Material - Stainless Steel 316 / 316L

SS316 is an alloy of chromium – nickel with molybdenum which improves the corrosion resistance properties. The molybdenum in the material also elevates its strength. SS 316 / 316L both have almost the same corrosion resistance properties, the only difference is SS 316L has a low carbon stainless steel content.

SS 316 / 316L has excellent corrosion resistance to:

  • Most organic acid systems like acetic, formic, etc.
  • Ammonia & most ammonia compounds
  • Many salts except chlorides
  • Most commercial gases at moderate temperature & pressures
  • Hydrogen chloride, fluoride & chloride in scrupulously anhydrous systems

 

SS316 / 316L has poor resistance to:

  • Organic halides
  • Dilute sulfuric, phosphoric & nitric acids at high temperatures & pressures
  • Halogen acids at low temperatures & in dilute forms
  • Caustics, halogen salts, chlorides, etc.

 

Applications of SS 316 / 316L is mainly in chemical & petrochemical industry, food processing, pharmaceutical equipment, & also in marine & architectural applications.

Chemical Composition:

Element Percentage
Iron ( Fe ) 60% - 67%
Nickel ( Ni ) 9% - 12%
Chromium ( Cr ) 18% - 21%
Molybdenum ( Mo ) 2% - 3%
Carbon ( C ) 0.08%
Other:
Silicon ( Si ) 2%
Manganese ( Mn ) 1.5%

Corrosion Rating:

RATINGS - 0:Unsuitable 1:Poor to Fair 2:Fair 3:Fair to good 4:Good 5:Good to Excellent 6:Normally Excellent

Materials Non-oxidizing or reducing media Liquids Gases
Acid solutions excluding Hydrochloric, phosphoric, sulfuric Neutral solutions, e.g. many Non-oxidizing salt solutions, chlorides, sulfates Alkaline solutions Oxidizing Media Halogen & derivatives
Caustic & mild alkalis, excluding ammonium hydroxide Ammonium hydroxide & amines Acid solutions, e.g. nitric Neutral or alkaline solutions e.g. per sulfates, peroxides, chromates Pitting media, acid ferric chloride solutions Halogen Hydrogen halides, dry, e.g., dry, hydrogen chloride
Moist, e.g. chlorine below dew point Dry, e.g. fluorine above dew point
SS 316 4 5 5 6 5 6 1 0 3 2

Note: Maximum Design Temperature shall depend on the corresponding pressure requirement.

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