ARK Stainless Inc. is a renowned manufacturer and exporter of high-performance Alloy Steel Pipes & Tubes, meticulously engineered to meet the stringent requirements of high-pressure and high-temperature applications. Known for their outstanding mechanical strength and resistance to thermal fatigue, these pipes and tubes are ideal for use in challenging environments across a wide range of industries.
We offer an extensive range of Alloy Steel grades, including P5, P9, P11, P12, P22, P91, and P92, each offering unique properties suited for specific industrial applications. These alloy grades are composed of elements like chromium, molybdenum, and vanadium, providing excellent strength, oxidation resistance, and creep resistance. Whether you're dealing with extreme heat or corrosive chemicals, our alloy steel pipes and tubes maintain structural integrity and long-term performance.
Manufactured in compliance with international standards such as ASTM A335 for seamless ferritic alloy steel pipe and ASTM A213 for alloy steel tubes, our products are available in a variety of forms including seamless, ERW, welded, and fabricated. These pipes and tubes are widely utilized in industries like power plants, refineries, boilers, heat exchangers, and chemical processing.
Our Alloy Steel Pipes & Tubes are offered in a range of sizes, thicknesses, and lengths to suit specific project requirements. We also provide various end finishes such as plain, beveled, and threaded ends, along with customized packaging to ensure safe and efficient delivery. With features such as high tensile strength, wear resistance, and superior performance under extreme conditions, ARK Stainless Inc. ensures you receive the best value in alloy steel piping solutions.
| Grade | C% | Mn% | Si% | Cr% | Mo% | V% | Ni% | Others |
|---|---|---|---|---|---|---|---|---|
| P5 | 0.15 max | 0.30–0.60 | 0.50 max | 4.00–6.00 | 0.45–0.65 | — | — | — |
| P9 | 0.15 max | 0.30–0.60 | 0.25–1.00 | 8.00–10.00 | 0.90–1.10 | — | — | — |
| P11 | 0.05–0.15 | 0.30–0.60 | 0.50–1.00 | 1.00–1.50 | 0.44–0.65 | — | — | — |
| P12 | 0.05–0.15 | 0.30–0.61 | 0.50 max | 0.80–1.25 | 0.44–0.65 | — | — | — |
| P22 | 0.05–0.15 | 0.30–0.60 | 0.50 max | 1.90–2.60 | 0.87–1.13 | — | — | — |
| P91 | 0.08–0.12 | 0.30–0.60 | 0.20–0.50 | 8.00–9.50 | 0.85–1.05 | 0.18–0.25 | 0.40 max | Nb: 0.06–0.10, N: 0.03–0.07 |
| P92 | 0.07–0.13 | 0.30–0.60 | 0.20–0.50 | 8.50–9.50 | 0.30–0.60 | 0.15–0.25 | 0.40 max | Nb: 0.04–0.09, N: 0.03–0.07, W: 1.50–2.00 |
| Grade | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) | Hardness (HB) |
|---|---|---|---|---|
| P5 | 415 min | 205 min | 30 min | 163 max |
| P9 | 415 min | 205 min | 30 min | 163 max |
| P11 | 415 min | 205 min | 30 min | 163 max |
| P12 | 415 min | 205 min | 30 min | 163 max |
| P22 | 415 min | 205 min | 30 min | 163 max |
| P91 | 585 min | 415 min | 20 min | 250 max |
| P92 | 620 min | 440 min | 20 min | 250 max |
Alloy Steel P5 Pipes & Tubes are extensively used across a wide range of critical industries such as oil and gas, petrochemical, power generation, chemical processing, thermal plants, refineries, offshore drilling, and heat exchangers. Known for their high mechanical strength, excellent oxidation resistance, and ability to perform under high-temperature and high-pressure environments, these pipes and tubes are a preferred choice for challenging applications.
