DQ-T method for 1000 MPa stage water and electricity steel plate with thickness not larger than 60 mm
A steel plate and steel plate technology for hydropower, which is applied in the field of metallurgy, can solve the problems that the strength and low-temperature impact toughness cannot meet the mechanical performance requirements of 1000MPa steel for hydropower, reduce the carbon equivalent and welding cold crack sensitivity index, and reduce production costs , The effect of shortening the process flow
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[0039] Example 1
[0040] Smelt molten steel according to the set composition and continuously cast it into a slab with a thickness of 320mm. The composition by weight percentage is C0.1031%, Mn 1.1501%, P 0.0075%, S 0.001%, Si 0.2487%, Ni 1.2502%, Cr 0.375% , Cu 0.0124%, Alt 0.0301%, Nb 0.0241%, Mo 0.3693%, V 0.04%, Ti 0.0136%, B 0.0015%, the balance is Fe;
[0041] Heat the slab to 1200°C for 360 minutes, then use high-pressure water to remove phosphorus, and then perform 8 passes of rough rolling. The opening temperature is 1165°C, the final rolling temperature is 1025°C, and the total reduction ratio is 79.69%; The start rolling temperature of the rolling is 890℃, the final rolling temperature is 839℃, the rolling pass is 4, the total reduction ratio is 63.08%, the thickness of the steel plate after finishing rolling is 24mm, and then a pass of leveling is carried out, and the water cooling after hot rolling Cool to room temperature at a rate of 35°C / s. The microstructure of ...
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[0043] Example 2
[0044] Smelt molten steel according to the set composition and continuously cast it into a slab with a thickness of 320mm. Its composition is C0.114%, Mn 0.9418%, P 0.0077%, S 0.0014%, Si 0.2487%, Ni 1.4338%, Cr0.4825 by weight. %, Cu 0.0136%, Alt 0.0301%, Nb 0.0251%, Mo 0.4739%, V 0.0428%, Ti0.0152%, B 0.0016%, the balance is Fe;
[0045] Heat the slab to 1220°C for 350min, then use high-pressure water to remove phosphorus, and then perform 8 passes of rough rolling. The opening temperature is 1158°C, the final rolling temperature is 1036°C, and the total reduction ratio is 79.69%; The start rolling temperature of the rolling is 905°C, the final rolling temperature is 846°C, the number of rolling passes is 4, the total reduction ratio is 63.08%, the thickness of the steel plate after finishing rolling is 24mm, and then a pass leveling is performed. After hot rolling, water cooling will cool the room temperature at a rate of 40℃ / s;
[0046] The steel plate is tem...
Example Embodiment
[0047] Example 3
[0048] Smelt molten steel according to the set composition and continuously cast it into a slab with a thickness of 320mm. Its composition is C0.114%, Mn 0.9418%, P 0.0077%, S 0.0014%, Si 0.2487%, Ni 1.4338%, Cr0.4825 by weight. %, Cu 0.0136%, Alt 0.0301%, Nb 0.0251%, Mo 0.4739%, V 0.0428%, Ti0.0152%, B 0.0016%, the balance is Fe;
[0049] Heat the slab to 1200°C for 360min, then use high-pressure water to remove phosphorus, and then perform 6 passes of rough rolling. The start rolling temperature is 1165°C, the final rolling temperature is 1038°C, and the total reduction ratio is 63.33%; The start-rolling temperature of the rolling is 887°C, the final rolling temperature is 831°C, the rolling pass is 4, the total reduction is 56.36%, the thickness of the steel plate after finishing rolling is 48mm, and then one pass is leveled. After hot rolling, water cooling is cooled to room temperature at a rate of 30°C / s;
[0050] The steel plate is tempered at a high tempe...
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