Description
Forged Pipe Fittings ASTM A105
Standard Scope
ASTM A105 is a standard specification for forged carbon steel piping components for use in pressure systems at ambient and higher temperatures. This specification covers forged fittings, flanges, and valves that are intended for use in piping systems where the temperature does not exceed 400°F (204°C).
Material
The primary material used in ASTM A105 fittings is carbon steel. The chemical composition typically includes:
- Carbon (C): 0.35% max
- Manganese (Mn): 0.60% – 0.90%
- Phosphorus (P): 0.04% max
- Sulfur (S): 0.05% max
These materials are selected for their strength, ductility, and ability to withstand high pressures.
Specification
ASTM A105 specifies the requirements for forged carbon steel fittings, including:
- Types of Fittings: Elbows, tees, reducers, and caps.
- Manufacturing Process: The fittings must be forged and can be produced by hot or cold working.
- Heat Treatment: Depending on the application, heat treatment may be required to achieve desired mechanical properties.
Key Features
- High Strength: Designed to withstand high pressures and temperatures.
- Versatility: Suitable for a wide range of applications in various industries.
- Corrosion Resistance: While not inherently corrosion-resistant, coatings can be applied for enhanced protection.
- Ease of Installation: Forged fittings are easier to install compared to welded fittings.
Mechanical Properties
| Property | Value |
|---|---|
| Yield Strength (min) | 36,000 psi (250 MPa) |
| Tensile Strength (min) | 70,000 psi (485 MPa) |
| Elongation (min) | 20% |
| Hardness | 187 HB max |
These mechanical properties ensure that ASTM A105 fittings can perform reliably under various conditions.
Pressure Test
ASTM A105 fittings are subjected to rigorous pressure testing to ensure their integrity and performance under pressure. The standard pressure test includes:
- Hydrostatic Testing: Each fitting is tested at a pressure that is 1.5 times the maximum allowable working pressure (MAWP).
- Leak Testing: After hydrostatic testing, fittings are inspected for leaks to ensure they meet safety standards.
Application
ASTM A105 forged pipe fittings are widely used in various industries, including:
- Oil and Gas: For pipelines and refineries.
- Chemical Processing: In systems handling corrosive materials.
- Power Generation: In steam and cooling systems.
- Water Treatment: For municipal and industrial water systems.
