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ASTM A182 F53 is a super duplex stainless steel alloy with significant amounts of nickel, chromium and molybdenum. Super duplex UNS S32750 contains significant amounts of chromium and molybdenum, giving it excellent resistance to pitting and crevice corrosion, especially in corrosive environments containing chlorides. The nitrogen content also increases the strength and corrosion resistance of the SA182 F53 material.
ASTM A182 Duplex F53 Chemical Composition:
1. Chromium (Cr): 24.0 - 26.0%
2. Nickel (Ni): 6.0 - 8.0%
3. Molybdenum (Mo): 3.0 - 5.0%
4. Nitrogen (N): 0.24 - 0.32%
5. Manganese (Mn): ≤ 1.20%
6. Silicon (Si): ≤ 0.80%
7. Phosphorus (P): ≤ 0.035%
8. Sulfur (S): ≤ 0.020%
9. Copper (Cu): ≤ 0.50%
10. Iron (Fe): Balance (remainder of the composition)
Pitting Resistance Equivalent Number (PREN) and Mechanical Limits
The defining performance characteristic of super duplex UNS S32750 components is a minimum PREN value greater than 40. Calculated via the standard formula:
This threshold confirms that A182 F53 forged flanges can successfully operate in severe offshore systems, brackish water loops, and sour hydrocarbon processing environments without experiencing localized chloride pitting.
Minimum Mechanical Properties:
Tensile Strength: Minimum 750 MPa (110 ksi)
Yield Strength (0.2% Offset): Minimum 550 MPa (80 ksi)
Elongation Limit: Minimum 15%
Industrial Applications for ASTM A182 F53 Forgings
Due to its high yield strength and exceptional chloride resistance, F53 forgings allow engineers to optimize wall thicknesses and reduce the total structural footprint of critical assemblies. Common applications include:
Subsea Oil & Gas Systems: High-pressure subsea manifolds, christmas tree forgings, and pipeline connections.
Desalination Plants: High-pressure reverse osmosis (RO) pump housings, brine piping links, and valve bodies.
Chemical Infrastructure: Acetic acid production, organic acid processing tanks, and complex heat exchanger components.
Technical Component Manufacturing Scope
The broad ASTM A182 standard specification defines the forging criteria for high-temperature and corrosive pressure systems. Common product configurations include:
Industrial Pipe Flanges: Weld Neck (WNF), Slip-On (SO), Blind Flanges, and Socket Weld (SW) structures up to Class 2500 ratings.
Forged Pipe Fittings: High-pressure 3000lb and 6000lb elbows, tees, unions, swages, and threadolets.
Custom Valve Parts: Forged valve bodies, balls, stems, and rings engineered for severe flow control applications.
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Huitong Pipeline Equipment manufactures and supplies premium ASTM A182 F53 forged flanges, super duplex UNS S32750 pipe fittings, and pre-fabricated heavy pipe spools complete with EN 10204 3.1 mill test certificates.
