ASTM 321 Stainless Steel Seamless Pipe , Polished Stainess
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321 Stainless Steel
A Titanium Stabilized Austenitic Stainless Steel with Excellent
Resistance to Intergranular Corrosion After Exposure to
Temperatures in the Chromium Carbide Precipitation Range of
800–1500°F (427–816°C)
Alloy 321 (UNS S32100) is a titanium stabilized austenitic
stainless steel with good general corrosion resistance. It has
excellentresistance 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 S32109) 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 1000°F (537°C). In most instances, the carbon content of the
plate enables dual certification. Alloy 321 cannot be hardened
byheat treatment, only by cold working. It can be easily welded and
processed by standard shop fabrication practices.
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.– 0.10 max. |
| Manganese | 2 | 2 |
| 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 | 0.1 | 0.1 |
| Iron | Balance | Balance |
Mechanical Properties
Typical Values at 68째F (20째C)
Yield Strength
0.2% Offset | Ultimate Tensile
Strength | Elongation
in 2 in. | Hardness |
| psi(min.) | (Mpa) | psi(min.) | (Mpa) | %(min.) | (max.) |
| 30,000 | 205 | 75,000 | 515 | 40 | 217 Brinell |
Hot FormingHot Forming
Working temperatures of 2100–2300°F (1149–1260°C) are recommended
for forging, upsetting and other hot working processes. Do not work
this alloy
at temperatures below 1700°F (927°C). Material must be water
quenched or fully annealed after working to re-attain maximum
corrosion resistance.
Cold Forming
The alloy is quite ductile and forms easily.
Welding
Alloy 321 can be readily welded by most standard processes. A post
weld heat treatment is not necessary.
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