EN 10025-1 S235JR Structural Steel Tube Hot Rolled Seamless Steel Tube For Mechanical Manufacturing
EN 10025-1 S235JR, S235J0, S235J2G3, S235J2G4, S355J0 Structural Steel Tube Hot Rolled Seamless Steel Tube for Mechanical Manufacturing
Introduction
EN 10025-1 is a European standard that specifies the technical delivery conditions for hot-rolled structural steel products. This article focuses on the S235 and S355 grades, which are commonly used in mechanical manufacturing due to their excellent mechanical properties and versatility.
Material Specification
The S235 and S355 grades are structural steels that are widely used in construction and engineering applications. They are characterized by their good weldability and machinability.
Key Features
- High Strength: These grades offer good tensile strength, making them suitable for various structural applications.
- Weldability: They can be easily welded using conventional methods.
- Versatility: Suitable for a wide range of applications, including construction, automotive, and machinery manufacturing.
Chemical Composition
| Steel Grade | C (%) | Si (%) | Mn (%) | P (%) | S (%) | N (%) |
|---|---|---|---|---|---|---|
| S235JR | 0.17 | 0.55 | 1.40 | 0.04 | 0.05 | 0.012 |
| S235J0 | 0.17 | 0.55 | 1.40 | 0.04 | 0.05 | 0.012 |
| S235J2G3 | 0.17 | 0.55 | 1.40 | 0.04 | 0.05 | 0.012 |
| S235J2G4 | 0.17 | 0.55 | 1.40 | 0.04 | 0.05 | 0.012 |
| S355J0 | 0.22 | 0.55 | 1.60 | 0.04 | 0.05 | 0.012 |
Mechanical Properties
| Steel Grade | Yield Strength (MPa) | Tensile Strength (MPa) | Elongation (%) | Impact Energy (J) |
|---|---|---|---|---|
| S235JR | 235 | 360-510 | 26 | 27 (at 20°C) |
| S235J0 | 235 | 360-510 | 26 | 27 (at 0°C) |
| S235J2G3 | 235 | 360-510 | 26 | 40 (at -20°C) |
| S235J2G4 | 235 | 360-510 | 26 | 40 (at -20°C) |
| S355J0 | 355 | 470-630 | 22 | 27 (at 20°C) |
Steel Grade
- S235JR: General structural steel with a minimum yield strength of 235 MPa.
- S235J0: Similar to S235JR but with improved impact properties at 0°C.
- S235J2G3: Offers better impact resistance at -20°C.
- S235J2G4: Similar to S235J2G3 but with slightly different chemical composition.
- S355J0: Higher yield strength of 355 MPa, suitable for more demanding applications.
Application
These structural steel tubes are widely used in:
- Construction of buildings and bridges
- Manufacturing of machinery and equipment
- Automotive industry
- Structural components in various engineering applications
Possible Alternative Grades
- S235: Lower strength but good for less demanding applications.
- S275: Offers a balance between strength and ductility.
- S355: Higher strength, suitable for heavy-duty applications.
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