X60 pipe line steel and production method thereof
A technology of pipeline steel and steel plate, applied in the direction of temperature control, to achieve the effect of optimizing product structure, good comprehensive performance and preventing mixed crystals
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Embodiment 1
[0038] A. The slab with the following chemical composition: C 0.065wt%, Si 0.20wt%, Mn 1.40wt%, S 0.004wt%, P 0.015wt%, Nb 0.040wt%, V 0.045wt%, Ti 0.015wt%, N 0.006wt%, Als 0.025wt%, and the rest are Fe and unavoidable impurities, which are sent to a walking beam heating furnace with a temperature of 1220°C in the soaking section and heated for 180 minutes, in which the slab is in the soaking section The heating time is 45 minutes to ensure that the Nb and V micro-alloys precipitated in the slab are fully re-dissolved, the austenite grains are refined and the controlled cooling precipitation after rolling is prepared, the internal structure of the slab is uniform, and the furnace is released;
[0039] B. Use high-pressure water with a pressure of 17MPa to spray and descale the front and back sides of the slab out of the furnace for 13 seconds;
[0040] C. Send the descaled slab to the double-stand compact steckel rolling mill, and control the rolling start temperature to 1100...
Embodiment 2
[0045] A. The slab with the following chemical composition: C 0.070wt%, Si 0.25wt%, Mn 1.45wt%, S 0.005wt%, P 0.018wt%, Nb 0.045wt%, V 0.040wt%, Ti 0.017wt%, N 0.007wt%, Als 0.030wt%, and the rest are Fe and unavoidable impurities, which are sent to a walking beam heating furnace with a temperature of 1230°C in the soaking section and heated for 200 minutes, in which the slab is in the soaking section The time is 50 minutes to ensure that the Nb and V micro-alloys precipitated in the slab are fully re-dissolved, the austenite grains are refined and the controlled cooling precipitation after rolling is prepared, the internal structure of the slab is uniform, and the furnace is released;
[0046] B. Use high-pressure water with a pressure of 15MPa to spray and descale the front and back sides of the slab out of the furnace for 15 seconds;
[0047] C. Send the descaled slab to the double-stand compact steckel rolling mill, and control the rolling start temperature to 1120°C, cond...
Embodiment 3
[0052] A. The slab with the following chemical composition: C 0.069wt%, Si 0.22wt%, Mn 1.46wt%, S 0.005wt%, P 0.016wt%, Nb 0.047wt%, V 0.041wt%, Ti 0.018wt%, N 0.006wt%, Als 0.033wt%, the rest is Fe and unavoidable impurities; it is sent into a walking beam heating furnace with a temperature of 1240°C in the soaking section and heated for 190 minutes. The time is 50 minutes to ensure that the Nb and V micro-alloys precipitated in the slab are fully re-dissolved, the austenite grains are refined and the controlled cooling precipitation after rolling is prepared, the internal structure of the slab is uniform, and the furnace is released;
[0053] B. Use high-pressure water with a pressure of 20MPa to spray and descale the front and back sides of the slab out of the furnace for 10 seconds;
[0054] C. Send the descaled slab to the double-stand compact steckel rolling mill, and control the rolling start temperature to 1130°C, conduct continuous rough rolling for 5 passes, and open...
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