JIS G3101 SS400 SSAW Pipe
JIS G3101 SS400 SSAW Pipe: General Structural Steel Spiral Submerged Arc Welded Pipe
Comprehensive material data for JIS G3101 SS400 steel used in spiral submerged arc welded (SSAW) pipes, including chemical composition, mechanical properties, thermal and electrical properties, equivalent grades, similar materials, and application guidance.
Available processing routes: cutting, bending, welding (including SSAW, ERW), machining, drilling, and cold forming. Suitable for hot-dip galvanizing.
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JIS G3101 SS400 SSAW Pipe Introduction
JIS G3101 SS400 is a general structural hot-rolled steel widely used for welded structures, including spiral submerged arc welded (SSAW) pipes. It is characterized by moderate strength, good weldability, and excellent formability, making it suitable for a variety of construction and engineering applications. The material is supplied in the as-rolled, normalized, or equivalent condition, and is not intended for heat treatment. SS400 provides a minimum tensile strength of 400–510 MPa, with yield strength depending on thickness. Typical applications include building frames, bridges, shipbuilding, storage tanks, and piling pipes. Its balanced composition ensures reliable performance in welded assemblies without requiring preheating for moderate thicknesses.
JIS G3101 SS400 SSAW Pipe Chemical Composition
Chemical composition of SS400 steel as specified in JIS G3101. Values are maximum unless a range is indicated. The composition is designed to provide good weldability and moderate strength without requiring special alloy additions. Carbon equivalent (CEV) is typically controlled for SSAW pipe applications to ensure weldability.
| Element | Standard Value (≤%) | Remarks |
|---|---|---|
| Carbon (C) | 0.050 – 0.250 | Depending on thickness; actual range controlled for weldability |
| Silicon (Si) | – | Not specified; typically ≤0.40 |
| Manganese (Mn) | ≤1.60 | For thickness ≤50 mm; may be lower for thinner gauges |
| Phosphorus (P) | ≤0.050 | Strictly controlled for ductility |
| Sulfur (S) | ≤0.050 | Restricted for improved weldability and toughness |
JIS G3101 SS400 SSAW Pipe Thermal and Electrical Physical Properties
Typical physical properties at room temperature for generic low‑carbon structural steel comparable to SS400. These are not formally specified in JIS G3101 but are widely accepted engineering values. Variations may occur due to exact composition and processing.
| Property | Typical Value | Unit | Test Condition / Remarks |
|---|---|---|---|
| Density (ρ) | 7.85 | g/cm³ | At 20°C |
| Elastic Modulus (E) | 200 – 210 | GPa | At 20°C |
| Shear Modulus (G) | 79.3 | GPa | Calculated from E and Poisson's ratio |
| Poisson's Ratio (ν) | 0.29 – 0.30 | - | Elastic range |
| Thermal Expansion (α) | 11.7 × 10⁻⁶ | K⁻¹ | 0–100°C |
| Thermal Expansion (α) | 12.5 × 10⁻⁶ | K⁻¹ | 0–200°C |
| Thermal Conductivity (λ) | 51.9 | W/(m·K) | At 20°C |
| Specific Heat Capacity (c) | 486 | J/(kg·K) | At 20°C |
| Electrical Resistivity (ρ_e) | 0.159 | Ω·mm²/m | At 20°C |
JIS G3101 SS400 SSAW Pipe Mechanical Properties
Mechanical properties according to JIS G3101 for SS400. Values depend on product thickness. For SSAW pipes, the base metal properties are as per the steel grade used. The yield strength limit denotes ReH (upper yield) or Rp0.2. Bend test requirements are based on plate thickness. Impact toughness is not specified in the standard but may be agreed upon for certain applications.
