StE315 (DIN 17102) Carbon and Low-alloy High-strength Steel Coil
StE315 (DIN 17102) Carbon and Low-alloy High-strength Steel Coil - Normalized Fine Grain Structural Steel
Detailed material data for StE315 steel coil under DIN 17102, including chemical composition, mechanical properties, physical properties, international equivalents, and applications.
Normalizing, hot forming, cold forming, welding, machining
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StE315 Carbon and Low-alloy High-strength Steel Coil Introduction
StE315 is a normalized fine grain structural steel specified in the German standard DIN 17102. It is a carbon and low-alloy high-strength steel with a minimum yield strength of 315 MPa in thicknesses up to 16 mm. The steel exhibits good weldability, excellent toughness, and through-thickness properties, making it suitable for welded structures where high load-bearing capacity is required. Its fine grain structure, achieved through controlled rolling or normalizing, enhances strength and impact resistance at low temperatures.
- Key attributes: high strength, good formability, reliable notch toughness.
- Available as coils, plates, and sections.
- Commonly used in bridges, crane construction, pressure vessels, and heavy machinery.
StE315 Carbon and Low-alloy High-strength Steel Coil Chemical Composition
The chemical composition for StE315 according to DIN 17102. The fine grain structure is typically achieved through the addition of aluminum, and optionally niobium, vanadium, or titanium. Maximum limits are indicated unless a range is specified.
- All values are in weight percent.
- Additional microalloying elements may be present as per agreement.
| Chemical Element | Standard Value | Remarks |
|---|---|---|
| Carbon (C) | ≤ 0.20 | Ladle analysis |
| Silicon (Si) | ≤ 0.50 | |
| Manganese (Mn) | 0.90 – 1.60 | |
| Phosphorus (P) | ≤ 0.035 | |
| Sulfur (S) | ≤ 0.030 | |
| Nitrogen (N) | ≤ 0.015 | For fine grain treatment; if Al or Ti added, nitrogen may be bound |
| Aluminum (Altotal) | ≥ 0.020 | Minimum for grain refinement; acid-soluble Al |
| Niobium (Nb) | ≤ 0.05 | Optional microalloying element |
| Vanadium (V) | ≤ 0.12 | Optional |
| Titanium (Ti) | ≤ 0.05 | Optional |
StE315 Carbon and Low-alloy High-strength Steel Coil Thermal and Electrical Physical Properties
The following physical properties are typical for normalized fine grain structural steel StE315. These values are informative and may vary slightly with heat treatment and composition. Thermal conductivity and expansion are important for welding and design.
| Property | Typical Value | Unit | Test Condition / Remarks |
|---|---|---|---|
| Density (ρ) | 7.85 | g/cm³ | Room temperature |
| Elastic Modulus (E) | 210 | GPa | Room temperature, static |
| Shear Modulus (G) | ≈ 81 | GPa | Calculated from E and Poisson ratio |
| Poisson's Ratio (ν) | 0.3 | — | Room temperature |
| Thermal Expansion Coefficient (α) | 12 × 10⁻⁶ | 1/K | 20–100 °C average |
| Thermal Conductivity (λ) | ≈ 50 | W/(m·K) | At 20 °C |
| Specific Heat Capacity (cp) | ≈ 460 | J/(kg·K) | At 20 °C |
| Electrical Resistivity (ρe) | 0.15 – 0.25 | µΩ·m | At 20 °C, depends on alloy content |
StE315 Carbon and Low-alloy High-strength Steel Coil Mechanical Properties
Mechanical properties of StE315 according to DIN 17102. The values depend on the product thickness. Yield strength decreases as thickness increases. Impact energy is guaranteed at -20°C for longitudinal specimens of standard Charpy-V tests. All tests are performed at room temperature unless otherwise noted.
