ASTM A815 S32750 Duplex Steel Fitting Elbow 90 Degree Long Radius Buttweld B16.9
ASTM A815 standard is applicable for the manufacture, testing, and inspection of duplex stainless steel fittings used in high temperature, high pressure, and corrosive environments. These fittings include but are not limited to elbows, flanges, tees, pipe caps, and other types. This standard covers various duplex stainless steel materials such as UNS S31803, S32205, S32750, etc., and different materials are suitable for different environmental conditions. For example, S31803 (ferritic austenitic stainless steel) is suitable for low-temperature environments, while S32205 is more suitable for high-temperature and high-pressure environments.
ASTM A815 Duplex Stainless Steel Chemical Composition
| GRA. WP | UNS GRA. | CHEMICAL COMPOSITION % MAXIMUM |
| C | MN | P | S | SI | CR | NI | MO | CU | N |
| WPS31803 | S31803 | 0.03 | 2.0 | 0.030 | 0.02 | 1.0 | 21.0-23.0 | 4.5-6.5 | 2.5-3.5 | --- | 0.08-0.20 |
| WPS32202 | S32202 | 0.03 | 2.0 | 0.040 | 0.01 | 1.0 | 21.5-24.0 | 1.0-2.8 | 0.45 | --- | 0.18-0.26 |
| WPS32750 | S32750 | 0.03 | 1.2 | 0.035 | 0.02 | 0.8 | 24.0-26.0 | 6.0-8.0 | 3.0-5.0 | 0.5 | 0.24-0.32 |
ASTM A815 S32750 Duplex Steel Pipe Fittings Key Advantages
- Excellent resistance to chloride pitting and crevice corrosion
- Strong resistance to chloride and sulfide stress corrosion cracking
- Extremely high mechanical strength, enabling high pressure resistance while reducing wall thickness
- Excellent overall mechanical properties, balancing strength and toughness
ASTM A815 Duplex Stainless Steel Mechanical Properties
| GRA. WP | UNS GRA. | Temperature | Cooling | Tempering Temperature |
| WPS31803 | S31803 | 1870–2010 °F [1020–1100 °C] | Water quench or rapidly cooled by other means | Not required |
| WPS32202 | S32202 | 1870–1975 °F [1020–1080 °C] | Water quench or rapidly cooled by other means | Not required |
| WPS32750 | S32750 | 1920–2060 °F [1025–1125 °C] | Water quench or rapidly cooled by other means | Not required |
ASTM A815 S32750 Duplex Stainless Steel Fitting Application
- Oil and gas industry: ASTM A815 S32750 duplex stainless steel fittings are commonly used in the manufacture of oil drilling platforms and subsea pipelines. These fittings perform well in harsh environments containing chloride ions, sulfides, and acidity, ensuring safety and stability during oil and gas extraction.
- Marine Engineering: ASTM A815 S32750 duplex stainless steel fittings are widely used in the manufacturing of FPSOs (Floating Production Storage Units), ships, seawater desalination equipment, and subsea pipelines in marine engineering. Its excellent resistance to seawater corrosion ensures the long-term stable operation of these devices in marine environments.
- Chemical processing industry: In the field of chemical processing, ASTM A815 S32750 duplex stainless steel pipe fittings have become an ideal material for handling highly corrosive media such as sulfuric acid and phosphoric acid. These fittings can be used to manufacture containers, reactors, pipelines, as well as chemical storage and transportation equipment, effectively extending the service life of the equipment and reducing maintenance costs.
- Other industrial fields: In addition to the above-mentioned fields, ASTM A815 S32750 duplex stainless steel pipe fittings are widely used in various industries such as power, machinery, electronics, and environmental protection. Especially in situations that require high strength and corrosion resistance, such as heat exchangers, water injection systems, etc., these pipe fittings play an important role.
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