ASTM A283 Grade C ERW Pipe
ASTM A283 Grade C ERW Pipe: Chemical, Mechanical & Thermal Data
Detailed material data for ASTM A283 Grade C carbon steel used in ERW pipes: chemical composition, mechanical & physical properties, equivalent international standards, and application guide.
Electric Resistance Welding (ERW), hot rolling, cold forming, welding, machining, bending
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ASTM A283 Grade C ERW Pipe Introduction
ASTM A283 Grade C is a low-carbon structural steel widely used for general construction and fabrication. When produced as electric resistance welded (ERW) pipe, it is formed from hot-rolled steel coils, welded, and typically supplied in the as-rolled condition. Key characteristics include:
- Good weldability and formability
- Moderate strength suitable for structural applications
- Widely available and cost-effective
- Suited for non-critical fluid transmission and mechanical uses
This grade is covered by ASTM A283/A283M and is not intended for high-temperature or pressure vessel service unless specific additional requirements are met.
ASTM A283 Grade C ERW Pipe Chemical Composition
Heat analysis limits according to ASTM A283/A283M for Grade C. Product analysis tolerances are noted where applicable. Elements not listed are not intentionally added and are limited to residual levels. Key points:
- Silicon is not required for thin flat products but may be specified.
- Copper is optional and may be added for improved atmospheric corrosion resistance (0.20% min when specified).
| Chemical Element | Standard Value (Heat) | Remarks |
|---|---|---|
| C | ≤ 0.24% | Product analysis ≤ 0.26% |
| Mn | ≤ 0.90% | Product analysis ≤ 0.95% |
| P | ≤ 0.030% | - |
| S | ≤ 0.030% | - |
| Si | ≤ 0.40% (when specified) | Not mandatory for typical ERW pipe skelp; if required, max 0.40% |
ASTM A283 Grade C ERW Pipe Thermal and Electrical Physical Properties
Typical physical properties for carbon steel (A283 Grade C). These values are provided as a general reference and are not specification requirements. Actual values may vary slightly with heat treatment and service conditions. Note: Properties are measured at room temperature unless otherwise indicated.
| Property | Typical Value | Unit | Test Condition |
|---|---|---|---|
| Density (ρ) | 7.85 | g/cm³ | 20 °C |
| Modulus of Elasticity (E) | 200 | GPa | 20 °C |
| Shear Modulus (G) | 80 | GPa | 20 °C |
| Poisson's Ratio (ν) | 0.26 – 0.29 | - | 20 °C |
| Thermal Expansion Coefficient (α) | 12.0 × 10⁻⁶ | 1/K | 0 – 100 °C |
| Thermal Expansion Coefficient (α) | 12.8 × 10⁻⁶ | 1/K | 0 – 200 °C |
| Thermal Conductivity (λ) | 52 | W/(m·K) | 20 °C |
| Specific Heat Capacity (cp) | 470 | J/(kg·K) | 20 °C |
| Electrical Resistivity (ρe) | 0.15 × 10⁻⁶ (15) | Ω·m (µΩ·cm) | 20 °C |
ASTM A283 Grade C ERW Pipe Mechanical Properties
Mechanical properties for ASTM A283 Grade C plates (transverse specimens, as-rolled condition) which form the basis of ERW pipe. The pipe body may achieve similar properties, but separate pipe specifications may apply for the finished product. Note: Elongation values depend on thickness and are measured on a 50 mm gauge length. Converted ksi values are given in parentheses.
