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316/316L

Chemical Composition %

C Cr Mn Mo Ni P S Si
Max Max Max Max Max
0.035 16.0-20.0 2.00 2.0-3.0 10.0-15.0 0.040 0.030 0.75

Availability

Specifications

  • ASTM
  • A312, A376, A358, A269 A249, A403, A182, A351 A479, A276
  • ASME
  • SA312, SA376, SA358, SA269, SA249, SA182, SA276, SA403, SA479, SA351

Description

Type 316 is a molybdenum steel possessing improved resistance to pitting by solutions containing chlorides and other halides. In addition, it provides excellent elevated temperature tensile, creep and stress – rupture strengths.

Design Features

  • Type 316 is more resistant to atmospheric and other mild environments than Type 304. It is resistant to dilute solutions (i.e. 1-5%) of sulfuric acid up to 120 deg.F. However, in certain oxidizing acids, Type 316 is less resistant than Type 304.
  • 316 is susceptible to carbide precipitation when exposed in the temperature range of 800 deg. – 1500 deg.F. and therefore is susceptible to intergranular corrosion in the as-welded condition.
  • Annealing after welding will restore corrosion resistance.
  • Type 316L has the same composition as Type 316 except the carbon content is held below 0.03%. Not unexpectedly, its general corrosion resistance and other properties closely correspond to those of Type 316. However, it does provide immunity to intergranular attack in the as-welded condition or with short periods of exposure in the temperature range of 800 deg. – 1500 deg.F. The use of 316L is recommended when exposure in the carbide precipitation range is unavoidable and where annealing after welding is not practical. However, prolonged exposure in this range may embrittle the material and make it susceptible to intergranular attack.
  • The maximum temperature for scaling resistance in continuous service is about 1650 deg. F. and 1500 deg.F. for intermittent service.
  • May be susceptible to chloride stress corrosion cracking.
  • Non-hardenable; non-magnetic in the annealed condition, and slightly magnetic when cold worked.
  • Improved corrosion resistance to chlorides.

Typical Applications

  • Nuclear, chemical processing, Rubber, plastics, pulp/paper, pharmaceutical and textile industries, heat exchangers, condensers and evaporators

Tensile Requirements

  • Tensile Strength (KSI) 70
  • Yield Strength (KSI) 25
  • KSI can be converted to MPA (Megapascals) by multiplying by 6.895.