303 Grade Stainless Steel Plate

Gnee Stainless inventory includes 303 grade stainless steel (UNS S30300) in plate, round bar, square bar, hex bar, and rolled flat bar.

A non-magnetic, austenitic stainless steel that is not hardenable by heat treatment, 303 stainless steel plate offers good weather resistance, toughness and forming properties. 303 SS is a free-machining, austenitic stainless steel that is used primarily for parts requiring machining, grinding or polishing. Comprised of chromium, nickel, stainless steel and other alloys, this material type is designed to exhibit improved machinability while maintaining strong mechanical and anti-corrosion properties. The additional sulfur present in 303 assists in breaking up turnings which reduce drag on the cutting tool. This alloy offers good corrosion resistance in mild environments and good forming properties.

STANDARDS –- ALLOY 303 ASTM/ASME ,UNS S30300

EURONORM--FeMi35Cr20Cu4Mo2

DIN--2.4660

RESISTANCE CORROSION RESISTANCE Good resistance to mildly corrosive atmospheres, but significantly less than Alloy 304

When additional sulfur is added to improve machinability, it can often slightly reduce corrosion resistance

In most dry and mild corrosive environments, Alloy 303 is comparable to other unmodified alloys

Should not be exposed to moist, marine environments as it is subject to rapid-pitting corrosion and a rust film will tend to form

Like other common austenitic stainless steels, it is subject to corrosion cracking in chloride environments above 60oC

HEAT RESISTANCE Good oxidation resistance at temperatures up to 1700oF (927 oC)

Continuous use at temperatures above 1400oF (760oC) is not usually recommended due to carbide precipitation which can lead to irregular scaling

Does not have a low carbon content so it is also vulnerable to sensitisation

PROCESSING WELDING CHARACTERISTICS Not generally recommended, but may be welded with some difficulty

May be welded with Alloy 310 electrodes

Should be annealed after welding to re-dissolve precipitated carbides

MACHINABILITY High machining rates can be obtained in the annealed condition with hardness in the range of 200 to 240 Brinell

Will work harden, therefore, it should be machined at reduced surface feet per minute and heavier feeds to prevent glazing at the tool interface.

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