Standard： Application： Model N0．of steel tubes：
Seamless steel tubes for oil casing and tubing API SPEC 5CT Standard of American Petroleum Institute Seamless steel tubes for oil casing and tubing in oil wells J55，N80，L80，P110 etc．
Seamless steel tubes for petroleum cracking GB9948 Chinese national standard Served as for furnace tubes，heat exchange tubes and pipelines in petroleum and refinery plants 1n 9n 1Er!rMn 1rhMn 1f：hM0 etC
Seamless steeI tubes for structures GB，_r81 62 Chinese national standard
ASTM A53 Standard of American Society of Testing Materials
ASME SA53 Boiler and pressure vessel--c-Ojrde of ASME		 Seamless steel tubes for manufacturing pipelines。vessels，equipment and mechanical structures 1 O，20，35、45，Q345，1 5CrMo，1 2Crl MoV,A53A，A53B，SA53A，SA53B, etc．
Seamless steel tube for transmission of fluids GB／T8163 Chinese national standard General seamless steel tubes for conveying fluids 10．20，Q345，etc．
Seamless steel tubes for ships Standard for malerials and wielding from Chinese classifying society Chinese clasifying society(CCS)
Standard of DNV Det Norske Veritas(DNV)
Standard of Lloyd'S Register of UK(LR)　Lloyd'S Register of UK(LR)
Standard of Germanischer Lloyd Germanischer Lloyd(GL)
Standard of American Bureau of Shipping(ABS)American Bureau of Shipping(ABS)
Standard of BUREAU VERITAS(BV)BUREAU VERITAS(BV)
Standard of RINA Italian classification society(RINA)
Standard of NIPPON KAIJI KYOKAI(NK)NIPPON KAIJI KYOKAI(NK)
GB／T5312 Chinese national standard		 Seamless steel tubes for manufacturing marine boilers and ovemeaters as we as pressure pipes opf grade I and Ⅱ． 320，360，410，460，490，etc
Seamless steel tubes in small calibers for high(low and medium) pressure boilers and petrochemical industry GB3087 Chinese national standard
GB5310 Chinese national standard
ASME SA210 Boiler and pressure vessel code of ASME
ASME SA213 Boiler and pressure vessel code of ASME
DINl7175 Deutsches industrial standard~		 Used as the pipes on the heated side of low and medium pressure boilers(normally with operating pressure not higher than 5．88Mpa and
operating temperature below 450 oc)；as the pipes on the heated sides of high·pressure boilers，economizers，overheaters，reheaters and pipes
for petrochemical industry(with the operating pressure above 9．8Mpa and operating temperature ranging between 450~C~650~C1		 10、20、20G、20MnG、25MnG、15CrMoG、12Cr2MoG、12Cr1MoVG、12Cr2MoWVTiB、10Cr9Mo1VNb、SA210A1、SA210C、SA213 T11、SA213 T12、SA213 T22、SA213 T23、SA213 T91、SA213 T92、ST45.8/Ⅲ、15Mo3、13CrMo44、10CrMo910etc.
Seamless steel tubes for high-pressure chemical fertilizer processmg equipment GB6479 Chinese national standard Seamless steel tubes for high-pressure chemical fertilizer processing equipment and pipelines thereof 10、20、16Mn、10MoWVNb、15CrMo、1Cr5Mo、12 Cr2Moetc
Pipe-Line Seamless Steel Pipe API SPEC 5L——API Standard
GB/T9711.2——CNS		 Used as oxygen, water, and oil delivery pipe in oil and natural gas industry. B,X42,X52,X60,X65,X70