无缝钢管线，线管

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.

尺寸容差：

Steel Pipe Specification 钢管外直径（D） Steel Pipe Wall Thickness (S)
管体 （毫米） Allowable deviation
（毫米）		 （毫米） 允许偏差
（毫米）
≥60.3 and < 20 ±0.75％ ≤73.0 ＋15％, －12.5％
≥60.3和s≥20 ±1.00％ ＞73.0且S＜20 ＋15％, －12.5％
＞73.0且S≥20 ＋17.5％, －10


Mechanical Property:

Standard 模型 Tensile Strength(MPa) Yield Strength(MPa) Yield Strength
比率		 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


化学成分：

Standard 模型 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规范，标准和识别

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.