Penn Stainless inventory includes Alloy 304L ( S30403), in sheet, sheet coil, plate, plate coil, round bar, processed flat bar and tubular products. Alloy 304L is ideally suited for home and commercial applications.
Alloy 304L a T-300 series stainless steel austenitic, which has a minimum of 18% chromium and 8% nickel. Type 304L has a carbon maximum is 0.030. It is the standard “18/8 stainless” that is commonly found in pans and cooking tools. Alloys 304L is the most versatile and widely used alloy in the stainless steel family. Ideal for a wide variety of home and commercial applications, Alloys 304L exhibits excellent corrosion resistance and has a high ease of fabrication, outstanding formability. The austenitic stainless steels are also considered to be the most weldable of the high-alloy steels and can be welded by all fusion and resistance welding processes.
Specifications: UNS S30403
Alloy 304L Stainless Steel is used in a wide variety of home and commercial applications, including:
- Food processing equipment, particularly in beer brewing, milk processing, and wine making
- Kitchen benches, sinks, troughs, equipment, and appliances
- Architectural trim and molding
- Automotive and aerospace structural use
- Construction material in large buildings
- Chemical containers, including for transport
- Heat exchangers
- Nuts, bolts, screws, and other fasteners in the marine environment
- Dyeing industry
- Woven or welded screens for mining, quarrying & water filtration
- ASTM/ASME: S30403
- EURONORM: 1.4303
- AFNOR: Z2 CN 18.10
- DIN: X2 CrNi 19 11
- Resistance to corrosion in oxidizing environments is a result of the 18 to 19% chromium that the 304 alloys contain.
- Resistance to moderately aggressive organic acids is a result of the 9 to 11% nickel that the 304 alloys contain.
- At times, alloy 304L may show a lower corrosion rate than the higher carbon Alloy 304; otherwise, the 304, 304L, and 304H may be considered to perform uniformly in most corrosive environments.
- Alloy 304L is preferred for use in environments sufficiently corrosive to cause intergranular corrosion of welds and heat-affected zones on susceptible alloys.
- Good oxidation resistance in intermittent service to 1600°F and in continuous service to 1690°F.
- Continuous use of 304 in the 800-1580°F range is not recommended if subsequent aqueous corrosion resistance is important.
- Grade 304L is more resistant to carbide precipitation and can be heated into the above temperature range.
Properties of 304 Alloy
Excellent welding properties; post-weld annealing is not required when welding thin sections. Two important considerations in producing weld joints in the austenitic stainless steels are:
- preservation of corrosion resistance
- avoidance of cracking
Processing – Hot Forming:
- To forge, heat uniformity to 2100 / 2300 °F
- Do not forge below 1700 °F
- Forging can be air cooled without danger of cracking
Processing – Cold Forming:
- Its austenitic structure allows it to be deep-drawn without intermediate annealing, Making this the stainless steel grade of choice in the manufacturing of sinks, hollow-ware and saucepans.
- These grades work harden rapidly. To relieve stresses produced in severe forming or spinning, parts should be full annealed or stress relief annealed as soon as possible after forming.
- The use of chip breakers is advised since the chips can be stringy. Stainless steel work harden rapidly, heavy positive feeds, sharp tooling, and a rigid set-up should be used.of cut below the work-hardened layer resulting from the previous passes.
||min: 18.0 max: 20.0
||min: 8.0 max: 12.0
||Tensile Strength ksi (min)
||Yield Strength 0.2% ksi (min)
||Hardness (Brinell) MAX
||Hardness (Rockwell B) MAX
(BTU/h ft. °F)
(in x 10-6)
(psi x 106
°F x 10-6
|at 68°F: 0.285
||9.4 at 212°F
||28.3 at 68°F
||9.4 at 32 – 212°F
||0.1200 at 68°F to 212°F
||2500 to 2590
||12.4 at 932 °F
||39.4 at 752°F
||10.2 at 32 – 1000°F
||49.6 at 1652 °F
||10.4 at 32 – 1500°F
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