ARK Stainless Inc. is a trusted manufacturer and supplier of high-quality Alloy Steel Flanges, crafted using advanced technology and superior-grade alloy materials to ensure exceptional strength, durability, and performance. These flanges are designed to meet the demands of high-pressure and high-temperature environments, making them ideal for a wide range of industrial applications, including petrochemical, oil and gas, power generation, and marine sectors.
Our Alloy Steel flanges are available in a variety of grades to suit specific requirements, including Alloy Steel Flanges, Alloy Steel F1 Flanges, Alloy Steel F5 Flanges, Alloy Steel F9 Flanges, Alloy Steel F11 Flanges, Alloy Steel F12 Flanges, Alloy Steel F22 Flanges, Alloy Steel F91 Flanges, and Alloy Steel F92 Flanges. These flanges are manufactured in accordance with industry standards like ASTM A105, ASTM A182, and ASME SA105, ensuring excellent mechanical properties, corrosion resistance, and long-lasting performance. We provide these flanges in various sizes, finishes, and pressure ratings to meet the needs of different applications, ensuring reliable performance in both standard and demanding conditions.
| Grade | C | Mn | P | S | Si | Ni | Cr | Mo | Cb | N |
|---|---|---|---|---|---|---|---|---|---|---|
| F1 | 0.28 | 0.60 - 0.90 | 0.045 | 0.045 | 0.15 - 0.30 | - | - | 0.44 - 0.65 | - | - |
| F5 | 0.25 | 0.60 | 0.040 | 0.030 | 0.50 | 0.50 | 4.0 - 6.0 | 0.44 - 0.65 | - | - |
| F9 | 0.15 | 0.30 - 0.60 | 0.030 | 0.030 | 0.50 - 1.00 | - | 8.0 - 10.0 | 0.90 - 1.10 | - | - |
| F11 | 0.15 | 0.30 - 0.60 | 0.030 | 0.030 | 0.50 - 1.00 | - | 1.00 - 1.50 | 0.44 - 0.65 | - | - |
| F12 | 0.05 - 0.15 | 0.30 - 0.60 | 0.045 | 0.045 | 0.50 max | - | 0.80 - 1.25 | 0.44 - 0.65 | - | - |
| F22 | 0.05 - 0.15 | 0.30 - 0.60 | 0.040 | 0.040 | 0.50 | - | 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 | 0.40 | 8.0 - 9.5 | 0.85 - 1.05 | 0.06 - 0.10 | 0.03 - 0.07 |
| F92 | 0.08 - 0.15 | 0.30 - 0.60 | 0.020 | - | 0.20 - 0.50 | - | 8.0 - 9.5 | 0.85 - 1.05 | - | - |
| Grade | Tensile Strength (MPa) min |
Yield Strength 0.2% Proof (MPa) min |
Elongation (% in 50mm) min |
Hardness | |
|---|---|---|---|---|---|
| Rockwell B (HR B) max | Brinell (HB) max | ||||
| F1 | 485 | 275 | 20 | - | 143-192 |
| F5 | 485 | 275 | 20 | - | 143-217 |
| F9 | 585 | 380 | 20 | - | 179-217 |
| F11 | 415 | 205 | 20 | - | 121-174 |
| F12 | 415 | 220 | 20 | - | 121-174 |
| F22 | 415 | 205 | 20 | - | 170 max |
| F91 | 585 | 415 | 20 | - | 248 max |
| F92 | 415 | 205 | 30 | - | - |
Alloy Steel Flanges are extensively used in numerous industries including chemical processing, power generation, defense applications, petroleum production, fertilizer plants, thermal power stations, and valve manufacturing. These flanges are engineered for high-performance environments, offering exceptional strength, durability, and resistance to corrosion and thermal stress. Their composition, which includes elements like chromium, nickel, molybdenum, and manganese, enhances their mechanical properties and enables them to withstand high temperatures and pressure conditions without compromising integrity.
To maintain superior quality and reliability, our Alloy Steel Flanges are subjected to a series of stringent tests such as hydrostatic, ultrasonic, radiography, hardness, impact, and visual inspection tests. These tests ensure the flanges meet international standards and perform effectively under challenging service conditions including high-pressure flow systems and corrosive environments.
| STANDARD | UNS | WERKSTOFF NR. |
|---|---|---|
| Alloy Steel F1 | K12822 | 1.5415 |
Alloy Steel F5 Flanges are manufactured using chromium-molybdenum alloy steel, known for their excellent rupture resistance and impressive strength-to-weight ratio due to the low carbon yet high alloy composition. These flanges exhibit superior resistance to sulfide stress corrosion cracking and are capable of withstanding hydrogen embrittlement, making them ideal for demanding industrial applications. Their ductility, toughness, and ease of weldability add to their widespread use in industries like power generation, petrochemicals, and refineries.
To ensure premium quality and performance, our Alloy Steel F5 Flanges undergo comprehensive testing procedures such as eddy current testing, hydrostatic and ultrasonic inspections, non-destructive testing (NDT), as well as chemical and mechanical property evaluations. Additional tests include Rockwell hardness, IGC (intergranular corrosion), positive material identification (PMI), flattening, flaring, and third-party inspections. These rigorous quality checks are part of our commitment to delivering highly reliable products that meet customer expectations across critical service environments.
| STANDARD | UNS | WERKSTOFF NR. |
|---|---|---|
| Alloy Steel F5 | K41545 | 1.7362 |
Alloy Steel F9 Flanges are manufactured from chromium molybdenum steel alloy, offering exceptional rupture resistance and excellent performance under high-stress applications. Thanks to their low carbon and high alloy composition, these flanges are lightweight and demonstrate excellent resistance to sulfide corrosion cracking and hydrogen embrittlement. Our F9 Threaded Flanges can be steam-cleaned and sterilized without the need for painting or additional surface finishing, making them suitable for hygienic and industrial applications alike.
