Tubewell Steel & Engg. Co. is a leading manufacturer and stockist specializing in Alloy Steel Pipes, Tubes, Fittings and Flanges for critical industrial applications.
1.25% Chromium – 0.5% Molybdenum socket weld and threaded forged fittings for steam, boiler and refinery small-bore piping.
Tubewell Steel & Engg. Co. manufactures, stocks and supplies ASTM A182 F11 forged fittings from Mumbai, India. These 1¼Cr-½Mo socket weld and threaded fittings combine good creep strength with excellent weldability and are the standard companion for A335 P11 pipe in steam and refinery systems.
Why A182 F11 is the most widely used chrome-moly forging grade
ASTM A182 F11 is a low-alloy ferritic forging grade containing nominally 1.25% chromium and 0.5% molybdenum. Chromium provides resistance to oxidation and sulphidation, while molybdenum improves strength and creep resistance at elevated temperatures up to about 595°C (1100°F). The specification offers three strength levels – Class 1, Class 2 and Class 3 – with Class 2 being the most commonly specified for ASME B16.11 socket weld and threaded fittings.
Our F11 forged fittings are closed-die forged, CNC machined and then annealed or normalized and tempered at a minimum of 620°C (1150°F) as required by ASTM A182. Every piece is hardness tested, PMI verified and marked with grade, class, size and heat number for full traceability. Supply is backed by EN 10204 3.1 certificates, IBR documentation and third-party inspection when required.
Standard supply range for ASTM A182 F11 forged fittings
| Parameter | Details |
|---|---|
| Material Standard | ASTM A182, ASME SA182 |
| Grade | F11 Class 1 (UNS K11597), F11 Class 2 & Class 3 (UNS K11572) |
| 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 Class | Class 3000, 6000, 9000 |
| Threaded Class | Class 2000, 3000, 6000 |
| Thread Type | NPT (ASME B1.20.1), BSPT, BSPP |
| Types | 90° & 45° Elbow, Equal & Reducing Tee, Cross, Full / Half Coupling, Cap, Union, Boss, Plug, Bushing, Swage Nipple, Olets |
| Manufacturing | Closed-die forged, CNC machined |
| Heat Treatment | Annealed or Normalized & Tempered (tempering min. 620°C / 1150°F) |
| Surface Finish | Shot blasted, anti-rust oil coated |
| Marking | As per MSS SP-25 – A182 F11, class, size, heat no. |
| Testing | Hardness, PMI, Tensile, Dimensional, UT / DPT / MPI on request |
| Certificates | EN 10204 3.1 / 3.2, IBR Certificate, TPI Reports |
International equivalents of A182 F11
| Grade | ASTM | UNS | EN | W.Nr. | Nominal Alloy |
|---|---|---|---|---|---|
| F11 Class 1 | A182 F11 Cl.1 | K11597 | 13CrMo4-5 | 1.7335 | 1.25Cr – 0.5Mo |
| F11 Class 2 | A182 F11 Cl.2 | K11572 | 13CrMo4-5 | 1.7335 | 1.25Cr – 0.5Mo |
| F11 Class 3 | A182 F11 Cl.3 | K11572 | 13CrMo4-5 | 1.7335 | 1.25Cr – 0.5Mo |
Weight %, as per ASTM A182 (chips show F11 Class 2)
| Grade | C | Mn | P | S | Si | Cr | Mo |
|---|---|---|---|---|---|---|---|
| F11 Class 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 Class 2 | 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 |
| F11 Class 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 |
Minimum values at room temperature as per ASTM A182
| Grade | Tensile Strength | Yield Strength (0.2%) | Elongation | Reduction of Area | Hardness (HBW) |
|---|---|---|---|---|---|
| F11 Class 1 | 415 MPa (60 ksi) min | 205 MPa (30 ksi) min | 20% min | 45% min | 121 – 174 |
| F11 Class 2 | 485 MPa (70 ksi) min | 275 MPa (40 ksi) min | 20% min | 30% min | 143 – 207 |
| F11 Class 3 | 515 MPa (75 ksi) min | 310 MPa (45 ksi) min | 20% min | 30% min | 156 – 207 |
Typical values (for reference)
| Property | Metric | Imperial |
|---|---|---|
| Density | 7.75 g/cm³ | 0.280 lb/in³ |
| Melting Range | 1450 – 1510 °C | 2640 – 2750 °F |
| Modulus of Elasticity | 205 GPa | 29.7 × 10³ ksi |
| Thermal Conductivity (100°C) | 37 W/m·K | 21.4 BTU/h·ft·°F |
| Mean Thermal Expansion (20–300°C) | 12.4 µm/m·°C | 6.9 µin/in·°F |
| Specific Heat | 0.46 J/g·°C | 0.11 BTU/lb·°F |
| Max. Service Temperature | ≈ 595 °C | ≈ 1100 °F |
F11 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 is used with SCH 80 pipe and Class 6000 with SCH 160 pipe. All dimensions in mm and nominal; tolerances as per ASME B16.11.
Where ASTM A182 F11 forged fittings are used
Drain, vent and warm-up connections on P11 steam piping.
Small-bore lines on heaters, hydrotreaters and reformers.
Hot hydrocarbon and hydrogen service branch connections.
Header drains, sampling and safety valve branch points.
Pressure and temperature tapping points on hot lines.
Ammonia plant piping 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
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