20 Years of Experience in Seamless Steel Tube Production

FAQ Category

FAQ

  • Q Q: What is precision tolerance tolerance of tube?

    A A: 

    Name Scope GB Series DIN series mm
    Enterprise internal control 
    standards mm
    Special high-precision mm
    OD 4~30 ±0.10 ±0.08 ±0.05 ±0.03
    31~40 ±0.15 ±0.15 ±0.05 ±0.03
    41~50 ±0.20 ±0.20 ±0.08 ±0.03
    51~60 ±0.25 ±0.25 ±0.08 ±0.03
    Wall 0.5~7 ±10%;MIN±0.12 ±10% ±10%;MIN±0.05 ±10%;MIN±0.03

  • Q Q: What is precision tolerance tolerance of tube?

    A A:

    Specification Specification Specification Specification Specification
    Out diameter In diameter Out diameter In diameter Out diameter In diameter Out diameter In diameter Out diameter In diameter
    D 6mm Φ1.0 D 6.35mm Φ1.0 D 7mm Φ1.0 D 8mm Φ2.0 D 15mm Φ3.0
    Φ1.2 Φ1.2 Φ1.2 Φ3.0 Φ4.0
    Φ1.4 Φ1.4 Φ1.4 D 9mm Φ2.0 Φ5.0
    Φ1.5 Φ1.5 Φ1.5 Φ3.0 D 16mm Φ4.0
    Φ1.6 Φ1.6 Φ1.6 D 10mm Φ2.0 Φ5.0
    Φ1.8 Φ1.8 Φ1.8 Φ3.0 Φ6.0
    Φ2.0 Φ2.0 Φ2.0 D 12mm Φ2.0

    Φ2.2 Φ2.2 Φ2.2 Φ3.0
    Φ2.4 Φ2.4 Φ2.4 Φ4.0
    Φ2.6 Φ2.6 Φ2.6 D 14mm Φ3.0
    Φ3.0 Φ3.0 Φ3.0 Φ4.0

  • Q Q: What is the pressure resistance of the tube?

    A A: The pressure table of tube   Download
  • Q Q: What is the delivery time of tube?

    A A: Our products will be delivered within 30 days.
  • Q Q: How long can the tube be stored?

    A A: 
         NBK 1 years without rust

         NBK+Phosphated 2 years without rust

         NBK+Galvanized 3 years without rust

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