Stainless Steel 321 (AMS 5510 / AMS 5645)

Technical Data Sheet


Chemical Composition Limits
Weight% C Si Mn P+S Cr Ni Ti N Fe Mo
AMS 5510
Alloy 321
0.08 max 0.25-1.00 2.0 max 0.040P
17-19 9-12 0.7 max 0.1 max Bal 0.75

Type 321 is a chromium-nickel stainless steel and with the addition of titanium, type 321 is resistant to intergranular corrosion. Type 321's general corrosion is less than Type 302.  Type 321 is used where resistance to intergranular corrosion is required and where the parts are subjected to sustained heating or cooling within the range of 800 to 1500ºF. Type 321 is commonly used in applications such as exhaust stacks, manifolds and ring collectors

Typical Mechanical Properties


Material Condition Tensile Strength (ksi) Yield Strength (ksi)
% Elongation Hardness HB
Alloy 321
AMS 5510
AMS 5510 Sheet (Sol Trtd) 70-100 25 40 -
Alloy 321
AMS 5645
AMS 5645 Bar (Sol Trtd) - - - 255 max

Type 321 is available in Sheet, Strip, Plate, Bar (Round, Hex, Flat, Square), Tube and Forging Stock. 321 Foil (Shim) is available in various thicknesses. View stock list for further information. Foil Stock List, Sheet Stock List , Plate Stock List for all availability contact Sales.

AMS 5510 Sheet / strip / plate
AMS 5557 Welded/seamless tube
AMS 5559 Welded / thin wall tube
AMS 5570 Seamless tube
AMS 5576 Welded tube
AMS 5645 Bars / wire / forging
MIL-T-8606 Seamless tube
MIL-T-8606 Welded tube
MIL-T-8808 Seamless tube
MIL-T-8808 Welded tube
ASTM A240 / ASME SA240
ASTM A167 / ASME SA167
ASTM A193 Grade B8T CL1
ASTM A276 / ASME SA276
ASTM A314 / ASME SA314
ASTM A320 Grade B8T
ASTM A479 / ASME A479
ASTM A484 / ASME SA484
AISI 321
BS 2S129
BS T67 Tube
BS S524 Sheet
BS S526 Sheet
BS 970; 321S31
WS 1.4541
UNS S32100

Every effort is made to ensure that technical specifications are accurate. However, technical specifications included herein should be used as a guideline only. All specifications are subject to change without notice.