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New Eagle Industrial Corporation is a reliable supplier of alloy steel seamless pipes, offering high-quality products manufactured in compliance with international standards. With a strong commitment to technical excellence and timely delivery.
Alloy steel seamless pipes are manufactured to withstand severe operating conditions involving elevated pressures and extreme temperatures. Produced with a homogeneous microstructure and precise dimensional control, these pipes deliver high load-bearing capacity, excellent fatigue strength, and long-term operational stability. The controlled addition of alloying elements such as chromium and molybdenum significantly improves resistance to thermal stress, oxidation, and corrosive media, ensuring consistent performance in critical services across power generation, refining, boiler systems, and petrochemical processing plants.
A broad selection of ASTM A335 alloy steel pipe grades is available, including P1, P2, P5, P9, P11, P12, P22, P91, and P92, each engineered to meet specific mechanical and metallurgical requirements. These Cr-Mo alloy grades are optimized for applications demanding high creep strength, superior tensile properties, and enhanced resistance to high-temperature deformation. Their proven reliability makes them ideal for main steam lines, high-pressure piping networks, and process systems operating under continuous thermal and mechanical loads.
Alloy Steel Seamless Pipes – Technical Specifications
Alloy Steel ASTM A312 SMLS Pipe – Chemical Composition
The following table presents the typical chemical composition of ASTM A335 alloy steel seamless pipes. The specified elemental limits are carefully controlled to ensure high strength, superior creep resistance, and reliable performance in high-temperature and high-pressure industrial applications.
| Grade | C | Mn | Si | Cr | Mo | P (max) | S (max) |
|---|---|---|---|---|---|---|---|
| P1 | 0.10–0.20 | 0.30–0.80 | 0.10–0.50 | — | 0.44–0.65 | 0.025 | 0.025 |
| P2 | 0.10–0.20 | 0.30–0.80 | 0.10–0.50 | — | 0.44–0.65 | 0.025 | 0.025 |
| P5 | max 0.15 | 0.30–0.60 | max 0.50 | 4.00–6.00 | 0.45–0.65 | 0.025 | 0.025 |
| P9 | max 0.15 | 0.30–0.60 | 0.25–1.00 | 8.00–10.00 | 0.90–1.10 | 0.025 | 0.025 |
| P11 | 0.05–0.15 | 0.30–0.60 | 0.50–1.00 | 1.00–1.50 | 0.44–0.65 | 0.025 | 0.025 |
| P12 | max 0.15 | 0.30–0.60 | 0.50–1.00 | 0.80–1.25 | 0.44–0.65 | 0.025 | 0.025 |
| P22 | max 0.15 | 0.30–0.60 | max 0.50 | 1.90–2.60 | 0.87–1.13 | 0.025 | 0.025 |
| P91 | max 0.12 | 0.30–0.60 | 0.20–0.50 | 8.00–9.50 | 0.85–1.05 | 0.020 | 0.010 |
| P92 | max 0.10 | 0.30–0.60 | max 0.50 | 8.50–9.50 | 1.50–2.00 | 0.020 | 0.010 |
Chrome-Moly Alloy Steel Seamless Pipes – Mechanical Properties
The table presents the typical mechanical properties of ASTM A335 alloy steel seamless pipes. It highlights key parameters such as yield strength, tensile strength, elongation, and hardness, ensuring reliable performance in high-pressure, high-temperature, and critical industrial applications like power plants, refineries, and petrochemical systems.
| Grade | Minimum Yield Strength (MPa) | Minimum Tensile Strength (MPa) | Elongation (%) | Hardness (HB) |
|---|---|---|---|---|
| P1 | 205 | 415 | 22 | 140–180 |
| P2 | 205 | 415 | 22 | 140–180 |
| P5 | 205 | 415 | 22 | 140–180 |
| P9 | 205 | 415 | 22 | 140–180 |
| P11 | 205 | 415 | 22 | 140–180 |
| P12 | 205 | 415 | 22 | 140–180 |
| P22 | 240 | 415 | 20 | 170–210 |
| P91 | 450 | 600 | 20 | 200–250 |
| P92 | 450 | 650 | 20 | 220–260 |
High Pressure Alloy Steel Piping – Equivalent Grades
The table shows the international equivalent grades for ASTM A335 alloy steel seamless pipes, covering EN/DIN, JIS, GOST, and UNS standards. These equivalents help engineers and procurement teams select the right material for high-temperature, high-pressure, and critical industrial applications worldwide.
