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Elements (Max.) C Mn P S Si Cr Ni Mo .03 2.00 .045 .03 .75 16/18 10/14 2/3
Type 316L is a very low carbon grade with general corrosion resistance similar to Type 316, but with superior resistance to intergranular corrosion during welding or stress relieving. This precludes any harmful carbide precipitation in the 800 to 1500 Deg. F range, such as might otherwise occur in welding heavy sections.
Applications: Same as those for Type 316. All other physical characteristics and applications are similar or equivalent to regular Type 316. Type 321 Stainless Steel
Elements (Max.) C Mn P S Si Cr Ni Ti .08 2.00 .045 .03 .75 17/19 9/12 5X(C+N) Min./.070 Max.
Type 321 is chromium-nickel stainless steel modified by the addition of titanium to overcome the danger of intergranular corrosion 'common to other austenitic stainless steels during or after exposure to temperatures of 800 to 15O0 Deg. F This type is-non-magnetic in the annealed condition and not hardenable by heat treatment.
Applications: Used where freedom from intecgranular corrosion is desired and milder corrosive conditions exist. It is used in parts subjected to sustained heating in or slow cooling through the range of 800 to 15O0 Deg. F It is well suited for cold drawing and forming operations. In the aircraft industry it is used particularly for such applications as exhaust stacks, manifolds and ring collectors.
Corrosion Resistance: Type 321 is resistant to intergranular corrosion. fts general corrosion resistance is somewhat less than that of Type 302. It tends to form a light rust film in corrosive atmospheres', but this rusting is not progressive.
Resistance To Scaling: Excellent scale resistance at temperatures up to 1650 Deg. F in continuous service.
Machinability: Type 321 has a machinability rating of approximately 36%, with B-1112 rated 100%. Surface cutting speed on automatic screw machines is approximately 60 feet per minute.
Weldability: Easily welded by all the commercial processes except forge or hammer welding.
Forming: This grade has good forming and stamping properties.
Forging: Forge between 2100 and 2300 Deg. F Do not forge below 1800 Deg. F.
Annealing: Annealing range is between 1850 and 2050 Deg. F. Cool rapidly Water should be used for heavier sections air for lighter sections. The stress relieving range is 400-750 Deg. F.