Cold-rolled steel sheet with yield strength of 980 MPa grade and manufacturing method thereof
A yield strength, cold-rolled steel plate technology, used in bell-type furnaces, lighting and heating equipment, etc., can solve the problems of difficulty in achieving stable control and increase in cost, and achieve low cost, low annealing temperature, and high technology. simple effect
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[0060] Example l
[0061] The chemical composition of the cold-rolled steel sheet designed in this embodiment is as follows by weight percentage: C: 0.09%, Si: 0.25%, Mn: 1.9%, Nb: 0.035%; Ti: 0.15%; Cr: 0.8%; P: 0.008% S: 0.001%; N: 0.0051%; O: 0.0038%; Alt: 0.036%; the rest is iron Fe and inevitable impurities. According to the above-mentioned composition design, the raw materials are smelted on a 120-ton converter, and alloyed with Nb, Ti and Cr during the refining process, and then continuously cast into a continuous casting slab of 175mm×1210mm×11800mm, and the continuous casting slab is heated to 1250℃ , Heating time 160 minutes, rolling on a hot tandem mill, rough rolling start temperature control is 1150℃, rough rolling finish temperature control is 1050℃, rough rolling 5 passes, intermediate billet thickness is 30mm, finish rolling start rolling The temperature is controlled to 1020℃, the finishing temperature of the finishing rolling is controlled to 880℃, the finish...
Example Embodiment
[0065] Example 2
[0066] The chemical composition of the cold-rolled steel sheet designed in this embodiment is as follows by weight percentage: C: 0.1%, Si: 0.28%, Mn: 1.8%, Nb: 0.06%; Ti: 0.14%; Cr: 1.0%; P: 0.009% S: 0.003%; N: 0.0045%; O: 0.0036%; Alt: 0.032%; the rest is iron Fe and unavoidable impurities.
[0067] According to the above-mentioned composition design, the raw materials are smelted on a 120-ton converter, and alloyed with Nb, Ti and Cr during the refining process, and then continuously cast into a continuous casting slab of 175mm×1230mm×11800mm, and the continuous casting slab is heated to 1260℃ , The heating time is 172 minutes, the rough rolling opening temperature is controlled to 1190℃, the rough rolling final rolling temperature is controlled to 1040℃, the rough rolling is 5 passes, the intermediate billet thickness is 35mm, and then the intermediate billet is finished rolling, the finish rolling temperature It is controlled to 1000℃, the finishing temper...
Example Embodiment
[0071] Example 3
[0072] The chemical composition of the cold-rolled steel sheet designed in this embodiment is as follows: C: 0.09%, Si: 0.18%, Mn: 1.85%, Nb: 0.055%; Ti: 0.16%; Cr: 0.9%; P: 0.01% S: 0.004%; N: 0.0041%; O: 0.0033%; Alt: 0.030%; the rest is iron Fe and unavoidable impurities.
[0073] According to the above-mentioned composition design, the raw materials are smelted on a 120-ton converter, and alloyed with Nb, Ti, and Cr during the refining process, and then continuously cast into a continuous casting slab of 175mm×1230mm×11800mm, and the continuous casting slab is heated to 1270℃ , The heating time is 165 minutes, the rough rolling opening temperature is controlled to 1180℃, the rough rolling final rolling temperature is controlled to 1040℃, the rough rolling is 5 passes, the intermediate billet thickness is 33mm, and then the intermediate billet is finished rolling and the finishing rolling temperature It is controlled to 1000℃, the finishing temperature of fin...
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