Marine: full name is the ship by tube, its main use is used in shipbuilding, ship tube performance with other seamless steel tube (such as 20 # seamless steel tube, 45 # seamless steel tube) compared with high corrosion resistance performance, high performance and high temperature resistant properties. The ship is 410, main material, its implementation and 440 490 standard is: T5312-1999 (GB/full-auto pipe extrusion, rolling, general specification limits) : 14-45 * 1.5-60. Seamless steel pipe size and the allowable deviation error level standardization outside the allowable deviation
D1 ± 1.5%, minimum ± 0.75 mm
D2 ± 1.0%. The minimum ± 0.50 mm
D3 ± 0.75%. Minimum ± 0.30 mm
D4 ± 0.50%. The minimum ± 0.10 mm