Company annual sales of various major steel production of Chengdu Iron and Steel Group, Daye Steel Group, Baotou Steel, Baosteel Group, Anshan Iron and Steel Group, Tianjin Seamless, Xining Te steel, Wuxi Steel, Hengyang Steel and other seamless steel pipe and alloy pipe. Main Material: 20 #, 35 #, 45 #, 20G, 20A, 40Mn2,45Mn2,27SiMn, 40MnB, 20MnVB, 20Cr, 30Cr, 35Cr, 40Cr, 45Cr, 50Cr, 38CrSi, 12CrMo, 20CrMo, 35CrMo, 42CrMo, 12CrMoV , 12Cr1MoV, 38CrMoAL, 50CrV, 20CrMnSi, 30CrMnSi, 35CrMnSi, 20CrMnTi, 30CrMnTi, 12CrNi2, 12CrNi3,12Cr2Ni4,40CrNiMoA, 45CrNiMoVA, 20G, 20MnG, 25MnG, 12CrMoG, 15CrMoG, 12Cr2MoG, 12Cr1MoVG, 12Cr2MoWVTiB, 12Cr3MoVSiTiB such as the implementation of standards: GB / T8162-99 structure tube, GB / T8163-99 fluid pipe, GB / T3087-99 low pressure boiler tubes, GB / T5310-95 high-pressure boiler tubes, GB / T6479-2000 fertilizer tube, 27SiMn hydraulic support, high alloy pipe , GB / T9948-85 oil cracking pipe GB9948-88, geological drilling pipe YB235-70, automobile axle casing YB / T5035-96. T91 steel cold cracking tend to be larger, under certain conditions, prone to delayed cracking Shanghai t91 alloy tube, it must be tempered welded joints within 24 h after welding. T91 weld tissue state of lath martensite, tempered martensite after tempering can be changed, and its performance is superior than the lath martensite. When the tempering temperature is low, the tempering effect is not obvious t91, the weld metal is easy to aging and embrittlement; tempering temperature is too high (more than AC1 line), the joint may also austenitizing t91 seamless again, and in the subsequent The cooling process re-hardened. While imports t91 alloy tube, as described in the foregoing, the tempering temperature should also be considered to determine the impact of the joint softening layer. Generally, T91 tempering temperature is 730 ~ 780 ℃ Shanghai t91 alloy tube | Katherine source of steel (certified) | Wuxi t91 provided by source Pipe Co., Ltd. Liaocheng trillion. Liaocheng Katherine source Pipe Co., Ltd. (www.lczygg.com) Shandong Liaocheng, steel leader, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. Katherine source leader in steel with the staff warmly welcome all inquiries negotiations to create Katherine source steel a better future.