A process for producing 700mpa grade trip steel by acid rolling
A technology, acid rolling technology, applied in the field of acid rolling to produce 700MPa grade TRIP steel, can solve the problem of not being able to sufficiently improve the mechanical properties of TRIP steel
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Embodiment 1
[0045] The process for producing 700MPa-grade TRIP steel by acid rolling provided in this example uses hot-rolled coils as raw materials, and the hot-rolled coils are successively decoiled, welded, stretched and straightened, pickled, rolled, and heat treated. Obtain 700MPa grade TRIP steel:
[0046] In the pickling, the pickling temperature is 79°C, and the pickling speed is 85m / min;
[0047] In the rolling, five rolling mills F1-F5 are used for continuous cold rolling, and the entrance speed of the five rolling mills F1-F5 is 120m / min.
[0048] In terms of weight percentage, the chemical elements of the hot rolled coil are: C: 0.2%, Si: 0.16%, Mn: 1.9%, P: 0.020%, S: 0.007%, Alt: 1.4%, the rest is Fe and unavoidable impurity elements.
[0049] The coiling temperature of the hot-rolled coil is 615°C.
[0050] The structure of the hot rolled coil is pearlite and ferrite.
[0051] The welding adopts laser welding, the welding power is 12000w, the welding speed is 4m / min, and ...
Embodiment 2
[0060] The process for producing 700MPa-grade TRIP steel by acid rolling provided in this example uses hot-rolled coils as raw materials, and the hot-rolled coils are successively decoiled, welded, stretched and straightened, pickled, rolled, and heat treated. Obtain 700MPa grade TRIP steel;
[0061] In the pickling, the pickling temperature is 76°C, and the pickling speed is 40m / min;
[0062] In the rolling, five rolling mills F1-F5 are used for continuous cold rolling, and the entrance speed of the five rolling mills F1-F5 is 60-200m / min.
[0063] In terms of weight percentage, the chemical elements of the hot-rolled coil are: C: 0.18%, Si: 0.14%, Mn: 1.8%, P: 0.020%, S: 0.007%, Alt: 1.3%, the rest is Fe and unavoidable impurity elements.
[0064] The coiling temperature of the hot-rolled coil is 600°C.
[0065] The structure of the hot rolled coil is pearlite and ferrite.
[0066] The welding adopts laser welding, the welding power is 11000w, the welding speed is 3m / min...
Embodiment 3
[0075] The process for producing 700MPa-grade TRIP steel by acid rolling provided in this example uses hot-rolled coils as raw materials, and the hot-rolled coils are successively decoiled, welded, stretched and straightened, pickled, rolled, and heat treated. Obtain 700MPa grade TRIP steel;
[0076] In the pickling, the pickling temperature is 82°C, and the pickling speed is 130m / min;
[0077] In the rolling, five rolling mills F1-F5 are used for continuous cold rolling, and the entrance speed of the five rolling mills F1-F5 is 60-200m / min.
[0078] In terms of weight percentage, the chemical elements of the hot rolled coil are: C: 0.22%, Si: 0.18%, Mn: 2.0%, P: 0.020%, S: 0.007%, Alt: 1.5%, the rest is Fe and unavoidable impurity elements.
[0079] The coiling temperature of the hot-rolled coil is 630°C.
[0080] The structure of the hot rolled coil is pearlite and ferrite.
[0081] The welding adopts laser welding, the welding power is 13000w, the welding speed is 5m / mi...
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