Non hardened and tempered state hot-rolled steel strip with yield strength higher than 900MPa and preparation method thereof
A technology of yield strength and hot-rolled strip steel, applied in the field of metallurgy, can solve the problems of high alloy cost and high cost of quenching and tempering process, achieve high mechanical properties, improve work hardening ability, and reduce production costs
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[0023] Example 1
[0024] Melt molten steel is smelted in a 150-ton converter according to the set composition and continuously cast into a slab. The composition is C0.06% by weight, Si 0.20%, Mn 1.20%, Nb 0.02%, V 0.04%, Ti0.04% , Cr0.8%, Mo0.30%, B0.001%, P<0.012%, S<0.01%, the balance is Fe, the thickness of the cast slab is 220mm.
[0025] The cast slab is heated to 1250°C for rough rolling. The rough rolling process is 5 passes, the roughing start-rolling temperature is 1170°C, the roughing final rolling temperature is 1070°C, and an intermediate slab with a thickness of 38mm is obtained.
[0026] The intermediate billet is finished rolling, the finishing rolling process is 7 passes, the finishing rolling temperature is 980℃, the second rolling temperature is 950℃, the third rolling temperature is 930℃, the fourth rolling temperature is 890℃, and the fifth rolling temperature is 850℃. ℃, the six-rolling temperature is 820℃, the final rolling temperature is 780℃, the reduction o...
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[0028] Example 2
[0029] The preparation method and composition of the cast slab are the same as in Example 1, and the thickness of the cast slab is 250 mm.
[0030] The rough rolling process was the same as in Example 1, and an intermediate billet with a thickness of 58 mm was obtained.
[0031] The intermediate billet is finished rolling, the finishing rolling process is 6 passes, the finishing rolling temperature is 960℃, the second rolling temperature is 940℃, the third rolling temperature is 920℃, the fourth rolling temperature is 900℃, and the fifth rolling temperature is 860 ℃, the final rolling temperature is 840℃, the reduction of each pass of finishing rolling is controlled at 15-40%, and the thickness of the strip after finishing rolling is 12mm.
[0032] After finishing rolling, it is water-cooled to 450°C at a speed of 35°C / s, coiled by a coiler, and then subjected to offline tempering. The offline tempering temperature is 400°C and the tempering time is 1h to obtain the...
Example Embodiment
[0033] Example 3
[0034] The preparation method and composition of the cast slab are the same as in Example 1, and the thickness of the cast slab is 240 mm.
[0035] The rough rolling process was the same as in Example 1, and an intermediate billet with a thickness of 45 mm was obtained.
[0036] The intermediate billet is finished rolling, the finishing rolling process is 5 passes, the finishing rolling temperature is 1000℃, the second rolling temperature is 980℃, the third rolling temperature is 920℃, the fourth rolling temperature is 900℃, and the final rolling temperature is 880 ℃, the reduction of each pass of finishing rolling is controlled at 15-40%, and the thickness of the strip after finishing rolling is 6mm.
[0037] After finishing rolling, it is water-cooled to 200°C at a speed of 15°C / s, then coiled by a coiler, and then subjected to offline tempering. The offline tempering temperature is 600°C and the tempering time is 2h to obtain the finished hot-rolled strip steel. ...
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