S235 / S275 / S355 Quick Comparison

S235JR: Yield strength 235MPa, suitable for low-pressure, shallow-buried, and temporary projects with extremely low budgets;

S275JR: Yield strength 275MPa, suitable for medium-pressure water conveyance, conventional outdoor pile foundations, and is the preferred choice for balanced cost-effectiveness;

S355JR: Yield strength 355MPa, suitable for high-pressure deep burial, heavy-duty bridges, and thick-walled heavy-duty casings.

Three Types of Welded Pipe Specification Ranges:

ERW High-Frequency Straight Seam Welded Pipe (EN10219): Outer diameter 21.3–610mm, wall thickness 1.5–16mm; precise dimensions, fast delivery, mostly used for small steel structures and low-pressure water pipes.

SSAW Spiral Submerged Arc Welded Pipe (EN10217-5): Outer diameter 219–3620mm, wall thickness 6–36mm; primarily used for ultra-large diameter water conveyance, river channels, bridge pile foundations, with oblique welds to resist foundation settlement.

LSAW Straight Seam Submerged Arc Welded Pipe: Outer diameter 406–1620mm, wall thickness 10–50mm; used for thick-walled, medium-pressure fluids, and heavy-duty support applications.

Product information：

Chemical composition (%)

Each pipe must undergo: hydrostatic testing, ultrasonic flaw detection of welds, and dimensional and visual inspection;

Batch sampling inspection: tensile, bending, and corresponding temperature impact tests;

EN10204 3.1/3.2 material certificates and CE compliance documents are available to meet EU customs clearance and tendering requirements.

Surface finishes: bare black pipe, hot-dip galvanized, 3PE, FBE, and epoxy coal tar anti-corrosion.

Core Advantages

Optimal Balance of Strength and Cost:Bearing capacity higher than S235, purchase price lower than S355, the most economical choice for medium pressure and medium burial depth projects;

European Standard Compliance:Recognized by municipal and steel structure tenders in EU countries, with complete certifications, eliminating the risk of non-compliance;

Good Processing Performance:Low-carbon formula, less prone to cracking during on-site beveling welding, flange connections, cold bending, and hot-dip galvanizing;

Full Diameter Coverage:One-stop supply of small-diameter ERW and large-diameter spiral/straight seam submerged arc welding, with supporting engineering procurement;

Multiple Low Temperature Ratings Available:Three impact ratings: ambient temperature, 0℃, and -20℃, suitable for various global climates.

Applicable Engineering Scenarios:

Structural Uses (EN10219):Factory building supports, general bridge pile foundations, temporary foundation pit support, road guardrails, small steel structure columns.

Pressurized Fluids (EN10217-5):Urban medium-pressure tap water, stormwater and sewage pipe networks, factory circulating water, farmland irrigation, and residential low-pressure gas branch lines.

Core Advantages

Optimal Balance of Strength and Cost:Bearing capacity higher than S235, purchase price lower than S355, the most economical choice for medium-pressure, medium-depth projects;

European Standard Compliance:Recognized by municipal and steel structure tenders in EU countries, with complete certifications, eliminating the risk of non-compliance;

Excellent Processing Performance:Low-carbon formula, less prone to cracking during on-site beveling welding, flange connections, cold bending, and hot-dip galvanizing;

Full Diameter Coverage:One-stop supply of small-diameter ERW and large-diameter spiral/straight seam submerged arc welding, with supporting engineering procurement;

Multiple Low Temperature Ratings:Three impact ratings: ambient temperature, 0℃, and -20℃, suitable for various global climates and construction environments.