SUS303  steel
Stainless Steel SUS303
SUS303 equal materiel :
S30300 , AISI 303,X10CrNiS18-9, Material number 1.4305
SUS303 is one of the most popular of all the free machining stainless steels. SUS303 offers good strength, corrosion resistance and great machinability. It will resist scaling at temperatures up to 1600 F(871 C).SUS303 is stocked primarily in Bar Products and also available to a lesser extent in Flat Rolled Products, Wire Products, Fasteners, Casting Products, Structural, Tubular Products, Forging Products, Piping Components, and Shapes.
SUS303 Corrosion Resistance :
Good resistance to mildly corrosive atmospheres, but significantly less than Grade 304 due to the sulphur addition; the sulphide inclusions act as pit initiation sites. Grade 303 should not be exposed to marine or other similar environments, as these will result in rapid pitting corrosion. Because the sulphide inclusions in 303 are primarily aligned along the rolling direction the corrosion resistance is particularly reduced in cross-sections.
SUS303 like other common austenitic stainless steels, is subject to stress corrosion cracking in chloride containing environments above about 60°C.
SUS303 Heat Resistance :
Good oxidation resistance in intermittent service to 760°C and in continuous service to 870°C. Continuous use in 425-860°C range not usually recommended due to carbide precipitation - 303 usually does not have a low carbon content so is susceptible to sensitisation.
SUS303 Fabrication :
As well as reducing the corrosion resistance, the sulphur additions in 303 also result in poor weldability and reduced formability compared to Grade 304. Sharp bends should not be attempted in 303. A practical compromise alternative may be a 304 Ugima Improved Machinability grade - this does not machine as readily as 303, but does offer better formability (as well as better weldability and corrosion resistance).
SUS303 Heat Treatment :
Solution Treatment (Annealing) - Heat to 1010-1120°C and cool rapidly. This grade cannot be hardened by thermal treatment.
SUS303 Welding :
Not generally recommended but, if unavoidable and a lower strength can be tolerated, useGrade 308L or 309 electrodes. AS 1554.6 does not pre-qualify welding of 303. Welds must be annealed for maximum corrosion resistance.
SUS303 Machining :
A "Ugima" improved machinability version of grade 303 is available in round bar products. This machines significantly better even than standard 303, giving very high machining rates and lower tool wear in many operations.
SUS303 application :
SUS303 is used in an incredibly wide variety of parts both in screw and general machining industries. Applications include hardware, fasteners, valve parts, nozzles and trim.
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