Comprehensive Analysis of DIN 17102 WStE315 Carbon and Low
Comprehensive Analysis of DIN 17102 WStE315 Carbon and Low-alloy High-strength Steel Plate
Detailed material properties, chemical composition, mechanical and thermal performance of WStE315 steel plate under DIN 17102, with international equivalent grades and application guidance.
Cutting, welding, bending, machining, drilling, grinding
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Comprehensive Analysis of DIN 17102 WStE315 Carbon and Low Introduction
WStE315 is a normalized fine grain structural steel defined in the now-withdrawn DIN 17102 standard. It is engineered for welded structures requiring both high strength and good notch toughness. The designation "W" indicates weldability, "St" stands for steel, "E" means normalized (normalgeglüht), and "315" denotes the minimum yield strength of 315 MPa for thicknesses up to 16 mm. This steel offers excellent cold formability and reliable impact resistance, making it suitable for heavy-duty machinery, bridge construction, and industrial frameworks. Although superseded by modern EN 10025-3 grades, it remains in service for legacy projects and provides a cost-effective solution for demanding structural applications.
Comprehensive Analysis of DIN 17102 WStE315 Carbon and Low Chemical composition
The chemical composition of WStE315 is tailored to achieve a fine grain structure and optimal weldability. Maximum impurity limits and minimum aluminium content ensure notch toughness. Microalloying elements such as niobium, vanadium, and titanium may be added to further refine grain size and enhance strength. The following table summarizes typical requirements according to DIN 17102.
| Chemical element | Standard value (wt%) | Remarks |
|---|---|---|
| C | ≤0.20 | For thickness ≤100 mm; may be relaxed for larger thicknesses |
| Si | ≤0.50 | Deoxidizer and strength contributor |
| Mn | 1.00–1.70 | Essential for strength and toughness |
| P | ≤0.030 | Impurity limit |
| S | ≤0.025 | Improves machinability but kept low for toughness |
| N | ≤0.015 | Nitrogen content controlled |
| Altotal | ≥0.020 | Fine grain practice, acid-soluble aluminium |
| Nb | ≤0.05 (optional) | Grain refiner, may be added |
| V | ≤0.10 (optional) | Optional microalloying for strengthening |
| Ti | ≤0.05 (optional) | Optional for grain refinement |
| Cu | ≤0.30 (residual) | |
| Cr | ≤0.30 (residual) | |
| Ni | ≤0.30 (residual) | |
| Mo | ≤0.08 (residual) | |
| Nb+V+Ti | ≤0.22 (if combined) | Sum of microalloying elements |
Comprehensive Analysis of DIN 17102 WStE315 Carbon and Low Thermal and electrical physical properties
Typical physical properties of WStE315 are consistent with carbon-manganese structural steels. Values may vary slightly with production route and temperature. The following data provides reference values at room temperature unless otherwise noted.
| Property | Standard required value | Unit | Test condition |
|---|---|---|---|
| Density (ρ) | 7.85 | g/cm³ | 20 °C |
| Elastic modulus (E) | 210 | GPa | 20 °C |
| Poisson's ratio (ν) | 0.3 | 20 °C | |
| Thermal expansion coeff. (α) | 12 | 10-6/K | 20–100 °C |
| Thermal conductivity (λ) | 50 | W/(m·K) | 20 °C |
| Specific heat capacity (c) | 460 | J/(kg·K) | 20 °C |
| Electrical resistivity (ρe) | 0.2 | 10-6 Ω·m | 20 °C |
Comprehensive Analysis of DIN 17102 WStE315 Carbon and Low Mechanical properties
Mechanical properties of WStE315 are thickness-dependent, with decreasing yield strength as product thickness increases. The steel offers good ductility (elongation ≥21%) and reliable impact resistance at low temperatures. Testing is typically performed on longitudinal specimens. The following table lists specified values from DIN 17102.
| Property | Standard required value | Unit | Test condition |
|---|---|---|---|
| Yield strength (ReH) | 315 (min) | MPa | t ≤16 mm |
| Yield strength (ReH) | 295 (min) | MPa | 16 < t ≤40 mm |
| Yield strength (ReH) | 285 (min) | MPa | 40 < t ≤63 mm |
| Yield strength (ReH) | 275 (min) | MPa | 63 < t ≤80 mm |
| Tensile strength (Rm) | 490–630 | MPa | t ≤16 mm |
| Tensile strength (Rm) | 470–610 | MPa | 16 < t ≤40 mm |
| Tensile strength (Rm) | 470–610 | MPa | 40 < t ≤63 mm |
| Tensile strength (Rm) | 470–610 | MPa | 63 < t ≤80 mm |
| Elongation (A5) | ≥22 | % | t ≤40 mm, longitudinal |
| Elongation (A5) | ≥21 | % | 40 < t ≤80 mm, longitudinal |
| Impact energy (KV, -20°C) | ≥27 (average) | J | Longitudinal, 3 specimens |
| Impact energy (KV, -20°C) | ≥20 (single) | J | Single minimum, longitudinal |
| Bending test (180°) | Mandrel dia. = 1.5×t | t ≤16 mm | |
| Bending test (180°) | Mandrel dia. = 2.0×t | 16 < t ≤40 mm | |
| Bending test (180°) | Mandrel dia. = 2.5×t | 40 < t ≤63 mm | |
| Bending test (180°) | Mandrel dia. = 3.0×t | 63 < t ≤80 mm |
Comprehensive Analysis of DIN 17102 WStE315 Carbon and Low Fully equivalent material standards and replaceable grades
| Country/Region | Standard | Grade | Remarks |
|---|
Comprehensive Analysis of DIN 17102 WStE315 Carbon and Low Application Introduction
WStE315 steel plates are primarily used in welded structures subject to static and dynamic loads. Their fine grain structure provides good resistance to brittle fracture, making them suitable for low-temperature service. Typical applications include bridge girders, crane booms, heavy vehicle chassis, and machinery frames.
Product Applications: Bridge girders and truss members, Crane booms and lattice towers, Chassis frames for heavy trucks, Excavator arms and bulldozer blades, Pressure vessel shells and headers
Processed into products: Welded H-beams and box columns, Base plates and joint plates, Flanges and stiffeners, Gusset plates and brackets, Shaft collars and hubs
Application industries: Construction and civil engineering, Heavy machinery and equipment, Shipbuilding and offshore, Transportation (rail, automotive), Power generation (turbines, pressure vessels)
Comprehensive Analysis of DIN 17102 WStE315 Carbon and Low Similar / alternative material recommendations
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| Europe | EN 10025-3 | S355N (1.0545) | Higher yield (355 MPa), similar toughness and weldability |
| USA | ASTM A572 | Grade 50 (345 MPa) | Higher yield, close composition but not identical |
| Japan | JIS G3106 | SM490A/B/C | 490 MPa tensile class, yield 325-365 MPa |
| China | GB/T 1591 | Q345C/D/E | Yield ≥345 MPa, comparable toughness |
Notes:
DIN 17102 has been withdrawn and replaced by the EN 10025 series. For new designs, grades such as S355N should be considered. When replacing WStE315 in existing structures, ensure that the substitute grade meets or exceeds the required mechanical properties, toughness, and weldability. It is advisable to consult the original design documentation and current standards for equivalent selection.
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