A kind of alloy steel and preparation method and forming method
A technology of alloy steel and steel coil, which is applied in the direction of metal rolling, can solve the problems of not being able to meet the requirements of light weight and thick thickness of the car body, and achieve the reduction of high-temperature phase transformation products such as ferrite and pearlite, strength and Improved plasticity, ease of uncoiling and subsequent cold rolling
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[0051] Embodiments of the present invention also disclose a method for preparing alloy steel, comprising the following steps:
[0052] (1) The continuous casting slab is hot loaded into the heating furnace, the heating temperature of the heating furnace is 1220-1280°C, and the soaking time is 0.5-3h;
[0053] (2) The slab is first hot-rolled, and then coiled at a coiling temperature of 460-540°C to obtain a hot-rolled steel coil with a structure of bainite;
[0054] (3) The hot-rolled steel plate is thinned by cold rolling to obtain a cold-rolled steel coil;
[0055] (4) Annealing, the structure is transformed into nano-strengthened ferrite.
[0056] Compared with the prior art, the preparation method of this embodiment can at least achieve one of the following beneficial effects:
[0057] (1) The thickness of the steel plate is reduced to 0.5 by hot rolling→cold rolling or hot rolling→cold rolling→annealing, and the strength and plasticity of the product are improved at the...
Embodiment 1
[0080] Example 1: Heating the cast slab to 1220°C, soaking time 3h, after 3 passes of rough rolling, the thickness of the intermediate slab is 30mm, 5 passes of finish rolling, the final rolling temperature is 883°C, the thickness of the steel plate is 4.0mm, the steel plate is Laminar cooling, the cooling rate is 12°C / s, and the coiling temperature is 490°C. The tensile strength of the hot-rolled sheet is 803MPa, and the elongation after fracture is 17.5%. It is pickled with 80°C and 14% hydrochloric acid, and the cold-rolled deformation is 80%, and the thickness is reduced to 0.8mm. Warm forming heating temperature 650°C, air environment, soaking time 10min, forming temperature 600°C, tensile strength after forming 1023MPa, elongation after fracture 22.3%.
Embodiment 2
[0081] Example 2: Heating the cast slab to 1280°C, soaking time 0.5h, after 5 passes of rough rolling, the thickness of the intermediate slab is 20mm, 7 passes of finish rolling, the final rolling temperature is 858°C, the thickness of the steel plate is 2.0mm, the steel plate Laminar cooling is carried out, the cooling rate is 10°C / s, and the coiling temperature is 535°C. The tensile strength of the hot-rolled sheet is 885MPa, the elongation after fracture is 16.0%, pickled with 12% hydrochloric acid at 85°C, the cold-rolled deformation is 75%, and the thickness is reduced to 0.5mm. Warm forming heating temperature 680°C, nitrogen environment, soaking time 13min, forming temperature 650°C, tensile strength after forming 1005MPa, elongation after fracture 20.5%.
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Abstract
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