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TORICH INTERNATIONAL CO.,LTD
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O.D. 6 - 350mm Cold Drawn / Cold Rolled Precision Seamless Steel Tube 20# 45

TORICH INTERNATIONAL CO.,LTD
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TORICH INTERNATIONAL CO.,LTD
City: Ningbo
Province/State: Zhejiang
Country/Region: China
Tel: 86-574-88086983
Contact Person:
Mr Richard

O.D. 6 - 350mm Cold Drawn / Cold Rolled Precision Seamless Steel Tube 20# 45

Brand Name : Torich
Model Number : GB/T3639-1983
Certification : ISO9001
Place of Origin : China
MOQ : 1000kg
Price : 600-1000 USD per ton
Payment Terms : L/C, T/T
Supply Ability : 50000tons per year
Delivery Time : 3-4 weeks
Packaging Details : In bundles in wooden box
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Cold drawn or cold-rolled precision seamless steel tubes


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


Steel gradedeliver conditions
+C+LC+SR+A+N
Rm/MpaA/%Rm/MpaA/%Rm/MpaReH/MpaA/%Rm/MpaA/%Rm/MpaReH/MpaA/%
No less than
104308380104003001633524320-45021527
20550552085203751239021440-57025521
355905550751017≥46028021
456454630659014≥54034018
Q345B640458075804501045022490-63035522

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


Wall thickness(S)/extrernal diameterPermissible tolerance
S/D≥1/20According to the specified value of the table 1
1/40≤S/D<1/80According to 1.5 times of specified value of the table 1
S/D<1/40According to double of specified value of the table 1

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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O.D. 6 - 350mm Cold Drawn / Cold Rolled Precision Seamless Steel Tube 20# 45 Images

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