SS 303 , UNS S30300, 1.4305, sus 303
sus 303 Chemical Composition
Fe, <0.15% C, 17-19% Cr, 8-10% Ni, <2% Mn, <1% Si, <0.2% P, >0.15%S
What is sus303 material?
sus303 represents the optimum in machinability among the austenitic stainless steels. It is primarily used when production involves extensive machining in automatic screw machines.
The sulphur addition which is responsible for the improved machining and galling characteristics of SS 303 lowers its corrosion resistance to below that of SS 304. As for other austenitic grades the structure gives sus303 excellent toughness, although the sulphur in sus303 reduces its toughness slightly.
Physical Properties ss303
Possible Alternative Grades
303 stainless steel corrosion resistance?
Good resistance to mildly corrosive atmospheres, but significantly less than sus 304 due to the sulphur addition; the sulphide inclusions act as pit initiation sites. sus 303 should not be exposed to marine or other similar environments, as these will result in rapid pitting corrosion. Because the sulphide inclusions in sus303 are primarily aligned along the rolling direction the corrosion resistance is particularly reduced in cross-sections.
Stainless steel 303, like other common austenitic stainless steels, is subject to stress corrosion cracking in chloride containing environments above about 60°C.
Heat Resistance of SS303
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 – ss303 usually does not have a low carbon content so is susceptible to sensitisation.
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303 stainless steel heat treatable?
Solution Treatment (Annealing) – Heat to 1010-1120°C and cool rapidly. This grade cannot be hardened by thermal treatment.
Welding of Stainless steel 303
Not generally recommended but, if unavoidable and a lower strength can be tolerated, use Ss 308L or SS 309 electrodes. AS 1554.6 does not pre-qualify welding of SS 303. Welds must be annealed for maximum corrosion resistance.
What is the difference between 303 and 304 and 316 stainless steel?
SUS303 is a free-machining grade of 304 stainless steel that contains added sulphur or selenium. The addition of sulphur or selenium increases the machinability. Its composition contains at minimum 17% Chromium, 8% nickel, and 0.15% Sulphur/Selenium.
sus304 contains a minimum of 18% chromium and 8% nickel which gives its alternate name 18/8 stainless steel. 304 stainless steel contains chromium-nickel content and low carbon.
sus316 Contains a minimum of 16% chromium, 10% nickel and 2% molybdenum. The main difference between 304 and 316 stainless steel is the fact that 316 stainless contains a significantly increased amount of molybdenum. This increase in molybdenum results in increased corrosion resistance.
What is the difference between SS 202 and ss304?
The major differences between 202 and 304 stainless steels are in the nickel and chromium contents. 202 has 16-18% chromium and 0.5-4.0% nickel, whilst 304 has 18-20% chromium and 8-10.5% nickel. Both are austenitic steels and are essentially non-magnetic, but will become temporarily magnetic by working them.