12. chamfer: The steel pipe inspection conducted after the end of the process, to the pipe end beveling size requirements; 13. Ultrasonic Inspection Ⅱ: root again by ultrasonic testing to check for straight seam welded steel pipe in expanding, after pressure defects that may arise; 14.X-ray inspection Ⅱ: expanding steel pipe after hydrostatic test and industrial X-ray inspection and pipe end welds TV film; 15. The tube end magnetic particle inspection: this check in order to find the pipe ends defects; 16. corrosion and coating: steel qualified according to user requirements after corrosion and coatings. No. 45 parts with thick-walled seamless 45 # seamless steel after quenching good mechanical properties, 45 # seamless steel pipe is widely used in a variety of important structural parts, especially those working in the alternating load connected rods, bolts, gears and shafts, etc. However, lower surface hardness, do not wear. Available quenched + surface hardening to improve the surface hardness of the part chemical composition: its chemical composition in the carbon-containing (C) the amount of 0.42% to 0.50% acid seamless steel manufacturers, Si content of 0.17 ~ 0.37%, Mn content of 0.50 to 0.80% , Cr content <= 0.25%. Heat treatment: Recommended heat treatment temperature: Normalizing 850, 840 quenching and tempering of steel 600.45 for high-quality carbon structural steel, high hardness and easy machining, mold template used to do, shoot the child, guide posts, such as pickling saponification seamless steel pipe, subject to heat treatment. 1.45 No. seamless steel pickling steel after quenching no treatment before tempering, hardness greater than HRC55 (up to HRC62) is qualified. Maximum practical hardness as HRC55 (high-frequency quenching HRC58). 2.45 carburizing of steel not to use heat treatment process. After quenching parts with good mechanical properties, is widely used in a variety of important structural parts, especially those under the alternating load rod work, bolts, gears and shafts, etc. However, lower surface hardness, do not wear. Available quenching + surface hardening to improve the parts of the surface hardness. Acid phosphate seamless steel pipe industry virtues (certified), provided by Liaocheng, Heze seamless steel pipe Co. virtue. Liaocheng virtue Pipe Co., Ltd. (www.meidegc.com) (www.meidegc.com) (www.mdwfg.com) (www.mdggc.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. Industry leaders in the United States and Germany with the staff warmly welcome all inquiries negotiations to create the virtues pipe industry a better future.