Cold Drawn / Cold Rolled Precision Seamless Steel Tube 20# 45

Cold drawn or cold-rolled precision Seamless Steel Tubes

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Relative standard :

GB/T222 permissible tolerance for chemical composition of steel products.

GB/T223.5 Steel and iron-Determination of acid-soluble silicon and total silicon content-Reduced molybdosilicate spectro photometric method(GB/T223.5-2008,ISO 4829-1:1986,ISO 4829-2:1988,MOD)

Mechanical properties

Steel grade 10# 20# 35# 45# Q345B

Deliver condition:

Cold working/Hard condition:+C

No heat treatment after the final cold working process.

Cold working/Soft condition:+LC

After the final treatment there is a suitable cold working process

Stress relieving annealed conditio:+SR

After the final cold working process there is a stress relief heat treatment in a controlled atmosphere

Annealed condition:+A

After the final cold working process the tubes are fully annealed in a controlled atomosphere.

Normalised condition:+N

After the final cold working operation the tubes are normalized in a controlled atomosphere.

The permissible tolerances of the internal and external diameter unit:mm

Length is 2000-12000mm Fixed length and multiple length is available.

Tolerance for length , a)the length ≤5000mm +5,0mm

B)the length ＞5000mm +10,0mm

Every multiple length should leave incision margin according to the following requirement for the steel tubes delivered by multiple length.

1. External diameter≤159mm:5mm~10mm
2. External diameter＞159mm:10mm~15mm

Curvature:≤3.0mm/m

The steel tubes` total length curvature external diameter ≥16mm

• ReH≤500Mpa,≤0.15%L
• ReH＞500Mpa,≤0.20%L
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