DIN 1626 St37 St44 St37 St42 St45 Cold Drawn Seamless Steel Pipe Carbon Steel Tube For Low Temperature Pressure
Introduction
DIN 1626 is a standard that specifies the requirements for cold drawn seamless steel pipes made from carbon steel, particularly designed for low-temperature pressure applications. This article provides an overview of the material specifications, key features, chemical composition, mechanical properties, steel grades, applications, and possible alternative grades.
Material Specification
The DIN 1626 standard covers various grades of carbon steel pipes, including St37, St44, St42, and St45. These materials are characterized by their excellent mechanical properties and suitability for low-temperature environments.
Key Features
- Seamless Construction: Ensures uniformity and strength.
- Cold Drawn: Enhances dimensional accuracy and surface finish.
- Low-Temperature Resistance: Suitable for applications in cold environments.
- High Strength: Capable of withstanding high pressure.
Chemical Composition
| Steel Grade | C (%) | Si (%) | Mn (%) | P (%) | S (%) |
| St37 | 0.17 | 0.25 | 1.20 | 0.045 | 0.045 |
| St44 | 0.20 | 0.25 | 1.40 | 0.045 | 0.045 |
| St42 | 0.20 | 0.25 | 1.20 | 0.045 | 0.045 |
| St45 | 0.25 | 0.25 | 1.60 | 0.045 | 0.045 |
Mechanical Properties
| Steel Grade | Yield Strength (MPa) | Tensile Strength (MPa) | Elongation (%) |
| St37 | 235 | 360-510 | 26 |
| St44 | 275 | 410-550 | 24 |
| St42 | 245 | 400-550 | 22 |
| St45 | 295 | 450-600 | 20 |
Steel Grade
The primary steel grades covered under DIN 1626 include:
- St37: Low carbon steel, good weldability.
- St44: Medium carbon steel, higher strength.
- St42: Similar to St37 but with improved mechanical properties.
- St45: Higher carbon content, suitable for more demanding applications.
Application
DIN 1626 seamless steel pipes are widely used in various industries, including:
- Oil and Gas: For pipelines and pressure vessels.
- Chemical Industry: In reactors and heat exchangers.
- Construction: Structural applications requiring high strength.
- Cryogenic Applications: Suitable for low-temperature environments.
Possible Alternative Grades
In addition to the specified grades, the following alternative grades may be considered based on specific requirements:
- ASTM A106: Standard specification for seamless carbon steel pipes for high-temperature service.
- ASTM A53: Standard specification for pipe, steel, black and hot-dipped, zinc-coated, welded, and seamless.
- EN 10216: European standard for seamless steel tubes for pressure purposes.
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