DIN 17100 St37-2 ERW Pipe
DIN 17100 St37-2 ERW Pipe: Structural Steel Properties, Equivalents & Applications
Detailed metallurgical data for St37-2 ERW pipe conforming to DIN 17100: chemical composition, mechanical and physical properties, international equivalents, similar materials, and application guidance.
Welding, cutting, bending, drilling, cold forming, machining, galvanizing
- Phone : +8618037372205
- Email : [email protected]
- WhatsApp: Contact via Whtsapp
- WeChat: +8618037372205
DIN 17100 St37-2 ERW Pipe Introduction
DIN 17100 St37-2 is a widely used general structural steel for welded, bolted, and riveted structures. When manufactured as electric resistance welded (ERW) pipe, it offers good weldability, formability, and adequate strength for many industrial and construction applications. Typical tensile strength ranges from 360 to 510 MPa, with minimum yield strength of 235 MPa for thicknesses up to 16 mm. The steel is typically supplied in the as-rolled condition and is suitable for cold forming and hot-dip galvanizing. It has been superseded by EN 10025-2 S235JR but remains in common use under legacy specifications.
DIN 17100 St37-2 ERW Pipe Chemical Composition
Chemical limits for St37-2 according to DIN 17100, based on ladle analysis. The grade is typically rimmed (R) or unkilled (U). Manganese content may be adjusted for thickness and deoxidation method. Nitrogen is restricted to avoid strain aging.
| Element | Standard Value (wt%) | Remarks |
|---|---|---|
| Carbon (C) | ≤0.17 | |
| Manganese (Mn) | ≤1.40 | Typical; may be lower for thin gauges |
| Phosphorus (P) | ≤0.045 | |
| Sulphur (S) | ≤0.045 | |
| Nitrogen (N) | ≤0.009 | For steel with aluminium addition |
DIN 17100 St37-2 ERW Pipe Thermal and Electrical Physical Properties
Physical properties for carbon structural steel at room temperature unless otherwise noted. These values are representative of St37-2 type material and may vary slightly with exact composition and microstructure.
| Property | Typical Value | Unit | Test Condition |
|---|---|---|---|
| Density (ρ) | 7.85 | g/cm³ | 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 |
| Coefficient of Thermal Expansion (α) | 12.0 | 10⁻⁶/K | 20 °C to 100 °C |
| Coefficient of Thermal Expansion (α) | 12.5 | 10⁻⁶/K | 20 °C to 200 °C |
| Coefficient of Thermal Expansion (α) | 13.0 | 10⁻⁶/K | 20 °C to 300 °C |
| Thermal Conductivity (λ) | 54 | W/(m·K) | 20 °C |
| Specific Heat Capacity (c) | ≈460 | J/(kg·K) | 20 °C |
| Electrical Resistivity (ρe) | 0.15 – 0.20 | µΩ·m | 20 °C |
DIN 17100 St37-2 ERW Pipe Mechanical Properties
Mechanical properties for St37-2 as specified in DIN 17100. For ERW pipe, these values are valid for the base metal; the weld seam shall also meet the same requirements per applicable product standards (e.g., EN 10217-1). Bend test and elongation values are for longitudinal specimens.
| Property | Standard Required Value | Unit | Test Condition |
|---|---|---|---|
| Yield Strength (ReH) | ≥235 | MPa | Thickness ≤16 mm |
| Yield Strength (ReH) | ≥225 | MPa | Thickness >16 mm to ≤40 mm |
| Yield Strength (ReH) | ≥215 | MPa | Thickness >40 mm to ≤63 mm |
| Tensile Strength (Rm) | 360 – 510 | MPa | All thicknesses |
| Elongation (A) | ≥26 | % | Thickness ≤16 mm; L₀=5.65√S₀ (longitudinal) |
| Elongation (A) | ≥25 | % | Thickness >16 mm to ≤40 mm; L₀=5.65√S₀ (longitudinal) |
| Elongation (A) | ≥24 | % | Thickness >40 mm to ≤63 mm; L₀=5.65√S₀ (longitudinal) |
| Bend Test | 180°, d=0.5a | — | Thickness ≤16 mm, longitudinal |
| Bend Test | 180°, d=1.0a | — | Thickness >16 mm, longitudinal |
DIN 17100 St37-2 ERW Pipe Direct Equivalent Material Standards and Replaceable Grades
| Country / Region | Standard | Grade | Remarks |
|---|---|---|---|
| Germany / EU | EN 10025-2 | S235JR | Direct replacement for St37-2; identical mechanical requirements and improved weldability |
| Japan | JIS G3101 | SS400 | Closest Japanese grade; slightly higher yield (≥245 MPa) and tensile range 400–510 MPa |
| USA | ASTM A36 / A36M | A36 | Close equivalent; yield ≥250 MPa, tensile 400–550 MPa; widely used structural steel |
| China | GB/T 700 | Q235B | Chinese equivalent; yield ≥235 MPa, tensile 370–500 MPa; similar carbon content |
| Russia | GOST 380 | St3sp | Russian structural steel; slight differences in P and S limits |
DIN 17100 St37-2 ERW Pipe Application Introduction
St37-2 ERW pipe is a versatile structural product suitable for a wide range of mechanical and civil engineering applications. Its combination of moderate strength, excellent weldability, and cost-effectiveness makes it a preferred choice for general fabrication, fluid transport, and structural assemblies. The material can be easily cut, bent, drilled, and coated to meet specific design requirements.
Product Applications: ERW steel pipes for low-pressure fluid transport (water, gas, steam), Structural hollow sections (square, rectangular, circular) for building frames, Scaffolding tubes and couplers, Furniture tubing (chairs, tables, shelves), Automotive parts (exhaust pipes, roll bars, chassis components), Tubular poles and sign supports, Greenhouse structures, Conveyor rollers and material handling equipment
Processed into products: Pipe spools and flanged connections, Handrail and guardrail systems, Structural columns and bracing members, Welded frames for machinery, Roof trusses and purlins (when galvanized), Fencing posts and gates, Bicycle and motorcycle frames, Exercise equipment frames
Application industries: Construction and infrastructure, Automotive and transportation, Agricultural machinery, Furniture manufacturing, Water and gas distribution, Mechanical engineering
DIN 17100 St37-2 ERW Pipe Similar or Comparable Substitute Materials
| Country / Region | Standard | Grade | Remarks |
|---|---|---|---|
| Germany / EU | EN 10025-2 | S235J0 / S235J2 | Higher notch toughness; J0 (0 °C), J2 (-20 °C); otherwise same strength |
| India | IS 2062 | E250 / Fe410WA | Indian standard structural steel; yield ≥250 MPa, tensile ≥410 MPa |
| International | ISO 630 | S235 | ISO structural grade; similar to S235JR |
| Brazil | ABNT NBR 5008 | CE 24 | Brazilian structural steel; comparable mechanical properties |
| South Africa | SANS 1431 | 300WA | Weldable structural steel; yield ≥300 MPa (slightly higher) |
Notes:
St37-2 material is typically delivered in the as-rolled condition and may exhibit a mill scale surface. For ERW pipes, additional requirements for dimensional tolerances, straightness, and pressure tests should be defined by the relevant product standard (e.g., EN 10217-1, EN 10219-1, or API 5L for pipeline applications). Although DIN 17100 has been withdrawn, St37-2 is still commercially available and is normally certified to the modern equivalent EN 10025-2 S235JR. When ordering, it is recommended to specify the steel according to the current standard and to include any supplementary requirements for impact testing or specific chemical restrictions if needed.
- Share
