DIN 17102 TStE315 Hot Rolled Steel Coil
DIN 17102 TStE315 Hot Rolled Steel Coil - Weldable Fine Grain Structural Steel
Comprehensive material data for DIN 17102 TStE315 hot rolled steel coil: chemical composition, mechanical properties, thermal and electrical physical values, international equivalents, and application guidelines.
Cold forming, bending, welding, cutting, machining
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DIN 17102 TStE315 Hot Rolled Steel Coil Introduction
DIN 17102 TStE315 is a hot rolled weldable fine grain structural steel with a minimum yield strength of 315 MPa. It is designed for cold forming and welding in structural and engineering applications. The material is supplied in the normalized rolled condition, offering a balanced combination of strength, toughness, and excellent weldability. Typical uses include heavy-duty frames, automotive components, and crane booms. The fine grain structure ensures good resistance to brittle fracture even at low temperatures, with guaranteed impact energy values.
DIN 17102 TStE315 Hot Rolled Steel Coil Chemical composition
The chemical composition according to DIN 17102 ensures fine grain practice through microalloying elements (Nb, V, Ti) in combination with controlled rolling. Maximum limits for residuals guarantee good weldability and mechanical properties.
- Carbon equivalent values (CEV) are typically controlled to facilitate welding.
- Aluminium is added as a grain refiner and deoxidizer.
| Element | Standard value (max / range) | Remarks |
|---|---|---|
| C | ≤ 0.16 | |
| Si | ≤ 0.50 | |
| Mn | 0.90 – 1.60 | |
| P | ≤ 0.035 | |
| S | ≤ 0.030 | |
| Al total | ≥ 0.020 | Fine grain practice |
| Nb | ≤ 0.05 | As grain refiner |
| V | ≤ 0.10 | As grain refiner / precipitation hardening |
| Ti | ≤ 0.05 | As grain refiner |
| N | ≤ 0.020 | |
| Cr | ≤ 0.30 | Residual element |
| Ni | ≤ 0.30 | Residual element |
| Cu | ≤ 0.35 | Residual element |
| Mo | ≤ 0.10 | Residual element |
| Nb+V+Ti | ≤ 0.22 | Sum of microalloying elements |
DIN 17102 TStE315 Hot Rolled Steel Coil Thermal and electrical physical properties
The following physical properties are typical for this class of fine grain structural steel at room temperature unless otherwise noted. They are provided as design guidance. Thermal conductivity and specific heat capacity are important for welding preheat calculations.
- Density is essentially constant for all low-alloy steels.
- Elastic constants are valid for small deformations at room temperature.
| Property | Standard value | Unit | Test condition |
|---|---|---|---|
| Density ρ | 7.85 | g/cm³ | 20 °C |
| Young's modulus E | 210 | GPa | 20 °C |
| Shear modulus G | 81 | GPa | 20 °C |
| Poisson's ratio ν | 0.3 | — | 20 °C |
| Thermal expansion coefficient α | 11.1 | 10⁻⁶/K | 20 – 100 °C |
| Thermal expansion coefficient α | 12.5 | 10⁻⁶/K | 20 – 200 °C |
| Thermal expansion coefficient α | 13.0 | 10⁻⁶/K | 20 – 300 °C |
| Thermal conductivity λ | 51 | W/(m·K) | 20 °C |
| Thermal conductivity λ | 49 | W/(m·K) | 100 °C |
| Specific heat capacity cp | 461 | J/(kg·K) | 20 °C |
| Specific heat capacity cp | 486 | J/(kg·K) | 200 °C |
| Electrical resistivity ρe | 0.22 | μΩ·m | 20 °C |
DIN 17102 TStE315 Hot Rolled Steel Coil Mechanical properties
Minimum yield strength and tensile properties are guaranteed for the as-delivered condition. The values depend on product thickness. The steel exhibits good notch toughness at low temperature with minimum Charpy V-notch impact energy of 27 J at -20 °C.
