Introduction of Q345C steel

Compared with Q345A and Q345B steel, Q345C seamless pipe. The low temperature impact test temperature is low and the performance is good. The content of harmful substances P and S is lower than that of Q345A and B. The market price is higher than Q345A, B.

Q345A steel is compared with Q345B, C, D, E steel. The low temperature impact test temperature is high and the performance is good. The content of hazardous substances P and S is higher than that of Q345B, C, D and E. The market price is lower than Q345B, C, D, E.

Q represents the yield of this material, and 345 refers to the yield value of this material, which is around 345. And will decrease the yield value as the thickness of the material increases. Similar to the naming method of Q235.

Q345A, Q345B, Q345C, Q345D, Q345E are mainly different in impact temperature.
Q345A grade, no impact;
Q345B grade, is 20 degrees normal temperature shock;
Q345C grade, is 0 degree impact;
Q345D grade, is -20 degree punch;
Q345E grade, is -40 degree impact.
At different shock temperatures, the value of shock is also different. In the plate, it belongs to the low alloy series. Among low-alloy materials, this material is the most common.

Chemical composition of Q345C seamless pipe:

C	Si	Mn	P	S	Ni	Cr	Cu	Al	V	Nb
0.12-0.20	0.20-0.60	1.00-1.60	≤0.035	≤0.035	≤0.30	≤0.30	≤0.20	≥0.015	0.02-0.15	0.015-0.06

Mechanical properties of Q345C seamless pipe:
Tensile strength: 490-675Mpa
Yield strength: ≥345Mpa 
Elongation%: ≥22

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