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Carbon Steel
EN10305-4
E355
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Chemical Composition
| Steel Grade | Chemical Components (%) | ||||||
| Steel Name | Steel Number | C Max. | Si Max. | Mn Max. | P Max. | S Max. | AL Min. |
| E215 | 1.0212 | 0.10 | 0.05 | 0.7 | 0.025 | 0.025 | 0.025 |
| E235 | 1.0308 | 0.17 | 0.35 | 1.2 | 0.025 | 0.025 | / |
| E355 | 1.058 | 0.22 | 0.55 | 1.6 | 0.025 | 0.025 | / |
Delivery Conditions
The tubes shall be manufactured from hot-finished seamless tubes by cold drawing or other suitable processes. The tubes shall be supplied in one of the delivery conditions as follows.
| Designation | Symbol | Description |
| Cold-drawn/hard | +C | No heat treatment after the final cold drawing process |
| Cold-drawn/soft | +LC | After the final heat treatment, there is a suitable drawing pass |
| Cold drawn and stress relieved | +SR | After the final cold drawing process, there is a stress relief heat treatment in a controlled atmosphere |
| Annealed | +A | After the final cold drawing process, the tubes are annealed in a controlled atmosphere |
| Normalized | +N | After the final cold drawing operation, the tubes are normalized in a controlled atmosphere |
Desciption
1. By Standard & Application Category:
Standard: EN 10305-4 - "Steel tubes for precision applications - Technical delivery conditions - Seamless cold drawn tubes"
Application Category: Precision engineering components requiring high dimensional accuracy, excellent surface finish, and superior mechanical properties. Typical uses include hydraulic and pneumatic cylinders, automotive shock absorbers, bearing sleeves, and high-precision mechanical parts.
2. By Manufacturing Process:
Type: Seamless
Process: Cold Drawn. The tube is manufactured from a solid steel billet that is pierced to form a hollow shell, which is then cold-drawn through a die at room temperature. This process ensures:
Exceptional dimensional tolerances.
A very smooth internal and external surface finish.
Enhanced mechanical strength through work hardening.
3. By Material Grade:
Steel Grade: E355 according to EN 10273. This is a fine-grained, non-alloy quality steel with a specified minimum yield strength of 355 MPa.
Key Characteristics:
Strength: Offers a good balance of high strength and toughness.
Weldability: Suitable for welding under specified conditions.
Machinability: Responds well to further machining operations.
4. By Key Properties:
Dimensional Accuracy: Conforms to the strict "cold drawn" tolerances specified in EN 10305-4 for outer diameter (OD) and wall thickness (WT).
Mechanical Properties: Guaranteed minimum values for Tensile Strength, Yield Strength (Rp0.2), and Elongation.
Surface Quality: Typically has a smooth, bright surface suitable for critical applications without further finishing.
5. By Compliance & Certification:
Certification: Supplied with a 3.1 Inspection Certificate, which validates compliance with the standard's chemical and mechanical properties.
Traceability: Each batch is traceable to its manufacturing heat number.
Chemical Composition
| Steel Grade | Chemical Components (%) | ||||||
| Steel Name | Steel Number | C Max. | Si Max. | Mn Max. | P Max. | S Max. | AL Min. |
| E215 | 1.0212 | 0.10 | 0.05 | 0.7 | 0.025 | 0.025 | 0.025 |
| E235 | 1.0308 | 0.17 | 0.35 | 1.2 | 0.025 | 0.025 | / |
| E355 | 1.058 | 0.22 | 0.55 | 1.6 | 0.025 | 0.025 | / |
Delivery Conditions
The tubes shall be manufactured from hot-finished seamless tubes by cold drawing or other suitable processes. The tubes shall be supplied in one of the delivery conditions as follows.
| Designation | Symbol | Description |
| Cold-drawn/hard | +C | No heat treatment after the final cold drawing process |
| Cold-drawn/soft | +LC | After the final heat treatment, there is a suitable drawing pass |
| Cold drawn and stress relieved | +SR | After the final cold drawing process, there is a stress relief heat treatment in a controlled atmosphere |
| Annealed | +A | After the final cold drawing process, the tubes are annealed in a controlled atmosphere |
| Normalized | +N | After the final cold drawing operation, the tubes are normalized in a controlled atmosphere |
Desciption
1. By Standard & Application Category:
Standard: EN 10305-4 - "Steel tubes for precision applications - Technical delivery conditions - Seamless cold drawn tubes"
Application Category: Precision engineering components requiring high dimensional accuracy, excellent surface finish, and superior mechanical properties. Typical uses include hydraulic and pneumatic cylinders, automotive shock absorbers, bearing sleeves, and high-precision mechanical parts.
2. By Manufacturing Process:
Type: Seamless
Process: Cold Drawn. The tube is manufactured from a solid steel billet that is pierced to form a hollow shell, which is then cold-drawn through a die at room temperature. This process ensures:
Exceptional dimensional tolerances.
A very smooth internal and external surface finish.
Enhanced mechanical strength through work hardening.
3. By Material Grade:
Steel Grade: E355 according to EN 10273. This is a fine-grained, non-alloy quality steel with a specified minimum yield strength of 355 MPa.
Key Characteristics:
Strength: Offers a good balance of high strength and toughness.
Weldability: Suitable for welding under specified conditions.
Machinability: Responds well to further machining operations.
4. By Key Properties:
Dimensional Accuracy: Conforms to the strict "cold drawn" tolerances specified in EN 10305-4 for outer diameter (OD) and wall thickness (WT).
Mechanical Properties: Guaranteed minimum values for Tensile Strength, Yield Strength (Rp0.2), and Elongation.
Surface Quality: Typically has a smooth, bright surface suitable for critical applications without further finishing.
5. By Compliance & Certification:
Certification: Supplied with a 3.1 Inspection Certificate, which validates compliance with the standard's chemical and mechanical properties.
Traceability: Each batch is traceable to its manufacturing heat number.
