Tubewell Steel & Engg. Co. is a leading manufacturer and stockist specializing in Alloy Steel Pipes, Tubes, Fittings and Flanges for critical industrial applications.
ASTM A182 chrome-moly slip-on flanges that slide over the pipe for easy alignment and economical fillet-welded joints.
Tubewell Steel & Engg. Co. manufactures, stocks and supplies alloy steel slip-on flanges from Mumbai, India in ASTM A182 F5, F9, F11, F22 and F91. A slip-on flange is bored slightly larger than the pipe OD, slid over the pipe and fillet welded inside and outside – offering quick alignment and lower installation cost for moderate-pressure chrome-moly lines.
Easy-to-fit flanges for moderate-pressure alloy steel piping
A slip-on flange has a short hub and a bore slightly larger than the outside diameter of the pipe. The pipe is inserted into the flange, set back from the face by roughly the pipe wall thickness, and then fillet welded at the hub and at the bore. Because the flange slides freely along the pipe, it is easy to align during fit-up, needs less accurate cutting than a weld neck and is lighter and less expensive to forge – a practical choice for utility, low-pressure steam and process lines.
We supply alloy steel slip-on flanges forged in ASTM A182 F5, F9, F11, F22 and F91, heat treated per specification and machined to ASME B16.5 or EN 1092-1 (Type 01 plate and Type 12 hubbed slip-on). Under ASME B31.1 / B31.3 the calculated strength of a slip-on joint is about two-thirds that of a weld neck under internal pressure and far lower under fatigue, so we recommend weld neck flanges for severe cyclic duty. All flanges carry heat traceability and EN 10204 3.1 certification.
Standard supply range for alloy steel slip-on flanges
| Parameter | Details |
|---|---|
| Material Standard | ASTM A182, ASME SA182 |
| Grades | F5, F5a, F9, F11 Class 1 / 2 / 3, F12, F22 Class 1 / 3, F91 |
| Dimension Standard | ASME B16.5, EN 1092-1 Type 01 & Type 12, BS 4504, custom drawings |
| Size | 1/2" NB to 24" NB (DN 15 – DN 600); larger sizes to drawing |
| Pressure Class | ASME Class 150, 300, 600, 900, 1500 |
| PN Rating | PN6, PN10, PN16, PN25, PN40, PN64 |
| Types | Hubbed Slip-On (SO), Plate Slip-On, Reducing Slip-On |
| Facing | Raised Face (SORF), Flat Face (SOFF), Ring Type Joint on request |
| Face Finish | Serrated 125 – 250 µin Ra (3.2 – 6.3 µm), smooth finish on request |
| Bore | Machined to suit pipe OD as per ASME B16.5 (bore B) |
| Heat Treatment | Annealed or Normalized & Tempered per ASTM A182 (F91: N&T) |
| Manufacturing | Closed-die forged / rolled ring, CNC machined |
| Testing | PMI, Hardness, Tensile, Impact, UT, MPI / DPT, Visual & Dimensional |
| Certificates | EN 10204 3.1 / 3.2, IBR Certification, TPI Reports |
Grades available for slip-on flanges and their international equivalents
| Grade | ASTM / ASME | UNS | EN 10222-2 | W.Nr. | Matching Pipe | Nominal |
|---|---|---|---|---|---|---|
| F5 | A182 F5 | K41545 | X16CrMo5-1 | 1.7366 | A335 P5 | 5Cr-0.5Mo |
| F9 | A182 F9 | K90941 | X11CrMo9-1 | 1.7386 | A335 P9 | 9Cr-1Mo |
| F11 | A182 F11 Cl.2 | K11572 | 13CrMo4-5 | 1.7335 | A335 P11 | 1.25Cr-0.5Mo |
| F22 | A182 F22 Cl.3 | K21590 | 11CrMo9-10 | 1.7383 | A335 P22 | 2.25Cr-1Mo |
| F91 | A182 F91 | K90901 | X10CrMoVNb9-1 | 1.4903 | A335 P91 | 9Cr-1Mo-V |
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 max | S max | Si | Cr | Mo | Others |
|---|---|---|---|---|---|---|---|---|
| F5 | 0.15 max | 0.30 – 0.60 | 0.030 | 0.030 | 0.50 max | 4.0 – 6.0 | 0.44 – 0.65 | Ni 0.50 max |
| F9 | 0.15 max | 0.30 – 0.60 | 0.030 | 0.030 | 0.50 – 1.00 | 8.0 – 10.0 | 0.90 – 1.10 | – |
| F11 Cl.2 | 0.10 – 0.20 | 0.30 – 0.80 | 0.040 | 0.040 | 0.50 – 1.00 | 1.00 – 1.50 | 0.44 – 0.65 | – |