These Alloy Steel P5 Pipes & Tubes offer superior resistance to various forms of corrosion including pitting, crevice corrosion, and stress corrosion cracking. Their robust composition ensures durability in aggressive conditions such as high annealing temperatures, corrosive atmospheres, and chloride-containing environments. They are ideal for transporting hot liquids and gases without compromising structural integrity.
To ensure exceptional quality and performance, each batch of Alloy Steel P5 Pipes & Tubes undergoes stringent testing, including mechanical testing, flaring test, flattening test, hydrostatic testing, hardness test, macro and micro examination, radiographic inspection, and ultrasonic testing. These tests confirm compliance with international standards and customer specifications.
| STANDARD | Werkstoff /DIN | UNS | EN |
|---|---|---|---|
| A335 Grade P5 | 1.7362 | K41545 | X11CrMo5 |
Alloy Steel P9 Pipes & Tubes are widely used in critical applications across power plants, chemical processing, oil refineries, gas processing units, heat exchangers, and high-temperature service lines. Engineered for superior strength and exceptional thermal stability, these pipes and tubes are known for their outstanding performance under extreme pressure and temperature conditions.
With excellent resistance to oxidation, high-temperature creep, and various forms of corrosion such as pitting and stress corrosion cracking, Alloy Steel P9 Pipes & Tubes ensure reliability and long service life in aggressive environments. Their robust chemical composition makes them suitable for transporting fluids in demanding industrial settings, especially where thermal and mechanical stress is prevalent.
To guarantee top-tier quality and operational efficiency, each Alloy Steel P9 pipe and tube undergoes comprehensive quality control and testing procedures, including hydrostatic testing, flaring and flattening tests, mechanical testing, hardness testing, ultrasonic testing, radiographic examination, and both macro and micro analysis. These tests validate compliance with industry standards and client-specific requirements.
| STANDARD | Werkstoff /DIN | UNS | EN |
|---|---|---|---|
| A335 Grade P9 | 1.7386 | S50400 | X11CrMo9-1 |
Alloy Steel P11 Pipes & Tubes are highly preferred in critical sectors such as power plants, refineries, petrochemical units, boiler manufacturing, and heat exchangers due to their excellent performance in high-temperature and high-pressure environments. These pipes and tubes are known for their remarkable strength, thermal stability, and resistance to wear, making them an ideal solution for transporting fluids in harsh industrial conditions.
Designed for durability and efficiency, Alloy Steel P11 Pipes & Tubes offer excellent corrosion resistance, particularly against oxidation, pitting, crevice corrosion, and stress corrosion cracking. Their robust chemical composition ensures structural integrity even in chloride-laden and elevated-temperature environments, which are typical in steam piping and heater systems.
Each batch of Alloy Steel P11 Pipes & Tubes undergoes stringent quality assurance and testing processes including hydrostatic testing, mechanical testing, flaring and flattening tests, hardness tests, macro and micro examination, ultrasonic inspection, and radiographic evaluation. These procedures ensure compliance with international standards and application-specific requirements.
| STANDARD | Werkstoff /DIN | UNS | EN |
|---|---|---|---|
| A335 Grade P11 | 1.7335 | K11597 | 13CrMo4-5 |
Alloy Steel P12 Pipes & Tubes are specifically designed to perform efficiently under high-temperature service conditions, making them suitable for applications in power generation, refineries, petrochemicals, boiler systems, heat exchangers, and thermal plants. These pipes and tubes offer excellent strength and durability, maintaining mechanical stability even in extreme thermal environments.
Known for their outstanding resistance to oxidation, creep rupture, and thermal fatigue, Alloy Steel P12 Pipes & Tubes also provide effective resistance to various forms of corrosion, including pitting, crevice, and stress corrosion cracking. Their unique chemical composition ensures safe and long-term transport of high-temperature steam and fluids without deformation or performance degradation.
