More information
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A 300 series stainless steel less sensitive and more suited to elevated temperature environments (up to 900°C) when compared against the more standard austenitic grades (304/316). 321/321H has increased resistance to scaling and intergranular corrosion (versus 304/316 material) due mainly to its added titanium content.
Grade EN Steel Number UNS
321 1.4878 S32100
321H 1.4541 S32109
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When comparing the chemical structure of 321/321H against standard austenitic grades such as 304/316 the main separating factor is the Titanium content, which is used as a stabalising element allowing the material to operate at a higher temperature range. The amount of titanium content required in 321/321H is indicative of the product percentage of carbon (Ti = 5 x C%).
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The only differential between 321 & 321H is a higher carbon content (321H, 0.05% versus 0.04%), the increased addition of carbon in 321H allows for a greater creep resistance and higher strength performance in elevated temperature environments (above 530°C).
Our stock range for 321/321H consists of material available from 6mm to 50mm thick and plate sizes up to and including 12m in length and 2.5m in width
Applications
- Condensers
- Heat exchangers
- Filters
- Pressure vessels
- Valves
- Flanges and fittings
Properties
| Grade | Chemical analysis | PREN | Mechanical properties | |||||
|---|---|---|---|---|---|---|---|---|
| C | Cr | Ni | Mo | Proof stress | Tensile | Elongation | ||
| 321 | 0.004 | 17.3 | 9.1 | – | 19 | 250 | 515-730 | 40 |
| 321H | 0.005 | 18.5 | 9.5 | – | 19 | 250 | 515-700 | 40 |
