DIN17102 WStE380
DIN 17102 WStE380: Weldable Fine-Grain Structural Steel Plate with 380 MPa Yield Strength
Comprehensive data sheet for DIN 17102 WStE380 carbon and low-alloy high-strength steel plate, including chemical composition, mechanical properties, physical properties, international equivalents, and application guide.
Hot rolling followed by normalizing heat treatment; suitable for welding, bending, cold forming, cutting, and machining.
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DIN17102 WStE380 Introduction
WStE380 is a normalized, weldable fine-grain structural steel specified in DIN 17102. With a minimum yield strength of 380 MPa for thicknesses up to 16 mm, it offers a balanced combination of strength, toughness, and excellent weldability. It is intended for welded constructions subject to dynamic loads and low-temperature service. The steel is fully killed and fine-grain treated (with Al, Nb, V or Ti) to ensure good toughness. Typical applications include
- bridges
- crane structures
- pressure vessels
- offshore platforms
- vehicle frames
The material is delivered in the normalized condition (N) or, upon agreement, in thermomechanically rolled condition (M).
DIN17102 WStE380 Chemical Composition
The following table lists the ladle analysis limits for WStE380 according to DIN 17102. The steel is fully killed and fine-grain treated; fine grain elements (Al, Nb, V, Ti) are present. Values are maximum unless a range is given.
| Chemical Element | Standard Value | Remarks |
|---|---|---|
| Carbon (C) | ≤0.20% | For t≤16 mm; may be ≤0.22% for larger thickness |
| Silicon (Si) | ≤0.55% | |
| Manganese (Mn) | 1.00 - 1.65% | |
| Phosphorus (P) | ≤0.030% | Ladle analysis; up to 0.035% for product analysis |
| Sulfur (S) | ≤0.025% | Ladle analysis; up to 0.030% for product analysis |
| Nitrogen (N) | ≤0.015% | If sufficient amounts of nitride formers are present |
| Aluminium (Altotal) | ≥0.020% | As grain refiner |
| Niobium (Nb) | ≤0.05% | Optional, alone or in combination |
| Vanadium (V) | ≤0.12% | Optional |
| Titanium (Ti) | ≤0.05% | Optional |
| Niobium+Vanadium+Titanium | ≤0.22% | Sum of microalloy elements when added |
DIN17102 WStE380 Thermal and Electrical Physical Properties
The physical properties listed are typical values for normalized fine-grain structural steels like WStE380 at room temperature, unless otherwise indicated. They are suitable for engineering calculations but are not mandatory specification requirements.
| Property Item | Standard Required Value | Unit | Test Condition |
|---|---|---|---|
| Density (ρ) | 7.85 | g/cm³ | At 20°C |
| Modulus of Elasticity (E) | 210 | GPa | At 20°C |
| Shear Modulus (G) | 81 | GPa | At 20°C (calculated from E and ν) |
| Poisson's Ratio (ν) | 0.3 | - | At 20°C |
| Thermal Expansion Coefficient (α) | 12.0 | 10⁻⁶/K | 20°C to 100°C |
| Thermal Expansion Coefficient (α) | 12.5 | 10⁻⁶/K | 20°C to 200°C |
| Thermal Expansion Coefficient (α) | 13.0 | 10⁻⁶/K | 20°C to 300°C |
| Thermal Conductivity (λ) | 50 | W/(m·K) | At 20°C |
| Thermal Conductivity (λ) | 48 | W/(m·K) | At 100°C |
| Thermal Conductivity (λ) | 45 | W/(m·K) | At 200°C |
| Specific Heat Capacity (c) | 460 | J/(kg·K) | At 20°C |
| Specific Heat Capacity (c) | 490 | J/(kg·K) | At 100°C |
| Specific Heat Capacity (c) | 530 | J/(kg·K) | At 200°C |
| Electrical Resistivity (ρe) | 0.18 | µΩ·m | At 20°C, approximate |
DIN17102 WStE380 Mechanical Properties
The mechanical properties of WStE380 are valid for the normalized delivery condition (+N) at room temperature, unless otherwise specified. The values depend on product thickness. Longitudinal test pieces are used unless transverse properties are agreed.
