SUS303 Stainless Steel | SUS303 | SS303
SUS303 Stainless Steel | SUS303 | SS303  Stainless Steel Malaysia, Selangor, Kuala Lumpur (KL), Klang Supplier, Suppliers, Supply, Supplies | E STEEL SDN. BHD. Stainless Steel 303 , SUS303 , SS303 , AISI 303 Plates Suppliers
We are the Leading Supplier of Stainless Steel SUS303.  
Stainless Steel 303 (SS303) is the most readily machineable of all the austensitic grades of stainless steel.  

We supply and export to Singapore , Indonesia , Brunei and other ASEAN Countries.  

Our specialty is to provide wide range of stainless steel
 with no minimum order (MOQ).

E Steel supply Stainless Steel 303 (SUS303, SS303) Round Bars , Stainless Steel 303CU (SUS303CU, SUS303CU) Round Bars and Rods , SUS303 Hexagon Bars , SUS303 Plates. 

Stainless Steel SUS303 Suppliers - SUS303 , SS303 , UNS S30300 , DIN 1.4305 

Stainless Steel SUS303 is also known as Stainless Steel Type 1.4305.  SUS303 is the most readily machineable of all the austensitic grades of stainless steel.  

The machineable nature of Grade 303 stainless steel is due to the presence of Sulphur in the steels composition. Whilst the Sulphur improves machining, it also causes a decrease in the corrosion resistance and a slight lowering of the toughness. The corrosion resistance of grade 303 stainless steel is lower than that for 304. The toughness is still excellent as with other austenitic grades.

Property data given in this document is typical for bar products covered by EN 10088-3:2005. ASTM, or other standards may cover products sold. It is reasonable to expect specifications in these standards to be similar but not necessarily identical to those given in this datasheet.

Chemical Composition (%) of SUS303 Stainless Steel

% SS 303
C 0 - 0.10 
Mn 0 - 2.0
Si 0 - 1.0
P 0 - 0.4
S 0 - 0.15
Cr 17 - 19
Ni 8 - 10
Fe Balance 

Mechanical Properties of Stainless Steel SS303 

Grade SUS 303 
Tensile Strength (MPa)  500-750 MPa
Proof Stress (MPa)  190 Min MPa
Elongation A5 mm 35 Min % 
Hardness Brinell  230 Max HB 


Similar Specifications of SUS303 Stainless Steel 

  • DIN 1.4305 
  • UNS S30300
  • BS 303S31
  • EN 58M
  • Grade 303 

Corrosion Resistance of Stainless Steel SS303 

Sulphur additions to the composition act as initiation sites for pitting corrosion. This decreases the corrosion resistance of grade 303 stainless steel to less than that for 304. However corrosion resistance remains good in mild environments.
In chloride containing environments over 60°C, grade 303 stainless steel is subject to pitting and crevice corrosion. Grade 303 stainless is not suitable for use in marine environments.

Heat Resistance of Stainless Steel SUS303 

Grade 303 stainless steel has good resistance to oxidation when intermittently exposed to temperature up to 760°C temperatures. It also has good oxidation resistance in continuous service to 870°C. This, however, is not recommended as 303 is sensitive to carbide precipitation with continuous use at 425-860°C.

Applications of Stainless Steel S30300 (SS303) 

Material Grade 303 stainless steel is used in applications that require parts to be heavily machined. These applications include:
  • Nuts and bolts
  • Screws
  • Gears
  • Aircraft fittings
  • Bushings
  • Shafts
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