SS 321 Anchor FlangeASTM A182 · Project drawing · Manufacturer, stockist & exporter, India
AISI 321 · UNS S32100 · ANC
An SS 321 anchor flange is a forged ring welded into a pipeline to fix it to a structure, made from SS 321 to ASTM A182 F321. Anchor flanges restrain pipelines against thrust and movement — at pump stations, river crossings and pig traps. They are made to project drawings.
- ASTM A182
- Project drawing
- EN 10204 3.1 / 3.2
- Export packing
Reviewed by the Kanak Steel & Engineering Co. technical team · Updated October 2026
What is an SS 321 Anchor Flange?
- What it is
- A forged ring welded into a pipeline to fix it to a structure
- Material
- ASTM A182 F321
- Dimensions
- Project drawing
- Grade
- SS 321 · UNS S32100
- Best at
- High-temperature service between 425 and 815 °C
SS 321 Anchor Flange Specification
| Product | SS 321 Anchor Flange |
|---|---|
| Material standard | ASTM A182 F321 |
| Dimensional standard | Project drawing |
| Sizes | ½" – 24" (ASME B16.5) · 26" – 60" (ASME B16.47) |
| Pressure class | Class 150, 300, 400, 600, 900, 1500, 2500 · PN 6 – PN 100 |
| Facing | RF · FF · RTJ · tongue & groove |
| Bore | To match pipe schedule (state on order) |
| Testing | PMI · dimensional · NDT and IGC on request |
| Documents | EN 10204 3.1 · 3.2 with third-party inspection |
When to Choose an Anchor Flange
Anchor flanges restrain pipelines against thrust and movement — at pump stations, river crossings and pig traps. They are made to project drawings.
- Made to drawing
- Usually weld neck on both sides
- Often large and heavy forgings
More on choosing: Anchor flange guide.
SS 321 Anchor Flange: Why 321 for anchor flanges
Anchor flanges restrain pipelines against thrust and movement — at pump stations, river crossings and pig traps. They are made to project drawings. In SS 321, the choice usually comes down to the medium and temperature — the rows here are the points buyers check for this exact combination.
| Why this grade | Stainless flanges are chosen where carbon steel would rust or contaminate the process. SS 321 is picked for high-temperature service between 425 and 815 °C. |
|---|---|
| Typical service | Aircraft exhaust — Manifolds, bellows and exhaust systems. |
| B16.5 material group | 2.4 |
| Bolting | ASTM A193 B8T studs with A194 8T nuts |
| Welding to carbon steel | ER309L (or E309L electrode) is the usual filler when joining it to carbon steel |
| Matching filler | ER347 (AWS A5.9) |
SS 321 Anchor Flange Chemical Composition
| Element | Weight % |
|---|---|
| Chromium | 17.0 – 19.0 |
| Nickel | 9.0 – 12.0 |
| Titanium | 5 × (C + N) min, 0.70 max |
| Carbon | 0.08 max |
| Manganese | 2.00 max |
| Silicon | 0.75 max |
| Nitrogen | 0.10 max |
| Phosphorus | 0.045 max |
SS 321 Anchor Flange Mechanical Properties
| Annealed plate & sheet | Value |
|---|---|
| Tensile strength | 515 MPa · 75 ksi |
| Yield strength 0.2% | 205 MPa · 30 ksi |
| Elongation | 40% |
| Hardness | 217 HB max |
Full chemistry, properties and equivalents are on the SS 321 grade page.
Other SS 321 flanges
SS 321 Anchor Flanges for export
FOB / CIF · Nhava Sheva (JNPT), MumbaiSS 321 Anchor Flange — questions buyers ask
What information is needed to quote an anchor flange?
The project drawing with pipe size, wall, design loads and material, plus the inspection plan.
What pressure rating does a SS 321 anchor flange have?
It depends on class and temperature. SS 321 forgings are in ASME B16.5 material group 2.4; read your class column in that group's table at the design temperature.
Can SS 321 anchor flanges be welded to carbon steel?
Yes — ER309L (or E309L electrode) is the usual filler when joining it to carbon steel.
Which standard covers SS 321 anchor flanges?
The material is ASTM A182 F321; dimensions follow Project drawing. Always state both on your purchase order, with the edition if your project specifies one.
What decides the price of a SS 321 anchor flange?
The alloy price, the size and pressure class, quantity, and the testing and documents required. Send your list and we quote the same working day.
What documents do you supply?
EN 10204 3.1 mill certificates as standard, 3.2 with third-party inspection on request, plus dimensional and PMI reports.
Sources: the ASTM / ASME specifications named on this page and producer datasheets · Last updated October 2026