DIN 17102 WStE315 Weldable Fine
DIN 17102 WStE315: Normalized Fine-Grain High-Strength Structural Steel Coil
Complete material data for WStE315 steel coil under DIN 17102, including chemical composition, mechanical properties, physical properties, equivalent grades, and application guide.
Welding, cold forming, hot forming, normalizing, cutting, machining
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DIN 17102 WStE315 Weldable Fine Introduction
WStE315 is a normalized fine-grain structural steel defined in the now-withdrawn German standard DIN 17102. It offers a minimum yield strength of 315 MPa and is designed for welded, dynamically loaded structures at low ambient temperatures. The steel features excellent weldability, good toughness, and uniform through-thickness properties due to its fine-grain microstructure achieved by normalizing. Typical applications include:
- Heavy steel construction
- Bridge building
- Offshore and marine engineering
- Pressure vessels and storage tanks
The steel is supplied in coil form for further processing, usually in the normalized or normalized-rolled condition.
DIN 17102 WStE315 Weldable Fine Chemical Composition
The chemical composition of WStE315 per DIN 17102 is designed to ensure fine-grain structure and good weldability. Carbon equivalent (CEV) is controlled to guarantee toughness and avoid cold cracking. The steel is fully killed and fine-grain treated with aluminum, often supplemented by microalloying elements such as niobium, vanadium, or titanium. Maximum limits for phosphorus and sulfur are set low to improve ductility and cleanliness.
| Element | Standard Value (max, unless range given) | Remarks |
|---|---|---|
| C | ≤ 0.20 | |
| Si | ≤ 0.50 | |
| Mn | 1.00 – 1.60 | |
| P | ≤ 0.030 | |
| S | ≤ 0.025 | |
| Al (total) | ≥ 0.020 | Fine-grain practice |
| Nb | ≤ 0.05 | Optional microalloy |
| V | ≤ 0.10 | Optional microalloy |
| Ti | ≤ 0.03 | Optional microalloy |
| N | ≤ 0.020 | |
| CEV | ≤ 0.45 | For thickness ≤ 40 mm; CEV = C + Mn/6 + (Cr+Mo+V)/5 + (Ni+Cu)/15 |
DIN 17102 WStE315 Weldable Fine Thermal and Electrical Physical Properties
The physical properties of WStE315 are representative of low-carbon fine-grain structural steels. These data are based on published literature for similar steel grades and are suitable for engineering calculations such as thermal stress analysis and electrical resistance estimation. Values are provided at room temperature unless otherwise stated; temperature-dependent properties are given for a common service range.
| Property | Typical Value | Unit | Test Condition |
|---|---|---|---|
| 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 | 0.30 | – | 20 °C |
| Thermal expansion coefficient α | 11.5 | 10⁻⁶/K | 20 – 100 °C |
| Thermal expansion coefficient α | 12.1 | 10⁻⁶/K | 20 – 200 °C |
| Thermal expansion coefficient α | 12.9 | 10⁻⁶/K | 20 – 300 °C |
| Thermal conductivity λ | 42 | W/(m·K) | 20 °C |
| Thermal conductivity λ | 39 | W/(m·K) | 100 °C |
| Specific heat capacity cp | 460 | J/(kg·K) | 20 °C |
| Electrical resistivity ρe | 0.23 | Ω·mm²/m | 20 °C |
DIN 17102 WStE315 Weldable Fine Mechanical Properties
Mechanical properties of WStE315 are guaranteed in the normalized condition. The yield strength varies with product thickness, while tensile strength and elongation are specified up to 100 mm thickness. Charpy V-notch impact energy is tested at -20°C, with a minimum average of 27 J for standard grades. These values ensure reliable performance in low-temperature structural applications.
