Vessco Overseas

Alloys 254 / 254 SMO / 6 Mo is an austenitic stainless steel with a high molybdenum content. Coupled with Nickel and Copper this gives the alloy a good resistance to pitting and crevice corrosion, especially in environments containing halide ions, e.g. chloride, bromide and fluoride solutions.254 SMO (UNS S31254) may offer a cost effective solution to Nickel and Titanium alloys in these environments.

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• 0.2% Proof Stress (N/mm2 )[ksi] minimum: 300 [43.5]
• Ultimate Tensile Strength (N/mm2) [ksi] minimum: 650[94.2]
• Elongation (%) minimum: 35
• Hardness (HBN): 270 max
• Reduction of Area(%) minimum: 50

Applications of Alloy 254:

• Chemical Process Industry: Urea Production, Organic and Fatty Acids, High halide concentrations 
• Marine Industry and Shipbuilding: Piping, Pumps, Valves, Heat exchangers 
• Oil and Gas Industry: Heat exchangers, Piping, Valves, Pumps 
• Pulp and Paper Industry: Bleach plant, vats, drums, press rolls, piping 
• Power Industry: Flue gas scrubbers 
• Desalination plant: Piping, Condensers

Alloy 254 Features:

• High strength compared to 316L and 317L austenitic stainless steels
• Excellent ductility and impact strength at both ambient and sub-zero temperatures
• Non-magnetic
• Higher resistance to abrasion, erosion and cavitation erosion than 316 and 317 stainless
• Listed in MR-01-75 for sour service oilfield applications

KEY Features of Alloy 254:

• Resistant to crevice corrosion in seawater
• Excellent corrosion resistance in seawater and concentrated halide environments
• High resistance to stress corrosion cracking 
• Good resistance to erosion corrosion
• Excellent ductility and impact strength at both ambient and sub-zero temperatures
• Low magnetic permeability

Nimonic Alloy 75 (UNS N06075) is a nickel-chromium alloy with good mechanical properties and oxidation resistance at high temperatures. Alloy 75 is most commonly used for sheet metal fabrications which require oxidation and scaling resistance together with medium strength at high operating temperatures. Alloy 75 is also used in gas turbine engines, for components of industrial furnaces, for heat treating equipment and fixtures, and in nuclear engineering.

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Standards:

• Rod, Bar, Wire and Forging Stock: BS HR 5, BS HR 504, DIN 17752, AECMA PrEN2306, AECMA PrEN2307, AECMA PrEN2306, AECMA Pr EN2307, AECMA PrEN2402, ISO 9723, ISO 9724, ISO 9725
• Plate, Sheet, Strip: BS HR 203, DIN 17750, AECMA PrEN2293, AECMA PrEN2302, AECMA PrEN2411, ISO 6208
• Other: DIN 17742, AECMA PrEN2308, Werkstoff Nr 2.4630, W. Nr 2.4951, UNS N06075, Nimonic 75 (tradename), MSRR 7104 and MSRR 7004, AFNOR NC 20T

Alloy 80A is a nickel-chromium alloy similar to alloy 75 but made precipitation hardenable by additions of aluminium and titanium. Alloy 80A has good corrosion and oxidation resistance and high tensile and creep-rupture properties at temperatures to 815ºC (1500ºF). Alloy 80a is used for gas-turbine components (blades, rings, discs), bolts, tube supports in nuclear generators, exhaust valves in internal combustion engines and has many other offshore/marine, automotive and electrical applications.

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