Leading Supplier of Stainless Steel 304
Specifications of Grade 304 Stainless Steel / Grade 304L Stainless Steel also equivalent to
SUS304 | SUS304L | UNS S30400
Properties of SUS304 Stainless Steel
SUS304 is the standard “18/8” stainless; it is the most versatile and most widely used stainless steel, available in a wider range of products, forms and finishes than any other. It has excellent forming and welding characteristics. The balanced austenitic structure of Stainless Steel Grade 304 (SUS304) enables it to be severely deep drawn without intermediate annealing, which has made this grade dominant in the manufacture of drawn stainless parts such as sinks, hollow-ware and saucepans.
For these applications it is common to use special “304DDQ” (Deep Drawing Quality) variants. Grade 304 (SUS304) is readily brake or roll formed into a variety of components for applications in the industrial, architectural, and transportation fields. SUS304 also has outstanding welding characteristics. Post-weld annealing is not required when welding thin sections.
Grade 304L Stainless Steel (SUS304L), the low carbon version of SUS304, does not require post-weld annealing and so is extensively used in heavy gauge components (over about 6mm). Grade 304H Stainless Steel (SUS304H) with its higher carbon content finds application at elevated temperatures. The austenitic structure also gives these grades excellent toughness, even down to cryogenic temperatures.
Corrosion Resistance of SUS 304 Stainless Steel
Excellent in a wide range of atmospheric environments and many corrosive media. Subject to pitting and crevice corrosion in warm chloride environments, and to stress corrosion cracking above about 60°C. Considered resistant to potable water with up to about 200mg/L chlorides at ambient temperatures, reducing to about 150mg/L at 60°C.
Heat Resistance of UNS S30400 Stainless Steel
Good oxidation resistance in intermittent service to 870°C and in continuous service to 925°C. Continuous use of 304 in the 425-860°C 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.
Grade 304H has higher strength at elevated temperatures so is often used for structural and pressure-containing applications at temperatures above about 500°C and up to about 800°C. 304H will become sensitised in the temperature range of 425-860°C; this is not a problem for high-temperature applications but will result in reduced aqueous corrosion resistance.
Dual Certification of SS 304 and SS 304L Stainless Steel
It is common for Grade 304 (SUS304) and Grade 304L (SUS304L) to be stocked in “Dual Certified” form, particularly in plate and pipe. These items have chemical and mechanical properties complying with both SS304 and SS304L specifications. Such dual certified product does not meet SUS304H specifications and may be unacceptable for high-temperature applications.
Comparison between SUS304 & SUS304L
Chemical Composition of SUS 304 & SUS 304L :
Mechanical Properties of SS304 & SS304L :
|Grade||Tensile Strength (MPa) min||Yield Strength 0.2% Proof (MPa) min||Elongation (% in 50mm) min||Hardness||Hardness|
|Rockwell B (HR B) max||Brinell (HB) max|
Physical Properties of Stainless Steel Type 304 & Type 304L :
|Grade||Density (kg/m3)||Elastic Modulus (GPa)||Mean Coefficient of Thermal Expansion (μm/m/°C)||Thermal Conductivity (W/m.K)||Specific Heat 0-100°C (J/kg.K)||Electrical Resistivity (nΩ.m)|
|0-100°C||0-315°C||0-538°C||at 100°C||at 500°C|
Technical Applications of Stainless Steel Grade 304
- Food processing equipment, particularly in beer brewing, milk processing & winemaking.
- Kitchen benches, sinks, troughs, equipment and appliances
- Architectural panelling, railings & trim
- Chemical containers, including for transport
- Heat Exchangers
- Woven or welded screens for mining, quarrying & water filtration
- Threaded fasteners
Our Sales and Supplier Network in SUS304 / SUS304L / 304 Stainless Steel :
With over many years of experience and strong global sourcing networking in the market, we are proud to be the SS304 and SS304L Stainless Steel Supplier and Exporter to :
- Australia, Pakistan, Malaysia, Singapore, Taiwan, China, Vietnam, Belgium, Japan, South Korea, Philippines, France, United Kingdom, Indonesia, Thailand, Hong Kong, China, Sweden, United States, Dubai, Finland, Brunei, Germany.
Besides, we have the full range of Stainless Steel sheets, Stainless Steel Round Bar, Stainless Steel Rods, Stainless Steel Plate which consists of
– 300 Series Stainless Steel : SUS304, SUS304L, SUS309, SUS310, SUS316Ti, SUS317, SUS321, SUS347
– 400 Series Stainless Steel : SUS403, SUS410, SUS420, SUS431, SUS440C, SUS630, SUS904L
– Nitronic 30, Nitronic 50, Nitronic 60
– Super Duplex S32750, S32760