Product Introduction
Product description
● Standard
GB/T5312-2009
● Uses
For the manufacture of marine boilers, superheaters and pressure-resistant pipes
● Deviation
Allowable deviation of outer diameter and wall thickness
Outer diameter D | Hot rolled tube | Diameter size mm | ≤ 159 | > 159 | |
Allowable deviation % | ± 1.0 | ± 1.25 | |||
Cold-drawn tube | Diameter size mm | ≤ 30 | > 30~50 | > 50 | |
Allowable deviation | ± 0.20mm | ± 0.30mm | ± 0.8% | ||
Wall thickness S | Hot rolled tube | Wall thickness mm | 3 < S ≤ 20 | S > 20 | |
Allowable deviation % | +15-10 | ± 10 | |||
Cold-drawn tube | Wall thickness mm | 1.5~3 | > 3 | ||
Allowable deviation % | +12-10 | ± 10 | |||
Product details
