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Alloy Steel Chrome Moly Flanges Manufacturer and Supplier in India
The Alloy Steel Chrome Moly Flanges are forged pipe fittings made from alloy steel with chromium molybdenum. This piping product exhibits the strength and ability to withstand extreme temperatures and pressures in industrial applications. The most common grades of these flanges are ASTM A182 F5, F9, F11, F22, and F91. The grades are chosen based on their chemical makeup and mechanical properties. They are extensively used in thermal power plants, oil refineries, petrochemical plants, and steam pipes that require high temperatures. The alloy steel chrome moly flanges come in different pressure rating, sizes, and faces and should conform to the relevant specifications for materials and heat treatment. Solitaire Overseas is one of the leading manufacturers and suppliers of alloy steel chrome moly flanges in India.
Technical Data
Specifications of Alloy Steel Chrome Moly Flanges
| Specification Parameter | Standard Technical Specification |
|---|---|
|
Material Specification |
ASTM A182 / ASME SA182 (Forged or Rolled Alloy Steel Pipe Flanges, Fittings, Valves, and Parts for High-Temperature Service) |
|
Primary Material Grades |
ASTM A182 F5, F9, F11 (Class 2), F12 (Class 2), F22 (Class 3), F91 (Note: Grade F1 is a C-Mo steel containing 0% Cr and is listed separately under C-Mo products). |
|
Size Range |
ASME B16.5:1/2"NB to 24"NB ASME B16.47 (Series A & B):26"NB to 60"NB |
|
Manufacturing & Dimensional Standards |
ASME / ANSI: B16.5, B16.47 (Series A & B), B16.36 (Orifice Flanges) EN / DIN: EN 1092-1 Type 01/11/02/05, DIN 2501, DIN 2633/2634/2635 JIS / KS: JIS B2220 (5K to 30K), KS 1503 GOST: GOST 12820-80, GOST 12821-80 SANS / SABS: SANS 1123 / SABS 1123 |
|
Heat Treatment Condition |
Normalized & Tempered (N+T) per ASTM A182 requirements |
|
Gasket Compatibility |
Spiral Wound Gaskets (Graphite / Mica / Phlogopite Fillers), Solid Metallic RTJ Rings (Soft Iron, F5, 304/316), Flat Ring / Full Face Gaskets |
|
Marking & Traceability |
Die-stamped on outer rim per ASME B16.5 / B16.47: • Manufacturer Name / Logo • Nominal Pipe Size (NPS) & Bore Wall Schedule • Pressure Class & Flange Facing • Material Grade & Heat / Melt Number • Standard Designation (e.g., ASME B16.5 A182-F22 Cl.3) |
|
Testing & Quality Verification |
Positive Material Identification (100% PMI), Hardness Survey, Mechanical Tensile/Yield & Impact Testing, Ultrasonic Testing (UT), Magnetic Particle Inspection (MPI) |
|
Certification & Documentation |
Certified Material Test Report (CMTR) to EN 10204 Type 3.1 as standard (Type 3.2 Third-Party Inspection on request) |
Chemical Compositions of Alloy Steel Chrome Moly Flanges
| ASTM Grade | UNS Number | Carbon (C) | Manganese (Mn) | Phosphorus (P) Max | Sulfur (S) Max | Silicon (Si) | Chromium (Cr) | Molybdenum (Mo) | Micro-Alloying Additions |
|---|---|---|---|---|---|---|---|---|---|
|
F5 |
K41545 |
0.15 max |
0.30–0.60 |
0.030 |
0.030 |
0.50 max |
4.00–6.00 |
0.44–0.65 |
Ni: 0.50 max |
|
F9 |
K90941 |
0.15 max |
0.30–0.60 |
0.030 |
0.030 |
0.50–1.00 |
8.00–10.00 |
0.90–1.10 |
Ni: 0.50 max |
|
F11 Class 2 |
K11572 |
0.10–0.20 |
0.30–0.80 |
0.040 |
0.040 |
0.50–1.00 |
1.00–1.50 |
0.44–0.65 |
— |
|
F12 Class 2 |
K11564 |
0.10–0.20 |
0.30–0.80 |
0.040 |
0.040 |
0.10–0.60 |
0.80–1.25 |
0.44–0.65 |
— |
|
F22 Class 3 |
K21590 |
0.05–0.15 |
0.30–0.60 |
0.040 |
0.040 |
0.50 max |
2.00–2.50 |
0.87–1.13 |
— |
