321-321H Stainless Steel

Grade 321 / 321H

Typical industrial sectors:
• Chemical Industry
• Oil and Gas
• Storage Tanks
• Aviation & Aerospace

 More information.

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

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%).

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

1. Condensers

2. Heat exchangers

3. Filters

4. Pressure vessels

5. Valves

6. Flanges and fittings