Cold rolling baking hardened steel with yield strength 220MPa and production method thereof
A bake hardening and yield strength technology is applied to cold-rolled bake hardening steel with a yield strength of 220 MPa and its production field. , The effect of low production cost
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Embodiment 1
[0021] The yield strength of 220MPa grade cold-rolled and bake-hardened steel is: its composition and weight percentage are: C 0.05, Mn 0.70, P 0.06, Als 0.015, B 0.004, Si 0.04, S0.01, N0.001, and the rest are Fe and inevitable impurities.
[0022] The method for producing 220MPa-level cold-rolled and bake-hardened steel with a yield strength of 220 MPa, and its steps:
[0023] 1) The cast slab is heated to 1180°C and finished rolling at 860°C, and the rolled thickness is 2.5mm;
[0024] 2) Coiling at 650℃ after cooling by laminar flow;
[0025] 3) The hot-rolled steel coil is naturally cooled to 70°C for cold rolling, the total reduction rate is controlled at 85%, and the product thickness is 0.4mm;
[0026] 4) Carry out continuous annealing, the annealing temperature is controlled at 780℃;
[0027] 5) The steel plate is cooled in the annealing furnace, the temperature drop rate is controlled at 30°C / sec, and the temperature of the steel plate after cooling is controlled at 390°C;
[0...
Embodiment 2
[0032] The yield strength of 220MPa grade cold-rolled and bake-hardened steel is that its composition and weight percentage are: C 0.07, Mn 0.55, P 0.045, Als 0.022, B 0.002, Si 0.025, S0.015, N0.004, and the rest are Fe and inevitable impurities.
[0033] The method for producing 220MPa-level cold-rolled and bake-hardened steel with a yield strength of 220 MPa, and its steps:
[0034] 1) The cast slab is heated to 1220°C, and the final rolling is carried out at 880°C, and the rolled thickness is 3.5mm;
[0035] 2) Coiling at 680℃ after cooling by laminar flow;
[0036] 3) The hot-rolled steel coil is naturally cooled to 60°C for cold rolling, the total reduction rate is controlled at 80%, and the product thickness is 0.7mm;
[0037] 4) Carry out continuous annealing, the annealing temperature is controlled at 790℃;
[0038] 5) The steel plate is cooled in the annealing furnace, the temperature drop rate is controlled at 45℃ / sec, and the temperature of the steel plate after cooling is c...
Embodiment 3
[0043] The yield strength of 220MPa grade cold-rolled and bake-hardened steel is that its composition and weight percentage are: C 0.085, Mn 0.50, P 0.03, Als 0.03, B 0.0035, Si 0.030, S0.012, N0.002, and the rest are Fe and inevitable impurities.
[0044] The method for producing 220MPa-level cold-rolled and bake-hardened steel with a yield strength of 220 MPa, and its steps:
[0045] 1) The cast slab is heated to 1230°C and finished rolling at 900°C, and the rolled thickness is 4.0mm;
[0046] 2) Coiling at 695℃ after laminar flow cooling;
[0047] 3) The hot-rolled steel coil is naturally cooled to 45°C for cold rolling, the total reduction is controlled at 77.5%, and the product thickness is 0.9mm;
[0048] 4) Carry out continuous annealing, the annealing temperature is controlled at 800℃;
[0049] 5) The steel plate is cooled in the annealing furnace, the temperature drop rate is controlled at 60℃ / sec, and the temperature of the steel plate after cooling is controlled at 405℃;
[00...
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