Alloy 321 (UNS S32100) is titanium stabilized austenitic stainless steel plate with good general corrosion resistance. It has excellent resistance to intergranular corrosion after exposure to temperatures in the chromium carbide precipitation range of 800 - 1500°F (427 - 816°C). The alloy resists oxidation to 1500°F (816°C) and has higher creep and stress rupture properties than alloys 304 and 304L. It also possesses good low temperature toughness.
Alloy 321H (UNS S 32109) stainless steel plate is the higher carbon (0.04 - 0.10) version of the alloy. It was developed for enhanced creep resistance and for higher strength at temperatures above 1000oF (537°C). In most instances, the carbon content of the plate enables dual certification.
Alloy 321 stainless steel plate cannot be hardened by heat treatment, only by cold working. It can be easily welded and processed by standard shop fabrication practices.
Chemical Analysis
Weight % (all values are maximum unless a range is otherwise indicated)
| Element |
321 |
321H |
| Chromium |
17.00 min.-19.00 max. |
17.00 min.-19.00 max. |
| Nickel |
9.00 min.-12.00 max. |
9.00 min.-12.00 max. |
| Carbon |
0.08 |
0.04 min.-0.14 max. |
| Manganese |
2.00 |
2.00 |
| Phosphorus |
0.045 |
0.045 |
| Sulfur |
0.03 |
0.03 |
| Silicon |
0.75 |
0.75 |
| Titanium |
5 x (C + N) min.-0.70 max. |
4 x (C + N) min.-0.70 max. |
| Nitrogen |
0.10 |
0.10 |
| Iron |
Balance |
Balance |
Physical Properties
Density
0.286 lbs/in3
7.920 g/cm3
Specific Heat
0.12 BTU/lb-°F (32 – 212°F)
444 J/kg-°K (0 – 100°C)
Modulus of Elasticity
28.0 x 106 psi
193 GPa
Thermal Conductivity 200°F (100°C)
9.3 BTU/hr/ft2/ft/°F
16.0 W/m-°K
Melting Range
2550 – 2635°F
1398 – 1446°C
Electrical Resistivity
72 Microhm-cm at 20°F