EN 10025 Carbon steel tubing for structural/fluid applications. Product types: Seamless steel tubing (SMLS), straight seam welded tubing (ERW), structural square and rectangular tubing.

Main export materials: S235JR, S275JR, S355JR (most common); S355J0/J2 (low-temperature type). Applicable scenarios: Building structures, bridges, machinery manufacturing, fluid transportation (water/oil/gas), steel structure supports, low-pressure pipelines.

Material Introduction:

S235JR (1.0038) – General purpose basic grade. Low carbon structural steel, C≤0.17%, yield strength ≥235MPa. Excellent plasticity, excellent weldability, low cost.

Applications: Normal temperature, light structures, low-pressure fluids, ordinary steel structures.

S275JR (1.0044) – Medium strength general purpose grade. Medium carbon manganese steel, C≤0.21%, Mn≤1.50%. Strength higher than S235, balanced overall performance

Suitable for: Medium-sized steel structures, crane beams, mechanical structures, medium-pressure fluids

S355JR (1.0553) – High-strength mainstream. Low-alloy high-strength steel, C≤0.24%, with added Mn/Si/Nb/V. Yield strength ≥355MPa, high strength and high toughness

Suitable for: Heavy structures, bridges, high-rise buildings, construction machinery, high-pressure fluids

Product Advantages

The only globally universal pipeline standard. API/ISO dual certification, suitable for North America, the Middle East, Central Asia, Southeast Asia, and Australia; a mandatory standard for oil and gas projects.

Full strength coverage, precise selection: From Gr.B (245MPa) to X70 (485MPa), precisely matched to pressure/distance/environment.

High-pressure reduced wall thickness: X65 reduces wall thickness by 30% compared to Gr.B, saves 25% on consumables, and lowers transportation costs by 15%.

Leading PSL2 corrosion/crack resistance: Ultra-low sulfur and phosphorus (S≤0.015%) + microalloyed fine grains: Resistant to H₂S stress corrosion cracking (SSCC) and hydrogen-induced cracking (HIC).

Meets NACE MR0175, ensuring a safe service life of 30+ years in high-sulfur gas fields.

Globally compatible welding/construction: Ceq≤0.43, low risk of cold cracking during welding; standard welding rods/wires are sufficient.

Compatible with ASME B31.8 and ISO standards. 13628, stable performance in threading, beveling, bending, and welding. Complete specifications, fast delivery. Seamless: DN15~DN1000 (Φ21.3~1016mm) Welded pipe: DN200~DN2000 (Φ219~2134mm) Wall thickness: Sch 40/80/XS/XXS, SDR; Length: 6m/12m/24m

Chemical composition (mass fraction %)

Mechanical properties

Statistics on the popular models and common specifications of carbon steel pipes

Select materials based on application

For general fluid transportation (water, gas, oil): 20#, Q235B, A53 Gr.B, STPG370

The best cost-performance ratio, globally applicable

For high-temperature / steam / boiler pipes: A106 Gr.B, 20G, 15CrMoG, P235TR1/P235GH

Better resistance to high temperature and pressure

For oil and gas pipelines: API 5L Gr.B, X42, X52, X60

High strength and good toughness, suitable for long-distance pipelines

For low-temperature environments (cold storage, LNG support): A333 Gr.1/Gr.3, 16MnDG

Resistant to low temperature without cracking

For structural pipes (supports, machinery, steel structures): Q355B (old 16Mn), St44.2, A36

High strength and good load-bearing capacity