Stainless Steel · Flanges · ASTM A182 / ASME SA182 F321
SS 321 Stainless Steel Flanges
In short: SS 321 flanges forged to ASTM A182 F321 are used on hot process and exhaust lines built in SS 321 pipe, in all ASME B16.5 types and classes.
- S32100
- UNS number
- 7.93
- density, g/cm³
- 3.1 / 3.2
- EN 10204 certificates
- 6
- SS 321 product forms
Why this combination
Why SS 321 in flanges
Flanges in hot service see the same sensitising temperatures as the pipe; F321 keeps them stabilised.
High-temperature bolting such as B16 or B8T is chosen to suit the operating temperature.
Specification
How to specify SS 321 flanges
NPS ½" – 24" (B16.5), 26" – 60" (B16.47 Series A/B); Class 150, 300, 600, 900, 1500, 2500; EN 1092-1 PN 6 – PN 100 on request
- Specification
- ASTM A182 / ASME SA182 F321
- UNS
- S32100
- EN / W.Nr.
- 1.4541
- Dimensions
- ASME B16.5 / B16.47
Sizes and weights
SS 321 flanges sizes, weighed at 7.93 g/cm³
Other sizes on request. For general flanges information, such as manufacturing routes and end finishes, see the flanges guide.
NPS ½" – 24" (B16.5), 26" – 60" (B16.47 Series A/B); Class 150, 300, 600, 900, 1500, 2500; EN 1092-1 PN 6 – PN 100 on request
Chemistry
SS 321 composition
- UNS
- S32100
- EN / W.Nr.
- 1.4541 · X6CrNiTi18-10
- Density
- 7.93 g/cm³
| Element | Limit, % | Why it matters |
|---|---|---|
| C | 0.08 max | |
| Mn | 2.00 max | |
| P | 0.045 max | |
| S | 0.030 max | |
| Si | 0.75 max | |
| Cr | 17.0 – 19.0 | |
| Ni | 9.0 – 12.0 | |
| Ti | 5×(C+N) – 0.70 | |
| N | 0.10 max |
Limits per ASTM A240; other product forms and specifications differ slightly. Your order's specification and edition govern.
Questions
About SS 321 flanges
Which bolting suits hot SS 321 flanges?
Typically B16 alloy or stainless B8 grades, selected for temperature and relaxation.
Are F321 flanges available in Class 600?
Yes, Class 150 through 2500.
From enquiry to dispatch
How a SS 321 flanges order runs
- 01 EnquiryGrade, specification, size, quantity
- 02 ReviewChecked against your standard
- 03 InspectPMI, dimensions, TPI if required
- 04 CertifyEN 10204 3.1 / 3.2, heat traceable
- 05 ShipPacked and documented for the destination
Need SS 321 flanges?
Send size, quantity, specification and destination. We reply with availability, certificates and delivery.