Cold-rolled steel sheet with 420 MPa grade yield strength and preparation method of steel sheet
A technology of yield strength and cold-rolled steel plate, which is applied in the field of cold-rolled steel plate with a yield strength of 420MPa and its preparation, can solve the problems of increasing difficulty in controlling the surface quality of the strip steel, improving the diffusion ability, and affecting the surface quality of the strip steel, achieving a reduction in Difficulty in controlling the surface quality of strip steel, the reduction in the growth rate of precipitated particles, and the effect of good precipitation strengthening effect
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Embodiment 1
[0052] A cold-rolled steel plate with a yield strength of 420MPa, the composition and mass percentage are: C: 0.06%, Si: 0.04%, Mn: 0.8%, Nb: 0.025%, and the rest is Fe and unavoidable impurity elements; its thickness is 1mm.
[0053] The preparation method of the above-mentioned yield strength 420MPa grade cold-rolled steel plate comprises the steps:
[0054] Step 1, smelting and forging:
[0055] According to the chemical composition of the 420MPa yield strength cold-rolled steel plate, the raw materials are selected and blended, and then melted into ingots; among them, the yield strength 420MPa grade cold-rolled steel plate, the composition and its mass percentage are: C: 0.06%, Si: 0.04%, Mn: 0.8%, Nb: 0.025%, the rest is Fe and unavoidable impurity elements; the ingot is forged into a 40mm thick slab;
[0056] Step 2, hot rolling:
[0057] (1) Insulate the forged slab at 1220°C for 2 hours;
[0058] (2) hot-rolling the slab after heat preservation, the rolling start t...
Embodiment 2
[0073] A cold-rolled steel plate with a yield strength of 420MPa, the composition and mass percentage are: C: 0.07%, Si: 0.1%, Mn: 0.9%, Nb: 0.025%, and the rest is Fe and unavoidable impurity elements; its thickness is 1.8mm.
[0074] The preparation method of the above-mentioned yield strength 420MPa grade cold-rolled steel plate comprises the steps:
[0075] Step 1, smelting and forging:
[0076] According to the chemical composition of the 420MPa yield strength cold-rolled steel plate, the raw materials are selected and mixed, and then smelted into ingots; among them, the yield strength 420MPa grade cold-rolled steel plate, the composition and its mass percentage are: C: 0.07%, Si: 0.1%, Mn: 0.9%, Nb: 0.025%, the rest is Fe and unavoidable impurity elements; the ingot is forged into a 50mm thick slab;
[0077] Step 2, hot rolling:
[0078] (1) Insulate the forged slab at 1220°C for 2 hours;
[0079] (2) hot-rolling the slab after heat preservation, the starting rolling...
Embodiment 3
[0094] A cold-rolled steel plate with a yield strength of 420MPa, the composition and mass percentage of which are C: 0.06%, Si: 0.04%, Mn: 1.0%, Nb: 0.02%, and the rest is Fe and unavoidable impurity elements; its thickness is 1.2 mm.
[0095] The preparation method of the above-mentioned yield strength 420MPa grade cold-rolled steel plate comprises the steps:
[0096] Step 1, smelting and forging:
[0097] According to the chemical composition of the 420MPa yield strength cold-rolled steel plate, the raw materials are selected and mixed, and then smelted into ingots; among them, the yield strength 420MPa grade cold-rolled steel plate, the composition and its mass percentage are C: 0.06%, Si: 0.04%, Mn : 1.0%, Nb: 0.02%, the rest is Fe and unavoidable impurity elements; the ingot is forged into a 50mm thick slab;
[0098] Step 2, hot rolling:
[0099] (1) Heat the forged slab at 1230°C for 2.5 hours;
[0100] (2) Hot-rolling the slab after heat preservation, the starting ...
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