DIN 17178 Welded Round Steel Tubes: St35.8, StE 255, StE 355, StE 420, StE 460
For Special Requirements
DIN 17178 is a standard specification for welded circular fine grain steel tubes, designed to meet special requirements in various industrial applications. This article delves into the material, specifications, key features, chemical composition, mechanical properties, steel grades, applications, and possible alternative grades of these tubes.
Material
The DIN 17178 standard covers a range of steel grades, including St35.8, StE 255, StE 355, StE 420, and StE 460. These materials are known for their fine grain structure, which enhances their mechanical properties and makes them suitable for demanding applications.
Specification
DIN 17178 specifies the requirements for welded round steel tubes with fine grain steel. These tubes are primarily used in applications where high strength, toughness, and resistance to dynamic stresses are required. The standard ensures that the tubes meet specific quality and performance criteria.
Key Features
- High Strength: The fine grain structure provides excellent strength and toughness.
- Weldability: These tubes are designed to be easily welded, making them suitable for various fabrication processes.
- Corrosion Resistance: Enhanced resistance to corrosion, especially when used in harsh environments.
- Versatility: Suitable for a wide range of applications, including construction, automotive, and machinery.
Chemical Composition
The chemical composition of the steel grades under DIN 17178 is crucial for their performance. Below is a table presenting the typical chemical composition for these grades:
| Element |
St35.8 |
StE 255 |
StE 355 |
StE 420 |
StE 460 |
| C |
0.17 |
0.20 |
0.22 |
0.20 |
0.20 |
| Si |
0.35 |
0.35 |
0.55 |
0.55 |
0.55 |
| Mn |
0.40 |
1.40 |
1.60 |
1.60 |
1.60 |
| P |
0.025 |
0.025 |
0.025 |
0.025 |
0.025 |
| S |
0.025 |
0.025 |
0.025 |
0.025 |
0.025 |
Mechanical Properties
The mechanical properties of these steel grades are essential for their performance in various applications. The table below outlines the typical mechanical properties:
| Property |
St35.8 |
StE 255 |
StE 355 |
StE 420 |
StE 460 |
| Yield Strength (MPa) |
235 |
255 |
355 |
420 |
460 |
| Tensile Strength (MPa) |
360-480 |
410-530 |
490-630 |
520-680 |
550-720 |
| Elongation (%) |
25 |
22 |
20 |
19 |
18 |
Steel Grade
The steel grades covered by DIN 17178 include:
- St35.8: Known for its good weldability and moderate strength.
- StE 255: Offers improved strength and toughness.
- StE 355: Provides a balance of strength and ductility.
- StE 420: High strength with good toughness.
- StE 460: Offers the highest strength among the grades, suitable for demanding applications.
Application
These welded round steel tubes are used in various applications, including:
- Construction: Structural components and frameworks.
- Automotive: Parts requiring high strength and durability.
- Machinery: Components subjected to dynamic stresses.
- Energy Sector: Pipelines and pressure vessels.
Possible Alternative Grades
In some cases, alternative grades may be considered based on specific requirements:
- EN 10217: A similar European standard for welded steel tubes.
- ASTM A53: An American standard for welded and seamless steel pipes.
- JIS G3454: A Japanese standard for carbon steel pipes.
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