A production method for improving the comprehensive mechanical properties of t91 seamless steel pipe
A technology of seamless steel pipe and comprehensive mechanics, applied in the direction of metal material coating process, etc., can solve the problems of long cycle, difficult to meet service conditions, energy saving and high efficiency, etc., to avoid oxidation and decarburization, omit annealing process, control The effect of furnace temperature stability
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Embodiment 1
[0038] (1) Select the hot-rolled annealed T91 seamless pipe as the research object, and the steel pipe specification is Φ82mm×8.5mm;
[0039] (2) Carry out two passes of cold rolling to the steel pipe, carry out phosphating treatment in the middle of the two passes of rolling, and degrease the steel pipe after rolling. The cold rolling process is: the total deformation of cold rolling is 60%, The rolling deformation is 45%; the rolling deformation in the second pass is 26%, and no annealing is performed between the two passes;
[0040] (3) Quenching+tempering treatment is performed on the rolled steel pipe to obtain a finished pipe. Before quenching, preheat twice at 500°C, holding time for 10 minutes, and second preheating temperature at 800°C, holding time for 10 minutes. The quenching temperature is 1040°C, the holding time is 10min, and the cooling method is air cooling. The tempering temperature is 760°C, the holding time is 60min, and the cooling method is air cooling;...
Embodiment 2
[0045] (1) Select a hot-rolled annealed T91 seamless pipe as the experimental object, and the steel pipe specification is Φ82mm×8.5mm;
[0046] (2) Cold rolling is carried out on the steel pipe, phosphating treatment is carried out in the middle of the two rolling passes, and oil removal treatment is carried out on the steel pipe after rolling. The cold rolling process is: the total deformation of cold rolling is 65%, and the rolling deformation in the first pass The rolling deformation in the second pass is 50%; the rolling deformation in the second pass is 24%, and no annealing is carried out between the two passes;
[0047] (4) Quenching+tempering treatment is performed on the rolled steel pipe to obtain a finished pipe. Preheat twice before quenching: the first preheating temperature is 500°C, the holding time is 10min, the second preheating temperature is 800°C, and the holding time is 10min. The quenching temperature is 1040°C, the holding time is 10min, and the cooling...
Embodiment 3
[0052] (1) Select a hot-rolled annealed T91 seamless pipe as the experimental object, and the steel pipe specification is Φ82mm×8.5mm;
[0053] (2) Cold rolling is carried out on the steel pipe, phosphating treatment is carried out between the two rolling passes, and oil removal treatment is carried out on the steel pipe after rolling. The cold rolling process is: the total deformation of cold rolling is 63%, and the rolling deformation in the first pass The rolling deformation in the second pass is 50%; the rolling deformation in the second pass is 22%, and no annealing is carried out between the two passes;
[0054] (4) Quenching+tempering treatment is performed on the rolled steel pipe to obtain a finished pipe. Preheat twice before quenching: the first preheating temperature is 500°C, the holding time is 10min, the second preheating temperature is 800°C, and the holding time is 10min. The quenching temperature is 1040°C, the holding time is 10min, and the cooling method is ...
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