ASTM A500 Grade D ERW Pipe Material
ASTM A500 Grade D ERW Pipe - Structural Tubing Properties & Equivalents
Complete technical data for ASTM A500 Grade D ERW structural steel pipe, including chemical, mechanical, thermal properties, international equivalents and applications.
Electric-resistance welding (ERW), cold forming, hot-dip galvanizing, cutting, bending, punching, welding, machining.
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ASTM A500 Grade D ERW Pipe Introduction
ASTM A500 Grade D is a cold-formed, electric-resistance welded (ERW) carbon steel structural tubing grade, primarily produced in round, square and rectangular shapes. It is specified in ASTM A500/A500M standard for structural applications.
- Minimum yield strength of 250 MPa (36 ksi) and tensile strength of 400 MPa (58 ksi)
- Good weldability and formability
- Available in circular hollow sections with varying wall thickness
- Widely used in construction, machinery, and general engineering
- Can be galvanized for enhanced corrosion resistance
ASTM A500 Grade D ERW Pipe Chemical Composition
ASTM A500 does not mandate chemical composition; the steel must meet mechanical requirements. The values below are typical for carbon steel used in Grade D structural tubing. Note: When copper steel is specified, Cu ≥ 0.20%.
| Element | Typical Value | Remarks |
|---|---|---|
| Carbon (C) | ≤ 0.26 | Typical for wall ≤ 12.7 mm; fracture toughness requirement |
| Manganese (Mn) | ≤ 1.35 | Contributes to strength |
| Phosphorus (P) | ≤ 0.035 | For improved ductility |
| Sulfur (S) | ≤ 0.035 | Limits inclusion content |
| Silicon (Si) | 0.15 – 0.40 | Deoxidation practice (optional) |
| Copper (Cu) | ≥ 0.20 (if specified) | For enhanced atmospheric corrosion resistance |
ASTM A500 Grade D ERW Pipe Thermal and Electrical Physical Properties
Typical values for carbon steel at ambient temperature unless noted. Thermal conductivity decreases with temperature; resistivity increases slightly with alloying.
| Property | Typical Value | Unit | Test Condition |
|---|---|---|---|
| Density (ρ) | 7.85 | g/cm³ | Ambient |
| Modulus of Elasticity (E) | 200 | GPa | Tension, room temperature |
| Shear Modulus (G) | 80 | GPa | Calculated from E and ν |
| Poisson's Ratio (ν) | 0.30 | - | Within elastic range |
| Thermal Expansion Coeff. (α) | 11.7 | µm/m·°C | 20–100 °C |
| Thermal Conductivity (λ) | 51.9 | W/m·K | At 20 °C |
| Specific Heat Capacity | 486 | J/kg·K | Ambient |
| Electrical Resistivity (ρ_e) | 0.15 | µΩ·m | At 20 °C |
ASTM A500 Grade D ERW Pipe Mechanical Properties
Tested in accordance with ASTM A500 requirements for circular hollow sections. Bend test: Cold bend 180° around a mandrel without cracks; bend radius depends on D/t ratio. Elongation measured over a 50 mm (2 in.) gauge length.
| Property | Required Value | Unit | Test Condition |
|---|---|---|---|
| Yield Strength (ReH) | ≥ 250 | MPa | Transverse strip test, 0.2% offset |
| Tensile Strength (Rm) | ≥ 400 | MPa | Transverse strip test |
| Elongation (A) | ≥ 21 | % | 50 mm gauge length |
| Bend Test (180°) | No cracks | - | Mandrel diameter: 2×OD (D/t ≤ 6); 3×OD (D/t > 6) |
ASTM A500 Grade D ERW Pipe Fully Equivalent Material Standards and Alternative Grades
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| USA | ASTM A500/A500M | Grade D | Base specification – ERW structural tubing |
| Europe | EN 10219-1 | S275JRH | Cold-formed welded structural hollow section; yield 275 MPa, slightly higher strength |
| Japan | JIS G3466 | STKR400 | Square/rectangular carbon steel tube; yield ≥ 235 MPa, tensile ≥ 400 MPa (similar range) |
| International | ISO 10799-2 | S275JRH | Cold-formed welded structural hollow sections – compatible |
| Australia/New Zealand | AS/NZS 1163 | C275 (approximate) | Structural steel hollow sections; yield 275 MPa (C275LO) – near match |
ASTM A500 Grade D ERW Pipe Application Introduction
ASTM A500 Grade D ERW steel tube is versatile for structural and mechanical applications. Its weldability and moderate strength allow it to be used in a wide range of industries.
Product Applications: Building columns and beams, Scaffolding, Roll-over protective structures (ROPS), Trailer frames, Grain handling systems, Playground equipment
Processed into products: Telescopic legs and supports, Conveyor idler rolls, Sign and lighting poles, Handrails and guardrails, Machinery cross-members, Greenhouse structures
Application industries: Construction, Machinery Manufacturing, Agricultural Equipment, Automotive, Furniture, Infrastructure (sign supports, guardrails)
ASTM A500 Grade D ERW Pipe Similar/Closely Matching Material Recommendations
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| USA | ASTM A53/A53M | Grade B | ERW pipe for pressure / mechanical applications; yield ≥ 240 MPa, tensile ≥ 415 MPa – lower yield |
| USA | ASTM A135/A135M | Grade B | Electric-resistance welded steel pipe; yield ≥ 35 ksi (241 MPa) – close properties |
| USA | ASTM A795 | Type S, Grade B | ERW steel pipe for fire protection; similar strength but intended for sprinkler systems |
| International | API 5L | B (PSL 1) | Line pipe; yield ≥ 245 MPa, tensile ≥ 415 MPa – slightly lower yield, often seamless or ERW |
| Europe | EN 10210-1 | S275J0H | Hot-finished structural hollow section; yield ≥ 275 MPa – higher strength, thicker wall availability |
Notes:
Welding: ERW Grade D can be welded using standard SMAW, GMAW, and GTAW processes; preheat is usually not required for sections ≤ 50 mm thick. Galvanizing: Hot-dip galvanizing is common; ensure proper drainage and venting of hollow sections to avoid zinc entrapment. Supply condition: Available in cut lengths, often with mill test reports (MTRs) confirming mechanical properties. Dimensions per ASTM A500 are referenced to the minimum wall thickness, subject to tolerances.
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