API 5L Φ219×6.4、Φ323×8 High Precision Seamless Carbon Steel Pipe Hollow Round Square Rectangle Pipe

Type: High-precision cold-drawn seamless tube Standard: GB/T3639-2018, GB/T 5777-2008,the technology agreement Material steel: 45#, 16Mn(Q345B), 25Mn, 27SiMn, SY720, ZNP460 Internal diameter Tolerance: H8, H9,H10 Straightness rate/roundness rate/mechanical performance : As agreement Chrome-plated As request Size: 100mm-500mm Shape: Round, square Package: As request Usage: 1. For hydraulic cylinder's outside cylinder and piston rod; 2. For transportation of natural gas, oil,