Metinox Overseas is a leading Alloy Steel Flanges Manufacturer in India and in particular, it deals in high-performance flanges that are used in high temperatures and high-pressure applications. We were founded in 2003 and certified under ISO 9001:2008 on the premise of our deep knowledge in metallurgy and forging processes that are needed in chromium-molybdenum steels. It is our commitment to high-quality production, and this quality of production has seen our alloy steel flanges to be of superior quality in terms of strength, creep resistance and durability in the most challenging industrial conditions.
Through our high-level manufacturing plants in Mumbai, we manufacture Alloy Steel flanges that are made per ANSI B16.5, ASME B16.47 MSS-SP44 API, AWWA-C207, DIN, BS and other international standards. Our product line of Chrome-Moly grades includes F5, F9, F91, F92 and F911 in ASTM A182. The grades have also been designed specifically to serve in power plants, refineries and petrochemical industries where the piping systems can work at extreme temperatures and pressures. We have Slip-On, Weld Neck, Blind, Threaded, Socket Weld, and Lap Joint flanges in our product line.
At Metinox Overseas, we always focus on the quality of the products. All flanges of alloy steel are subject to rigorous testing such as chemical analysis, mechanical tests, and non-destructive tests to meet ASTM standards. To have a ready supply of raw materials and finished flanges in case of urgent project needs, we have a long list of these materials. We have been a favorite supplier to our thermal power generation, petrochemical complexes, oil refineries, and fertilizer plants throughout India and beyond as a result of our experience with chromium-molybdenum alloys.
Table of Contents
Alloy Steel Flanges by Grade
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ASTM A182 F5 Flanges
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ASTM A182 F9 Flanges
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ASTM A182 F91 Flanges
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ASTM A182 F92 Flanges
ASTM A182 F911 Flanges
Alloy Steel Flanges Specification
Our Alloy Steel Flanges are manufactured to precise dimensional standards and rigorous material specifications suitable for high-temperature service.
| Specification | Details |
| Flange Types | Slip-On, Weld Neck, Blind, Threaded, Socket Weld, Lap Joint |
| Pressure Class | 150 LBS, 300 LBS, 600 LBS, 900 LBS, 1500 LBS, 2500 LBS |
| Size Range | 1/2" (15 NB) to 48" (1200 NB) |
| Face Types | Raised Face (RF), Flat Face (FF), Ring Type Joint (RTJ) |
| Standards | ANSI B16.5, ASME B16.47 Series A & B, MSS-SP44, DIN, BS |
| Temperature Range | Up to 650-C (depending on grade) |
Alloy Steel Grades We Manufacture
Metinox Overseas manufactures premium quality Alloy Steel Flanges specializing in Chromium-Molybdenum grades essential for high-temperature service.
| Grade | Applications / Features |
| ASTM A182 F5 (5Cr-0.5Mo) | Intermediate alloy steel offering good oxidation resistance and strength for refinery heaters and steam lines up to 650-C. |
| ASTM A182 F9 (9Cr-1Mo) | High-temperature grade widely used in the power industry, offering excellent corrosion resistance and mechanical properties at elevated temperatures. |
| ASTM A182 F91 (9Cr-1Mo-V) | Modified 9Cr-1Mo steel with Vanadium and Niobium, providing superior creep rupture strength. Standard for modern supercritical power plants. |
| ASTM A182 F92 (9Cr-2Mo) | Advanced alloy with Tungsten addition, offering enhanced high-temperature strength and creep resistance over F91. |
| ASTM A182 F911 (9Cr-1Mo-V-Nb) | Further improved creep resistance compared to F91, designed for critical components in thermal power generation. |
Chemical Composition
The specific alloying elements in our flanges provide the necessary heat resistance and mechanical stability. Below is the typical chemical composition:
| Grade | C | Mn | Si | P | S | Cr | Mo | Ni | V | Nb |
| F5 | 0.15 max | 0.30-0.60 | 0.50 max | 0.030 | 0.030 | 4.00-6.00 | 0.44-0.65 | 0.50 max | - | - |
| F9 | 0.15 max | 0.30-0.60 | 0.50-1.00 | 0.030 | 0.030 | 8.00-10.00 | 0.90-1.10 | 0.40 max | - | - |
| F91 | 0.08-0.12 | 0.30-0.60 | 0.20-0.50 | 0.020 | 0.010 | 8.00-9.50 | 0.85-1.05 | 0.40 max | 0.18-0.25 | 0.06-0.10 |
| F92 | 0.07-0.13 | 0.30-0.60 | 0.50 max | 0.020 | 0.010 | 8.50-9.50 | 0.30-0.60 | 0.40 max | 0.15-0.25 | 0.04-0.09 |
| F911 | 0.09-0.13 | 0.30-0.60 | 0.10-0.50 | 0.020 | 0.010 | 8.50-9.50 | 0.90-1.10 | 0.40 max | 0.18-0.25 | 0.06-0.10 |
Mechanical Properties
Our alloy steel flanges are heat treated to achieve the required mechanical properties for high-temperature service.
| Grade | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) | Hardness (HB max) |
| F5 | 415 - 585 | 275 min | 20 | 217 |
| F9 | 585 min | 380 min | 20 | 217 |
| F91 | 585 - 760 | 415 min | 20 | 248 |
| F92 | 620 - 850 | 440 min | 20 | 269 |
| F911 | 620 - 850 | 440 min | 18 | 269 |
Types of Alloy Steel Flanges
Metinox Overseas provides a variety of Alloy Steel flange design that resists thermal cycling and high stress.
