What is the difference between Q345B and Q345C steel

Posted:2020-09-29 13:48:52

difference between Q345B and Q345C

Q345B and Q345C steel are Chinese GB standard low alloy high strength structural steel materials. Q345B and Q345C steel density is 7.85 g/cm3. And they have same strength, that is, tensile strength 470-630 Mpa, min. yield strength is 345 MPa. But what is the difference between Q345B and Q345C steel?

Chemical composition difference between Q345B and Q345C steel:

Grade	C	Si	Mn	P	S	Ni	Cr	Cu:	V
Q345B	0.12-0.2	0.20-0.6	1.00-1.6	≤0.04	≤0.04	≤0.3	≤0.3	≤0.2	0.02-0.15
Q345C	0.12-0.2	0.20-0.6	1.00-1.6	≤0.035	≤0.035	≤0.3	≤0.3	≤0.2	0.02-0.15

Mechanical properties difference between Q345B and Q345C steel:

Grade	Tensile strength, Mpa	Yield strength, Mpa	Elongation	Impact temperature
Q345B	490-675	≥345	≥21	20℃
Q345C	490-675	≥345	≥22	0℃

Q345B and Q345C steel has good weldability, cold and hot workability and corrosion resistance. Q345B and Q345C steel are widely used in bridges, ships, boilers, pressure vessels, petroleum storage tanks, lifting transport machinery and other high-load welded structural parts.

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