| Property | Standard Value | Unit | Test Condition |
|---|---|---|---|
| Yield Strength (ReH) | ≥ 205 (≥ 30) | MPa (ksi) | As-rolled, 0.2% offset |
| Tensile Strength (Rm) | 380 – 515 (55 – 75) | MPa (ksi) | As-rolled |
| Elongation (A) | ≥ 25 | % | 50 mm GL, thickness ≤ 20 mm |
| Elongation (A) | ≥ 22 | % | 50 mm GL, 20 < t ≤ 40 mm |
| Elongation (A) | ≥ 21 | % | 50 mm GL, 40 < t ≤ 50 mm |
| Elongation (A) | ≥ 19 | % | 50 mm GL, 50 < t ≤ 100 mm |
| Elongation (A) | ≥ 18 | % | 50 mm GL, t > 100 mm |
| Bend Test (180°) | No cracks | - | Mandrel diameter = 1.5 × thickness (t ≤ 25 mm) |
| Bend Test (180°) | No cracks | - | Mandrel diameter = 2.5 × thickness (25 < t ≤ 50 mm) |
| Bend Test (180°) | No cracks | - | Mandrel diameter = 3.0 × thickness (t > 50 mm) |
ASTM A283 Grade C ERW Pipe Fully Equivalent & Nearest Equivalent Grades
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| USA | ASTM A283/A283M | Grade C | Original specification |
| European Union | EN 10025-2 | S235JR | Closest equivalent; C ≤ 0.20%, Mn ≤ 1.40%, P ≤ 0.035%, S ≤ 0.035%; similar strength but slight composition differences |
| International | ISO 630-2 | E235B (Fe360B) | Similar tensile strength; chemistry limits may vary |
| Japan | JIS G3101 | SS400 | Comparable strength; P and S limits differ (<0.050%); commonly used for general structures |
| China | GB/T 700 | Q235B | Close match; C ≤ 0.20%, Mn 0.30-0.70%, P ≤ 0.045%, S ≤ 0.045%; similar yield but different allowable impurities |
| India | IS 2062 | E250 (Fe410WA) | Similar strength range; composition may differ slightly |
ASTM A283 Grade C ERW Pipe Application Introduction
ASTM A283 Grade C ERW pipe is a versatile carbon steel product suitable for a wide range of non-critical applications. Its good weldability and moderate strength make it a popular choice where cost efficiency and ease of fabrication are important. Typical thicknesses range from 1.2 mm to 16 mm for ERW pipe, depending on diameter.
Product Applications: ERW structural pipes and hollow sections, Water and gas transmission pipelines (low-pressure), Storage tanks and silos, Bridge and building frameworks, Agricultural equipment frames and supports, Sign poles and guardrails
Processed into products: Pipe fittings (elbows, tees, reducers), Flanges and coupling rings, Structural tubing and columns, Brackets and mounting plates, Scaffolding components, Roll-formed profiles and channels, Heat exchanger shells (low-pressure)
Application industries: Construction and infrastructure, Water and gas distribution, Agriculture and irrigation, Automotive and transportation, General fabrication and machinery
ASTM A283 Grade C ERW Pipe Similar / Alternative Material Recommendations
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| USA | ASTM A36/A36M | A36 | Higher strength (≥250 MPa yield, 400–550 MPa tensile); often used interchangeably for structural shapes; may require thicker sections for equivalent strength |
| USA | API 5L | Grade B | Pipe grade specification; similar strength and composition; used for line pipe; may have additional toughness requirements |
| USA | ASTM A283/A283M | Grade D | Higher strength grade within the same standard; ≥230 MPa yield, 415–550 MPa tensile; suitable for slightly heavier structural demands |
| European Union | EN 10025-2 | S275JR | Higher strength (≥275 MPa yield, 410–560 MPa tensile); suitable for more demanding structural applications |
| Japan | JIS G3131 | SPHC | Hot-rolled mild steel sheet/coil; yield ~205–220 MPa typical; used for general forming; not a direct replacement for all structural applications |
Notes:
Fabrication and Welding: A283 Grade C has excellent weldability; no preheating is required for sections up to 25 mm thickness. Filler metals such as AWS E6013 or E7018 are compatible.
ERW pipe specific tests: Finished ERW pipes may be subject to flattening tests, flare tests, hydrostatic pressure tests, and non-destructive inspection (e.g., eddy current) as per ASTM A53 or API 5L if required.
Corrosion protection: Because it is mild steel, external and internal protective coatings (galvanizing, painting, epoxy lining) are recommended for corrosive environments.
Limitations: Not intended for high-temperature or high-pressure service unless verified by supplementary specification. For pressure applications, consult standards such as ASME B31 or API 5L.
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