TStE355 Fine Grain Structural Steel Coil
TStE355 DIN 17102 Hot Rolled Steel Coil: Properties, Equivalents & Applications
Detailed analysis of TStE355 steel according to DIN 17102, including chemical composition, mechanical and thermal properties, international equivalents, and application guidance for structural engineering.
Welding, machining, cold and hot forming, normalizing, stress-relief annealing
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TStE355 Fine Grain Structural Steel Coil Introduction
TStE355 is a hot-rolled, weldable fine-grain structural steel originally specified under the withdrawn German standard DIN 17102:1980. It is designed for demanding welded constructions, where high toughness and strength are required. The grade guarantees a minimum yield strength of 355 MPa for thicknesses up to 16 mm, coupled with excellent notch impact energy at low temperatures (typically -20°C). Its fine-grain structure is achieved by controlled rolling and/or normalizing, ensuring uniform mechanical properties and good formability. Today the standard is superseded by EN 10025-3 (grade S355N/NL), but TStE355 remains widely recognized in existing structures and international referencing.
TStE355 Fine Grain Structural Steel Coil Chemical Composition
Heat analysis according to DIN 17102:1980. Fine-grain elements (Nb, V, Ti) are added singly or in combination to ensure a fine-grain microstructure. Aluminium is present as a grain refiner. The low carbon content and controlled micro-alloying guarantee good weldability and high toughness at low temperatures.
| Element | Typical/Max. value | Remarks |
|---|---|---|
| C | ≤0.18 | Ladle analysis |
| Si | ≤0.50 | |
| Mn | 1.00 – 1.60 | |
| P | ≤0.030 | |
| S | ≤0.025 | |
| Al (total) | ≥0.02 | Grain refining |
| Nb | ≤0.05 | Micro-alloying |
| V | ≤0.12 | Micro-alloying |
| Ti | ≤0.06 | Micro-alloying |
| N | ≤0.015 | |
| Nb+V+Ti | ≤0.15 | Combined limit |
TStE355 Fine Grain Structural Steel Coil Thermal and Electrical Physical Properties
Typical physical properties at room temperature for low-alloy structural steel. These values are not part of DIN 17102 but are representative for this type of fine-grain steel and are suitable for engineering calculations.
| Property | Typical value | Unit | Test condition |
|---|---|---|---|
| Density (ρ) | 7850 | kg/m³ | 20 °C |
| Modulus of elasticity (E) | 210 | GPa | 20 °C |
| Shear modulus (G) | 81 | GPa | 20 °C |
| Poisson's ratio (ν) | 0.3 | — | 20 °C |
| Thermal expansion coefficient (α) | 12.0 × 10⁻⁶ | K⁻¹ | 20 – 100 °C |
| Thermal expansion coefficient (α) | 13.5 × 10⁻⁶ | K⁻¹ | 20 – 300 °C |
| Thermal conductivity (λ) | 50 | W/(m·K) | 20 °C |
| Specific heat capacity (c) | 480 | J/(kg·K) | 20 °C |
| Electrical resistivity (ρₑ) | 0.16 | µΩ·m | 20 °C |
TStE355 Fine Grain Structural Steel Coil Mechanical Properties
Properties in the normalized (+N) condition as per DIN 17102. Values for flat products in transverse direction unless otherwise stated. Impact energy is verified at -20°C. Bend test with mandrel diameter valid for longitudinal specimens.
