Product Description
When customers contact Jiangsu Cunrui Metal Products Co., Ltd. to inquire about high-temperature and high-pressure pipeline materials, ASTM A335 P92 alloy pipes are often one of the top recommended high-end options for us. In many practical projects - especially those where the temperature exceeds 600°C and requires long-term resistance to creep and oxidation - traditional Cr-Mo alloy steels (such as P22, P91) will soon reach their performance limits. Usually, P92 becomes a more economically viable choice for engineering purposes.
What is ASTM A335 P92 alloy pipe?
ASTM A335 P92 is a ferritic seamless alloy steel pipe. It is designed specifically for critical high-temperature and high-pressure working conditions such as ultra-supercritical thermal power plants through a combination of solid solution strengthening and precipitation strengthening. Its typical composition and functions are as follows:
Chromium (Cr 8.5–9.5%): Provides high-temperature oxidation resistance and resistance to steam oxidation.
Molybdenum (Mo 0.3–0.6%) + Tungsten (W 1.5–2.0%): Compressive solid solution strengthening, significantly enhancing the high-temperature creep strength
Boron (0.001–0.006%): Trace amounts of boron are concentrated at the grain boundaries, inhibiting creep cavitation and extending the durability life.
Unlike P91, P92 is based on the 9Cr-1Mo-V-Nb matrix of P91 and incorporates tungsten and boron. Based on our supply experience, customers typically choose this grade when they require higher design temperatures and longer creep life - it is highly suitable for main steam pipes, high-temperature reheating pipes, and header connection pipes.
At Jiangsu Cunrui Metal Products Co., Ltd, we supply P92 seamless pipes that comply with ASTM A335/ASME SA335 standards, and offer custom-cutting services, supporting complete furnace number traceability and precise size control. Whether you are manufacturing ultra-supercritical boiler units at 620°C, high-temperature and high-pressure process pipelines, or other critical high-temperature components, our P92 alloy pipes can provide reliable creep strength and long-term operational stability.
Do you need a quotation or a sample of the warranty certificate? Please contact us to obtain fast and compliant supply services.
Chemical composition (wt%, smelting analysis, in accordance with ASTM A335)
| Grade | C | Mn | P max | S max | Si | Cr | Mo | Others |
|---|---|---|---|---|---|---|---|---|
| P92 | 0.07–0.13 | 0.30–0.60 | 0.020 | 0.010 | ≤0.50 | 8.50–9.50 | 0.30–0.60 | W 1.5–2.00 B 0.001–0.006 V 0.15–0.25 Nb 0.04–0.09 |
Room temperature mechanical properties (minimum value, longitudinal specimen, in accordance with ASTM A335)
| Grade | Tensile Strength (ksi) | Tensile Strength (MPa) | Yield Strength (ksi) | Yield Strength (MPa) |
|---|---|---|---|---|
| P92 | 85 | 585 | 60 | 415 |
Typical Elongation: ≥ 20% (Longitudinal, 4D gauge length)
Physical Properties (Room Temperature, Normalized & Tempered Condition)
| Density | Melting Range | Thermal Conductivity | Specific Heat | Electrical Resistivity | Coefficient of Thermal Expansion (20–300°C) | Modulus of Elasticity |
|---|---|---|---|---|---|---|
| 7.80 g/cm³ | Approx. 1420 °C | Approx. 26 W/m·K | Approx. 460 J/kg·K | Approx. 0.55 μΩ·m | Approx. 11.5 μm/m·°C | Approx. 210 GPa |
Performance characteristics of ASTM A335 P92 alloy pipes
1.Excellent high-temperature creep strength
P92, by adding tungsten and boron to P91, has a creep fracture strength within the range of 600–625°C that is approximately 15–20% higher than that of P91. Under the same design life, thinner wall thicknesses can be used, thereby reducing the weight of the pipeline, and lowering the difficulty of welding and manufacturing.
2.Excellent resistance to steam oxidation
The approximately 9% chromium content enables P92 to form a dense chromium oxide protective layer in high-temperature water vapor environments. In several ultra-supercritical power plant projects we supply, the surface oxide scale thickness and shedding tendency of P92 pipes after long-term operation are significantly better than those of traditional low-chromium alloy steels.
Stable microstructure and mechanical properties
3.P92 achieves a stable tempered martensite structure through precise normalizing + reheat heat treatment, and diffusely precipitates V/Nb carbide nitrides and W-rich Laves phases. This structure exhibits excellent microstructural stability during long-term high-temperature service, avoiding the rapid microstructural degradation commonly seen in traditional ferritic steels.
4.Acceptable processing and welding properties
Compared to austenitic stainless steel, P92, as a ferritic heat-resistant steel, has a thermal expansion coefficient and thermal conductivity that are closer to those of commonly used low-alloy steels, which is beneficial for reducing thermal stress. After welding, with strict preheating (200–250°C) and post-weld heat treatment (730–770°C), it is possible to obtain weld joints with matching properties. We can provide recommended welding procedure specifications (WPS) based on actual furnace numbers for reference.