These flanges are highly ductile, durable, tough, and easy to weld, making them a preferred choice in demanding industries. To ensure premium quality, our Alloy Steel F9 Flanges undergo rigorous testing including eddy current testing, hydrostatic or ultrasonic examination, and various non-destructive tests. Further assessments such as chemical analysis, Rockwell hardness testing, mechanical testing, intergranular corrosion testing, positive material identification, flattening and flaring tests, as well as third-party inspections are also conducted to ensure they meet international standards and fulfill customer expectations with reliability and consistency.
| STANDARD | UNS | WERKSTOFF NR. |
|---|---|---|
| Alloy Steel F9 | K90941 | 1.7386 |
Alloy Steel F11 Flanges are manufactured using chromium-molybdenum-based alloy steel, making them ideal for applications involving the transportation of corrosive fluids or gases at elevated temperatures. These flanges are widely used in critical industries such as power generation, chemical processing, thermal plants, and refineries due to their superior resistance to rupture and excellent mechanical performance even under extreme service conditions.
Known for their exceptional ductility, durability, and resistance to sulfide corrosion cracking and hydrogen attacks, Alloy Steel F11 Flanges offer a lightweight solution thanks to their low carbon and high alloy composition. They can be steam-cleaned and sterilized without requiring additional surface treatment or coating. To ensure top-tier quality and compliance with global standards, our F11 Flanges undergo rigorous testing processes including hydrostatic, ultrasonic, eddy current, hardness, chemical analysis, impact testing, and various non-destructive testing methods. Additional quality checks like intergranular corrosion tests, flattening and flaring tests, and third-party inspections are also carried out to ensure optimum performance and customer satisfaction.
| STANDARD | UNS | WERKSTOFF NR. |
|---|---|---|
| Alloy Steel F11 | K11597/K11572 | 1.7335 |
Alloy Steel F12 Flanges are ideal for piping systems transporting corrosive fluids or gases at high temperatures. These flanges are available in sizes ranging from 1/2" (15 NB) to 48" (1200NB). Their chromium-molybdenum steel alloy composition provides excellent rupture resistance and durability, even in harsh environments. These flanges are also resistant to sulfide corrosion cracking and hydrogen attacks, ensuring long-term performance in challenging applications.
To maintain exceptional quality and reliability, our Alloy Steel F12 Flanges undergo a series of stringent tests, including eddy current testing, hydrostatic testing, ultrasonic examination, NDT, and chemical and physical property inspections. Other tests include chemical analysis, Rockwell hardness testing, mechanical testing, intergranular corrosion testing, positive material testing, flattening tests, flaring tests, and third-party inspections. These comprehensive evaluations ensure that our flanges meet the highest international standards and perform reliably under demanding conditions.
| STANDARD | UNS | WERKSTOFF NR. |
|---|---|---|
| Alloy Steel F12 | K11562/K11564 | 1.7335 |
Alloy Steel F22 Flanges are widely recognized for their excellent mechanical strength, lightweight nature, and superior resistance to corrosion, hydrogen attack, and sulfide stress cracking. Manufactured using a chromium-molybdenum steel alloy, these flanges are ideal for high-pressure and high-temperature applications across industries such as chemical processing, power generation, petroleum production, and thermal power plants. Their low carbon and high alloy composition ensures exceptional ductility, durability, and toughness, making them suitable for critical service conditions.
To guarantee the highest quality and performance, our Alloy Steel F22 Flanges undergo a comprehensive series of tests including eddy current testing, hydrostatic testing, ultrasonic examination, chemical analysis, mechanical testing, hardness testing, intergranular corrosion testing, positive material identification (PMI), flattening and flaring tests, and third-party inspections. These stringent quality control measures ensure that our flanges meet international standards and consistently deliver reliable service even in the most demanding environments.
| STANDARD | UNS | WERKSTOFF NR. |
|---|---|---|
| Alloy Steel F22 | K21590 | 1.7380 |
Alloy Steel F91 Flanges are widely recognized for their exceptional performance in high-temperature and high-pressure applications, making them suitable for industries such as thermal power plants, petrochemicals, oil and gas, and heat exchangers. These flanges are made from a chromium-molybdenum-vanadium alloy that offers superior strength, excellent creep resistance, and outstanding resistance to oxidation and thermal fatigue.
To ensure the highest standards of durability and performance, our Alloy Steel F91 Flanges undergo extensive quality checks including hydrostatic testing, ultrasonic testing, radiographic examination, hardness testing, and impact testing. These tests confirm compliance with international specifications and verify their capability to endure critical operating conditions, including corrosive and high-pressure environments.
| STANDARD | UNS | WERKSTOFF NR. |
|---|---|---|
| Alloy Steel F91 | K90901 | 1.4903 |
Alloy Steel F92 Flanges are highly preferred for critical applications in industries such as power generation, petrochemical processing, offshore drilling, and refineries due to their superior mechanical strength and excellent resistance to high-temperature environments. These flanges are composed of a high chromium and molybdenum alloy, which enhances their ability to resist oxidation, thermal fatigue, and creep rupture under severe operating conditions.
At our facility, Alloy Steel F92 Flanges undergo a comprehensive quality assurance process including tests like ultrasonic examination, radiography, hydrostatic testing, hardness testing, and visual inspection. Additional evaluations such as chemical analysis, tensile testing, and intergranular corrosion testing ensure these flanges comply with international quality standards and deliver dependable performance even in aggressive and corrosive fluid flow systems.
| STANDARD | WERKSTOFF NR. | UNS |
|---|---|---|
| ASTM A182 F92 | - | - |