| Property | Required value | Unit | Test condition |
|---|---|---|---|
| Yield strength ReH | ≥355 | MPa | t ≤ 16 mm |
| Yield strength ReH | ≥345 | MPa | 16 < t ≤ 40 mm |
| Yield strength ReH | ≥335 | MPa | 40 < t ≤ 63 mm |
| Yield strength ReH | ≥325 | 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 | 450 – 590 | MPa | 40 < t ≤ 63 mm |
| Tensile strength Rm | 440 – 580 | MPa | 63 < t ≤ 80 mm |
| Elongation A (L0=5.65√S0) | ≥22 | % | t ≤ 16 mm, longitudinal |
| Elongation A | ≥22 | % | 16 < t ≤ 40 mm, longitudinal |
| Elongation A | ≥21 | % | 40 < t ≤ 63 mm, longitudinal |
| Elongation A | ≥20 | % | 63 < t ≤ 80 mm, longitudinal |
| Bend test – mandrel diam. | 2a | — | Longitudinal, bend angle 180° |
| Charpy impact KV (-20°C) | ≥27 | J | Longitudinal, V-notch |
TStE355 Fine Grain Structural Steel Coil Fully Equivalent Standards and Replaceable Grades
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| Europe | EN 10025-3:2004 | S355N | Direct successor; normalized delivery |
| Europe | EN 10025-3:2004 | S355NL | For low-temperature impact ≥ -50°C |
| United Kingdom | BS 4360:1990 | 50EE | EE = elongation and elevated temperature properties; withdrawn |
| France | NF A36-205 | E355 | Equivalent fine-grain steel; withdrawn |
| Italy | UNI EN 10025-3 | S355N | Adopts European standard |
| Germany | DIN 17102:1980 | TStE355 | Original designation (withdrawn) |
TStE355 Fine Grain Structural Steel Coil Application Introduction
TStE355 is widely used in welded steel structures that require high strength combined with excellent toughness, especially under dynamic loading. Its fine-grain structure permits safe use at temperatures down to -20°C. Typical processing includes thermal cutting, welding, cold and hot forming, shot blasting and painting. The steel delivers consistent through-thickness properties and is suitable for hollow sections, heavy plates, and built-up beams.
Product Applications: Bridge girders, box sections and arches, Offshore platform decks and substructures, Crane booms, crawler chassis, and structural booms, Wind turbine towers and transition pieces, Steel framework for high-rise buildings, Hull reinforcements and deckhouses, Excavator arms, dump truck frames, Penstocks, storage tanks, and pressure containers
Processed into products: Welded beams, columns, and trusses, Flanges, stiffeners, and end plates, Bracket supports and mounting plates, Lifting lugs and padeyes, Cut and machined heavy-plate parts, Cold-formed profiles and hollow sections, Cast steel nodes (if comparable cast grade used), Crane rail brackets and slewing rings
Application industries: Bridge construction, Offshore and marine engineering, Crane and heavy machinery manufacturing, Power generation (wind towers, boiler structures), Civil engineering (high-rise buildings, stadiums), Shipbuilding (hull and deck components), Mining and earth-moving equipment, Pressure vessels and penstocks
TStE355 Fine Grain Structural Steel Coil Similar or Nearby Substitute Materials
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| USA | ASTM A572/A572M | Grade 50 [345] | Minimum yield 50 ksi (345 MPa); similar strength but not identical fine-grain specification |
| USA | ASTM A588/A588M | Grade 50 | Atmospheric corrosion-resistant; comparable strength |
| Japan | JIS G3106 | SM490A/B/C | 490 MPa tensile class; SM490B/C offer good low-temperature toughness |
| Japan | JIS G3135 | SPFC390 | Cold formable high-strength steel; strength range overlaps |
| China | GB/T 1591-2018 | Q355ND | Modern Chinese fine-grain structural steel with comparable properties |
| International | ISO 4950-2 | E355 | High yield strength flat steel products; discontinued |
Notes:
Weldability: Excellent when proper pre-heat and heat input controls are applied; carbon equivalent (CEV) typically below 0.45.
Z-quality: Through-thickness property requirements (e.g. Z35) can be ordered separately if required by design codes.
Corrosion protection: Requires coating unless designed with corrosion allowance. Hot-dip galvanizing is possible after suitable pre-treatment.
Supply forms: Mostly delivered as hot-rolled plate or coil; other dimensions upon agreement.
Inspection: Certificates to EN 10204 3.1 can be supplied with full mechanical and chemical traceability.
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