| ASTM A335 Grade | EN / DIN | JIS | GOST / Russian Standard | UNS |
|---|---|---|---|---|
| P1 | 16Mo3 | STPA1 | 15Мo | WNr 1.0401 |
| P2 | 16Mo3 | STPA2 | 15Мo | WNr 1.0401 |
| P5 | 13CrMo44 / 12Cr1MoV | STPA5 | 12Х1МФ | WNr 1.7335 |
| P9 | 10CrMo9-10 | STPA9 | 10Х9МФБ | WNr 1.7380 |
| P11 | 12Cr1MoV | STPA11 | 12Х1МФ | WNr 1.7335 |
| P12 | 12Cr1MoV | STPA12 | 12Х1МФ | WNr 1.7335 |
| P22 | 2.25Cr-1Mo | STPA22 | 12Х2МФБ | WNr 1.7383 |
| P91 | X10CrMoVNb9-1 | STPA91 | 15Х1М1Ф | WNr 1.4903 |
| P92 | X12CrMoWVNbN10-1 | STPA92 | 15Х2МФБ | WNr 1.4901 |
What is the difference between P22, P91, and P92?
P22:
- Chromium-Molybdenum (Cr-Mo) alloy.
- Suitable for moderate temperatures up to 550°C.
- Used in boilers, heat exchangers, and power plant piping.
P91:
- High Cr-Mo-V alloy.
- Designed for high temperatures up to 600°C.
- Ideal for superheaters, reheaters, and high-pressure steam lines.
P92:
- Advanced high-strength Cr-Mo-V-N alloy.
- Performs at ultra-high temperatures up to 650°C.
- Used in ultra-supercritical power plants and critical high-pressure systems.
What is the advantage of seamless construction?
Seamless pipes provide:
- Uniform mechanical and chemical properties
- High resistance to pressure and stress
- Better performance under thermal cycling
- Long-term durability in critical systems
How are alloy steel seamless pipes supplied?
- Hot-finished or normalized condition for superior toughness
- Cut-to-length or full standard lengths as per project requirements
- Compliance with third-party inspection, including PMI (Positive Material Identification), hydrostatic testing, and dimensional checks
Global Export Network for Alloy steel SMLS Pipes
As a trusted manufacturer and exporter, New Eagle Steel supplies A312 Alloy Steel seamless pipes globally. Our high-performance products are widely used in chemical processing, pollution control, marine, and pharmaceutical industries across Europe, the Middle East, Asia, and the Americas, ensuring exceptional corrosion resistance, reliability, and precision engineering.
- Middle East: United Arab Emirates (UAE), Saudi Arabia, Qatar, Kuwait, Oman, Bahrain, Yemen, Iran, Iraq, Israel, Jordan, Lebanon, Syria, Turkey
- North Africa: Egypt, Algeria, Morocco, Tunisia, Libya
- Asia Pacific: Singapore, Malaysia, Vietnam, Indonesia, Thailand, Philippines, Cambodia, Laos, Myanmar, Brunei, Timor-Leste, Taiwan, Japan, South Korea
- Europe: Spain, Belgium, Netherlands, France, Germany, Italy, United Kingdom (England), Poland, Cyprus, Malta, Russia
- Americas: Brazil, Mexico, Chile, Peru, Colombia, Argentina, United States (USA), Canada
- India: Chennai, Coimbatore, Bangalore, Thiruvananthapuram, Pune, Kolkata, Kerala, Karnataka, Gujarat, Mumbai, Delhi
Applications of Alloy Steel ASTM A312 Seamless Pipes Across Industries
Oil & Gas Industry
Petrochemical & Chemical Processing
Power Generation (Thermal, Nuclear & Renewable)
Marine & Offshore Engineering
Pharmaceuticals & Biotechnology
Food, Beverage & Dairy Processing
Pulp & Paper Industry
Aerospace & Defense
Automotive & Transportation
Instrumentation & Control Systems
Water Treatment & Desalination
HVAC & Heat Exchanger Systems
Construction & Infrastructure Projects
Mining & Metallurgy