Slip-On Flanges
The slip-on flanges are highly used in the lower-pressure applications where the ease of installation is a consideration.
Weld Neck Flanges
These are the choice when the piping system is in high temperature with high pressure alloy steel because they have high hub strength.
Blind Flanges
Blind flanges are used to close the end of piping systems, which are important in testing the pressure and in maintenance in power plants.
Socket Weld Flanges
Best in small-bore alloy piping in high-pressure steam lines where smooth flow is of great importance.
Threaded Flanges
These have found application where the welding is dangerous or impossible, but are rather rare in very high-temperature lines
Lap Joint Flanges
These are used on alloy stub ends that can easily be aligned with the holes of kitting bolts during installation.
Orifice Flanges
These are needed to meter the flow in high-temperature steam and hydrocarbon lines.
Long Weld Neck Flanges
This has got a long neck, which is normally employed on pipe connections to vessels or columns within the refineries.
Reducing Flanges
Creates a pipe connection between two or more sizes of pipe without an intervening reducer fitting.
Spectacle Blind Flanges
This is a device that is used to provide a positive isolation of piping sections during maintenance shutdowns in critical plants.
Application and Uses
Alloy Steel flanges can not be done away with in industries where materials to be used must perform exceptionally under heat and pressure. They find wide application in thermal power stations and in supercritical boilers, where the creep resistance is of utmost importance. These flanges are used in high-temperature lines that handle hydrocarbons in petrochemical refineries and oil and gas processing plants. They are also essential parts of steam turbines, nuclear power plants, and chemical processing reactors that have a high temperature. They contain particular amounts of chromium and molybdenum that guarantee structural integrity and resistance to oxidation and corrosion in such unpleasant conditions.
Thermal Power Stations
Supercritical boilers and high-temperature steam systems requiring superior creep resistance.
Petrochemical Refineries
High-temperature hydrocarbon processing lines in refining and petrochemical complexes.
Oil & Gas Processing
High-pressure and high-temperature piping systems for hydrocarbon transportation.
Steam Turbines
Critical components in power generation turbines operating at elevated temperatures.
Nuclear Power Plants
High-temperature applications requiring exceptional mechanical stability and durability.
Chemical Processing
High-temperature reactors with demanding oxidation and corrosion resistance requirements.
Looking for High-Quality Alloy Steel Flanges?
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Suppliers in India
Metinox Overseas supplies high-quality Alloy Steel Flanges to major industrial hubs across India, ensuring timely delivery and superior service.
| Bengaluru | Mumbai | Chennai | Hyderabad |
| Kolkata | Pune | New Delhi | Ahmedabad |
| Jaipur | Surat | Salem | Gandhinagar |
| Bhiwandi | Tiruppur | Sivakasi | Jamnagar |
| Thiruvananthapuram | Rajahmundry | Bhubaneswar | Vijaywada |
| Firozabad | Bokaro Steel City | Rajkot | Bharuch |
| Panna | Raipur | Cochin | Ludhiana |
| Panipat | Durgapur | Peenya | Pimpri-Chinchwad |
| Channapatna | Kharagpur | Nashik | Bareilly |
| Varanasi | Haldia | Rourkela | Bangalore |
| Moradabad | Indore | Visakhapatnam | Trivandrum |
| Pithampur | Dibrugarh | Angul | Gwalior |
| Coimbatore | Kannur | Nagpur | Vadodara |
| Rudrapur | Noida | Agra | Bhagalpur |
| Jamshedpur | Bhilai | Lucknow | Kanpur |
| Thane | Bhopal | Durg-Bhilai Nagar | Jabalpur |
| Lucknow | Ghaziabad |
Exporters
Metinox Overseas is a leading exporter of Alloy Steel Flanges, serving clients in over 30 countries with internationally certified products.
| Saudi Arabia | Oman | Kuwait | Bahrain |
| Qatar | UAE | Iran | Netherland |
| Nigeria | Mexico | Canada | Bangladesh |
| United States | South Africa | Malaysia | Brazil |
| Singapore | Sri Lanka | Australia | Turkey |
| Venezuela | United Kingdom | Germany | New Zealand |
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