ASTM A234 WP9 is a standard specification for wrought carbon and alloy steel fittings of seamless and welded construction. These fittings are intended for use in high-temperature and high-pressure service. ASTM A234 WP9 fittings are made from a chromium-molybdenum alloy known as Grade WP9, which provides excellent resistance to high-temperature environments. These fittings are widely used in industries such as power generation, petrochemical, oil and gas, and refineries, where elevated temperatures and pressures are common.
They are available in various shapes and sizes, including elbows, tees, reducers, caps, and more. The fittings are manufactured through processes like forging, heat treatment, and machining to meet the required mechanical properties and dimensions. When working with ASTM A234 WP9 fittings, it's important to follow proper welding and installation practices to ensure the integrity of the connections. These fittings can withstand temperatures up to a certain limit and are designed to maintain their mechanical properties under such conditions.
ASTM A234 WP9 fittings are crucial components in high-temperature and high-pressure industrial applications. They offer the necessary strength and corrosion resistance required for demanding environments, making them a preferred choice for various critical sectors.
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Specification:
| Specification | Description |
| Standard | ASTM A234/A234M |
| Grade | WP9 |
| Material | Carbon and Alloy Steel |
| Manufacturing | Seamless and Welded |
| Temperature Range | High-temperature applications up to a certain limit |
| Pressure Range | High-pressure environments |
| Alloy Composition | Chromium (Cr): 8.00-10.00%, Molybdenum (Mo): 0.90-1.10% |
| Common Types | Elbows, Tees, Reducers, Caps, etc. |
| Applications | Power generation, Petrochemical, Oil and Gas, Refineries |
Chemical Composition of ASTM A234 WP9 FITTINGS
| Element | Minimum (%) | Maximum (%) |
| Carbon (C) | - | 0.15 |
| Manganese (Mn) | 0.30 | 0.60 |
| Phosphorus (P) | - | 0.030 |
| Sulfur (S) | - | 0.030 |
| Silicon (Si) | 0.25 | 1.00 |
| Chromium (Cr) | 8.00 | 10.00 |
| Molybdenum (Mo) | 0.90 | 1.10 |
| Vanadium (V) | 0.18 | 0.25 |
Mechanical Properties of ASTM A234 WP9 FITTINGS
| Property | Value |
| Tensile Strength | 415 MPa (60,000 psi) min |
| Yield Strength | 240 MPa (35,000 psi) min |
| Elongation | 20% min |
| Hardness (HB) | 179 max |
Advantages of ASTM A234 WP9 FITTINGS
- Good general corrosion resistance and high strength
- Good sulfide stress corrosion resistance
- Resistance to chloride pitting and crevice corrosion
- Higher resistance to chloride stress corrosion cracking
- Easy to weld and conform
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| Pharmaceutical Equipment | Chemical Equipment |
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| Heat Exchangers | Gas Processing |
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