EN 10297EN 10297-1 E315 Seamless Steel Tube
EN 10297-1 E315 Seamless Steel Tube for Automotive and Structural Applications
Comprehensive material data and equivalent grades for EN 10297-1 E315 seamless circular steel tube, ideal for mechanical and general engineering.
Hot-finished (seamless) or cold-finished; typically supplied in normalized (+N) or stress-relieved (+SR) condition; can also be delivered in cold-drawn/hard (+C) state for higher strength.
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EN 10297EN 10297-1 E315 Seamless Steel Tube Introduction
EN 10297-1 E315 is a non-alloy carbon-manganese steel specifically designed for seamless circular tubes used in mechanical and general engineering. It is characterized by a minimum yield strength of 315 MPa in the normalized delivery condition, offering a balanced combination of strength, ductility, and weldability. The material is produced according to the European standard EN 10297-1, which specifies technical delivery conditions for hot-finished or cold-finished seamless steel tubes.
- Minimum yield strength ≥315 MPa for wall thickness ≤16 mm
- Tensile strength typically between 490 and 630 MPa
- Good impact toughness down to -20°C upon agreement
- Excellent suitability for cold forming, machining, and welding
- Widely employed in automotive chassis, structural frameworks, and hydraulic cylinder bodies
EN 10297EN 10297-1 E315 Seamless Steel Tube Chemical Composition
The following chemical composition applies to ladle analysis according to EN 10297-1. The steel is fully killed and contains fine grain forming elements. Maximum limits ensure good weldability and consistent mechanical properties.
- Carbon is controlled to maintain strength while preserving ductility.
- Manganese acts as a primary strengthening element.
- Low phosphorus and sulfur contents guarantee high cleanliness and resistance to hot shortness.
| Element | Specified Value (max %) | Notes |
|---|---|---|
| Carbon (C) | 0.22 | Ladle analysis |
| Silicon (Si) | 0.55 | Ladle analysis |
| Manganese (Mn) | 1.60 | Ladle analysis |
| Phosphorus (P) | 0.025 | Ladle analysis |
| Sulfur (S) | 0.030 | Ladle analysis |
| Aluminium (Altotal) | ≥0.020 min | If specified for grain refinement |
| Niobium (Nb) | 0.05 | Optional microalloying element, if agreed |
EN 10297EN 10297-1 E315 Seamless Steel Tube Physical Properties
Physical properties are not specified in EN 10297-1. The data below represent typical values for carbon-manganese steel and are provided for design calculations. Actual values may vary slightly depending on exact composition and heat treatment.
- Thermal expansion and conductivity data are essential for welded structures subjected to temperature cycles.
- Electrical resistivity helps evaluate heating in electromagnetic applications.
| Property | Typical Value | Unit | Condition / Temperature |
|---|---|---|---|
| Density (ρ) | 7.85 | g/cm³ | 20°C |
| Modulus of elasticity (E) | 210 | GPa | 20°C |
| Shear modulus (G) | 81 | GPa | 20°C |
| Poisson's ratio (ν) | 0.3 | - | 20°C |
| Thermal expansion coefficient (α) | 12.0 | x10⁻⁶/K | 20–100°C |
| Thermal expansion coefficient (α) | 13.0 | x10⁻⁶/K | 20–200°C |
| Thermal expansion coefficient (α) | 14.0 | x10⁻⁶/K | 20–300°C |
| Thermal conductivity (λ) | 50 | W/(m·K) | 20°C |
| Specific heat capacity (cₚ) | 460 | J/(kg·K) | 20°C |
| Electrical resistivity (ρ_e) | 0.23 | Ω·mm²/m | 20°C |
EN 10297EN 10297-1 E315 Seamless Steel Tube Mechanical Properties
Mechanical properties are determined on test pieces taken from seamless tubes in the delivery condition +N (normalized). Values apply to wall thicknesses ≤16 mm unless otherwise stated.
- The yield strength indicates the beginning of plastic deformation.
- Elongation requirements ensure sufficient ductility for forming operations.
