Tubewell Steel & Engg. Co. is a leading manufacturer and stockist specializing in Alloy Steel Pipes, Tubes, Fittings and Flanges for critical industrial applications.
9% Chromium – 1% Molybdenum forged alloy steel flanges for severe sulphidation, high-temperature refinery and heater service.
Tubewell Steel & Engg. Co. is a manufacturer, stockist and supplier of ASTM A182 F9 flanges in Mumbai, India. Containing 8–10% chromium and 1% molybdenum, F9 offers outstanding resistance to high-temperature sulphidation and oxidation, and is the matching flange grade for A335 P9 pipes in refinery heaters and high-sulphur crude units.
The high-chrome flange grade for aggressive, high-temperature hydrocarbons
ASTM A182 F9 is a 9% chromium – 1% molybdenum ferritic alloy steel. Its high chromium content gives a dense, adherent oxide layer that withstands sulphur-bearing hydrocarbons and oxidising atmospheres far better than F5 or F22, while molybdenum provides creep strength for continuous duty at elevated temperatures. The added silicon (0.50–1.00%) further improves scaling resistance.
We supply F9 flanges forged from certified material, annealed or normalized and tempered at a minimum of 675°C, then CNC machined to ASME B16.5, B16.47 or EN 1092-1 with bores to suit the mating P9 pipe schedule. Each piece is hardness checked, PMI verified and hard-stamped for traceability, with EN 10204 3.1 / 3.2 certification and third-party inspection available on request.
Standard supply range for ASTM A182 F9 flanges
| Parameter | Details |
|---|---|
| Material Standard | ASTM A182, ASME SA182 |
| Grade | F9 (UNS K90941) |
| Dimension Standard | ASME B16.5 (1/2" – 24"), ASME B16.47 Series A & B (26" – 48"), MSS SP-44, EN 1092-1 |
| Size | 1/2" NB to 48" NB (DN 15 – DN 1200) |
| Pressure Class | ASME Class 150, 300, 600, 900, 1500, 2500 |
| PN Rating | PN6, PN10, PN16, PN25, PN40, PN64 |
| Flange Types | Weld Neck, Slip-On, Blind, Socket Weld, Threaded, Lap Joint, RTJ, Long Weld Neck, Orifice, Spectacle Blind |
| Facing | Raised Face (RF), Flat Face (FF), Ring Type Joint (RTJ), Tongue & Groove |
| Face Finish | Serrated 125 – 250 µin Ra (3.2 – 6.3 µm), smooth finish on request |
| Bore / Schedule | SCH 10 to SCH XXS, to match A335 P9 pipe |
| Heat Treatment | Annealed or Normalized & Tempered (tempering min. 675°C / 1250°F) |
| B16.5 Material Group | Group 1.14 (9Cr-1Mo) |
| Testing | PMI, Hardness, Tensile, Impact, UT, MPI / DPT, Visual & Dimensional |
| Certificates | EN 10204 3.1 / 3.2, IBR Certification, TPI Reports |
International equivalents of A182 F9
| Grade | ASTM / ASME | UNS | EN | W.Nr. | JIS G3203 | Nominal |
|---|---|---|---|---|---|---|
| F9 | A182 F9 / SA182 F9 | K90941 | X11CrMo9-1 | 1.7386 | SFVAF9 | 9Cr-1Mo |
Equivalents are the nearest comparable grades for reference; confirm suitability against the governing design code before substitution.
