Alloy Steel · Flanges · ASTM A182 F91
ASTM A182 F91 Flanges
In short: ASTM A182 F91 flanges and forged fittings are used on P91 piping and headers in power plants.
- P91
- Designation
- 7.77
- density, g/cm³
- 3.1 / 3.2
- EN 10204 certificates
- 5
- P91 product forms
Why this combination
Why P91 in flanges
F91 forgings carry the same 9Cr-1Mo-V chemistry and heat-treatment sensitivity as the pipe.
High-temperature bolting such as B16 or creep-resistant grades are selected per design.
Specification
How to specify ASTM A182 F91
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 F91
- Dimensions
- ASME B16.5 / B16.47
Sizes and weights
ASTM A182 F91 sizes, weighed at 7.77 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
P91 composition
- Density
- 7.77 g/cm³
| Element | Limit, % | Why it matters |
|---|---|---|
| C | 0.08 – 0.12 | |
| Mn | 0.30 – 0.60 | |
| P | 0.020 max | |
| S | 0.010 max | |
| Si | 0.20 – 0.50 | |
| Cr | 8.00 – 9.50 | |
| Mo | 0.85 – 1.05 | |
| V | 0.18 – 0.25 | |
| Nb | 0.06 – 0.10 | |
| N | 0.030 – 0.070 | |
| Ni | 0.40 max | |
| Al | 0.02 max |
Limits per ASTM A335 (P91); other product forms and specifications differ slightly. Your order's specification and edition govern.
Questions
About ASTM A182 F91
Which bolting suits F91 flanges?
High-temperature alloy bolting chosen for the design temperature.
Are F91 flanges hardness tested?
Commonly, as for pipe and fittings.
From enquiry to dispatch
How a ASTM A182 F91 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 ASTM A182 F91?
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