Introduction
321 stainless steel grade is a really common grade preferred for heat-resistant applications. This grade is written as 1.4541 or X6CrNiTi18-10 according to EN norm and it is written as UNS S32100 according to UNS norm. 1.4541 stainless steel is similar to the mix of 304 and 316Ti grades and we can think of 321 grade as the mixture of these two different grades. This grade has good corrosion resistance and at temperatures like 600-700 degrees, this grade has still good heat and corrosion resistance. 321 stainless is widely used in Germany and Russia. If this grade is not enough because of its heat resistance, then 310 / 310s grades can be chosen for higher temperatures. The ingredient of 321 grade is similar to 304 stainless steel grade so 321 grade can be considered as the titanium added version of 304 grade.
Production Specification
Standard:ASTM A409, A312,JIS G3459, JIS G3463
OD: 10-1067mm
WT: 1-150mm
Length:1000-13000mm
Surface treatment: Mill finished, Polished.
321 Stainless Steel Pipe Chemical Composition:
| 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 |
321 Stainless Steel Pipe Mechanical Properties:
| 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 |
Applications
Aerospace – piston engine manifolds
Chemical Processing
Expansion Joints
Food Processing – Equipment and storage
Petroleum Refining – polythionic acid service
Waste Treatment – thermal oxidizersPharmaceutical Production