| Property | Standard Requirement | Unit | Test Condition / Thickness (mm) |
|---|---|---|---|
| Yield strength ReH | ≥ 315 | MPa | t ≤ 16 |
| Yield strength ReH | ≥ 305 | MPa | 16 < t ≤ 35 |
| Yield strength ReH | ≥ 285 | MPa | 35 < t ≤ 50 |
| Yield strength ReH | ≥ 265 | MPa | 50 < t ≤ 100 |
| Tensile strength Rm | 440 – 560 | MPa | t ≤ 100 |
| Elongation A (L=5.65√So) | ≥ 22 | % | t ≤ 25, longitudinal |
| Elongation A (L=5.65√So) | ≥ 20 | % | t ≤ 25, transverse |
| Elongation A (L=5.65√So) | ≥ 22 | % | 25 < t ≤ 50, longitudinal |
| Elongation A (L=5.65√So) | ≥ 20 | % | 25 < t ≤ 50, transverse |
| Charpy impact energy KV | ≥ 27 (average) | J | Test temperature -20 °C, longitudinal, 10x10 mm specimen |
| Charpy impact energy KV | ≥ 20 (single value) | J | Test temperature -20 °C, longitudinal |
DIN 17102 WStE315 Weldable Fine Directly Equivalent Standards and Substitutable Grades
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| Germany | DIN 17102 (withdrawn) | WStE315 | Original specification |
| European Union | EN 10025-3 | S315N | Modern equivalent, normalized fine-grain steel, with impact test at -20°C |
| International | ISO 630-3 | E315 | Structural steel – Part 3: Fine-grain normalized steels |
DIN 17102 WStE315 Weldable Fine Application Introduction
WStE315 steel coil is ideal for demanding structural applications where high strength, good weldability, and reliable low-temperature toughness are required. The normalized delivery condition guarantees uniform mechanical properties, making the material suitable for critical welded fabrications. Typical processing includes cutting, cold forming, welding, and machining. It is not recommended for high-temperature (>400°C) service without evaluation of mechanical property changes.
Product Applications: Steel bridge girders and box sections, Offshore platform decks and legs, Storage tanks and silos, Wind turbine towers, Crane booms and mobile crane frames, Heavy-duty vehicle chassis, Welded beams and columns for high-rise buildings
Processed into products: Web and flange plates for welded beams, Penstock and spiral casing components, Boiler and pressure vessel shell plates, Drilling rig mast sections, Excavator arms and booms, Railway wagon frames, Structural nodes and gusset plates
Application industries: Civil engineering and infrastructure, Offshore oil & gas platforms, Shipbuilding and marine structures, Mechanical engineering and heavy machinery, Transport and lifting equipment, Energy and pressure vessel fabrication
DIN 17102 WStE315 Weldable Fine Similar / Close-Match Alternative Materials
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| USA | ASTM A572/A572M | Grade 50 [345 MPa] | Higher yield strength, but similar weldable structural applications; may require additional toughness verification. |
| Japan | JIS G3106 | SM490B | Comparable tensile range and toughness at 0°C; widely used for welded structures. |
| China | GB/T 1591 | Q345B | Slightly higher yield strength; similar chemistry and usage; check impact test temperature. |
| Russia | GOST 19281 | 17G1S | Low-alloy structural steel with comparable strength and weldability. |
| European Union | EN 10025-3 | S355N | Higher strength variant (355 MPa); fully compatible as an upgrade in most designs. |
Notes:
Additional information:
- DIN 17102 was withdrawn and replaced by EN 10025-3; however, WStE315 coils may still be available from distributors with certification to the former standard.
- Formability is good for a high-strength steel; minimum bending radius approximately 2.5t (transverse bending) for thicknesses up to 20 mm.
- Preheating for welding is generally not required for thicknesses below 40 mm at ambient temperatures above +5°C, but consult welding guidelines (e.g., EN 1011).
- Post-weld heat treatment (stress relieving) can be performed at 530–580°C.
- CEV limit ensures excellent hot and cold forming properties.
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