DIN 17177 St37.8 Electric Resistance Welded Steel Pipe Electric Pressure Pipe For Elevated Temperatures
DIN 17177 St37.8 St42.8 15Mo3 Electric Resistance Welded Steel Pipe Electric Pressure Pipe For Elevated Temperatures
Material
DIN 17177 is a standard that specifies the requirements for electric resistance welded (ERW) steel pipes used for elevated temperature applications. The pipes are designed to withstand high pressures and temperatures, making them suitable for various industrial applications.
Specification
The standard outlines the specifications for the manufacturing process, dimensions, tolerances, and testing methods for the steel pipes. It ensures that the pipes meet the necessary quality and performance criteria for use in critical applications.
Key Features
- High Strength: Designed to withstand high pressures and temperatures.
- Welded Construction: Electric resistance welding provides a strong and reliable joint.
- Corrosion Resistance: Suitable for various environments, depending on the coating and treatment.
- Versatile Applications: Used in power plants, chemical industries, and other high-temperature applications.
Chemical Composition
| Element | St37.8 (%) | St42.8 (%) | 15Mo3 (%) |
|---|---|---|---|
| Carbon (C) | 0.17 max | 0.22 max | 0.12-0.20 |
| Manganese (Mn) | 1.20-1.60 | 1.20-1.60 | 0.40-0.70 |
| Phosphorus (P) | 0.035 max | 0.035 max | 0.025 max |
| Sulfur (S) | 0.035 max | 0.035 max | 0.025 max |
| Chromium (Cr) | - | - | 0.90-1.20 |
| Molybdenum (Mo) | - | - | 0.30-0.50 |
Mechanical Properties
| Property | St37.8 | St42.8 | 15Mo3 |
|---|---|---|---|
| Yield Strength (MPa) | 235 | 245 | 250 |
| Tensile Strength (MPa) | 360-510 | 360-510 | 400-550 |
| Elongation (%) | 22 min | 22 min | 20 min |
| Hardness (HB) | 140 max | 140 max | 160 max |
Steel Grade
- St37.8: Low carbon steel suitable for moderate temperature applications.
- St42.8: Higher carbon content for improved strength and temperature resistance.
- 15Mo3: Alloy steel with molybdenum, designed for high-temperature applications.
Application
These steel pipes are primarily used in:
- Power generation plants
- Chemical processing industries
- Oil and gas industries
- Boiler and pressure vessel manufacturing
Possible Alternative Grades
- P235GH: Similar properties, suitable for pressure applications.
- P265GH: Higher strength, used in similar applications.
- A106 Grade B: Commonly used for high-temperature service.
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