Seamless Steel Pipe line, Line pipe

Line pipe is the line pipe that belongs to the American Petroleum standard pipe, line pipe is out of the ground oil, gas, water, transportation by pipeline to the oil and gas industry enterprises.

Line pipe is including seamless pipe and welded steel pipe, the pipe end plain, end with threaded ends, and the order of the port side, its connection to the end of the first welding coupling connections, socket connections.

Dimension Tolerance:

Steel Pipe Specification Steel Pipe Outside Diameter (D) Steel Pipe Wall Thickness (S)
Pipe Body (mm) Allowable deviation
(mm)
(mm) Allowable Deviation
(mm)
≥60.3 and < 20 ±0.75% ≤73.0 +15%, -12.5%
≥60.3 and S≥20 ±1.00% >73.0且S<20 +15%, -12.5%
    >73.0且S≥20 +17.5%, -10


Mechanical Property:

Standard Model Tensile Strength(MPa) Yield Strength(MPa) Yield Strength
Ratio
Tensile Stretch(%) Ballistic Work
Akv(J)
Heat Treatment
State
API SPEC 5L

GB/T9711.2
B ≥415 245-440 ≤0.80 22 ≥40 normalizing
X42 ≥415 290-440 ≤0.80 21 ≥40 normalizing
X52 ≥460 360-510 ≤0.85 20 ≥40 normalizing
X60 ≥520 415-565 ≤0.85 18 ≥40 normalizing
X65 ≥535 450-570 ≤0.90 18 ≥40 quencher backfire
X70 ≥570 485-605 ≤0.90 18 ≥40 quencher backfire


Chemical constituent:

Standard Model Chemical Constituent(%) CEV(%)
C Si Mn P S V Nb Ti
API SPEC 5L

GB/T9711.2
B ≤0.16 ≤0.40 ≤1.10 ≤0.020 ≤0.010 ≤0.42
X42 ≤0.17 ≤0.40 ≤1.20 ≤0.020 ≤0.010 ≤0.05 ≤0.05 ≤0.04 ≤0.42
X52 ≤0.20 ≤0.45 ≤1.60 ≤0.020 ≤0.010 ≤0.10 ≤0.05 ≤0.04 ≤0.45
X60 ≤0.21 ≤0.45 ≤1.60 ≤0.020 ≤0.010 ≤0.15 ≤0.05 ≤0.04 agreement
X65 ≤0.16 ≤0.45 ≤1.60 ≤0.020 ≤0.010 ≤0.06 ≤0.05 ≤0.06 ≤0.45
X70 ≤0.16 ≤0.45 ≤1.70 ≤0.020 ≤0.010 ≤0.06 ≤0.05 ≤0.06 ≤0.45

Standard

Applications

Main Steel Pipe Model




Seamless pipe Specification, standard and identification

Seamless pipes are extensively applied for the nuclear device, gas, petrochemical, ship building and boiler industries. Seamless pipes dominates 65% of market share in Chinese boiler industry.