Cold rolled coil strapping steel having tensile strength of 940MPa or more, and production method thereof
A technology with a tensile strength of 940mpa, applied in the field of strapping steel for cold-rolled coils and its production, can solve the problems of rising raw material costs, complicated operations, and easy damage to machines, and achieves low cost, simple operation, energy consumption and pollution. small effect
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Embodiment 1
[0038] The chemical composition of hot-rolled sheet raw materials is as follows: C: 0.11%, Mn: 1.35%, Si: 0.019%, P: 0.015%, S: 0.004%, Als: 0.04%, and the rest is Fe and residual elements.
[0039] The dimensions of the hot-rolled steel plate are as follows: the thickness is 3.0 mm, the width is 1295 mm; the mechanical properties are as follows: the tensile strength is 590 MPa, and the elongation is 27%; Cutting into two parts with a width of 844 mm and 451 mm respectively, of which the 844 mm part is used as the raw material plate of the paint strip, and is produced by rolling in 9 passes; the distribution of rolling passes from 1 to 9 is as follows: 3.0→2.64 →2.35→1.97→1.76→1.53→1.24→1.10→0.95→0.8 mm, the total reduction rate is 73.3%, the tensile strength of the cold-rolled raw material is 1000 MPa, the elongation is 6%, and the number of repeated bending is 4 times ( R=2.5 mm), no brittle fracture and delamination, curvature ≤ 25.4 mm / 2.4 m, sickle curvature ≤ 2.0 mm / m, g...
Embodiment 2
[0042] The chemical composition of hot-rolled sheet raw materials is as follows: C: 0.12%, Mn: 1.25%, Si: 0.013%, P: 0.015%, S: 0.004%, Als: 0.043%, and the rest is Fe and residual elements.
[0043] The dimensions of the hot-rolled steel plate are as follows: the thickness is 2.9 mm, the width is 1295 mm; the mechanical properties are as follows: the tensile strength is 590 MPa, and the elongation rate is 27%; Cut into two parts with a width of 844 mm and 451 mm respectively, of which the part of 451 mm is used as the blue ribbon raw material plate, and is produced by rolling in 9 passes, and the amount of rolling passes from 1 to 9 is distributed as follows: 2.9→ 2.64→2.35→1.97→1.76→1.53→1.24→1.10→0.95→0.8 mm, the total reduction rate is 72.4%; the tensile strength of the cold-rolled raw material is 1000 MPa, and the elongation is 6%. The number of repeated bending is 4 times (R=2.5 mm), there is no brittle fracture and delamination, the bending degree is ≤25.4 mm / 2.4 m, the...
Embodiment 3
[0046] The chemical composition of hot-rolled sheet raw materials is as follows: C: 0.17%, Mn: 1.48%, Si: 0.024%, P: 0.018%, S: 0.003%, Als: 0.037%, and the rest is Fe and residual elements.
[0047] The dimensions of the hot-rolled steel plate are as follows: the thickness is 3.1 mm, and the width is 1295 mm. The mechanical properties are as follows: the tensile strength is 600 MPa, and the elongation is 26%. According to the equipment characteristics of the 1050 mm rolling mill, it is set according to the needs. There are two parts of mm, of which 844 mm is used as the raw material plate of the paint strip, and it is produced by rolling in 9 passes; the distribution of rolling passes from 1 to 9 is as follows: 3.1→2.64→2.35→1.97→1.76→1.53→1.24→ 1.10→0.95→0.79 mm, the total reduction rate is 74.5%; the tensile strength of cold-rolled raw materials is 990 MPa, the elongation is 6%, the number of repeated bending is 4 times (R=2.5 mm), and there is no brittle fracture delaminat...
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