DIN 17102 TStE380
DIN 17102 TStE380 Automobile Structure Steel Plate – High-Strength Thermomechanical Rolled Steel
Comprehensive material properties of TStE380 steel according to DIN 17102, covering chemical composition, mechanical and physical properties, international equivalents, and typical applications in automobile structural components.
Cold forming, hot forming, cutting, welding, drilling, machining
- Phone : +8618037372205
- Email : [email protected]
- WhatsApp: Contact via Whtsapp
- WeChat: +8618037372205
DIN 17102 TStE380 Introduction
TStE380 is a weldable fine-grain structural steel produced by thermomechanical rolling, specified in the German standard DIN 17102. It offers a minimum yield strength of 380 MPa and excellent toughness, combined with good cold formability and weldability. The steel is designed for demanding welded structures in the automotive sector, such as chassis, frames, and crane components, where weight savings and high load-bearing capacity are critical. Its fine-grain microstructure provides superior resistance to brittle fracture even at low temperatures, while the thermomechanical process helps reduce carbon equivalent, minimizing preheating requirements during welding. Delivery conditions typically include normalized or thermomechanical rolled state, with optional impact testing at specified temperatures to suit different service conditions.
DIN 17102 TStE380 Chemical Composition
Typical chemical composition of TStE380 according to DIN 17102. The steel is microalloyed with niobium, vanadium, and/or titanium to achieve grain refinement and precipitation hardening. Low carbon content ensures good weldability. Aluminum is added for deoxidation and nitrogen fixation.
| Element | Standard Value (wt%) | Remarks |
|---|---|---|
| Carbon (C) | ≤0.12 | Max |
| Silicon (Si) | ≤0.50 | Max |
| Manganese (Mn) | ≤1.60 | Max |
| Phosphorus (P) | ≤0.030 | Max |
| Sulfur (S) | ≤0.025 | Max |
| Aluminum (Al) | ≥0.015 | Minimum total Al |
| Niobium (Nb) | ≤0.05 | Max |
| Vanadium (V) | ≤0.10 | Max |
| Titanium (Ti) | ≤0.05 | Max |
| Nitrogen (N) | ≤0.020 | Max |
| Chromium (Cr) | ≤0.30 | Residual max |
| Copper (Cu) | ≤0.30 | Residual max |
| Molybdenum (Mo) | ≤0.10 | Residual max |
| Nickel (Ni) | ≤0.30 | Residual max |
DIN 17102 TStE380 Physical, Thermal and Electrical Properties
Typical physical properties of TStE380 at room temperature, unless otherwise specified. These values are common for low-alloy structural steels and are suitable for engineering calculations related to thermal expansion, heat transfer, and electrical resistance.
| Property | Value | Unit | Test Condition |
|---|---|---|---|
| Density (ρ) | 7850 | kg/m³ | at 20°C |
| Modulus of elasticity (E) | 210 | GPa | at 20°C |
| Shear modulus (G) | 81 | GPa | at 20°C |
| Poisson's ratio (ν) | 0.30 | – | at 20°C |
| Thermal expansion coefficient (α) | 12.0 × 10⁻⁶ | K⁻¹ | 20°C – 100°C |
| Thermal expansion coefficient (α) | 12.5 × 10⁻⁶ | K⁻¹ | 20°C – 200°C |
| Thermal expansion coefficient (α) | 13.0 × 10⁻⁶ | K⁻¹ | 20°C – 300°C |
| Thermal conductivity (λ) | 50 | W/(m·K) | at 20°C |
| Specific heat capacity (cp) | 460 | J/(kg·K) | at 20°C |
| Electrical resistivity (ρe) | 0.22 | μΩ·m | at 20°C |
DIN 17102 TStE380 Mechanical Properties
Mechanical properties of TStE380 depend on the nominal thickness. Minimum yield strength values decrease slightly with increasing thickness. The steel exhibits good ductility and can be formed to tight radii. Impact toughness is verified by Charpy V-notch tests at specified temperatures depending on the ordered grade suffix (e.g., B for -20°C, C for -30°C, N for -20°C, V for -30°C). For general delivery without suffix, impact test at 0°C with minimum 27 J is typical.
