Key Requirements for Steel Pipes in the Pipeline Service Industry

Requirement Category                          Details

Mechanical Properties                                High yield strength, good ductility (elongation ≥ 20%), impact resistance

                                                                     (especially low-temperature toughness)

Weldability                                                    Easy field welding, weld strength matching base metal, HAZ toughness compliant

Corrosion Resistance                                  External coating required (e.g., 3LPE, FBE); internal lining or coating (cement

                                                                     mortar or polymer)

Non-Destructive Testing                            100% ultrasonic radiographic inspection (seamless), full weld inspection(welded)

Dimensional Accuracy                               Tight tolerances on outer diameter and wall thickness for proper fit-up and weld

Environmental Adaptability                      Submarine pipes must resist pressure and seawater corrosion; permafrost

                                                                    regions require low-temperature impact resistance

Hebei K-Steel Pipe Industry can supply all kinds of steel pipe.

API 5L‌ (Line Pipe Standard, Globally Used)

‌Application‌: Long-distance oil and gas transmission, urban gas networks.

‌Grades‌:

‌Grade B‌: Basic carbon steel, yield strength ≥ 240 MPa

‌X42/X52/X60/X70/X80‌: High-strength line pipe; the number indicates minimum yield strength in ksi (e.g., X70 ≥ 485 MPa)

‌Manufacturing Methods‌: Seamless or welded (ERW, LSAW, SSAW)

‌Features‌: Widely used in onshore and offshore pipelines; requires DWTT (Drop Weight Tear Test) for low-temperature toughness verification.

ASTM A106 Gr.B‌ (Seamless Carbon Steel Pipe for High-Temperature Service)

‌Application‌: High-temperature fluid transport within refineries.

‌Material Properties‌: Carbon <0.30%, Mn 0.29%-1.06%, tensile strength ≥485MPa

‌Advantages‌: Good weldability and thermal stability, suitable for high-load non-long-distance applications.

ASTM A53‌ (Welded and Seamless Carbon Steel Pipe)

‌Application‌: Low-pressure fluid transport, structural supports.

‌Types‌:

‌Type E‌: ERW welded

‌Type S‌: Seamless

‌Grades A/B‌: Grade B is more common with higher strength

‌Use Cases‌: Plant internal piping and support structures, not suitable for high-pressure long-distance transmission.

GB/T 9711-2023‌ (Welded and Seamless Steel Pipes for Petroleum and Natural Gas Industries in China)

‌Application‌: Domestic oil and gas trunk pipelines.

‌Equivalent to API 5L‌: Technically aligned, divided into PSL1 (basic) and PSL2 (enhanced requirements)

‌Typical Materials‌: L245NB / L415MB (equivalent to X42/X70)

‌Requirements‌: PSL2 mandates strict control on chemistry, impact energy, DWTT, and NDT coverage.

Polyethylene (PE) Pipes (e.g., PE100)‌

‌Application‌: Urban gas distribution, water supply networks.

‌Standards‌: ISO 4437 (gas), ISO 4427 (water)

‌Features‌:

Corrosion-resistant, flexible, fewer joints

Operating pressure typically ≤ 1.0 MPa

Suitable for low-to-medium pressure, non-high-temperature environments