- Impact energy tests can be performed at specified temperatures upon agreement; the values below represent the minimum guaranteed at room temperature.
| Property | Requirement | Unit | Test Condition |
|---|---|---|---|
| Yield strength (ReH) | ≥315 | MPa | t ≤ 16 mm, transverse |
| Yield strength (ReH) | ≥275 | MPa | 16 < t ≤ 40 mm, transverse |
| Tensile strength (Rm) | 490 to 630 | MPa | t ≤ 40 mm, transverse |
| Elongation (A, longitudinal) | ≥20 | % | Gauge length 5.65√S₀, t ≤ 40 mm |
| Elongation (A, transverse) | ≥18 | % | Gauge length 5.65√S₀, t ≤ 40 mm |
| Impact energy (KV₂, longitudinal) | ≥27 | J | at +20°C, if agreed |
| Impact energy (KV₂, longitudinal) | ≥27 | J | at 0°C, if agreed |
| Impact energy (KV₂, longitudinal) | ≥27 | J | at -20°C (optional, by agreement) |
EN 10297EN 10297-1 E315 Seamless Steel Tube Equivalent Material Standards and Substitute Grades
As EN 10297-1 E315 is a harmonized European grade, there is no foreign national standard that is completely identical. However, several grades from former national standards share similar chemical requirements and application areas. The table below identifies the EN 10297-1 designation and comparable historical grades.
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| Europe | EN 10297-1 | E315 | Steel number 1.0580, unified European grade |
| Germany | DIN 17172 (withdrawn) | StE 315.7 | Former pipeline tube grade; similar strength, different standard |
| France | NF A49-311 (withdrawn) | TU E315 | Former French non-alloy structural tube |
| Italy | UNI 663 (withdrawn) | Fe 510 (1.0580) | Similar composition, replaces historic Fe 510 tubes |
EN 10297EN 10297-1 E315 Seamless Steel Tube Application Introduction
EN 10297-1 E315 seamless tubes are chosen for components that require a reliable combination of weldability, machinability, and moderate strength. The material is suitable for both dynamic and static loading conditions. Typical applications include:
Product Applications: Cold-drawn precision tubes for hydraulic and pneumatic cylinders, Hot-finished seamless tubes for structural supports and frameworks, Drive shafts and propeller shafts for passenger cars and commercial vehicles, Roll over protection structures (ROPS) and impact bars, Boiler and heat exchanger components (subject to additional requirements)
Processed into products: Automotive wishbones, tie rods, and stabilizer bars, Hydraulic cylinder barrels, piston rods, and gland nuts, Shafts for conveyors and rollers, Telescopic crane extension tubes, Scaffold couplers and steel tubular supports, Impact-absorbing crash boxes and bumper beams
Application industries: Automotive and transportation (chassis, steering, powertrain), Construction and civil engineering (structural frameworks, scaffolding), Mechanical engineering (machine parts, hollow bars), Fluid power (hydraulic cylinders, piston rods), General manufacturing (handling equipment, conveyor rolls)
EN 10297EN 10297-1 E315 Seamless Steel Tube Similar/Alternative Material Grades for General Comparison
The following materials are not exact equivalents but offer comparable yield strength and are widely used in similar applications. The user must verify technical suitability according to the specific design code before substitution.
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| Europe | EN 10210-1 | S355J2H | Structural hollow section, higher yield (355 MPa), impact tested at -20°C |
| Europe | EN 10216-1 | P275NL1 | Pressure vessel tube, lower C, impact tested at -20°C, slightly higher tensile |
| USA | ASTM A519 | Grade 1026 | Seamless mechanical tubing, yield ~345 MPa, higher carbon content |
| International | ISO 9329-2 | PH 29 | Pressure purpose non-alloy tube, yield ≥290 MPa, tensile 440-590 MPa |
Notes:
- The material is fully killed and fine grain treated. It can be welded by all usual methods. No post-weld heat treatment is normally required for sections up to 16 mm, but thicker sections may benefit from stress relieving.
- Surface condition and dimensional tolerances shall be in accordance with EN 10297-1. Non-destructive testing (e.g., ultrasonic inspection) can be specified on the order.
- For dynamic loading applications, especially at low temperatures, supplementary impact requirements should be agreed upon at the time of enquiry.
- This data is intended for informational purposes only. The definitive requirements are those of the current edition of EN 10297-1.
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