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321 321H Stainless Steel Seamless Pipe Differents.
321 Stainless Steel: An austenitic stainless steel with the addition of titanium. The presence of titanium helps prevent carbide precipitation at high temperatures, enhancing resistance to intergranular corrosion.
321H Stainless Steel: This is the high-carbon version of 321 stainless steel. It contains a higher carbon content compared to 321, resulting in increased strength at elevated temperatures.
Stainless Steel 321 321H Seamless Pipe Equivalent Grades
| STANDARD | UNS | WERKSTOFF NR. |
| SS 321 | S32100 | 1.4541 |
| SS 321H | S32019 | 1.4878 |
Stainless Steel 321 321H Seamless Pipe Chemical Composition
| Grade | Ni | N | Cr | C | Si | Mn | P | S | Ti |
| SS 321 | 9 – 12 | 0.10 | 17 – 19 | 0.8 max | 1 max | 2 max | 0.040 max | 0.030 max | 4(C+N) |
| SS 321H | 9 – 12 | 0.10 | 17 – 19 | 0.4 – 0.8 | 0.75 max | 2 max | 0.045 max | 0.03 | 0.70 max |
Applications:
321 Stainless Steel: Commonly used in high-temperature applications such as aerospace engine components,furnace equipment, and chemical processing units.
321H Stainless Steel: Suited for applications with even higher temperature requirements, such as heat exchangers, high-temperature furnace equipment, etc.