321 Stainless Steel Tube
Description
GENERAL PROPERTIES
Type 321 is a stabilized stainless steel which offers as its main advantage an excellent resistance to intergranular
corrosion following exposure to temperatures in the chromium carbide precipitation range from 800 to 1500° F (427 to 816° C).
Type 321 is stabilized against chromium carbide formation by the addition of titanium.
While Type 321 continues to be employed for prolonged service in the 800 to 1500° F (427 to 816° C) temperature range, Type 304L has supplanted this stabilized grade for applications involving only welding or short time heating.
Type 321 stainless steel s also advantageous for high temperature service because of its good mechanical properties. Type 321 stainless steel offers higher creep and stress rupture properties than Type 304 and, particularly, Type 304L which might also be considered for exposures where sensitization and intergranular corrosion are concerns. This results in higher elevated temperature allowable stresses for this stabilized alloy for ASME Boiler and pressure Vessel Code applications. The Type 321 alloy has a maximum use temperature of 1500°F (816° C) for code applications like Type 304, whereas Type 304L is limited to 800° F (426° C).
PHYSICAL PROPERTIES
MECHANICAL PROPERTIES
All values specified are approximate minimums unless otherwise specified. Values are derived from the applicable AMS and ASTM specifications.
CHEMICAL PROPERTIES
All values are maximum values unless otherwise specified. Values are derived from applicable AMS and ASTM specifications.
Type 321 is a stabilized stainless steel which offers as its main advantage an excellent resistance to intergranular
corrosion following exposure to temperatures in the chromium carbide precipitation range from 800 to 1500° F (427 to 816° C).
Type 321 is stabilized against chromium carbide formation by the addition of titanium.
While Type 321 continues to be employed for prolonged service in the 800 to 1500° F (427 to 816° C) temperature range, Type 304L has supplanted this stabilized grade for applications involving only welding or short time heating.
Type 321 stainless steel s also advantageous for high temperature service because of its good mechanical properties. Type 321 stainless steel offers higher creep and stress rupture properties than Type 304 and, particularly, Type 304L which might also be considered for exposures where sensitization and intergranular corrosion are concerns. This results in higher elevated temperature allowable stresses for this stabilized alloy for ASME Boiler and pressure Vessel Code applications. The Type 321 alloy has a maximum use temperature of 1500°F (816° C) for code applications like Type 304, whereas Type 304L is limited to 800° F (426° C).
PHYSICAL PROPERTIES
|
Melting Point |
Density |
Specific Gravity |
Modulus of Elasticity in Tension |
|
2550-2635° F |
.286 lb/in³ |
7.93 |
28 X 106 psi |
MECHANICAL PROPERTIES
|
Grade |
Temper |
Tensile Strength Minimum (psi) |
Yield Strength Minimum 0.2% offset (psi) |
% Elongation in 2" Minimum |
Notes |
|
321 |
Annealed |
75,000 |
30,000 |
40 % |
- |
All values specified are approximate minimums unless otherwise specified. Values are derived from the applicable AMS and ASTM specifications.
CHEMICAL PROPERTIES
|
Grade |
C |
Mn |
P |
S |
Si |
Cr |
Ni |
Mo |
Cu |
N |
Other |
|
321 |
.08 |
2.00 |
.045 |
.030 |
.75 |
17.00-19.00 |
9.00-12.00 |
.75 |
.75 |
.10 |
Ti=5x(C+N) min to .70 max |
All values are maximum values unless otherwise specified. Values are derived from applicable AMS and ASTM specifications.
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