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ASME / ANSI B16.9 ASTM A815 UNS S32750 SUPER DUPLEX STEEL SMLS CONCENTRIC REDUCER
Duplex 2507 (UNS S32750) is a super duplex stainless steel developed for applications that demand high strength and corrosion resistance. Alloy 2507 has 25% chromium, 4% molybdenum, and 7% nickel. This high molybdenum, chromium and nitrogen content causes high resistance to chloride pitting and crevice corrosion attack and the duplex structure provides 2507 with exceptional resistance to chloride stress corrosion cracking.
The UNS S32750 standard of Pipe Fittings consists of 25% chromium,
4% molybdenum, and 7% nickel. The UNS S32750 Pipe Fittings have a
50-50 microstructure of ferritic and austenitic steel grades with
improved strength.
Using Super Duplex UNS S32750 must be restricted to applications
below 600° F (316° C). Extended elevated temperature exposure can
reduce both the toughness and corrosion resistance of alloy 2507.
Specification
ASTM A815/A815M-20 Standard Specification for Wrought Ferritic, Ferritic/Austenitic, and Martensitic Stainless Steel Piping Fittings.
| Specifications | ASTM A815 / ASME SA815 |
| Size | Seamless Butt Weld Fittings: 1/2″ – 24″, Welded Butt Weld Fittings: 1/2″ – 48″ |
| Standards | ASME/ANSI B16.9, ASME B16.28, MSS-SP-43 |
| Thickness | 5s, 10s, 40s, 80s, 10, 20, 40, STD, 60, 80, XS, 100, 120, 140, 160, XXS available with NACE MR 01-75 |
| Type | Seamless / Welded / Fabricated |
Chemical Composition
| Grade | C | Mn | Si | P | S | Cr | Mo | Ni | N | Fe |
| S32750 | 0.030 max | 1.20 max | 0.80 max | 0.035 max | 0.020 max | 24.00 – 26.00 | 3.00 – 5.00 | 6.00 – 8.00 | 0.24 – 0.32 | 58.095 min |
| Grades | Density (g/cm 3) | Density (lb/in 3) | Melting Point (°C) | Melting Point (°F) |
| S32750 | 7.8 | 0.281 | 1350 | 2460 |
The steel combines high mechanical strength (typically up to 570
MPa yield strength) and good ductility with outstanding corrosion
resistance in marine environments. The alloy is supplied with a
PREN (Pitting Resistance Equivalent) at >= 40.0 which guarantees
high resistance to pitting corrosion. In addition, the steel offers
high resistance to crevice corrosion and stress corrosion cracking.
Ambient and sub-zero (down to minus 50°C) notch ductility is good.
These attributes mean that this super duplex steel can be used
successfully as an alternative to 300 series stainless steel (such
as type 316), standard 22% Cr duplex steel (such as UNS S31803 /
1.4462 with PREN 33-34) and precipitation hardening stainless
steels (typically 17/4PH).
Applications
