ASTM B673 N08925 Welded Steel Tube Nickel Iron Chromium Molybdenum Welded Pipe For General Purpose
ASTM B673 N08925 N08354 N08926 Welded Steel Tube Nickel Iron Chromium Molybdenum Welded Pipe for General Purpose
Material
The ASTM B673 specification covers welded steel tubes made from nickel, iron, chromium, and molybdenum alloys. These materials are specifically designed to provide excellent corrosion resistance and mechanical properties, making them suitable for various industrial applications.
Specification
The specification outlines the requirements for the manufacture of welded pipes, including dimensions, tolerances, and testing methods. The pipes are typically used in environments where resistance to corrosion and high temperatures is critical.
Key Features
- Corrosion Resistance: Excellent resistance to pitting and crevice corrosion.
- High Strength: Capable of withstanding high pressures and temperatures.
- Weldability: Designed for easy welding and fabrication.
- Durability: Long service life in harsh environments.
Chemical Composition
| Alloy Grade | Ni (%) | Cr (%) | Mo (%) | Fe (%) | Other Elements |
|---|---|---|---|---|---|
| N08925 | 40.0 | 20.0 | 3.0 | Balance | Cu, C, Si |
| N08354 | 30.0 | 20.0 | 4.0 | Balance | C, Si |
| N08926 | 35.0 | 20.0 | 6.0 | Balance | C, Si |
Mechanical Properties
| Property | N08925 | N08354 | N08926 |
|---|---|---|---|
| Yield Strength (MPa) | 310 | 275 | 310 |
| Tensile Strength (MPa) | 620 | 550 | 620 |
| Elongation (%) | 40 | 35 | 40 |
| Hardness (HB) | 200 | 190 | 200 |
Steel Grade
The primary steel grades covered under ASTM B673 include:
- N08925
- N08354
- N08926
These grades are selected based on their specific chemical compositions and mechanical properties, tailored for different applications.
Application
The welded pipes produced under ASTM B673 are widely used in:
- Chemical processing industries
- Oil and gas exploration
- Marine applications
- Power generation
- Pharmaceutical manufacturing
Possible Alternative Grades
While N08925, N08354, and N08926 are the primary grades, alternative grades that may be considered include:
- Alloy 625: Known for its high strength and excellent corrosion resistance.
- Alloy 825: Offers good resistance to both oxidation and reduction environments.
- Alloy 316L: A lower carbon version of 316 stainless steel, suitable for high-temperature applications.
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