API 5L Grade E ERW Pipe Material
API 5L Grade E ERW Pipe: Chemical, Mechanical & Physical Properties
Comprehensive material data for API 5L Grade E electric-resistance-welded (ERW) steel pipe, including chemical composition, tensile properties, thermal and electrical characteristics, equivalent international standards, and practical applications in pipeline and structural systems.
Electric resistance welding (ERW), cold/hot forming, annealing (optional), galvanizing
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API 5L Grade E ERW Pipe Introduction
API 5L Grade E is a historic line-pipe grade that was widely used for electric resistance welded (ERW) pipe in low-pressure oil, gas, and water transmission. Although no longer explicitly listed in current API 5L editions, Grade E is effectively superseded by Grade A (PSL1), sharing the same minimum yield strength of 207 MPa (30 ksi) and minimum tensile strength of 331 MPa (48 ksi). The steel is semi-killed or killed, with controlled carbon and manganese to ensure good weldability and formability during the ERW process. Typical applications include low-strength pipelines, structural tubing, fencing, and general conveyance. The material is typically supplied in the as-welded condition and can be coated (galvanized, painted) for corrosion protection.
API 5L Grade E ERW Pipe Chemical Composition – Equivalent to API 5L Grade A PSL1
The chemical requirements are based on heat analysis (product analysis may have slightly wider tolerances). Grade E/ Grade A is a mild carbon steel with no intentional alloy additions. The sulfur and phosphorus levels are restricted to ensure good weldability and ductility. Residual elements such as copper, nickel, and chromium are permitted up to the indicated maxima but are not required to be reported.
| Element | Max. Value (%) | Remarks |
|---|---|---|
| C | 0.22 | Maximum |
| Mn | 0.90 | Maximum |
| P | 0.030 | Maximum |
| S | 0.030 | Maximum |
| Cu | 0.50 | Maximum, residual |
| Ni | 0.50 | Maximum, residual |
| Cr | 0.30 | Maximum, residual |
| Mo | 0.15 | Maximum, residual |
| V | 0.05 | Maximum, residual |
| Nb | 0.05 | Maximum, residual |
| Ti | 0.04 | Maximum, residual |
| N | 0.012 | Maximum (if reported) |
API 5L Grade E ERW Pipe Thermal and Electrical Physical Properties
Physical property values are typical for low‑carbon mild steel (0.2% C) at room temperature unless stated otherwise. These values are not part of the mandatory specification requirements but are useful for design calculations. Actual properties may vary slightly depending on exact composition and processing history.
| Property | Typical Value | Unit | Test Condition |
|---|---|---|---|
| Density (ρ) | 7.85 | g/cm³ | At 20°C |
| Elastic Modulus (E) | 200 | GPa | At 20°C, tension |
| Shear Modulus (G) | 80 | GPa | At 20°C |
| Poisson's Ratio (ν) | 0.30 | – | At 20°C |
| Thermal Expansion Coeff. (α) | 12.2 | 10⁻⁶/°C | 20–100°C range |
| Thermal Conductivity (λ) | 51 | W/(m·K) | At 20°C |
| Specific Heat Capacity | 486 | J/(kg·K) | At 20°C |
| Electrical Resistivity (ρ_e) | 0.17 | µΩ·m | At 20°C |
API 5L Grade E ERW Pipe Mechanical Properties
Tensile properties are determined on longitudinal strip specimens taken from the pipe body (base metal). Elongation requirements depend on wall thickness; the value given is the minimum for pipe with wall thickness ≤5 mm. The yield strength corresponds to the 0.5% total extension under load (Rt0.5) or the lower yield point. No Charpy V‑notch impact requirements apply to this grade unless specifically ordered for PSL2 or special service.
| Property | Minimum Value | Unit | Test Condition |
|---|---|---|---|
| Yield Strength (ReH / Rt0.5) | 207 | MPa | Longitudinal strip, room temperature |
| Yield Strength (ReH / Rt0.5) | 30 | ksi | Longitudinal strip, room temperature |
| Tensile Strength (Rm) | 331 | MPa | Longitudinal strip, room temperature |
| Tensile Strength (Rm) | 48 | ksi | Longitudinal strip, room temperature |
| Elongation (A) | 25 | % | Longitudinal, gauge length 50 mm (2 in), wall ≤5 mm |
| Elongation (A) | 22 | % | Longitudinal, gauge length 50 mm (2 in), wall 5‑7.3 mm |
| Elongation (A) | 20 | % | Longitudinal, gauge length 50 mm (2 in), wall >7.3 mm |
API 5L Grade E ERW Pipe Full Equivalent Material Standards and Replacement Grades
| Country / Region | Standard | Grade | Remarks |
|---|---|---|---|
| USA | ASTM A53 | Grade A | Identical yield/tensile; commonly used for welded pipe |
| International | ISO 3183 | PSL1 Grade A | Same strength level, same chemistry concept |
| Europe | EN 10217-1 | P235TR1 | Comparable minimum yield 235 MPa, similar application |
| Japan | JIS G3452 | SGP (White pipe) | Approximately 30‑40 ksi tensile, used for low‑pressure service |
API 5L Grade E ERW Pipe Application Introduction
API 5L Grade E (or its modern equivalent Grade A) is a versatile low‑carbon steel pipe intended for non‑critical structural and pressure applications where weldability and cost are prime considerations. The ERW manufacturing process allows for efficient production of long continuous lengths. Typical application industries and products include:
Product Applications: Line pipe for sweet service (oil, gas, water), Structural tubing for frameworks, Mechanical tubing for machinery frames, Casing and tubing for shallow wells, Fence posts and handrails
Processed into products: Pipe spools and fittings (elbows, tees, reducers, flanges), Scaffold couplers and tie‑rods, Support brackets and hangers, Gate and fence hardware, Clamps, clips, and light‑duty fasteners
Application industries: Oil & Gas (low‑pressure flowlines, gathering lines), Water treatment and distribution, Municipal and civil engineering (sewage, drainage), Construction (scaffolding, piling, bracing), Agriculture (irrigation, livestock watering systems), Fencing and railing, Conduit for electrical cables
API 5L Grade E ERW Pipe Similar / Alternative Materials for Comparison
| Country / Region | Standard | Grade | Remarks |
|---|---|---|---|
| USA | API 5L | Grade B | Higher strength: yield 241 MPa min, tensile 414 MPa min |
| USA | ASTM A53 | Grade B | Yield 240 MPa, tensile 414 MPa, commonly used |
| Europe | EN 10224 | L235 (S235JRH) | Similar yield ~235 MPa, for aqueous liquids |
| China | GB/T 3091 | Q235B | Comparable low‑carbon welded pipe for general pressure service |
| India | IS 1239 | Part‑1 Light grade | Used for water, air, and gas; tensile ~320‑460 MPa |
Notes:
Obsolete grade: API 5L Grade E is no longer actively listed in current editions. It is fully interchangeable with API 5L Grade A for all practical purposes. All chemical and mechanical requirements presented here are drawn from the active specification API 5L 46th edition (Grade A PSL1). Users evaluating older pipelines should confirm that the actual material properties align with these values. For safety‑critical or high‑pressure applications, consider upgrading to Grade B or higher strength levels.
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