Weight %, as per ASTM A182
| Grade | C | Mn | P | S | Si | Cr | Mo |
|---|---|---|---|---|---|---|---|
| A182 F9 | 0.15 max | 0.30 – 0.60 | 0.030 max | 0.030 max | 0.50 – 1.00 | 8.0 – 10.0 | 0.90 – 1.10 |
Minimum values at room temperature
| Grade | Tensile Strength | Yield Strength (0.2%) | Elongation (in 2") | Reduction of Area | Hardness (HBW) |
|---|---|---|---|---|---|
| A182 F9 | 585 MPa (85 ksi) min | 380 MPa (55 ksi) min | 20% min | 40% min | 179 – 217 |
Typical values (for reference)
| Property | Metric | Imperial |
|---|---|---|
| Density | 7.70 g/cm³ | 0.278 lb/in³ |
| Melting Range | 1420 – 1500 °C | 2590 – 2730 °F |
| Modulus of Elasticity | 213 GPa | 30.9 × 10³ ksi |
| Thermal Conductivity (100°C) | 26 W/m·K | 15.0 BTU/h·ft·°F |
| Mean Thermal Expansion (20–300°C) | 11.6 µm/m·°C | 6.4 µin/in·°F |
| Specific Heat | 0.46 J/g·°C | 0.11 BTU/lb·°F |
| Max. Service Temperature | ≈ 650 °C | ≈ 1200 °F |
ASME B16.5 Class 300 weld neck flanges – dimensions in mm
| NPS | Flange OD | Thickness | RF Dia | Bolt Circle | Bolts | Hub Dia X | Hub Length Y |
|---|---|---|---|---|---|---|---|
| 1/2" | 95 | 12.7 | 34.9 | 66.7 | 4 × 1/2" | 38 | 51 |
| 3/4" | 115 | 14.3 | 42.9 | 82.6 | 4 × 5/8" | 48 | 56 |
| 1" | 125 | 15.9 | 50.8 | 88.9 | 4 × 5/8" | 54 | 60 |
| 1 1/4" | 135 | 17.5 | 63.5 | 98.4 | 4 × 5/8" | 64 | 64 |
| 1 1/2" | 155 | 19.1 | 73.0 | 114.3 | 4 × 3/4" | 70 | 67 |
| 2" | 165 | 20.7 | 92.1 | 127.0 | 8 × 5/8" | 84 | 68 |
| 2 1/2" | 190 | 23.9 | 104.8 | 149.2 | 8 × 3/4" | 100 | 75 |
| 3" | 210 | 27.0 | 127.0 | 168.3 | 8 × 3/4" | 117 | 78 |
| 4" | 255 | 30.2 | 157.2 | 200.0 | 8 × 3/4" | 146 | 84 |
| 5" | 280 | 33.4 | 185.7 | 235.0 | 8 × 3/4" | 178 | 97 |
| 6" | 320 | 35.0 | 215.9 | 269.9 | 12 × 3/4" | 206 | 97 |
| 8" | 380 | 39.7 | 269.9 | 330.2 | 12 × 7/8" | 260 | 110 |
| 10" | 445 | 46.1 | 323.8 | 387.4 | 16 × 1" | 321 | 116 |
| 12" | 520 | 49.3 | 381.0 | 450.8 | 16 × 1 1/8" | 375 | 129 |
| 14" | 585 | 52.4 | 412.8 | 514.4 | 20 × 1 1/8" | 425 | 141 |
| 16" | 650 | 55.6 | 469.9 | 571.5 | 20 × 1 1/4" | 483 | 144 |
| 18" | 710 | 58.8 | 533.4 | 628.6 | 24 × 1 1/4" | 533 | 157 |
| 20" | 775 | 62.0 | 584.2 | 685.8 | 24 × 1 1/4" | 587 | 160 |
| 24" | 915 | 68.3 | 692.2 | 812.8 | 24 × 1 1/2" | 702 | 167 |
Thickness = minimum flange thickness excluding 2 mm (0.06") raised face. Hub Dia X = hub diameter at base, Hub Length Y = length through hub of weld neck flange. All dimensions in mm.
Where ASTM A182 F9 flanges are used
Heater outlets and transfer lines processing high-sulphur crude.
Furnace crossover and header connections at high metal temperature.
Hydrotreater and hydrocracker lines with hot hydrogen and H₂S.
Cracking and reforming units exposed to oxidising atmospheres.
Nozzle and channel flanges on high-temperature exchangers.
Superheater and process steam connections in thermal stations.
Quality you can verify on every heat
Large inventory for fast dispatch
MTC EN 10204 3.1 / 3.2
Positive material identification
Pan-India & export shipping
Quick answers about A182 F9 flanges
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