Rolling method for 35CrMo ultra-thick wall seamless steel pipe
A technology of seamless steel pipes and rolling mills, which is applied in metal rolling and other directions, and can solve problems such as the inapplicability of medium carbon steel
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Embodiment 1
[0016] Heat the 35CrMo steel square tube billet to 1200-1260°C in an annular furnace, continue heating for 150-200min, and shape it into a cylindrical billet. On a horizontal hydraulic press, use a 140mm punch to put the heated and shaped billet into the die hole. In the circular punching die, the punch is pressed into the billet, and the solid billet is punched and extruded into a hollow ring billet with a cup bottom by means of reverse extrusion. Roll out inside, extend to remove the bottom of the punching cup, and roll the tube in a pilger mill. When rolling the tube, first blow off the oxide scale in the inner hole of the tube, and add graphite and MoS 2 Mix lubricant, insert the mandrel, enter the rolling mill for rolling, the initial rolling temperature is 1150-1170 ℃, the final rolling temperature is 890-910 ℃, one-time heating and rolling, oxygen cut pilger head, 830±10 ℃ chamber furnace Annealing, hydraulic press pressure straightening, head cut to length.
Embodiment 2
[0018] Heat the 35CrMo steel square tube billet to 1200-1250°C in an annular furnace, continue heating for 150-180 minutes, and shape it into a cylindrical billet. On a horizontal hydraulic press, use a 140mm punch to put the heated and shaped billet into the die hole. In the circular punching die, the punch is pressed into the billet, and the solid billet is punched and extruded into a hollow ring billet with a cup bottom by means of reverse extrusion. Roll out inside, extend to remove the bottom of the punching cup, and roll the tube in a pilger mill. When rolling the tube, first blow off the oxide scale in the inner hole of the tube, and add graphite and MoS 2 Mix lubricant, insert the mandrel, enter the rolling mill for rolling, the initial rolling temperature is 1150-1160 °C, the final rolling temperature is 890-900 °C, one-time heating rolling, oxygen cut Pilger head, 830±10 °C chamber furnace Annealing, hydraulic press pressure straightening, head cut to length.
Embodiment 3
[0020] Heat the 35CrMo steel square tube billet to 1250-1260°C in an annular furnace, continue heating for 180-200min, and shape it into a cylindrical billet. On a horizontal hydraulic press, use a 140mm punch to put the heated and shaped billet into the die hole. In the circular punching die, the punch is pressed into the billet, and the solid billet is punched and extruded into a hollow ring billet with a cup bottom by means of reverse extrusion. Roll out inside, extend to remove the bottom of the punching cup, and roll the tube in a pilger mill. When rolling the tube, first blow off the oxide scale in the inner hole of the tube, and add graphite and MoS 2 Mix the lubricant, insert the mandrel, enter the rolling mill for rolling, the initial rolling temperature is 1160°C, the final rolling temperature is 900°C, one-time heating rolling, oxygen cutting Pilger head, 830±10°C chamber furnace annealing, hydraulic pressure Straighten, go to the head to measure.
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