AISI303 material datasheet


AISI 303 (SUS 303) Grade Stainless Steel

Stainless steel type 1.4305 is popularly known as grade 303 stainless steel. Grade 303 is the most readily machineable of all the austenitic grades of stainless steel.
 
The machineable nature of grade 303 is due to the presence of Sulphur in the steel composition. Whilst the Sulphur improves machining, it also causes a decrease in the corrosion resistance and a slight lowering of the toughness.

 

Chemical and physical properties

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

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.

 

* Citing source: Wikipedia

  

Chemical resistance chart

How to use this chart

» Meaning of symbol:

OK: Recommend

△: Must confirm if usable by testing advanced. 

X: Not recommend

» This chart only provide result of single chemical to material, if client use more than one kinds of chemical in the same time, please choose material by experience.

» This chart is for reference which not able to be applicable to all environment. Please design equipment according to practical experience.

 

Catagory Chemical AISI303
Organic acids Acetic acid OK
Acetic anhydride OK
Organic compound
 Acetaldehyde OK
 Acetone OK
Alcohol:methyl
OK
Aniline
OK
Benzaldehyde
OK
Ethanol
OK
Ethylene glycol
OK
Formaldehyde

Formic acid
OK
Lactic acid
OK
Methanol
OK
 Phenol OK
Propane,liq
OK
 Propanol OK
 Toluene OK
Inorganic compound Ammonia
OK
Ammonium hydroxide
OK
Barium chloride
OK
Barium hydroxide
OK
Calcium Chloride
OK
Chlorine △ (wet)
Detergent
OK
Hydrofluoric acid  X (50%)
Hydrogen peroxide
OK (30%)
Nitric acid
OK (10%) OK (concentrated)
Phosphoric acid
OK (10%) OK (concentrated)
Potassium hydroxide
OK (50%)
Potassium nitrate

Potassium sulfate
OK
Sodium carbonate
OK
Sodium hydroxide
OK
Sulfuric acid
OK (concentrated)
Sulfur dioxide
OK (liquid)

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