Accreditation Administration System:
1, pressure vessels : with a capital R in the grades of the end，their grade can yield point is also available carbon content or with alloying elements , Such as : Q345R, Q345 as the
yield point . Another example : 20R, 16MnR, 15MnVR, 15MnVNR, 8MnMoNbR, MnNiMoNbR, 15CrMoR Dengjun
with a carbon content of or containing alloy elements said ;
2, welded gas cylinders steel : with a capital HP in the grades of the end, the grades can yield point that , such as :
Q295HP, Q345HP; can also be with alloying elements expressed , such as : 16MnREHP.
3, boiler plate: with a lower case g at grade of the end.its Grades can be yield point said , such as : Q390g; can also
be used carbon content or contain alloying elements to express , such as 20g, 22Mng, 15CrMog, 16Mng, 19Mng,
13MnNiCrMoNbg, 12Cr1MoVg and so on.
4, the bridge with a steel plate : lowercase q at grade of end , such as Q420q, 16Mnq, 14MnNbq and so on.
