method used

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Embodiment

[0016] A hot-rolled plate factory applies the surface oxide scale control method of the vanadium-containing hot-rolled steel plate for automobile beams of the present invention to control the red rust defect of the vanadium-containing hot-rolled steel plate for automobile beams. When making steel, the mass percentage of the chemical composition of molten steel is shown in Table 3, except for the ingredients listed in Table 3, the rest is Fe and other impurities; it is cast into a continuous casting slab of 200mm×750~1300mm×11000mm by conventional continuous casting method . Heating is carried out in a walking heating furnace with a temperature of 1200°C to 1230°C. After descaling by high-pressure water, it is sent to the rough rolling mill R1 for three passes, and the rough rolling mill R2 for three passes. After rough rolling, the middle slab The thickness is between 28mm and 35mm. The intermediate billet is coiled by a coreless transfer hot coil box, and then sent to the fi...

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Abstract

The present invention discloses a surface scale control method of hot-rolled steel plate for vanadium-bearing automobile frame. It is characterized by that the mass percentage of molten steel chemical components of raw material steel of said method is as follows: C is 0.06%-0.12%, Si is less than or equal to 0.30%, Mn is 1.05%-1.25%, V is 0.04%-0.10%, P is less than or equal to 0.025%, S is less than or equal to 0.015% and the rest is Fe and other impurity. Its slab drop-out temperature is controlled at 1200deg.C-1230deg.C, initial temperature of rough rolling is controlled at 940deg.C-1020deg.C and its final rolling temperature range, is 840deg.C-880deg.C.

Description

technical field [0001] The invention relates to the field of hot rolling of metal strips, in particular to a method for controlling surface oxide scale of vanadium-containing steel plate hot rolling. Background technique [0002] At present, the hot-rolled steel plates for automobile beams containing vanadium are mainly used to make force-bearing parts such as longitudinal beams, beams and carriages of automobile frames, which have high requirements on the strength, toughness and plasticity of the steel plates. The tensile strength range of hot-rolled steel plates for automobile girders is between 370 and 700 MPa, and the largest amount of girder plates with a strength level of 510 MPa is used. At present, domestic iron and steel enterprises usually use V, Nb, and Ti as microalloying elements to produce hot-rolled steel sheets for automobile beams according to their respective resource characteristics and process equipment conditions, and there are red rust defects on the su...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B37/74C22C38/12
Inventor 左军张开华杨秀亮佘广夫李卫平李正荣刘勇江南红
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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