SUS304, SUS304L Stainless Steel

in stock

 

We are the Stainless Steel 304 and 304L supplier Malaysia.

SUS304 is the standard “18/8” stainless; it is the most versatile and most widely used stainless steel, while Grade 304L, the low carbon version of 304, does not require post-weld annealing and so is extensively used in heavy gauge components

 

Leading Supplier of Stainless Steel SUS304 

Stainless Steel 304 / 304L also equivalent to 
  • UNS S30400

 

Properties of SUS304 Stainless Steel

Grade 304 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 Grade 304 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 readily brakes or roll-formed into a variety of components for applications in the industrial, architectural, and transportation fields. Grade 304 also has outstanding welding characteristics. Post-weld annealing is not required when welding thin sections.

Grade 304L, the low carbon version of 304, does not require post-weld annealing and so is extensively used in heavy gauge components (over about 6mm).

Grade 304H with its higher carbon content finds application at elevated temperatures. The austenitic structure also gives these grades excellent toughness, even down to cryogenic temperatures.

 

Comparison between SUS304 & SUS304L 

Chemical Composition of both Stainless Steel :

GradeCMnSiPSCrMoNiN
304min.-----18.0-8.0-
max0.082.00.750.0450.03020.010.50.10
304Lmin. -----18.0-8.0-
max.0.0302.00.750.0450.03020.012.00.10

 

Mechanical Properties of both Stainless Steel : 

GradeTensile Strength (MPa) minYield Strength 0.2% Proof (MPa) minElongation (% in 50mm) minHardnessHardness
Rockwell B (HR B) maxBrinell (HB) max
SS3045152054092201
SS304L4851704092201

 

Physical Properties :

GradeDensity (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°C0-315°C0-538°Cat 100°Cat 500°C
304/L/H800019317.217.818.416.221.5500720

 

Corrosion Resistance 

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 

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 

It is common for 304 and 304L to be stocked in “Dual Certified” form, particularly in plate and pipe. These items have chemical and mechanical properties complying with both 304 and 304L specifications. Such dual certified product does not meet 304H specifications and may be unacceptable for high-temperature applications.

 

Technical Applications

  • 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
  • Springs
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