DIN 17102 EStE420 High-Strength Weldable Normalized Fine-Grain Structural Steel
DIN 17102 EStE420 High-Strength Weldable Normalized Fine-Grain Structural Steel
Detailed material data for DIN 17102 EStE420, a weldable normalized fine-grain structural steel with improved cold-forming properties and minimum 420 MPa yield strength.
Welding, cold bending, hot forming, machining, cutting
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DIN 17102 EStE420 High-Strength Weldable Normalized Fine-Grain Structural Steel Introduction
DIN 17102 EStE420 is a weldable normalized fine-grain structural steel with enhanced cold-forming characteristics. It belongs to the family of high-strength low-alloy (HSLA) steels and offers a minimum yield strength of 420 MPa. The 'E' prefix denotes stricter control of impurities (phosphorus, sulfur) and guaranteed impact toughness, making it suitable for demanding structural applications at low service temperatures. It is typically delivered in the normalized condition and is widely used in heavy machinery, crane construction, and off-shore structures. Due to its balanced chemical composition and fine grain size, EStE420 combines good weldability with high strength and ductility.
DIN 17102 EStE420 High-Strength Weldable Normalized Fine-Grain Structural Steel Chemical Composition
The ladle analysis according to DIN 17102 for grade EStE420. The steel is fine-grain treated using aluminum and may contain microalloying elements (Nb, V, Ti) to achieve the required strength. Compared to plain StE420, the maximum phosphorus and sulfur contents are lower to improve ductility and cold-forming properties.
| Chemical Element | Nominal Value (wt%) | Remarks |
|---|---|---|
| Carbon (C) | ≤ 0.20 | |
| Silicon (Si) | ≤ 0.50 | |
| Manganese (Mn) | 1.00 – 1.70 | |
| Phosphorus (P) | ≤ 0.025 | Stricter limit than StE420 |
| Sulfur (S) | ≤ 0.020 | Stricter limit for cold-formability |
| Aluminium (Al) total | ≥ 0.020 | Grain refinement |
| Nitrogen (N) | ≤ 0.012 | |
| Niobium (Nb) | ≤ 0.05* | Optional microalloy |
| Vanadium (V) | ≤ 0.10* | Optional microalloy |
| Titanium (Ti) | ≤ 0.05* | Optional microalloy |
| Carbon Equivalent (CEV) | ≤ 0.45 (typical) | Based on product thickness |
DIN 17102 EStE420 High-Strength Weldable Normalized Fine-Grain Structural Steel Physical Properties
Typical physical properties for normalized fine-grain structural steels like EStE420. These values are not part of DIN 17102 and are provided for design guidance. Properties vary slightly with chemical composition and temperature.
| Property | Typical Value | Unit | Test Condition |
|---|---|---|---|
| Density (ρ) | 7.85 | g/cm³ | at 20 °C |
| Elastic Modulus (E) | 210 | GPa | at 20 °C |
| Shear Modulus (G) | 81 | GPa | at 20 °C |
| Poisson's Ratio (ν) | 0.3 | – | at 20 °C |
| Thermal Expansion (α) | 12.0 | 10⁻⁶/K | 20 °C – 100 °C |
| Thermal Expansion (α) | 12.5 | 10⁻⁶/K | 20 °C – 200 °C |
| Thermal Expansion (α) | 13.0 | 10⁻⁶/K | 20 °C – 300 °C |
| Thermal Conductivity (λ) | 50 | W/(m·K) | at 20 °C |
| Thermal Conductivity (λ) | 47 | W/(m·K) | at 200 °C |
| Specific Heat Capacity | 460 | J/(kg·K) | at 20 °C |
| Electrical Resistivity (ρ_e) | 0.23 | µΩ·m | at 20 °C |
DIN 17102 EStE420 High-Strength Weldable Normalized Fine-Grain Structural Steel Mechanical Properties
Mechanical properties for normalized plate in different thickness ranges as specified in DIN 17102 for EStE420. The impact test temperature depends on the ordered quality (e.g. J2 = -20 °C). Values are for longitudinal test pieces unless stated otherwise. Bending tests are performed with mandrel diameters relative to specimen thickness.
