DH590MPa acid rolling production technology control method
A technology of production process and control method, which is applied in the field of dual-phase steel rolling, can solve problems such as easy cracking, and achieve considerable economic benefits
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Embodiment 1
[0039] The hot rolling raw material composition is: C: 0.14%, Mn: 1.6%, Si: 0.4%, P: 0.015%, S: 0.003%, Alt: 0.5%.
[0040] After the smelting process is completed, the finishing temperature of the hot rolling is 893°C, the coiling temperature is 654°C, the yield strength of the hot rolling raw material is 418MPa, and the microstructure of the hot rolling raw material is ferrite and pearlite. Laser welding process parameters are: power 11000w, welding speed 4.5m / min, wire feeding speed 4.5m / min, annealing current 110A. The elongation rate of tension leveling machine: 0.8%; the insertion amount of 1# bending unit: 35mm; the insertion amount of 2# bending unit: 34mm; the insertion amount of 3# straightening unit: 16mm. Pickling speed: 60~199m / min, pickling temperature: 76.7℃.
[0041] The reduction distribution ratio of the rolling mill: the reduction distribution ratio of the stands F1-F5 are: 33.1%, 31.5%, 24.6%, 25.4%, 0.5%. The unit tension between the five stands from the...
Embodiment 2
[0043] The hot rolling raw material composition is: C: 0.13%, Mn: 2.05%, Si: 0.37%, P: 0.014%, S: 0.005%, Alt: 0.45%.
[0044] After the smelting process is completed, the hot rolling finishing temperature is 885°C, the coiling temperature is 643°C, the yield strength of the hot rolling raw material is 421MPa, and the hot rolling raw material structure is ferrite and pearlite. Laser welding process parameters are: power 11000w, welding speed 4.3m / min, wire feeding speed 4.2m / min, annealing current 110A. The elongation rate of tension leveling machine: 1.5%; the insertion amount of 1# bending unit: 38mm; the insertion amount of 2# bending unit: 26mm; the insertion amount of 3# straightening unit: 18mm. Pickling speed: 74~190m / min, pickling temperature: 87.6℃.
[0045]The reduction distribution ratio of the rolling mill: the reduction distribution ratio of the stands F1-F5 are: 28.7%, 28.7%, 26.6%, 25.4%, 0.4%. The unit tension between the five stands from the mill entrance to...
Embodiment 3
[0047] The hot rolling raw material composition is: C: 0.148%, Mn: 1.65%, Si: 0.43%, P: 0.014%, S: 0.005%, Alt: 0.55%.
[0048] After the smelting process is completed, the finishing temperature of the hot rolling is 918°C, the coiling temperature is 655°C, and the yield strength of the hot rolling raw material is 432MPa. The laser welding process parameters are: power 11000w, welding speed 5m / min, wire feeding speed 4.8m / min, annealing current 110A. The elongation rate of tension leveling machine: 1.3%; the insertion amount of 1# bending unit: 34mm; the insertion amount of 2# bending unit: 38mm; the insertion amount of 3# straightening unit: 19mm. Pickling speed: 75-205m / min, pickling temperature: 85.5°C.
[0049] The reduction distribution ratio of the rolling mill: the reduction distribution ratio of the stands F1-F5 are: 33.8%, 33.6%, 29.0%, 27.4%, 0.55%. The unit tension between the five stands from the mill entrance to the mill exit is: 55N / mm 2 , 155N / mm 2 , 165N / mm...
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