Austenitic General Service

Austenitic General Service & Wet Corrosion Grades

Common Name UNS # Forms Available C Cr Ni Mo Ti Other Typical Applications
303……………….. S30300 Bars 0.12 18 9 0.2 5S Free machining steel used where extensive machining is required. Corrosion resistance and weldability inferior to 304.
304 S30400 Sheet, Coil, Plate, Bars, Welded & Seamless Pipe & Tube 0.05 18.5 8.5 General purpose steel with good corrosion resistance for most applications. Used for architecture, food processing, domestic sinks and tubs and deep drawing applications.
304L S30403 Sheet, Coil, Plate, Bars, Welded & Seamless Pipe & Tube 0.025 18.5 9 Chemical plant and food processing equipment, where freedom from sensitisation is required in plate.
316 S31600 Sheet, Coil, Plate, Bars, Welded & Seamless Pipe & Tube 0.05 17 11 2.1 Used where higher corrosion resistance is required, i.e. Marine equipment. Can be welded up to 3mm without subsequent heat treatment.
316L S31603 Sheet, Coil, Plate, Bars, Welded & Seamless Pipe & Tube 0.02 17 11 2.1 A low carbon modification of 316 where heavy
section weldments are required without the risk
of intergranular corrosion.
316Ti S31635 Plate, Pipe & Tube 0.05 17 11 2.1 0.5 A titanium stabilised version of 316 used where good resistance to intergranular corrosion and high temperature strength is required.
317 S31700 Sheet, Coil & Plate 0.07 19 13 3.25 For chemical plant – has a greater corrosion resistance than 316 in certain applications, notably in contact with brines and halogen salts. Also available in a low carbon “L” grade.
904L N08904 Sheet, Plate, Bar, Pipe & Tube 0.02 20 25 4.5 1.5cU High resistance to: general corrosion in e.g. Sulphuric and acetic acids; crevice corrosion; stress corrosion cracking; pitting in chloride beading solutions. Good weldability.
254SMO S31254 Sheet, Plate, Bar, Pipe & Tube 0.02 20 18 6 0.2N Used where high resistance to chloride pitting and crevice corrosion is required, e.g. Seawater heat exchangers, bleach vats and washers in the pulp and paper industry.

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