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Mill test certificate round cold drawn schedule 20 steel pipe/steel tube

Cold drawn seamless steel tube with high precision,excellent brightness. It can used for gas spring, shock absorber,automotive &motorcycle spare parts etc

  • RAY STEEL TUBE

  • STKM11A/A106 Gr.A/St35.8/STKM13A/STKM13B/A106Gr.B/A53.B/1045 (45#)/St52 /16Mn/E355/4130 etc

  • OD:10-65 mm , Thickness: 1-8 mm

  • Cold drawn

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Material Carbon Steel and Alloy Steel
Section Shape Round
Surface treatment Oiled, Annealing etc
Outer Diameter 6-65mm
Wall Thickness 1-8mm
Seamless Steel Tube Standard DIN2391, DIN17175, ASTM A106, ASTM A213, ASTM A53, ASTM A312,     ASTM A179, SAE 4130. JIS G3445, JIS G3444, JIS G 3461, JIS G3441, JIS G3454 etc
Steel Tube Grade 1010 (10#, STS38,STKM11A,STKM12A,STKM13C, A106 Gr.A,St35.8, St37,St35,E215 etc)                                     1020 (20#, STPG42,STKM12B,STKM12C,STKM13A,STKM13B,A106Gr.B, A53.B, St45.8,St44, St45, E235 etc)      1045 (45#),St52 (16Mn, E355),30CrMo(4130)
Packing Details 1.Internal wrapped with plastic film. External wrapped with woven bags.
2. wooden boxes to pack.
3. Iron stand.
Certification ISO9001
Delivery condition BK BKW BKS GBK NBK
Length 1-12m as customer's requestment


Dimension tolerance comparision Chart
 Outside Diameter      GB/T 3639            DIN2391(EN10305)  RAY  steel tube               standard    Special standard   
       6-30mm        +/-0.1 mm            +/-0.08 mm       +/-0.05 mm        +/-0.03 mm
      31-40mm        +/-0.15 mm            +/-0.15 mm       +/-0.05 mm        +/-0.03 mm
      41-50mm        +/-0.20 mm            +/-0.20 mm       +/-0.05 mm        +/-0.03 mm
      51-60mm        +/-0.25 mm            +/-0.25 mm       +/-0.08 mm        +/-0.03 mm
      61-65mm        +/-0.30 mm            +/-0.30 mm       +/-0.10 mm        +/-0.05 mm
     Thickness        +/-0.12 mm            +/-0.10 mm       +/-0.05 mm

       +/-0.03












    The production flow chart of seamless steel tube:

QQ图片20171018180801.png

The Chemical composition comparison sheet:


Steel Grade        C      Si     Mn         S         P       Cr        Ni     Cu
 1010 0.08-0.13 0.15-0.35 0.30-0.60    ≤0.030    ≤0.030     ≤0.20     ≤0.25    ≤0.25
 STKM 11A    ≤0.12    ≤0.35     ≤0.60    ≤0.040     ≤0.040


 1020 0.17-0.23 0.15-0.35 0.30-0.60    ≤0.050     ≤0.040


STKM13A     ≤0.25     ≤0.35 0.30-0.90     ≤0.20     ≤0.040    ≤0.040

A106 Gr.B     ≤0.25     ≤0.10 0.29-1.06     ≤0.035     ≤0.40     ≤0.40     ≤0.40    ≤0.40

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