| Property Item | Standard Required Value | Unit | Test Condition |
|---|---|---|---|
| Yield Strength (ReH) | ≥380 | MPa | Thickness ≤16 mm |
| Yield Strength (ReH) | ≥360 | MPa | Thickness 16 < t ≤ 35 mm |
| Yield Strength (ReH) | ≥330 | MPa | Thickness 35 < t ≤ 50 mm |
| Yield Strength (ReH) | ≥300 | MPa | Thickness 50 < t ≤ 80 mm |
| Tensile Strength (Rm) | 530 - 710 | MPa | Thickness ≤16 mm |
| Tensile Strength (Rm) | 520 - 700 | MPa | Thickness 16 < t ≤ 35 mm |
| Tensile Strength (Rm) | 510 - 690 | MPa | Thickness 35 < t ≤ 50 mm |
| Tensile Strength (Rm) | 490 - 670 | MPa | Thickness 50 < t ≤ 80 mm |
| Elongation (A) | ≥20 | % | Longitudinal, thickness ≤16 mm, L0=5.65√S0 |
| Elongation (A) | ≥19 | % | Longitudinal, thickness 16 < t ≤ 35 mm, L0=5.65√S0 |
| Elongation (A) | ≥18 | % | Longitudinal, thickness 35 < t ≤ 50 mm, L0=5.65√S0 |
| Elongation (A) | ≥17 | % | Longitudinal, thickness 50 < t ≤ 80 mm, L0=5.65√S0 |
| Impact Energy (KV2) | ≥40 | J | At -20°C, longitudinal (grade N) |
| Impact Energy (KV2) | ≥27 | J | At -50°C, longitudinal (grade NL, upon agreement) |
| Bend Test (mandrel diameter) | No crack | - | 180° bend, d=3a for t≤16 mm, d=4a for t>16 mm |
DIN17102 WStE380 Completely Equivalent Material Standards and Alternative Grades
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| European Union | EN 10025-3:2004 | S355N | Normalizing rolled fine-grain steel, minimum yield 355 MPa at t≤16mm, chemical and mechanical equivalence with WStE380 |
| European Union | EN 10025-3:2004 | S355NL | Similar to S355N but with guaranteed impact energy at -50°C |
| International | ISO 630-3:2012 | S355N | Technical delivery conditions for fine-grain structural steels |
| Japan | JIS G 3106 | SM490A | Welded structural steel, yield strength 365-490 MPa, comparable toughness |
| USA | ASTM A572/A572M | Grade 50 [345] | High-strength low-alloy structural steel, minimum yield 345 MPa; slightly lower yield than WStE380 but widely used as substitute |
DIN17102 WStE380 Application Introduction
Due to its excellent weldability, guaranteed through-thickness toughness, and homogeneous normalized microstructure, WStE380 is ideally suited for static and dynamic loaded welded structures operating at low ambient temperatures. The fine-grain treatment ensures resistance to brittle fracture. Typical uses include:
Product Applications: Welded bridge girders and arches, Crane booms and chassis, Tower sections for wind turbines, Ship hulls and deck structures, Pressure vessels and storage tanks, Offshore structural components (jackets, decks), Heavy-duty vehicle frames (trucks, trailers), Mining shovel buckets and booms
Processed into products: Flanges and webs of welded I-beams, Gusset plates and stiffeners, Tubular hollow sections for towers and masts, Box girder sections for heavy cranes, Foundation components for offshore wind turbines, Stiffened panels for shipbuilding, Cut and welded parts of mechanical structures, Load-bearing members in high-rise steel frames
Application industries: Civil engineering and construction, Heavy machinery and crane manufacturing, Shipbuilding and marine structures, Offshore platforms and wind turbine towers, Pressure vessel and tank construction, Railway vehicles and transport equipment, Mining equipment, Bridge building
DIN17102 WStE380 Similar or Closely Comparable Materials
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| European Union | EN 10025-2 | S355J2 | Hot-rolled structural steel, not fine-grain treated, but similar strength level; impact energy at -20°C |
| European Union | EN 10025-3 | S355N NX | Enhanced toughness (NL quality), fully equivalent in terms of strength and fine-grain practice |
| Germany | DIN 17102 | TStE380 | High-temperature fine-grain structural steel, similar strength but different temperature application |
| Germany | DIN 17102 | EStE380 | Toughness guaranteed fine-grain steel for special applications, similar base composition |
| United Kingdom | BS 4360 | 50D | Historical equivalent: weldable structural steel with minimum yield 355 MPa, good low-temperature impact properties |
| China | GB/T 1591 | Q355D | High-strength low-alloy structural steel with fine-grain treatment and impact energy at -20°C |
Notes:
WStE380 has been superseded by EN 10025-3 for new designs, but the designation is still used in maintenance and existing projects. When ordering, the required delivery condition (+N or +M), impact temperature grade (-20°C or -50°C), and product analysis tolerances should be specified. Preheating for welding is generally not required for plate thicknesses below 30 mm, provided low-hydrogen processes are used. Post-weld heat treatment (stress relieving) may be applied at 530-600°C. The CEV (carbon equivalent) is typically below 0.45%, ensuring good weldability without cracking risk.
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