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GB/T 3091-2008 Q345B welded steel pipes

Q345A welded steel pipes is a low-carbon alloy steel (c <0.2%) which under GB/T 3091-2008 standard, Q345A welded steel pipes have comprehensive performance, low temperature performance, cold stamping performance, welding performance and cutting performance. Widely used in bridges, vehicles, ships, construction, pressure vessels, the surface can be painted black paint, varnish, rust oil, hot dip galvanized, cold galvanized, 3PE and so on.

GB/T 3091-2008 Q345B welded steel pipes

GB/T 3091-2008 Q345B welded steel pipes Chemical composition

chemical composition of Q345B

Grade

Class

C

Mn

Si

S

P

 

 

no more than

Q345

B

<=0.2

<=1.7

<=0.5

0.035

0.035

Q345B welded steel pipes Mechanical properties

mechanical property of Q345B  

Grade

lowder yield

Tensile

Extensibility after

strength Rel/N/MM^2

strength

fracture A/%

no less than

R/N/MM^2

no less than

t<=16mm

        T>16mm

no less than

D<=168.3MM

D>168.3mm

Q345B

345

325

470

13

18

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