| F22 Cl.3 | 0.05 – 0.15 | 0.30 – 0.60 | 0.040 | 0.040 | 0.50 max | 2.00 – 2.50 | 0.87 – 1.13 | – |
| F91 | 0.08 – 0.12 | 0.30 – 0.60 | 0.020 | 0.010 | 0.20 – 0.50 | 8.0 – 9.5 | 0.85 – 1.05 | V 0.18–0.25, Nb 0.06–0.10, N 0.03–0.07, Ni 0.40 max |
Minimum values at room temperature, as per ASTM A182
| Grade | Tensile Strength | Yield Strength (0.2%) | Elongation (in 2") | Reduction of Area | Hardness (HBW) |
|---|---|---|---|---|---|
| F5 | 485 MPa (70 ksi) min | 275 MPa (40 ksi) min | 20% min | 35% min | 143 – 217 |
| F9 | 585 MPa (85 ksi) min | 380 MPa (55 ksi) min | 20% min | 40% min | 179 – 217 |
| F11 Cl.2 | 485 MPa (70 ksi) min | 275 MPa (40 ksi) min | 20% min | 30% min | 143 – 207 |
| F22 Cl.3 | 515 MPa (75 ksi) min | 310 MPa (45 ksi) min | 20% min | 30% min | 156 – 207 |
| F91 | 620 MPa (90 ksi) min | 415 MPa (60 ksi) min | 20% min | 40% min | 248 max |
Typical values (for reference)
| Property | F5 | F9 | F11 | F22 | F91 |
|---|---|---|---|---|---|
| Density (g/cm³) | 7.75 | 7.70 | 7.75 | 7.80 | 7.76 |
| Modulus of Elasticity (GPa) | 210 | 213 | 205 | 210 | 218 |
| Thermal Conductivity at 100°C (W/m·K) | 33 | 26 | 37 | 36 | 26 |
| Mean Thermal Expansion 20–300°C (µm/m·°C) | 11.9 | 11.6 | 12.4 | 12.6 | 11.3 |
| Specific Heat (J/g·°C) | 0.46 | 0.46 | 0.46 | 0.46 | 0.45 |
| Approx. Max. Service Temp. (°C) | ≈ 650 | ≈ 650 | ≈ 595 | ≈ 600 | ≈ 650 |
ASME B16.5 Class 150 & Class 300 slip-on flanges – dimensions in mm
| NPS | Bore B | Cl.150 OD | Cl.150 Thk | Cl.150 Length Y | Cl.150 BCD | Cl.300 OD | Cl.300 Thk | Cl.300 Length Y | Cl.300 BCD |
|---|---|---|---|---|---|---|---|---|---|
| 1/2" | 22.2 | 90 | 9.6 | 14 | 60.3 | 95 | 12.7 | 21 | 66.7 |
| 3/4" | 27.7 | 100 | 11.2 | 14 | 69.9 | 115 | 14.3 | 24 | 82.6 |
| 1" | 34.5 | 110 | 12.7 | 16 | 79.4 | 125 | 15.9 | 25 | 88.9 |
| 1 1/4" | 43.2 | 115 | 14.3 | 19 | 88.9 | 135 | 17.5 | 25 | 98.4 |
| 1 1/2" | 49.5 | 125 | 15.9 | 21 | 98.4 | 155 | 19.1 | 29 | 114.3 |
| 2" | 61.9 | 150 | 17.5 | 24 | 120.7 | 165 | 20.7 | 32 | 127.0 |
| 2 1/2" | 74.6 | 180 | 20.7 | 27 | 139.7 | 190 | 23.9 | 37 | 149.2 |
| 3" | 90.7 | 190 | 22.3 | 29 | 152.4 | 210 | 27.0 | 41 | 168.3 |
| 4" | 116.1 | 230 | 22.3 | 32 | 190.5 | 255 | 30.2 | 46 | 200.0 |
| 5" | 143.8 | 255 | 22.3 | 35 | 215.9 | 280 | 33.4 | 49 | 235.0 |
| 6" | 170.7 | 280 | 23.9 | 38 | 241.3 | 320 | 35.0 | 51 | 269.9 |
| 8" | 221.5 | 345 | 27.0 | 43 | 298.5 | 380 | 39.7 | 60 | 330.2 |
| 10" | 276.2 | 405 | 28.6 | 48 | 362.0 | 445 | 46.1 | 65 | 387.4 |
| 12" | 327.0 | 485 | 30.2 | 54 | 431.8 | 520 | 49.3 | 71 | 450.8 |
| 14" | 359.2 | 535 | 33.4 | 56 | 476.3 | 585 | 52.4 | 75 | 514.4 |
| 16" | 410.5 | 595 | 35.0 | 62 | 539.8 | 650 | 55.6 | 81 | 571.5 |
| 18" | 461.8 | 635 | 38.1 | 67 | 577.9 | 710 | 58.8 | 87 | 628.6 |
| 20" | 513.1 | 700 | 41.3 | 71 | 635.0 | 775 | 62.0 | 94 | 685.8 |
| 24" | 616.0 | 815 | 46.1 | 81 | 749.3 | 915 | 68.3 | 105 | 812.8 |
Bore B = slip-on bore (same for Class 150 & 300), Thk = minimum flange thickness excluding 2 mm (0.06") raised face, Y = length through hub, BCD = bolt circle diameter. Bolting is identical to other B16.5 flange types of the same class. All dimensions in mm.
Where alloy steel slip-on flanges are used
Auxiliary steam, drain and vent lines at moderate pressure.
Low-pressure process, flare and utility headers.
Low-pressure shell connections and cooling water nozzles.
Process lines where easy maintenance and alignment matter.
Blow-down, soot-blower and low-pressure steam lines.
Engine-room steam and exhaust piping on marine vessels.
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
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