FERRALIUM 255, SUPER DUPLEX, ALLOY 255, S32550, URANUS 52N+ (AUSTENITIC-FERRITIC) Cr-Ni-Mo-Cu-N STAINLESS STEEL

Description

Alloy 255 is a 25% chromium duplex ferritic-austenitic stainless steel designed to provide a superior combination of high strength and excellent corrosion resistance for a wide variety of applications. The alloy possesses a microstructure which is a balanced mixture of austenite and ferrite. The combination of these phases develops the unique combination of strength and chloride stress-corrosion cracking resistance of this alloy. The alloy finds applications in marine corrosion areas, equipment for phosphoric acid and fertilizer industry, pollutions control equipment, the pulp and paper industry and the petrochemical industry.

URANUS® 52N+ (UR 52N+) is a super duplex stainless steel with 25% Cr and a PREN value higher than 40. The minimum guaranteed yield strength is 550 MPa which allows the designer to reduce weight. The molybdenum and nitrogen additions have been optimized in order to obtain the best corrosion resistance properties even for heavy plates. High nitrogen content improves the structure stability particularly in HAZ. Its corrosion resistance is much better than UR B6/N08904 and roughly equivalent to 6 Mo super austenitic alloys. Copper additions increase the corrosion resistance properties, particularly in sulfuric acid media. URANUS® 52N+ is a cost efficient grade designed for offshore, marine, phosphoric acid, sulfuric acid applications... as well as pollution control equipments.

Applications

Applications include chemical process equipment in which chlorides or phosphoric acid are encountered. The good erosion resistance of the alloy also make it suitable for pumps and valves handling hot slurries that may be abrasive as well as corrosive.

Specifications

UNS# S32550, FERRALIUM 255, DUPLEX, ALLOY 255, URANUS 52N+ (AUSTENITIC-FERRITIC) Cr-Ni-Mo-Cu-N STAINLESS STEEL
ASTM A-182 FORGED OR ROLLED ALLOY-STEEL PIPE FLANGES, FORGED FITTINGS & VALVES & PARTS FOR HIGH-TEMP SERVICE
ASTM A-240 PLATE, SHEET & STRIP FOR PRESSURE VESSELS
ASTM A-479 BARS & SHAPES FOR BOILERS & PRESSURE VESSELS
ASTM A-789 SEAMLESS & WELDED TUBING FOR GENERAL SERVICE
ASTM A-790 SEAMLESS & WELDED PIPE

Available Forms

• Bar
• Coil
• Forge
• Pipe
• Plate
• Sheet
• Tubes
• Wire