ASTM A815 S32750 Duplex Stainless Steel Fitting Elbow 90 Degree Long Radius Buttwelded
ASTM A815 S32750 Duplex Steel Fitting Elbow 90 Degree Long Radius Buttwelded
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
-
Marine and Offshore: Seawater cooling systems, fire protection systems, subsea pipelines, marine pumps and valves.
-
Oil and Gas: Oil and gas extraction pipelines and processing facilities in high-chlorine, high-humidity, acidic environments; heat exchangers and process piping in refineries.
-
Chemical and Process Industries: Reactors, heat exchangers, and pipelines in high-chloride environments.
-
Flue Gas Desulfurization Systems: Wet flue section at the absorber tower outlet.
-
Pulp and Paper Industry: Equipment for treating corrosive cooking liquor and bleaching agents.
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