| Property Item | Standard Requirement | Unit | Test Condition / Remarks |
|---|---|---|---|
| Yield Strength (ReH/Rp0.2) | ≥245 | MPa | Thickness ≤16 mm |
| Yield Strength (ReH/Rp0.2) | ≥235 | MPa | Thickness >16 mm and ≤40 mm |
| Yield Strength (ReH/Rp0.2) | ≥215 | MPa | Thickness >40 mm and ≤100 mm |
| Tensile Strength (Rm) | 400 – 510 | MPa | All thicknesses |
| Elongation (A) | ≥21 | % | Gauge length 200 mm, thickness ≤5 mm |
| Elongation (A) | ≥17 | % | Gauge length 200 mm, thickness >5 mm and ≤16 mm |
| Elongation (A) | ≥21 | % | Gauge length 50 mm, thickness ≤5 mm (or No.5 test piece) |
| Elongation (A) | ≥17 | % | Gauge length 50 mm, thickness >5 mm and ≤16 mm (No.5 test piece) |
| Elongation (A) | ≥23 | % | Gauge length 200 mm, thickness >16 mm and ≤50 mm |
| Elongation (A) | ≥18 | % | Gauge length 50 mm, thickness >16 mm and ≤50 mm (No.5) |
| Bend Test (mandrel diameter) | 180° bend, d=1.5a | - | Thickness ≤25 mm; a = specimen thickness; no cracks |
| Bend Test | 180° bend, d=2.0a | - | Thickness >25 mm and ≤50 mm |
| Bend Test | 180° bend, d=2.5a | - | Thickness >50 mm and ≤100 mm |
| Charpy Impact (KV) | Not specified | J | Optional; typical values at 0°C for SSAW pipe range 27–50 J |
JIS G3101 SS400 SSAW Pipe Exact Equivalent Material Standards and Replaceable Grades
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| Japan | JIS G3101 | SS400 | Original standard; base material for SSAW pipe |
| International | ISO 630-2 | S235B | Comparable general structural steel, yield ~235 MPa |
| USA | ASTM A36/A36M | A36 | Similar carbon structural steel, acceptable substitution |
| Europe | EN 10025-2 | S235JR | 1.0038; close match, with guaranteed impact at +20°C |
| Germany (old) | DIN 17100 | St37-2 | Equivalent to S235JR; frequently interchanged |
| China | GB/T 700 | Q235B | Direct equivalent, widely used for similar applications |
| India | IS 2062 | E250 (Fe 410WA) | Comparable grade with yield min 250 MPa |
JIS G3101 SS400 SSAW Pipe Application Introduction
SS400 SSAW pipes are used extensively in structural and fluid transportation applications. The material's good weldability and ductility make it ideal for thick‑wall spiral welded pipes with diameters up to 3000 mm. Primary industries include:
- Oil & Gas: flowlines, gathering lines, casing pipes
- Water Supply: transmission mains, penstocks
- Construction: structural columns, bracing, foundation piles
- Marine: piling, jetty structures
- Mining: slurry transport, ventilation ducts
Product Applications: Spiral submerged arc welded (SSAW) pipes (outside diameter 219–3000 mm, wall 5–25 mm), Longitudinal seam welded pipes and ERW tubes, Hot‑rolled plates and sheets, Structural beams, channels, angles, Pipe piles and foundation tubes, Storage tanks and silos, Bridge and flyover structural elements
Processed into products: Pipe couplings and flanges, Pipe elbows, tees, reducers (welded fittings), Casing spacers and centralizers, Structural steel brackets, stiffeners, base plates, Anchor cages for foundations, Ventilation ducts and fume extraction hoods, Handrails, guardrails, and safety barriers
Application industries: Oil and gas (low‑pressure transmission, gathering lines, conductor casing), Water and wastewater (main pipelines, distribution, treatment plants), Civil engineering and construction (bridge piling, foundation piles, structural tubes), Marine and offshore (dolphins, berthing structures, fender piles), Mining (slurry transport, process piping, ventilation), Agriculture (irrigation pipes, greenhouse structures), General fabrication (handrails, signposts, structural hollow sections)
JIS G3101 SS400 SSAW Pipe Similar and Alternative Material Grades
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| Japan | JIS G3106 | SM400A/B | Higher toughness; often used for welded structures |
| Japan | JIS G3131 | SPHC | Hot-rolled mild steel; lower strength, used for forming |
| USA | ASTM A283/A283M | Grade D | Lower strength structural carbon steel |
| USA | ASTM A572/A572M | Grade 42, 50 | High-strength low-alloy; may substitute with weld consideration |
| Europe | EN 10025-2 | S275JR | Higher strength option; approx. yield 275 MPa |
| China | GB/T 700 | Q235A | Lower toughness but similar strength; not for critical welds |
| Russia | GOST 380 | St3sp | Common structural steel comparable to SS400 |
Notes:
Welding considerations: SS400 has a carbon equivalent (CE) typically below 0.40%, providing good weldability without preheat for thicknesses up to 30 mm at ambient temperatures. For SSAW pipe production, submerged arc welding with high‑speed spirally forming ensures deep penetration and consistent quality. Inspection: Pipes may be subjected to hydrostatic testing per API 5L or customer specifications, though not mandatory in JIS G3101. Surface condition: As‑rolled or lightly oiled; pipe ends may be plain or bevelled for welding. Ordering note: When ordering SS400 SSAW pipe, specify outside diameter, wall thickness, length, end finish, and any supplementary test requirements (e.g., Charpy impact, UT inspection).
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