321 Stainless Steel Pipes and Tubes Type 321 is a
standard austenitic 18/8 chromium nickel alloy with the addition of
Titanium making it an excellent choice in elevated temperature
environments. The titanium stabilises the material removing its
susceptibility to the effects of intergranular corrosion. 321 is
therefore the stainless steel material of choice for applications in
working environments up to 9000 C. A drawback of
Type 321 is that the titanium does not transfer well across a high
temperature arc, so it is not recommended as a welding consumable.
In such instances, 347 is the preferred choice as the Niobium performs
the same function as Titanium but can be still transferred across a high
temperature arc. Type 347 is therefore the consumable of choice for
welding Grade 321. The steel has excellent forming and welding
qualities and excellent toughness even at cryogenic temperatures. If you
are looking for a stainless steel to provide resistance to
intergranular corrosion, 304L is the normal choice as it is a more
commonly used and supplied steel. However, 321 is a much better option in operating temperature environments in excess of 5000 C and therefore have its own merits. Note that Type 321 does not polish well so it is not practical to use this material as cosmetic architectural feature. Product Range Specifications: ASTM A/ASME SA213/A249/A269/A312/A358 CL. I to V ASTM A789/A790 Sizes (Seamless): 1/2" NB - 24" NB Sizes (ERW): 1/2" NB - 24" NB Sizes (EFW): 6" NB - 100" NB Table 1. Composition ranges for 321 grade stainless steel
| Grade | C | Mn | Si | P | S | Cr | Mo | Ni | N | Other | |
| 321 | min. max | - 0.08 | 2.00 | 0.75 | 0.045 | 0.030 | 17.0 19.0 | - | 9.0 12.0 | 0.10 | Ti=5(C+N) 0.70 |
| 321H | min. max | 0.04 0.10 | 2.00 | 0.75 | 0.045 | 0.030 | 17.0 19.0 | - | 9.0 12.0 | - | Ti=4(C+N) 0.70 |
| 347 | min. max | 0.08 | 2.00 | 0.75 | 0.045 | 0.030 | 17.0 19.0 | - | 9.0 13.0 | - | Nb=10(C+N) 1.0 |
| Place of Origin | Not Given |
| Minimum Order Quantity | Not Given |
| Supply Ability | Not Given |
| Packaging Details | Not Given |
| Delivery Details | Not Given |
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