Every batch of Alloy Steel P12 Pipes & Tubes undergoes rigorous quality assurance testing, including mechanical testing, flaring and flattening tests, hardness tests, hydrostatic testing, macro and micro examination, ultrasonic inspection, and radiographic evaluation. These quality checks ensure compliance with international standards and customer-specific requirements.
| STANDARD | Werkstoff /DIN | UNS | EN |
|---|---|---|---|
| A335 Grade P12 | 1.7338 | K11562 | 13CrMo4-4 |
Alloy Steel P22 Pipes & Tubes are widely recognized for their exceptional performance in high-temperature and high-pressure environments. Commonly used in thermal power plants, oil and gas refineries, heat exchangers, boiler systems, and chemical processing units, these pipes and tubes are known for their strength, durability, and resistance to thermal fatigue.
These pipes offer excellent resistance to oxidation, corrosion, and creep, making them ideal for transporting hot gases and fluids under extreme operating conditions. The chromium and molybdenum composition in Alloy Steel P22 ensures enhanced resistance to corrosion, thermal stress, and deformation, while maintaining long service life even in aggressive atmospheres.
To maintain superior quality and reliability, each Alloy Steel P22 pipe and tube undergoes comprehensive testing, including mechanical testing, flaring and flattening tests, hardness testing, hydrostatic testing, ultrasonic inspection, radiographic evaluation, and macro/micro examinations. These rigorous procedures ensure compliance with international quality standards and client specifications.
| STANDARD | Werkstoff /DIN | UNS | EN |
|---|---|---|---|
| A335 Grade P22 | 1.7380 | K21590 | 10CrMo9-10 |
Alloy Steel P91 Pipes & Tubes are highly preferred in industries that demand high-performance materials capable of withstanding extreme conditions, such as thermal power plants, nuclear plants, refineries, and high-pressure steam pipelines. These pipes and tubes are formulated with chromium, molybdenum, and vanadium to offer superior strength, excellent creep resistance, and outstanding durability at elevated temperatures.
Known for their exceptional mechanical properties, Alloy Steel P91 Pipes & Tubes provide excellent resistance to oxidation, corrosion, and thermal fatigue. Their high tensile strength and long service life make them ideal for applications where thermal stress and high-pressure flow are constant factors. These pipes are also valued for their weldability and stable performance under cyclic loading conditions.
Each P91 pipe and tube undergoes a rigorous quality assurance process, including hardness testing, mechanical testing, hydrostatic testing, ultrasonic and radiographic inspection, macro and micro structural analysis, flaring, flattening, and other destructive and non-destructive tests to meet ASTM A335 and ASME SA335 standards, ensuring compliance with industry specifications and customer requirements.
| STANDARD | Werkstoff /DIN | UNS | EN |
|---|---|---|---|
| A335 Grade P91 | 1.4903 | K91560 | X10CrMoVNb9-1 |
Alloy Steel P92 Pipes & Tubes are engineered for applications requiring superior strength, excellent thermal stability, and resistance to high-temperature corrosion. These pipes and tubes are primarily used in ultra-supercritical and supercritical boiler systems, power generation, nuclear reactors, chemical plants, and oil refineries due to their outstanding performance under extreme operating conditions.
Made from a unique blend of chromium, molybdenum, and tungsten with small additions of vanadium and niobium, Alloy Steel P92 offers enhanced creep strength, fatigue resistance, and excellent oxidation resistance even at elevated temperatures. These attributes make it ideal for high-pressure and high-temperature service environments.
Each batch of Alloy Steel P92 Pipes & Tubes is subject to a strict quality assurance process that includes ultrasonic testing, radiographic inspection, hardness testing, hydrostatic testing, mechanical testing, and macro/micro structural analysis. These quality control measures ensure adherence to ASTM A335 and ASME SA335 standards and deliver a product that meets both international norms and client-specific demands.
| STANDARD | Werkstoff /DIN | UNS | EN |
|---|---|---|---|
| A335 Grade P92 | 1.4901 | K92460 | X10CrWMoVNb9-2 |