Our Company & Factory&Available specifications
Jiangsu Cunrui Metal Products Co., Ltd. is a professional manufacturer specializing in the production and export of carbon steel pipes, with a large-scale factory covering an area of over 20,000 square meters. Our factory is equipped with advanced production lines, including hot rolling, cold drawing and seamless pipe production equipment, with an annual output of more than 80,000 tons. We have a professional team of engineers, technicians and quality inspectors, who have rich experience in the steel pipe industry and are committed to providing customers with high-quality products and services.
| Parameter | Details |
|---|---|
| Standard | ASTM A335 / ASME SA335 |
| Grade / Material | Grade P92 |
| Product Form | Seamless Round Pipe |
| Outer Diameter Range | 21.3 mm – 914 mm (extendable up to ~1067 mm) |
| Wall Thickness Range | Sch 40, Sch 80, Sch 120, Sch 160, XXS, and custom (up to ~80 mm) |
| Length | Standard 3 / 6 / 9 / 12 m; cut-to-length available |
| Delivery Condition | Normalized (1040–1080°C) + Tempered (730–800°C) |
| Surface Finish | Pickled (hot-rolled) / Turned (cold-drawn) |
| Service Temperature | Recommended for long-term structural service up to ≤ 625°C |
We offer various specifications of P92 alloy pipes, including:
- Seamless round pipes, with various wall thickness series
- Customizable diameter and length
- Hot rolling or normalizing + tempering state
All materials are available for supply:
- Factory Warranty Certificate (MTC)
- Chemical composition report (by furnace number)
- Verification of mechanical properties at room temperature and high temperatures
Based on our export experience, we are well aware that for international engineering projects, complete traceability documents are just as important as the materials themselves.
Application fields of ASTM A335 P92 alloy pipes
Jiangsu Cunrui Metal Products Co., Ltd.,
we regularly supply P92 alloy pipes to customers in the following fields:
- Ultra-supercritical thermal power generation
Main steam pipeline, high-temperature reheating pipeline, high-pressure bypass pipeline and boiler header connection pipe
- Advanced supercritical unit (620°C grade)
As a key material for units in the 600–625°C range, it replaces P91 or austenitic stainless steel
- Industrial high-temperature process pipelines
Some of the high-temperature and high-pressure hydrogen-containing pipelines in petrochemical plants
- Research on future 650°C grade units
To provide basic material research and application data support for units with higher parameters
In these applications, the primary concerns of the customers are usually the long-term high-temperature creep life and the oxidation resistance, rather than the short-term strength.
Why did you choose the P92 alloy pipe instead of P91 or other materials?
We are often asked a question: "Why not use P91 or a cheaper Cr-Mo steel?"
Based on practical experience, when the following situations occur, P92 is the better choice:
- The design temperature remained continuously above 590°C, and even reached around 620°C.
- Long-term creep life is a key design parameter.
- A thinner wall thickness is required to reduce thermal stress and the weight of the pipeline.
- Upgrade the unit parameters based on P91, but have concerns about replacing them with expensive and highly thermally expansive austenitic stainless steel.
We once encountered a situation where the client initially chose the P91 design, but the pipeline lifespan did not meet the requirements after the parameter improvement. After switching to P92, it was able to meet the higher temperature and pressure requirements with a similar outer diameter and wall thickness, and avoided the thermal stress and cost issues caused by replacing the entire line with stainless steel.
Our supply experience
At Jiangsu Cunrui Metal Products Co., Ltd., we have supplied ASTM A335 P92 alloy pipes to multiple ultra-supercritical power plant projects both domestically and internationally. We have over 10 years of experience in material supply and technical cooperation. Our focus is not only on delivering materials that meet ASTM/ASME standards - but also on helping you match the appropriate grade, heat treatment state and size based on the actual operating temperature, pressure and expected lifespan.
Based on our experience, the long-term success of the P92 project depends on three key factors:
- For specific temperatures and media, select the appropriate creep design data;
- By using the traceable melting furnace number, ensure consistency in composition and performance among different batches.
- Provide a complete document chain covering the entire process - from the warranty certificate, heat treatment records to the final installation.
We work closely with designers, engineering companies and procurement teams to ensure that the materials you receive are not only compliant in writing, but also reliable and verified through practical use - whether in the long-term creep conditions of the 600°C main steam pipeline, or in the frequently subjected-to-thermal fatigue bypass systems of the peaking units.
Attention
The ASTM A335 P92 alloy pipe is not suitable for all high-temperature applications - however, in the ultra-supercritical thermal power generation sector where long-term resistance to creep and oxidation is required at temperatures ranging from 600 to 625°C, it offers a reliable and thoroughly validated solution.
If your project involves long-term high-temperature and high-pressure operation, requires a significant increase in creep life, or aims to further enhance the parameters of the unit based on P91, choosing the appropriate material from the very beginning can significantly improve the safety and economy of long-term operation. In these cases, ASTM A335 P92 alloy pipes are often a practical and reliable engineering option.
Do you need a quotation or technical data sheet? Please inform us of the required outer diameter, wall thickness, length, quantity, as well as the design temperature and pressure. Our engineering and export team will reply with the price, delivery date and certification documents within 24 hours.
