Q345A

C≤0.20,Mn≤1.70,Si≤0.50,P≤0.035,S≤0.035

Q345B

C≤0.20,Mn≤1.70,Si≤0.50,P≤0.035,S≤0.035

Q345C

C≤0.20,Mn≤1.70,Si≤0.50,P≤0.030,S≤0.030,Al≥0.015

Q345D

C≤0.18,Mn≤1.70,Si≤0.50,P≤0.030,S≤0.025,Al≥0.015

Q345E

C≤0.18,Mn≤1.70,Si≤0.50,P≤0.025,S≤0.020,Al≥0.015

Q345A,B,C,D,E all contain Nb≤0.07,V≤0.15,Ti≤0.20,Cr≤0.30,Ni≤0.012,Mo≤0.10

Q345 Q390 Q420 Q460

GB/T1591

Makes mechanical device and other structural 

elements like drilling machine, power shovel, 

electricity drive wheel counter-mine trolley,

mineral product automobile, excavator, car 

loader, bulldozer, each kind of hoist crane, coal 

mine hydraulic pressure support which were 

widely used in workshop, the general 

construction and each kind of project machinery, 

like the mine and each kind of project 

construction.

12Mn 15MnVN 16Mn 15MnV

GB1591

Q295(A,B),Q345(A,B,C,D,E)

SM520(B,C), SM570

JISG3106

St44-3, St37-2, St52-3, St50-2

St60-2, St70-2

DIN17100

StE315, StE355, StE380, StE460, StE500, StE520

BS4360

A572(Cr42,50,55,60,65)

ISO4950-2

S275(JR,JO,J2,J2G3,J2G4)

EN10025

S355(JR,JO,J2,J2G3,J2G4)

S420N,S420NL,S450JO,S460N

WH60,WH410LK(BB41BF)