DIN 17457: Welded Circular Steel Tube Austenitic Stainless Steel Tubes for Special Requirements
Introduction
DIN 17457 specifies the requirements for welded circular steel tubes made from austenitic stainless steel. These tubes are designed for special applications where corrosion resistance, strength, and durability are paramount. This article will delve into the material specifications, key features, chemical composition, mechanical properties, steel grades, applications, and possible alternative grades.
Material Specifications
The austenitic stainless steel grades covered under DIN 17457 include:
- 1.4301 (AISI 304)
- 1.4306 (AISI 304L)
- 1.4311 (AISI 304LN)
- 1.4541 (AISI 321)
- 1.4550 (AISI 316Ti)
Key Features
- Corrosion Resistance: Excellent resistance to oxidation and corrosion.
- Weldability: Good weldability, allowing for easy fabrication.
- Strength: High tensile strength and durability.
- Temperature Resistance: Suitable for high-temperature applications.
- Versatility: Can be used in various industries including food processing, chemical, and construction.
Chemical Composition
| Steel Grade | C (%) | Cr (%) | Ni (%) | Mo (%) | Mn (%) | Si (%) | P (%) | S (%) |
| 1.4301 | ≤0.07 | 18.0-20.0 | 8.0-10.5 | - | ≤2.0 | ≤1.0 | ≤0.045 | ≤0.03 |
| 1.4306 | ≤0.03 | 18.0-20.0 | 8.0-12.0 | - | ≤2.0 | ≤1.0 | ≤0.045 | ≤0.03 |
| 1.4311 | ≤0.03 | 18.0-20.0 | 8.0-12.0 | - | ≤2.0 | ≤1.0 | ≤0.045 | ≤0.03 |
| 1.4541 | ≤0.08 | 17.0-19.0 | 9.0-12.0 | 2.0-3.0 | ≤2.0 | ≤1.0 | ≤0.045 | ≤0.03 |
| 1.4550 | ≤0.08 | 16.0-18.0 | 10.0-14.0 | 5.0-7.0 | ≤2.0 | ≤1.0 | ≤0.045 | ≤0.03 |
Mechanical Properties
| Steel Grade | Yield Strength (MPa) | Tensile Strength (MPa) | Elongation (%) | Hardness (HB) |
| 1.4301 | ≥210 | 520-720 | ≥40 | ≤187 |
| 1.4306 | ≥220 | 480-650 | ≥40 | ≤187 |
| 1.4311 | ≥250 | 600-800 | ≥30 | ≤187 |
| 1.4541 | ≥220 | 520-720 | ≥40 | ≤187 |
| 1.4550 | ≥220 | 520-720 | ≥40 | ≤187 |
Steel Grade
The steel grades specified in DIN 17457 are primarily austenitic stainless steels, known for their excellent corrosion resistance and mechanical properties. The most commonly used grades include:
- 1.4301: General-purpose stainless steel.
- 1.4306: Low carbon variant for improved weldability.
- 1.4311: Nitrogen-strengthened variant for enhanced strength.
- 1.4541: Stabilized grade for high-temperature applications.
- 1.4550: Titanium-stabilized grade for improved corrosion resistance.
Applications
Welded circular steel tubes made from these austenitic stainless steels are widely used in various industries, including:
- Food and Beverage: Equipment and piping systems.
- Chemical Processing: Storage tanks and reactors.
- Construction: Structural components and handrails.
- Pharmaceuticals: Cleanroom applications and equipment.
- Oil and Gas: Pipelines and offshore structures.
Possible Alternative Grades
While the grades specified in DIN 17457 are widely used, there are alternative grades that may be suitable for specific applications:
- AISI 316: Offers better corrosion resistance than AISI 304.
- AISI 310: High-temperature applications due to its superior oxidation resistance.
- AISI 321: Similar to AISI 304 but with better resistance to intergranular corrosion.
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