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L245N line pipe implementation standard - GB/T9711-2017 Chinese standard.
Gr.BN seamless steel pipe implementation standard - API SPEC 5L American standard.
L245N seamless steel pipe is a national standard material for pipeline pipes used in the oil and gas industry.
Chinese standard materials also include L290N, L360N, L390N, L415N, etc.
Gr.B is the American standard material, including: X42N, X46N, X52N, X56N, X60N, etc. Although the implementation standards of the two are different, the material performance is the same, and they can be used instead of each other.
| Grade | C | Si | Mn | V | NB | S | P | TI |
| L245N | ≤0.28 | ≤0.40 | ≤1.2 | ≤0.06 | ≤0.010 | ≤0.10 | ≤0.020 | ≤0.04 |
| Grade | Yield Strength (MPa) | Ultimate Tensile Strength (MPa) | Elongation at Break (%) |
| L245N | 245-440 | 415 | 22 |
Product name | Material | Standard | Size(mm) | Application |
GB/T18984- | GB/T18984- | OD:8-1240* | Apply to - 45 ℃ ~ 195 ℃ low temperature pressure vessel and low temperature heat exchanger pipe | |
High-pressure boiler tube | 20G | GB5310-1995 | OD:8-1240* | Suitable for manufacturing high pressure boiler tube, header, steam pipe, etc |
10 | GB9948-2006 | OD: 8-630* | Used in oil refinery furnace tube, heat exchanger tube | |
10# | GB3087-2008 | OD:8-1240* | Suitable for manufacturing various structure of low and medium pressure boiler and locomotive boiler | |
of the tube | 10#,20#,45#,27SiMn | GB/T8162- | OD:8-1240* | Apply to the general structure, engineering support, mechanical processing, etc |
J55,K55,N80,L80 | API SPEC 5CT | OD:60-508* | Used for extraction of oil or gas in oil Wells casing, used in oil and gas well sidewall |
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