| Property | Standard Requirement Value | Unit | Test Condition / Thickness Range |
|---|---|---|---|
| Yield Strength (ReH) | ≥ 315 | MPa | t ≤ 16 mm |
| Yield Strength (ReH) | ≥ 295 | MPa | 16 mm < t ≤ 40 mm |
| Yield Strength (ReH) | ≥ 275 | MPa | 40 mm < t ≤ 63 mm |
| Yield Strength (ReH) | ≥ 255 | MPa | 63 mm < t ≤ 80 mm |
| Yield Strength (ReH) | ≥ 235 | MPa | 80 mm < t ≤ 100 mm |
| Tensile Strength (Rm) | 490 – 630 | MPa | t ≤ 100 mm |
| Elongation (A5) | ≥ 22 | % | t ≤ 40 mm, longitudinal |
| Elongation (A5) | ≥ 21 | % | 40 mm < t ≤ 63 mm, longitudinal |
| Elongation (A5) | ≥ 20 | % | 63 mm < t ≤ 100 mm, longitudinal |
| Impact Energy (KV, longitudinal) | ≥ 31 | J | at -20 °C, Charpy-V, t ≤ 100 mm |
| Bend Test (180° bend) | No cracks | Mandrel diameter = 2a (a=thickness) for Rm 490-630 MPa; for t≤16 mm 1a allowed if agreed |
StE315 Carbon and Low-alloy High-strength Steel Coil Complete Equivalent Material Standards and Replaceable Grades
| Country / Region | Standard | Grade | Remarks |
|---|---|---|---|
| Europe | EN 10025-3 | S315N | Direct equivalent; normalized fine grain structural steel |
| Germany (W-Nr.) | — | 1.0486 | Material number for StE315 |
| Italy | UNI 7382 | FeE 315 | Equivalent grade |
| France | NF A 35-501 | E 315 D | Approximate; check mechanical ranges |
StE315 Carbon and Low-alloy High-strength Steel Coil Application Introduction
StE315 is widely employed in welded structural engineering due to its excellent strength-to-weight ratio, good weldability, and low-temperature toughness. It is suitable for static and dynamic loads. The steel can be cold formed with adequate bend radii and is readily processed by all welding methods. Typical applications include:
Product Applications: Welded bridge girders and box sections, Crane booms and lifting equipment, Pressure vessels for moderate temperatures, Offshore platform substructures, Storage tanks for liquids and bulk solids, Structural frameworks for industrial buildings
Processed into products: Flanges and webs of welded beams, End plates and stiffeners, Node connections in tubular structures, Base plates for columns, Gusset plates and brackets, Reinforcement pads for pressure vessels
Application industries: Construction and civil engineering (bridges, stadiums, high-rise structures), Heavy machinery and crane manufacturing, Pressure vessel and storage tank fabrication, Offshore and shipbuilding, Transportation (railway vehicles, truck frames)
StE315 Carbon and Low-alloy High-strength Steel Coil Similar / Alternative Materials with Comparable Properties
| Country / Region | Standard | Grade | Remarks |
|---|---|---|---|
| Europe | EN 10025-3 | S355N | Higher yield strength class (355 MPa), similar toughness; often interchangeable with design adjustment |
| Europe | EN 10025-4 | S355M | Thermomechanically rolled fine grain steel, higher strength and thinner sections possible |
| Germany | DIN 17102 | StE355 | Previous German grade with 355 MPa min yield, otherwise very similar |
| USA | ASTM A572 | Grade 50 | Yield 345 MPa, structural quality, not fully equivalent but common alternative for non-sour service |
| China | GB/T 1591 | Q345D | Yield 345 MPa, normalized option, low-temp impact; widely used structural steel |
Notes:
Welding: StE315 can be welded by all standard methods (SMAW, GMAW, SAW). Preheating is generally not necessary for thicknesses below 30 mm, but a qualified welding procedure should be followed. For thicker sections, low hydrogen practice is recommended.
Cold forming: Minimum bending radii should be observed (2t for transverse bending, 2.5t for longitudinal) to avoid cracking.
Delivery conditions: The material is supplied in the normalized condition unless otherwise agreed. Certificates to EN 10204 type 3.1 are common.
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