P91 alloy tube according to GB / T8162-87 provisions 1, Specification: Hot tube diameter 32 ~ 630mm. Wall thickness of 2.5 ~ 75mm. Cold-rolled (cold drawn) tube diameter 5 ~ 200mm. Wall thickness of 2.5 ~ 12mm. 2, the appearance of quality: the inner and outer surfaces of the steel pipe shall not have cracks, folded, rolled off, separation, hairline and scarring defects. These defects should be completely removed, the wall and the outer diameter than the negative deviation after clearing. 3, both ends of the pipe should be cut at right angles Shanghai t91 alloy tube, and remove burrs. Pipe wall thickness greater than 20mm to allow hot gas cutting and sawing. Agreement by both parties may not cut head. 4, drawn or cold rolled precision P91 alloy tube "surface quality" reference GB3639-83. T91 steel under quenched state welding, heat affected zone softened layer inevitable t91 seamless, and more severe than the softening pearlitic heat-resistant steel. When compared with the slow heating and cooling rate norms, greater degree of softening. Another import width t91 alloy tube, softening layer and the distance it is from the fusion line, not only with the heating and welding characteristics, but also with preheating, post-weld heat treatment and so on. Harbin Boiler Works has done test results T91 HAZ hardness curve t91 alloy steel pipe 42X5_ Katherine source (certified) _ Shuozhou 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.