- Bend test: 180° bending over a mandrel diameter of 2a (a = specimen thickness) for thickness ≤ 16 mm.
- Elongation is measured on a proportional gauge length L0 = 5.65√S0.
| Property | Standard required value | Unit | Test condition / thickness |
|---|---|---|---|
| Yield strength ReH (min) | 315 | MPa | t ≤ 16 mm |
| Yield strength ReH (min) | 305 | MPa | 16 < t ≤ 40 mm |
| Yield strength ReH (min) | 295 | MPa | 40 < t ≤ 63 mm |
| Tensile strength Rm | 440 – 560 | MPa | t ≤ 16 mm |
| Tensile strength Rm | 420 – 540 | MPa | 16 < t ≤ 40 mm |
| Tensile strength Rm | 400 – 540 | MPa | 40 < t ≤ 63 mm |
| Elongation A (min) | 20 | % | L0 = 5.65√S0, t ≤ 40 mm |
| Elongation A (min) | 19 | % | L0 = 5.65√S0, 40 < t ≤ 63 mm |
| Bend test (mandrel diameter) | 2a | — | 180°, t ≤ 16 mm |
| Bend test (mandrel diameter) | 3a | — | 180°, 16 < t ≤ 25 mm |
| Impact energy KV2 (min, longitudinal) | 27 | J | -20 °C, all thicknesses |
DIN 17102 TStE315 Hot Rolled Steel Coil Complete equivalent material standards and replaceable grades
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| Europe | EN 10149-2 | S315MC | Direct successor; identical requirements for thermomechanically rolled products. |
| International | ISO 6930-1 | S315MC | Harmonized with European standard. |
| Germany (superseded) | DIN 17102:1980 | TStE315 | Original designation; now replaced by EN 10149-2. |
DIN 17102 TStE315 Hot Rolled Steel Coil Application Introduction
DIN 17102 TStE315 is selected when a combination of easy forming, reliable weldability, and good low-temperature toughness is required. Its fine grain structure makes it suitable for dynamically loaded and safety-relevant components.
- Cold forming operations such as bending, drawing, and roll forming can be performed without cracking.
- Welding by all common methods (MAG, SAW, MMA) with appropriate low-hydrogen consumables and preheat control.
Product Applications: Chassis frames, side members, cross members, Boom sections and telescopic crane arms, Welded structural hollow sections, Base frames for industrial plants, Flanges and stiffeners in pressure vessels, Vibratory screening machines
Processed into products: Longitudinal beams for truck trailers, Brackets and support arms, Dumper bodies and excavator buckets, Welded pipe sections for conveyor systems, Wind turbine tower internal platforms (non-weathering)
Application industries: Automotive and commercial vehicle manufacturing, Construction and earthmoving machinery, Crane and lifting equipment, Agricultural machinery, Welded tubular structures (e.g., scaffolding, pipes), General mechanical engineering
DIN 17102 TStE315 Hot Rolled Steel Coil Similar / alternative material grades with comparable properties
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| Europe | EN 10025-3 | S355N / S355NL | Higher yield strength (355 MPa), normalized fine grain steel; suitable for heavier sections and lower temperature toughness. |
| China | GB/T 1591 | Q345B | Widely used structural steel; minimum yield 345 MPa; not identical but often used for similar applications with adjustments. |
| USA | ASTM A1011 / A1011M | HSLAS Grade 50 Class 1 | High-strength low-alloy steel with min. yield 345 MPa; chemical composition and delivery condition differ. |
| Japan | JIS G 3135 | SPFC 590Y | Cold-rolled high-strength sheet; yield ~315 MPa range, but for thin gauge automotive applications. |
Notes:
- The figures presented are based on the superseded DIN 17102 standard; for new designs the current EN 10149-2 S315MC is recommended.
- When processing this steel, bend radii should be selected according to the recommended minimum values (2a for thickness ≤ 16 mm).
- A low CEV (typically <0.35) facilitates good weldability without excessive preheating. Actual CEV can be calculated from the mill test certificate.
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