A335 P11 Alloy Steel Seamless Pipe Description
ASTM A335 P11 is a seamless ferritic alloy-steel pipe within the chromium-molybdenum (Cr-Mo) system, engineered for high-temperature/pressure service. Its microstructure consists of tempered bainite or ferrite-pearlite (depending on heat treatment), where the controlled alloying of Cr (1.00-1.50%) and Mo (0.44-0.65%) ensures superior creep resistance and rupture strength within the 540-593°C range. Manufactured via seamless hot-finished or cold-drawn processes, the pipe requires normalization and tempering to enhance grain boundary stability. It is certified for ASME B31.1/B31.3-regulated power piping and high-temperature refinery/petrochemical pipelines.
A335 P11 Seamless Ferritic Alloy-Steel Pipe for High-Temperature Service Specifications:
| Size | 1/8" To 24" |
| Standards | ASTM A335, ASME SA335 |
| Type | Seamless |
| Outer Dimensions | 19.05mm – 114.3mm |
| Wall Thickness | 2mm – 14mm |
| Length | 6M Or As Custom, Single, Double Random & Cut to Length. |
| Schedule Chart | SCH 10 - SCH XXS |
| Shape | Round, Rectangular, Square, Hydraulic Etc. |
| Ends | Plain Ends, Beveled Ends, Treaded |
A335 P11 Standard Specification
Chemical & Mechanical Properties
| ASTM A335 P11 Chemical Composition (%) | ||||||
| C | Mn | P | S | Si | Cr | Mo |
|
0.05%~0.15% |
0.3%~0.6% | ≤0.025% |
≤0.025% |
0.5%-1.00% |
1.00%~1.5% |
0.44%~0.65% |
Mechanical Properties
| Property | Standard Value |
|---|---|
| Tensile Strength | ≥415 MPa (60 ksi) |
| Yield Strength (0.2% offset) | ≥205 MPa (30 ksi) |
| Elongation | ≥20% |
| Hardness (Brinell) | ≤197 HBW |
Permissible Variation In Wall Thickness
| NPS [DN] Designator | Tolerance, % from Specified | |
| Over | Under | |
| 1/8 to 2 1/2 [6 to 65] incl., all t/D ratios | 20.0% | 12.5% |
| Above 2 1/2 [65], t/D < or = 5% | 22.5% | 12.5% |
| Above 2 1/2 [65], t/D > 5% | 15.0% | 12.5% |
| (t = Specified Wall Thickness; D = Specified Outside Diameter) | ||
Products process
The manufacturing process of A335 P11 alloy steel pipes for nuclear power applications mainly includes the following steps:
Smelting: Using vacuum induction furnaces or electro-slag remelting furnaces to ensure high-quality molten steel.
Continuous Casting: Pouring the molten steel into a continuous caster to solidify and form steel billets.
Rolling: Subjecting the billets to multiple passes in a rolling mill to achieve the desired shape and dimensions of the pipe.
Heat Treatment: Performing high-temperature tempering on the pipes to enhance their mechanical properties and corrosion resistance.
Non-Destructive Testing (NDT): Employing ultrasonic testing, X-ray inspection, and other NDT methods to ensure the internal quality of the pipes.
Surface Treatment: Polishing, pickling, and other surface treatments to improve corrosion resistance and aesthetics.
Inspection and Storage: Inspecting qualified pipes and storing them for shipment.
This process aligns with the technical requirements of ASTM A335 P11, ensuring the pipes meet nuclear power industry standards for high-temperature and high-pressure service.
GNEE A335 P11 low alloy steel pipe in stock
FAQ
What is ASTM A335 P11 material?
ASTM A335 P11 Pipe (ASME SA335 P11) is Chrome Moly Alloy Seamless Pipe that used for high-temperature services, P11 Grade Pipe Chrome content at 1.00% to 1.50%, Moly content 0.44% to 0.65%, Minimum tensile strength 415MPa, minimum yield strength 205Mpa.
What is the ASTM A335 P11 equivalent to?
The seamless pipe of ASTM A335 P11 is a typical Cr-Mo alloy steel pipe for high-temperature service. Also known as 1.25Cr-0.5Mo, the UNS designation of ASTM A335 P11 is K11597. Its ASTM equivalent includes ASTM A369 FP11 as well as ASTM A213 T11.
What is the difference between P11 and P22 material?
Chromium and Molybdenum Content - P22 has a higher percentage of chromium and molybdenum as compared to P11, which makes it more suitable for higher-temperature applications.
What is the temperature limit for ASTM A335 P11?
In oxidizing environments: Maximum service temperatures are typically about 593°C (1100°F). In non-oxidizing environments: maximum service temperatures of approximately 650°C (1200°F) can be achieved.
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