The ASTM A335 Gr. P9 seamless tube is a chromium-molybdenum (Cr-Mo) alloy steel pipe primarily used for high-temperature service. With a nominal composition of 9% chromium and 1% molybdenum, Grade P9 offers excellent oxidation resistance and high-temperature strength, making it ideal for demanding applications in power generation, petrochemical, and refining industries.
Key Features:
1) Superior resistance to high-temperature oxidation and scaling
2) Enhanced creep strength and fatigue resistance
3) Good thermal conductivity and low thermal expansion
4) Uniform seamless structure for enhanced safety and durability
ASTM A335 Gr. P9 Chemical Composition & Mechanical Property:
Chemical Composition |
Chemical Composition, % | P5 | P9 | P11 | P22 | P91 |
C | 0.15 max | 0.15 max | 0.05-0.15 | 0.05-0.15 | 0.08-0.12 |
Mn | 030-0.60 | 0.30-0.60 | 0.30-0.60 | 0.30-0.60 | 0.30-0.60 |
P, max | 0.025 | 0.025 | 0.025 | 0.025 | 0.020 |
S, max | 0.025 | 0.025 | 0.025 | 0.025 | 0.010 |
Si | 0.50 max | 0.25-1.00 | 0.50-1.00 | 0.50 max | 0.20-0.50 |
Cr | 4.00-6.00 | 8.00-10.00 | 1.00-1.50 | 1.90-2.60 | 8.00-9.50 |
Mo | 0.45-0.65 | 0.90-1.10 | 0.44-0.65 | 0.87-1.13 | 0.85-1.05 |
Tensile Requirements | P5 | P9 | P11 | P22 | P91 |
Yield Strength (min)
MPa (psi) | 205 (29,700) | 205 (29,700) | 205 (29,700) | 205 (29,700) | 415 (60,000) |
Tensile Strength (min)
MPa (psi) | 415 (60,000) | 415 (60,000) | 415 (60,000) | 415 (60,000) | 585 (84,900) |
General information:
Standard: ASTM A335
Grade: P9
Size: OD: 21.3-609.6mm; WT: Schedule 10, 40, STD, XS, to XXS; L: SRL / DRL / Cut to length
Ends:
1) Plain ends
2) Beveled ends
3) Threaded ends
Available Coating: Bared, black painted (mill varnish), oiled, anti-corrosion coating.
Package: Hexagonal bundled with steel strips for small or medium sizes, loose packing for large diameter pipes, each bundle will not exceed 3tons. Waterproof material wrapped, wooden cases or crates for small sizes or special requirements.
Shipment: Land transportation by truck or train, sea transportation by container shipment or bulk vessel.
Hebei K-Steel Pipe Industry Our advantage:
Flexible Project Customization
We provide tailored manufacturing solutions to meet diverse project requirements, including customized outer diameter, wall thickness, and length specifications. In addition, we offer precision end preparation and a full range of anti-corrosion coating options to ensure optimal performance in various operating environments. This flexibility enables us to deliver line pipe solutions that align seamlessly with your technical and application needs.
Fast & Reliable Lead Time
With strong mill partnerships and readily available inventory resources, we are able to shorten production cycles and respond quickly to urgent project demands. Our integrated supply network ensures stable material availability, efficient scheduling, and on-time delivery — helping clients keep their projects on track without delay.
Advanced Technical & Quality Assurance
Equipped with our own metallurgical laboratories and supported by trusted third-party inspection agencies, we ensure every line pipe meets international standards and project specifications. Comprehensive testing and verification guarantee consistent mechanical properties, chemical composition, and coating integrity, providing clients with reliable, high-quality pipeline solutions.
Rapid Delivery & Complete Logistics
Leveraging fast supply capabilities and a well-established logistics network, we ensure timely delivery of line pipes to any project location. Our streamlined transportation and warehousing system minimize lead time, helping clients maintain smooth operations and meet critical project schedules.
