DIN 2391 ST37 Seamless Precision Steel Tubes Cold Drawn Seamless Carbon Steel Pipe
DIN 2391 ST37 Seamless Precision Steel Tubes Cold Drawn Seamless Carbon Steel Pipe
Material
DIN 2391 ST37 seamless precision steel tubes are manufactured from medium carbon steel (carbon steel) with excellent weldability, machinability, and strength. The material is cold drawn to achieve tighter tolerances and superior surface finish compared to hot finished pipes.
Specification
- Standard: DIN 2391
- Material Grade: ST37
- Type: Seamless cold drawn precision steel tubes
- Manufacturing Process: Hot finished seamless followed by cold drawing/pilgering
- Dimensions: Outer diameter and wall thickness as per DIN 2391 standards, precise tolerances ensured
- Surface finish: Smooth, precise with minimal machining allowances
Key Features
- High dimensional accuracy and tight tolerances
- Smooth surface finish without scale or rust
- Excellent mechanical properties suitable for engineering applications
- Good weldability and machinability
- Available in various sizes and lengths according to DIN 2391 standards
- Widely used in hydraulic cylinders, mechanical parts, automotive components, and construction
Chemical Composition
| Element | Min (%) | Max (%) |
|---|---|---|
| Carbon (C) | 0.12 | 0.20 |
| Manganese (Mn) | 0.30 | 0.65 |
| Phosphorus (P) | — | 0.045 |
| Sulfur (S) | — | 0.045 |
| Silicon (Si) | — | 0.40 |
| Copper (Cu) | — | 0.35 |
| Nickel (Ni) | — | 0.30 |
| Chromium (Cr) | — | 0.30 |
| Molybdenum (Mo) | — | 0.08 |
Note: Actual composition may vary slightly depending on manufacturer specifications.
Mechanical Properties
| Property | Value (Typical) |
|---|---|
| Tensile Strength (Rm) | 370 - 510 MPa |
| Yield Strength (Re) | ≥ 235 MPa |
| Elongation (A5) | ≥ 26% |
| Hardness (Brinell) | Max 150 HB |
| Impact Energy (Charpy V-notch) | ≥ 27 J (at 20°C) |
Steel Grade
The steel grade ST37 corresponds to a mild/medium carbon steel with moderate strength and good ductility, used widely in structural and mechanical engineering.
Application
- Hydraulic and pneumatic cylinders
- Precision mechanical parts
- Automotive and machine building industry
- Structural components requiring tight tolerances and high surface quality
- Axles, shafts, pins, and bolts
- Furniture and fitness equipment manufacturing
Equivalent Grades
| Standard | Equivalent Grade |
|---|---|
| DIN EN 10025 | S235JR |
| DIN 17100 | St 37-2 |
| ISO 630 | C22E |
| ASTM A106 | Grade B (similar but not identical) |
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