Tubewell Steel & Engg. Co. is a leading manufacturer and stockist specializing in Alloy Steel Pipes, Tubes, Fittings and Flanges for critical industrial applications.
Tubewell Steel & Engg. Co. is a manufacturer, stockist and supplier of alloy steel forged fittings in Mumbai, India. Our ASTM A182 socket weld and threaded fittings in F5, F9, F11, F22 and F91 grades are forged, machined and heat treated for leak-tight small-bore connections in steam, power and refinery piping.
Forged chrome-moly fittings for small-bore, high-pressure service
Alloy steel forged fittings are manufactured from ASTM A182 chromium-molybdenum forgings or bar stock and machined to the dimensions of ASME B16.11. Unlike butt-weld fittings, they join pipe through a socket weld or a threaded connection, which makes them ideal for instrument, drain, vent, bypass and sampling lines up to 4" NB. The forging process refines the grain flow and gives a dense, defect-free body that easily withstands the pressure ratings of Class 2000, 3000, 6000 and 9000.
We supply the full chrome-moly family – F5 and F9 for corrosive refinery service, F11 and F22 for steam and boiler lines, and the creep-strength-enhanced F91 for supercritical power plants. Each fitting is heat treated as required by ASTM A182, hardness tested, marked as per MSS SP-25 and shipped with EN 10204 3.1 mill test certificates. IBR certification and third-party inspection by BV, TÜV, SGS or Lloyd's are available on request.
Standard supply range for alloy steel forged fittings
| Parameter | Details |
|---|---|
| Material Standard | ASTM A182, ASME SA182 |
| Grades | F5, F9, F11 (Class 1, 2, 3), F12, F22 (Class 1, 3), F91 |
| Dimension Standard | ASME B16.11, MSS SP-79, MSS SP-83, MSS SP-95, MSS SP-97, BS 3799 |
| Size Range | 1/8" NB to 4" NB (socket weld & threaded); olets for run pipe up to 36" |
| Socket Weld Class | Class 3000, 6000, 9000 |
| Threaded Class | Class 2000, 3000, 6000 |
| Thread Type | NPT (ASME B1.20.1), BSPT (ISO 7-1 / BS 21), BSPP |
| Types | 90° & 45° Elbow, Tee, Cross, Full & Half Coupling, Reducing Coupling, Cap, Union, Boss, Plug, Bushing, Swage Nipple, Weldolet, Sockolet, Threadolet |
| Manufacturing | Closed-die forged / machined from forged bar, CNC finished |
| Heat Treatment | Annealed or Normalized & Tempered as per ASTM A182 |
| Surface Finish | Shot blasted, anti-rust oil, black or yellow passivated |
| Marking | As per MSS SP-25 – grade, class, size, heat number, manufacturer's mark |
| Testing | Hardness, PMI, Tensile, Dimensional, Hydrostatic (on request), UT / MPI / DPT |
| Certificates | EN 10204 3.1 / 3.2, IBR Form III-C, TPI Reports |
International equivalents of ASTM A182 chrome-moly grades
| Grade | ASTM | UNS | EN | W.Nr. | Nominal Alloy |
|---|---|---|---|---|---|
| F5 | A182 F5 | K41545 | X11CrMo5 | 1.7362 | 5Cr – 0.5Mo |
| F9 | A182 F9 | K90941 | X11CrMo9-1 | 1.7386 | 9Cr – 1Mo |
| F11 | A182 F11 | K11597 / K11572 | 13CrMo4-5 | 1.7335 | 1.25Cr – 0.5Mo |
| F22 | A182 F22 | K21590 | 10CrMo9-10 / 11CrMo9-10 | 1.7380 / 1.7383 | 2.25Cr – 1Mo |
| F91 | A182 F91 | K90901 | X10CrMoVNb9-1 | 1.4903 | 9Cr – 1Mo – V – Nb |
Weight %, as per ASTM A182 (range across grades shown in chips)
| Grade | C | Mn | P | S | Si | Cr | Mo | Others |
|---|---|---|---|---|---|---|---|---|
