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Classification According to structure
1, the pressure vessel with steel plate: in case of the tail of the trademark R, the number of available yield point can also be used with carbon content or containing alloy elements. Such as: Q345, Q345R for the yield point. Another example: 20R, 16MnR, 15MnVR, 15MnVNR, 8MnMoNbR, MnNiMoNbR, 15CrMoR and with carbon content or content of alloy elements to represent.
2, welding gas cylinders with steel plate: in case of the tail of the trademark HP, its brand can be said with the yield point, such as: Q345HP, Q295HP; also can be used to indicate the alloying elements such as: 16MnREHP.
3, boiler steel plate: with a small G in the tail said. Its grades can be said that the yield point, such as: Q390g; also can be used to indicate the amount of carbon or alloy elements, such as 20g, 22Mng, 15CrMog, 16Mng, 19Mng, 13MnNiCrMoNbg, 12Cr1MoVg, etc..
4, the bridge with the steel plate: with a small Q at the end of the brand, such as 16Mnq, Q420q, 14MnNbq, etc..
5, automobile beam steel plate: with a capital l at the end of the brand, said such as 09MnREL, 06til, 08TiL, 10TiL, 09sivl and 16MnL, 16MnREL etc..
Chemical composition contrast
Grade |
C |
Si |
Mn |
P |
S |
Q345A |
≤0.20 |
≤0.55 |
1.00-1.60 |
≤0.045 |
≤0.045 |
Q345B |
≤0.20 |
≤0.55 |
1.00-1.60 |
≤0.040 |
≤0.040 |
Q345C |
≤0.20 |
≤0.55 |
1.00-1.60 |
≤0.035 |
≤0.035 |
Q345D |
≤0.18 |
≤0.55 |
1.00-1.60 |
≤0.030 |
≤0.030 |
Grade |
V |
Nb |
Al |
Ti |
|
Q345A |
0.02-0.15 |
0.015-0.060 |
|
0.02-0.20 |
|
Q345B |
0.02-0.15 |
0.015-0.060 |
|
0.02-0.20 |
|
Q345C |
0.02-0.15 |
0.015-0.060 |
≥0.015 |
0.02-0.20 |
|
Q345D |
0.02-0.15 |
0.015-0.060 |
≥0.015 |
0.02-0.20 |
|