| Property | Value | Unit | Condition / Thickness |
|---|---|---|---|
| Upper yield strength (ReH) | ≥380 | MPa | t ≤ 16 mm |
| Upper yield strength (ReH) | ≥370 | MPa | 16 mm < t ≤ 40 mm |
| Upper yield strength (ReH) | ≥360 | MPa | 40 mm < t ≤ 63 mm |
| Tensile strength (Rm) | 510 – 680 | MPa | t ≤ 40 mm |
| Tensile strength (Rm) | 490 – 660 | MPa | 40 mm < t ≤ 80 mm |
| Tensile strength (Rm) | 470 – 630 | MPa | 80 mm < t ≤ 100 mm |
| Elongation after fracture (A) | ≥19 | % | t ≤ 40 mm (L0 = 5.65√S0) |
| Elongation after fracture (A) | ≥18 | % | 40 mm < t ≤ 63 mm |
| Elongation after fracture (A) | ≥17 | % | 63 mm < t ≤ 100 mm |
| Bend test (mandrel diameter) | 0.5 a | – | t ≤ 16 mm (a=thickness, 180° bend) |
| Bend test (mandrel diameter) | 1.0 a | – | 16 mm < t ≤ 40 mm |
| Bend test (mandrel diameter) | 1.5 a | – | 40 mm < t ≤ 63 mm |
| Impact energy (Charpy V) – Grade without suffix | ≥27 | J | at 0°C, longitudinal |
| Impact energy (Charpy V) – Grade B | ≥27 | J | at -20°C, longitudinal |
| Impact energy (Charpy V) – Grade N | ≥27 | J | at -20°C, longitudinal |
| Impact energy (Charpy V) – Grade V | ≥27 | J | at -30°C, longitudinal |
DIN 17102 TStE380 Completely Equivalent Material Standards and Substitutable Grades
| Country / Region | Standard | Grade | Remarks |
|---|---|---|---|
| Europe | EN 10025-4:2004 | S380M (1.8823) | Direct equivalent to TStE380; also available as S380ML with improved low-temperature toughness |
| International | ISO 4950-2:1995 | E380 TM | Thermomechanical rolled high yield strength steel |
| Germany | DIN 17102:1980 | TStE380 | Original standard – base grade, also with suffixes B, N, V for different impact classes |
DIN 17102 TStE380 Application Introduction
TStE380 is a versatile high-strength steel for welded load-bearing structures. It is particularly suited for dynamic loads and low-temperature service when ordered with appropriate impact designations. The thermomechanical rolling process enables thinner cross-sections compared to conventional structural steels, leading to lighter constructions and fuel savings in mobile applications. Typical processing includes plasma/oxyfuel cutting, cold forming, and welding with standard procedures (MAG/MIG, manual arc, submerged arc). Preheating is generally not required for thicknesses below 30 mm when using low-hydrogen consumables.
Product Applications: Truck frames and chassis beams, Trailer undercarriages, Mobile crane booms and outriggers, Excavator arms and buckets, Railway wagon bodies, Heavy-duty fork-lift masts
Processed into products: Longitudinal and cross members of vehicle chassis, Welded box sections for booms, Pressed reinforcements and brackets, Torque tubes and axle housings, Welded structural nodes in bridges, Base plates and gussets in heavy machinery
Application industries: Automotive heavy vehicle manufacturing, Crane and lifting equipment, Earthmoving and mining machinery, Bridge and structural engineering, Agricultural equipment, Transport and logistics vehicles
DIN 17102 TStE380 Similar / Approximately Substitutable Materials
| Country / Region | Standard | Grade | Remarks |
|---|---|---|---|
| Europe | EN 10025-4 | S355M (1.8823) | Minimum yield 355 MPa, one strength class lower, often used where lower weight savings are acceptable |
| China | GB/T 1591-2018 | Q420D | Minimum yield 420 MPa, higher strength, may require slightly higher preheat for welding |
| USA | ASTM A572/A572M | Grade 60 [415] | Yield strength 415 MPa, chemically similar but not identical; check toughness requirements |
| Japan | JIS G 3106 | SM490B | Yield strength around 325-365 MPa depending on thickness, common weldable structural steel |
Notes:
Note: Actual mechanical properties may vary depending on the product thickness and manufacturer's specific processing. For critical applications, consult the latest edition of EN 10025-4 or the original DIN 17102 document. When substituting with equivalent grades, verify that the impact test temperature and notched bar impact energy requirements match the design service conditions. In welded structures, follow recognized welding guidelines such as EN 1011-2 to ensure proper heat input and consumable selection. Surface condition is typically as-rolled, but pickled and oiled or blast-cleaned finishes can be supplied upon request.
- Share