| Property | Requirement | Unit | Test Condition / Thickness |
|---|---|---|---|
| Yield Strength (ReH) | ≥ 420 | MPa | t ≤ 16 mm |
| Yield Strength (ReH) | ≥ 400 | MPa | 16 mm < t ≤ 40 mm |
| Yield Strength (ReH) | ≥ 380 | MPa | 40 mm < t ≤ 63 mm |
| Yield Strength (ReH) | ≥ 370 | MPa | 63 mm < t ≤ 80 mm |
| Yield Strength (ReH) | ≥ 360 | MPa | 80 mm < t ≤ 100 mm |
| Tensile Strength (Rm) | 520 – 680 | MPa | t ≤ 100 mm |
| Elongation (A5) | ≥ 20 | % | t ≤ 40 mm, gauge length 5.65√So |
| Elongation (A5) | ≥ 19 | % | 40 mm < t ≤ 63 mm |
| Elongation (A5) | ≥ 18 | % | 63 mm < t ≤ 100 mm |
| Bend Test | D = 3t (180°) | t ≤ 63 mm; transverse specimens | |
| Bend Test | D = 4t (180°) | t > 63 mm; transverse specimens | |
| Impact Energy (KV2) | ≥ 27 J (long.) | J | at -20 °C (quality J2, if ordered) |
| Impact Energy (KV2) | ≥ 27 J (long.) | J | at 0 °C (quality J0, if ordered) |
DIN 17102 EStE420 High-Strength Weldable Normalized Fine-Grain Structural Steel Direct/equivalent Material Standards and Substitute Grades
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| Europe | EN 10025-3 | S420N | Normalized fine-grain structural steel, same strength class, impact toughness class N (optional L for low temperature) |
| Europe | EN 10025-3 | S420NL | Normalized fine-grain steel with guaranteed impact at -50°C, suitable for lower temperatures |
| Germany (old) | DIN EN 10025-3 | S420N | Direct replacement for EStE420 in modern standards |
DIN 17102 EStE420 High-Strength Weldable Normalized Fine-Grain Structural Steel Application Introduction
EStE420 plates are designed for welded structures that require high strength combined with good formability at room and low temperatures. The improved purity and fine grain ensure reliable cold bending and resistance to brittle fracture. The steel can be used in aggressive service environments when protected, and its weldability reduces fabrication costs.
Product Applications: Welded crane booms and jibs, Excavator arms, buckets, and dozer blades, Long-span truss bridges, Offshore module substructures, Rolled and welded structural beams, Cold-formed profiles for vehicle chassis
Processed into products: Load-bearing welds and gusset plates, Flanges and webs of plated girders, Chassis side rails and cross members, Circular and rectangular hollow sections (when available), Bending-critical structural elements, Transition pieces and node castings
Application industries: Crane and heavy lifting equipment, Earthmoving and mining machinery, Bridge construction and civil engineering, Offshore platforms and ship structures, Pressure vessel and storage tank fabrication, Transportation and vehicle frame manufacturing
DIN 17102 EStE420 High-Strength Weldable Normalized Fine-Grain Structural Steel Similar/Comparable Material Recommendations
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| Europe | EN 10025-4 | S420M | Thermomechanical rolled instead of normalized; similar strength, different production route |
| Europe | EN 10025-3 | S460N | Higher yield strength (460 MPa) normalized fine-grain steel, slightly different weldability |
| USA | ASTM A572 | Grade 60 [415] | High-strength low-alloy as-rolled steel; not normalized, impact toughness not guaranteed unless specified |
| USA | ASTM A516 | Grade 65 | Normalized carbon steel for pressure vessels; lower yield (~240 MPa) but good toughness |
| Japan | JIS G3106 | SM520C | Weldable structural steel with ≥365 MPa yield, not fully equivalent in strength or normalizing treatment |
Notes:
EStE420 replaces the older StE420 by imposing stricter limits on phosphorus and sulfur and guaranteeing cold-forming characteristics. When ordering, the toughness class (e.g., J0, J2) must be specified to ensure appropriate impact energy levels at low temperatures. The steel is suitable for hot-dip galvanizing and can be painted under standard surface preparation. Welding consumables should be selected to match the base metal strength and toughness. For heavy sections, preheating and interpass temperature control may be required to avoid hydrogen cracking.
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