610Mpa high-strength steel plate for low-yield-ratio petroleum reserve tank and manufacturing method thereof
A high-strength steel plate, 610mpa technology, applied in the field of low-alloy steel production technology, to achieve the effect of short production cycle, saving quenching + tempering process and energy saving
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Embodiment 1
[0036]The main components required for the production of steel plates are: C: 0.08%, Si: 0.25%, Mn: 1.54%, P: 0.010%, S: 0.005%, Nb: 0.017%, V: 0.037%, Ti: 0.012% ,: Ni: 0.17%, Mo: 0.10%, and the rest are Fe and unavoidable impurities. The above-mentioned prepared raw materials are smelted on a 210-ton converter, and continuously cast into 250mmх2200mmх3060mm continuous casting slabs, which are heated to 1200°C; three-stage rolling of forming, widening, and extending is adopted, and the roughing mill is rolled for 8 passes. The temperature is 1148°C, forming, widening and first-stage elongation rolling are completed; the intermediate billet is 60mm, the starting rolling temperature of the finishing mill is 960°C, and 6-pass rolling is adopted, and the final rolling temperature of 20mmх25530mmх29600mm steel plate is 870 ℃. After the steel plate is rolled, there are three stages of cooling. In the first stage, the speed of the roller table of the finishing mill is set to 4m / s, ...
Embodiment 2
[0039] The main components required for the production of steel plates are: C: 0.08%, Si: 0.25%, Mn: 1.53%, P: 0.010%, S: 0.003%, Nb: 0.021%, V: 0.042%, Ti: 0.012% ,: Ni: 0.19%, Mo: 0.11%, and the rest are Fe and unavoidable impurities. The above-mentioned prepared raw materials are smelted on a 210-ton converter, and continuously cast into 250mmх1820mmх2970mm continuous casting slabs, which are heated to 1200°C; three-stage rolling of forming, widening, and elongating is adopted, and the roughing mill is rolled for 8 passes. The temperature is 1157°C, forming, widening and first-stage elongation rolling are completed; the intermediate billet is 95mm, the starting temperature of the finishing mill is 950°C, and 6-pass rolling is adopted, and the final rolling temperature of 33mmх2830mmх12900mm steel plate is 867 ℃. After the steel plate is rolled, there are three stages of cooling. In the first stage, the roller table speed of the finishing mill is set to 3.5m / s, and the air ...
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