321 Stainless Steel Pipe
321 is the titanium stabilised austenitic grade preferred for heat resistant applications, written as 1.4541 or X6CrNiTi18-10 under EN and UNS S32100 under the UNS system. Its ingredient list is close to 304, and it…
What This Product Is For
321 is the titanium stabilised austenitic grade preferred for heat resistant applications, written as 1.4541 or X6CrNiTi18-10 under EN and UNS S32100 under the UNS system. Its ingredient list is close to 304, and it behaves like a mix of 304 and 316Ti. It keeps good heat and corrosion resistance at temperatures around 600 to 700 C, and it is widely used in Germany and Russia.
Key Benefits
- Titanium stabilisation protects the weld zone from carbide precipitation
- Good heat and corrosion resistance sustained at 600 to 700 C
- Composition close to 304, so fabrication behaviour is familiar to the shop
- Widely specified in Germany and Russia, which simplifies export documentation to those markets
- Outside diameter range 10 to 1067 mm with wall from 1 mm
Who It Is For
- Piping fabricators supplying German and Russian specifications
- Refinery and petrochemical maintenance teams
- Heat exchanger builders needing stabilised tube
- Buyers working to ASTM A312 or JIS G3459
Problems It Solves
- Weld decay in unstabilised austenitic pipe after welding
- Loss of corrosion resistance in the 600 to 700 C band
- Grade cross reference confusion between 321, 1.4541 and S32100
- Sourcing thin wall stabilised pipe down to 1 mm
Application Scenarios
- Exhaust and hot gas piping running at 600 to 700 C
- Expansion joints and bellows in hot service
- Refinery and petrochemical lines welded without post weld annealing
- Heat exchanger tubing where a stabilised grade is specified
Specifications
Every value below is taken from the published product data. Where a figure is not published it is left out rather than estimated.
| Grade | 321, 1.4541, X6CrNiTi18-10, UNS S32100 |
|---|---|
| Standard | ASTM A409, ASTM A312, JIS G3459, JIS G3463 |
| Outside Diameter | 10 to 1067 mm |
| Wall Thickness | 1 to 150 mm |
| Length | 1000 to 13000 mm |
| Chromium | 17.00 to 19.00 percent |
| Surface Treatment | Mill finished, polished |
| Related Grade | 321H |
Technical Features
- Titanium stabilised austenitic stainless steel
- Chromium 17.00 minimum to 19.00 maximum percent
- Designations 1.4541, X6CrNiTi18-10 and UNS S32100
- Good heat and corrosion resistance at 600 to 700 C
- 321H variant available where higher carbon is required
Materials
- 321 titanium stabilised austenitic stainless steel
Manufacturing Process
- Seamless piercing and drawing
- Tube welding
- Solution annealing
- Pickling and polishing
Quality Control
- Chromium checked within the 17.00 to 19.00 percent range
- Titanium stabilisation ratio verified against the grade requirement
- Outside diameter and wall measured against the ordered size
- Surface condition inspected as mill finished or polished
Customisation Options
- Mill finished or polished surface
- Wall thickness from 1 mm up to 150 mm
- 321H supplied where the higher carbon variant is specified
Use Guide
- Use 321 where the line runs around 600 to 700 C and step up to 310 or 310S above that
- Weld with a matching stabilised filler such as 347 class consumable
- Confirm whether the project needs 321 or 321H before ordering, as carbon differs
- Quote 1.4541 or S32100 on export documents for German and Russian projects
How It Compares With the Alternatives
| 304 stainless pipe | 321 has a similar base composition to 304 but adds titanium stabilisation, which protects the weld zone and lifts heat resistance |
|---|---|
| 310S stainless pipe | If 321 is not enough because of its heat resistance limit, 310 and 310S are chosen for higher temperatures |
| TP347 stainless pipe | Both are stabilised, but 347 uses niobium rather than titanium, which survives repeated high temperature cycles with less stabiliser loss |
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321 Stainless Steel Pipe Questions
What temperature can 321 handle
What other designations does 321 carry
How does 321 compare with 304
What should I use if 321 is not heat resistant enough
What size range is available
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Quote 321 Stainless Steel Pipe
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