本英文版为内部欧亿·体育（中国）有限公司，仅供参考，以中文版为准。The Chinese version of standards hasprecedence to their English translationswhich are only for internal reference.中华人民共和国国家标准National Standard of the People’s Republic of China GB 6479-2000 neq ISO 9329-2：1997 Supersedes GB 6479-1986高压化肥设备用无缝钢管Seamless steel tubes for high-pressure For chemical fertilizer equipmentsApproved by the State Bureau of Technical Supervision on 2000–10- 25 Implemented from 2001 – 09 – 01 GB 6479 – 2000 Foreword ThisStandardisnotequivalenttoadoptISO9329–2:1997SeamlessSteelTubesfor Pressure Vessels ---- Delivery Specifications ---- Part2: Carbon Steel and Alloy Steel of Specified High Temperature Performance. The criteria of allowable deviation for size, degree of bend, press-flat deformation coefficient for steel tubes in this Standard are more strict than international criteria while the criteria of physical performance is equivalent to international ones. This Standard, compared with original edition, has made revision to following provisions: 1． The criteria of allowable deviation for size are revised. Original Table 1 is deleted. The specification for the size is changed to refer to Table 1 of GB/T 17395 – 1998. 2． The brand number of 12SiMoVNb is added. Phosphorous and sulfur content in different brand numbers of steel is revised. 3． Supplementation is made to the delivery status of steel tubes. 4． The provision of using leaking magnetic testing to replace hydraulic test is added while the provision of using ultrasonic testing to replace hydraulic test is deleted. 5． The stipulations of making press-flat test to steel tubes with OD > 400mm is deleted. 6． The requirements for low-fold inspection for steel tubes rolled of steel ingot is added as well as the requirements for inspection of non-metal inclusion in steel tubes rolled of continuous cast blank and steel ingot. 7． Definite stipulations are made for the class of ultrasonic testing. From the date of implementation, this Standard shall supercede GB 6479 – 1986 Seamless Steel Tubes for Chemical Fertilizer Equipment.This Standard is put forth by the State Bureau of Metallurgical Industry. This Standard is under jurisdiction of the National Technical Committee for Standardization of Steel for management. This Standard is prepared by: the Anshan Steel Group Company and the Chengdu Seamless Steel Tube Co. Ltd. Key persons for preparation of this Standard are Pu Zhiming, Dong Changfu, Wu Keping, Xu Yongmei and Feng Wenhua This Standard is issued in June 1986 for the first time. — 1 — 中华人民共和国国家标准National Standard of the People’s Republic of ChinaGB 6479-2000neq ISO 9329-2：1997Supersedes GB 6479-1986高压化肥设备用无缝钢管Seamless steel tubes for high-pressu