ASTM A234 WP11 Alloy Steel Fitting Buttwelded for Chemical Industry B16.9
ASTM A234 is a standard developed by the American Society for Testing and Materials (ASTM) for carbon steel and alloy steel butt welded pipe fittings used in medium to high temperature services. These fittings are mainly used in pipeline systems in industries such as petroleum, chemical, and power, especially in environments that require high temperature resistance and corrosion resistance.
WP11 belongs to chromium molybdenum alloy steel, in which the addition of chromium (Cr) and molybdenum (Mo) enhances the resistance to sulfide corrosion and oxidation, and has good high-temperature strength, oxidation resistance, and creep resistance. It is usually used in the temperature range of -29 ° C to 593 ° C and is suitable for high-temperature and high-pressure working conditions.
ASTM A234 WP11 Alloy Steel Fitting Chemical Requirements
WP11 is further divided into three subcategories based on its composition: Class 1, Class 2, and Class 3
GRADE
| ASTM A234 WP11 CHEMICAL COMPOSITION % MAXIMUM |
| C | MN | P | S | SI | CR | MO |
| WP11 CL1 | 0.05-0.15 | 0.30-0.60 | 0.030 | 0.030 | 0.50-1.00 | 1.00-1.50 | 0.44-0.65 |
| WP11 CL2 | 0.05-0.20 | 0.30-0.80 | 0.040 | 0.040 | 0.50-1.00 | 1.00-1.50 | 0.44-0.65 |
| WP11 CL3 | 0.05-0.20 | 0.30-0.80 | 0.040 | 0.040 | 0.50-1.00 | 1.00-1.50 | 0.44-0.65 |
ASTM A234 WP11 Alloy Steel Fitting Mechanical Properties
| Grade | Tensile Strength, min. | Yield Strength, min. |
| ksi[MPa] | ksi[MPa] |
| WP11 CL1 | 60[415] | 30[205] |
| WP11 CL2 | 70[485] | 40[275] |
| WP11 CL3 | 75[520] | 45[310] |
ASTM A234 WP11 Alloy Steel Fitting Manufacturing and Testing Requirements
- Manufacturing process: ASTM A234 WP11 alloy steel fittings are manufactured through hot forming or cold forming processes. Common types of fittings include elbows, tees, reducers, caps, etc.
- Heat treatment requirements: ASTM A234 WP11 alloy steel fittings need to undergo normalizing or normalizing+tempering to eliminate residual stress and optimize mechanical properties.
- Weldability: ASTM A234 WP11 alloy steel fittings require preheating (recommended 150-300 ° C) and control of interlayer temperature during welding, and stress annealing is required after welding.
ASTM A234 WP11 Alloy Steel Compared to Other Grades
| Grade | Material characteristics |
| WP9 | WP11 has a higher chromium molybdenum content and stronger temperature resistance. |
| WP22 | WP22 (2.25Cr-1Mo) is suitable for higher temperatures, but WP11 has a lower cost. |
ASTM A234 WP11 Alloy Steel Fitting Application:
- Oil and gas: In the field of oil and gas, ASTM A234 WP11 alloy steel fittings can be widely used in high-temperature oil and gas transmission pipelines and refining equipment.
- Power plant: In the power industry, ASTM A234 WP11 alloy steel fittings can be widely used in boiler systems, steam pipelines, and heat exchangers.
- Chemical plant: ASTM A234 WP11 alloy steel fittings can be widely used in high-temperature reactors and high-pressure vessel connections in chemical equipment.
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