| F5 | 0.15 max | 0.30 – 0.60 | 0.030 max | 0.030 max | 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 max | 0.030 max | 0.50 – 1.00 | 8.0 – 10.0 | 0.90 – 1.10 | – |
| F11 Cl.1 | 0.05 – 0.15 | 0.30 – 0.60 | 0.030 max | 0.030 max | 0.50 – 1.00 | 1.00 – 1.50 | 0.44 – 0.65 | – |
| F11 Cl.2 / Cl.3 | 0.10 – 0.20 | 0.30 – 0.80 | 0.040 max | 0.040 max | 0.50 – 1.00 | 1.00 – 1.50 | 0.44 – 0.65 | – |
| F22 Cl.1 / Cl.3 | 0.05 – 0.15 | 0.30 – 0.60 | 0.040 max | 0.040 max | 0.50 max | 2.00 – 2.50 | 0.87 – 1.13 | – |
| F91 | 0.08 – 0.12 | 0.30 – 0.60 | 0.020 max | 0.010 max | 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 | 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.1 | 415 MPa (60 ksi) min | 205 MPa (30 ksi) min | 20% min | 45% min | 121 – 174 |
| F11 Cl.2 | 485 MPa (70 ksi) min | 275 MPa (40 ksi) min | 20% min | 30% min | 143 – 207 |
| F11 Cl.3 | 515 MPa (75 ksi) min | 310 MPa (45 ksi) min | 20% min | 30% min | 156 – 207 |
| F22 Cl.1 | 415 MPa (60 ksi) min | 205 MPa (30 ksi) min | 20% min | 35% min | 170 max |
| F22 Cl.3 | 515 MPa (75 ksi) min | 310 MPa (45 ksi) min | 20% min | 30% min | 156 – 207 |
| F91 | 585 MPa (85 ksi) min | 415 MPa (60 ksi) min | 20% min | 40% min | 190 – 248 |
Typical values for chrome-moly forgings (for reference)
| Property | Metric | Imperial |
|---|---|---|
| Density | 7.75 – 7.85 g/cm³ | 0.280 – 0.284 lb/in³ |
| Melting Range | 1420 – 1510 °C | 2590 – 2750 °F |
| Modulus of Elasticity | 205 – 218 GPa | 29.7 – 31.6 × 10³ ksi |
| Thermal Conductivity (100°C) | 26 – 37 W/m·K | 15.0 – 21.4 BTU/h·ft·°F |
| Mean Thermal Expansion (20–300°C) | 11.3 – 12.6 µm/m·°C | 6.3 – 7.0 µin/in·°F |
| Specific Heat | 0.46 J/g·°C | 0.11 BTU/lb·°F |
| Typical Max. Service Temperature | F11 ≈ 595 °C, F22 ≈ 600 °C, F91 ≈ 650 °C | F11 ≈ 1100 °F, F22 ≈ 1110 °F, F91 ≈ 1200 °F |
Socket weld fittings as per ASME B16.11 – Class 3000 & 6000 (mm)
| NPS | Socket Bore (B) | Socket Depth (J) min | 90° Elbow / Tee / Cross (A) – 3000 | 90° Elbow / Tee / Cross (A) – 6000 | 45° Elbow (A) – 3000 | 45° Elbow (A) – 6000 |
|---|---|---|---|---|---|---|
| 1/8" | 10.9 | 9.5 | 11.0 | 11.0 | 8.0 | 8.0 |
| 1/4" | 14.3 | 9.5 | 11.0 | 13.5 | 8.0 | 8.0 |
| 3/8" | 17.7 | 9.5 | 13.5 | 15.5 | 8.0 | 11.0 |
| 1/2" | 21.9 | 9.5 | 15.5 | 19.5 | 11.0 | 13.0 |
| 3/4" | 27.3 | 12.5 | 19.5 | 22.5 | 13.0 | 14.0 |
| 1" | 34.0 | 12.5 | 22.5 | 27.0 | 14.0 | 17.0 |
| 1 1/4" | 42.8 | 12.5 | 27.0 | 32.0 | 17.0 | 21.0 |
| 1 1/2" | 48.9 | 12.5 | 32.0 | 38.0 | 21.0 | 25.0 |
| 2" | 61.2 | 16.0 | 38.0 | 41.0 | 25.0 | 28.0 |
| 2 1/2" | 73.9 | 16.0 | 41.0 | – | 28.0 | – |
| 3" | 89.9 | 16.0 | 57.0 | – | 32.0 | – |
| 4" | 115.5 | 19.0 | 66.5 | – | 41.0 | – |
A = Centre to bottom of socket. Class 3000 fittings are used with SCH 80 pipe and Class 6000 with SCH 160 pipe. Class 6000 socket weld fittings are standardised up to 2" NB. All dimensions in mm and nominal.
Where alloy steel forged fittings are used
Drain, vent and instrument connections on main steam and reheat lines.
Small-bore piping in hydrocrackers, reformers and fired heaters.
High-temperature hydrogen and hydrocarbon service connections.
Superheater drains, sampling points and safety valve branches.
Pressure gauge, transmitter and thermowell tapping points.
Ammonia and urea plant lines needing hydrogen-attack resistance.
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 alloy steel forged fittings
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