Seamless Pipe Q345B

Seamless Pipe Q345B

Q345B seamless steel pipe belongs to low alloy high strength structural steel. One method of exiting is 16Mn seamless steel pipe. Before delivery, visible cracks, folding, scarring, rolling and delamination are not allowed on the inner and outer surfaces of the Q345B seamless steel pipe. The...

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Q345B seamless steel pipe belongs to low alloy high strength structural steel. One method of exiting is 16Mn seamless steel pipe. Before delivery, visible cracks, folding, scarring, rolling and delamination are not allowed on the inner and outer surfaces of the Q345B seamless steel pipe.

The scarring defect of the outer wall of Q345B seamless steel pipe is actually a typical outer surface folding defect, which is formed by the existence of microcracks on the Q345B seamless steel pipe surface of the billet, which are oxidized at high temperature around the cracks after heating in the heating furnace and further expanded in the subsequent rolling process.

The abnormal martensitic structure on the near Q345B seamless steel pipe surface of a folded crack on the outer surface is caused by a sharp cooling caused by stagnant water at the crack.


Q345B/16Mn Structural tube:
Standard:

GB/8162,ASTM A53(A,B),ASTM A500/A501/A519,JIS G3441/3444/3456,ISO2937, DIN 1626/17175

 Grade:

10#,20#,35#,45#;STPG 38,STS38,STB30,STB33,STB35,STPG42,,st37,st35.8,st35.4,st42,st45-8,st45-4

 Application:

Used in general structure and mechanism , including construction , machinery , transportation , aviation ,petroleum mining and each kind of structure tubes

 


Structure tube  Outside diameter tolerance


Hot rolled(extrude, expansion)

±1% D or 0.50,choose the largest



Cold drawn(rolled)

±1% D or 0.30,choose the largest


 

Cold drawn(rolled) structure tube Wall thickness Tolerance

Steel pipe type

Wall thickness

Tolerances

Cold Drawn(Rolled)

<3

±15%,-10%S ,choose the larger one

>3

±12.5%,-10%S

 We can supply seamless pipes size from 2" to 30" and wallthickness is from 4mm to 40mm

Please directly contact us for details. stock is available.



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