|
F91 |
K91560 |
0.08–0.12 |
0.30–0.60 |
0.020 |
0.010 |
0.20–0.50 |
8.00–9.50 |
0.80–1.05 |
V: 0.18–0.25, Nb: 0.06–0.10, N: 0.03–0.07, Ni: 0.40 max, Al: 0.02 max |
Mechanical Properties of Alloy Steel Chrome Moly Flanges
| ASTM Grade | Heat Treatment Condition | Tensile Strength, Min [MPa (ksi)] | Yield Strength (0.2% Offset), Min [MPa (ksi)] | Elongation in 2 in. (50 mm), Min (%) | Reduction of Area, Min (%) | Brinell Hardness Maximum (HBW) |
|---|---|---|---|---|---|---|
|
F5 |
Normalized & Tempered |
485 MPa (70 ksi) |
275 MPa (40 ksi) |
20% |
35% |
217 HBW |
|
F9 |
Normalized & Tempered |
585 MPa (85 ksi) |
380 MPa (55 ksi) |
20% |
40% |
217 HBW |
|
F11 Class 2 |
Normalized & Tempered |
485 MPa (70 ksi) |
275 MPa (40 ksi) |
20% |
30% |
207 HBW |
|
F12 Class 2 |
Normalized & Tempered |
485 MPa (70 ksi) |
275 MPa (40 ksi) |
20% |
30% |
207 HBW |
|
F22 Class 3 |
Normalized & Tempered |
515 MPa (75 ksi) |
310 MPa (45 ksi) |
20% |
30% |
207 HBW |
|
F91 |
Normalized & Tempered |
585 MPa (85 ksi) |
415 MPa (60 ksi) |
20% |
40% |
248 HBW |
Equivalent Grades of Alloy Steel Chrome Moly Flanges
| ASTM A182 Flange Grade | UNS Number | ASTM A335 Pipe Grade | ASTM A213 Tube Grade | ASTM A387 Plate Grade | EN / DIN Steel Name | EN / DIN Material Number |
|---|---|---|---|---|---|---|
|
ASTM A182 F5 |
K41545 |
ASTM A335 P5 |
ASTM A213 T5 |
ASTM A387 Gr. 5 |
X11CrMo5 |
1.7362 |
|
ASTM A182 F9 |
K90941 |
ASTM A335 P9 |
ASTM A213 T9 |
ASTM A387 Gr. 9 |
X12CrMo9-1 |
1.7386 |
|
ASTM A182 F11 Cl. 2 |
K11572 |
ASTM A335 P11 |
ASTM A213 T11 |
ASTM A387 Gr. 11 |
13CrMo4-5 |
1.7335 |
|
ASTM A182 F12 Cl. 2 |
K11564 |
ASTM A335 P12 |
ASTM A213 T12 |
ASTM A387 Gr. 12 |
15CrMo5 |
1.7338 |
|
ASTM A182 F22 Cl. 3 |
K21590 |
ASTM A335 P22 |
ASTM A213 T22 |
ASTM A387 Gr. 22 |
10CrMo9-10 |
1.7380 |
|
ASTM A182 F91 |
K91560 |
ASTM A335 P91 |
ASTM A213 T91 |
ASTM A387 Gr. 91 |
X10CrMoVNb9-1 |
1.4903 / 1.4906 |
Applications and Industrial Uses of Alloy Steel Chrome Moly Flanges
- Thermal Power Plant Main Steam Piping
- Boiler Superheater and Reheater Connections
- Petroleum Refinery Hydrocracking Units
- Catalytic Reforming Process Piping
- High-Temperature Hydrogen Processing Lines
- Steam Turbine Inlet and Outlet Piping
- Ethylene Cracking Furnace Systems
- Heat Recovery Steam Generator (HRSG) Piping Systems
Frequently Asked Questions
An alloy steel chrome moly flange is a forged piping component made from chromium-molybdenum steel for high-pressure and high-temperature applications.
Chrome moly is a trade term for the chromium-molybdenum family, not a specification. It covers ASTM A182 grades from F11 at 1.25Cr-0.5Mo up to F91 at 9Cr-1Mo-V. Alloy steel is the broader category, which also includes nickel and other alloy systems. A purchase order should always name an ASTM grade rather than the trade term.
ASTM A182 (ASME SA182) covers forged alloy steel flanges for high-temperature service, including grades F5, F9, F11, F12, F22, and F91.
F22 is a forged alloy steel grade used for flanges and fittings under ASTM A182, while P22 is a pipe grade covered by ASTM A335. Both have similar chromium-molybdenum compositions.
AISI 4130 and 4140 are mainly used for mechanical components. Pressure-retaining flanges generally require suitable grades specified under standards such as ASTM A182.
PWHT may be required after welding to reduce residual stresses and control hardness. Requirements depend on the material grade, thickness, welding procedure, and applicable code.