Ultralow yield ratio 980 MPa-grade cold rolling two-phase steel and manufacturing method thereof
A manufacturing method and technology of 980mpa, applied in the field of dual-phase steel, can solve the problems of decreased plasticity and formability, difficulty in meeting processing and forming, increase in yield strength, etc., and achieve good formability, high n value, and good elongation.
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[0018] Example 1:
[0019] A 980MPa-grade cold-rolled dual-phase steel with low process sensitivity and low yield ratio. Its composition and weight percentage content: C: 0.17%, Mn: 1.76%, Als: 0.04%, Si: 0.5%, P: 0.010 %, S: 0.005%, Cr: 0.4 The balance is Fe and unavoidable impurities. The manufacturing process is as follows:
[0020] 1) Smelting and continuous casting into billets;
[0021] 2) Heat the cast slab to 1250°C and hold it for 2.5 hours, then perform hot rolling, start rolling at 1150°C, and control the final rolling temperature at 900°C:
[0022] 3) For coiling, control the coiling temperature at 650℃;
[0023] 4) Carry out conventional pickling;
[0024] 5) Perform cold rolling and control the cumulative reduction rate of cold rolling to 66.7%;
[0025] 6) Carry out continuous annealing, control the annealing temperature at 780℃, and the annealing time for 120s;
[0026] 7) Cool down to 720°C at a slow cooling rate of 3°C / s;
[0027] 8) Perform rapid cooling, the cooling ra...
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[0029] Example 2:
[0030] 980MPa grade low process sensitivity, low yield ratio cold rolled dual phase steel, its composition and weight percentage content: C: 0.17%, Mn: 1.76%, Als: 0.04%, Si: 0.5%, P: 0.010%, S: 0.005%, Cr: 0.4 The balance is Fe and unavoidable impurities. The manufacturing process is as follows:
[0031] 1) Smelting and continuous casting into billets;
[0032] 2) Heat the cast slab to 1250°C and hold it for 2.5 hours, then perform hot rolling, start rolling at 1150°C, and control the final rolling temperature at 900°C:
[0033] 3) For coiling, control the coiling temperature at 650℃;
[0034] 4) Carry out conventional pickling;
[0035] 5) Perform cold rolling and control the cumulative reduction rate of cold rolling to 66.7%;
[0036] 6) Carry out continuous annealing, control the annealing temperature at 800℃, and the annealing time for 120s;
[0037] 7) Cool to 710°C at a slow cooling rate of 3°C / s;
[0038] 8) Perform rapid cooling, the cooling rate is controlled...
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[0040] Example 3:
[0041] 980MPa grade cold-rolled dual-phase steel with low process sensitivity and low yield ratio, its composition and weight percentage content: C: 0.14%, Mn: 2.0%, Als: 0.04%, Si: 0.5%, P: 0.010%, S: 0.005%, Nb: 0.03%, Cr: 0.3%, the balance is Fe and unavoidable impurities. The manufacturing process is as follows:
[0042] 1) Smelting and continuous casting into billets;
[0043] 2) Heat the cast slab to 1250°C and hold it for 2.5 hours, then perform hot rolling, start rolling at 1150°C, and control the final rolling temperature at 920°C:
[0044] 3) For coiling, control the coiling temperature at 680℃;
[0045] 4) Carry out conventional pickling;
[0046] 5) Perform cold rolling and control the cumulative reduction rate of cold rolling to 66.7%;
[0047] 6) Carry out continuous annealing, control the annealing temperature at 790℃ and the annealing time for 120s;
[0048] 7) Cool down to 700°C at a slow cooling rate of 3°C / s;
[0049] 8) Carry out rapid cooling, the ...
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