ASTM A335 P91 Pipe
Brief Overview
ASTM A335 P91 pipe is a seamless ferritic alloy‑steel pipe designed for extreme high‑temperature and high‑pressure service. As a premium 9Cr‑1Mo‑V‑Nb grade, it delivers outstanding creep strength, oxidation resistance, and structural stability, making it the top choice for power plants, petrochemical refineries, and boiler systems. At Jiangsu Cunrui Metal Products Co., Ltd., we supply fully compliant ASTM A335 P91 pipe with strict quality control and competitive factory pricing.
What Makes P91 Different
Superior high‑temperature creep strength (up to 625°C), resisting long‑term deformation under stress.
Optimized alloy design with V, Nb, and N for fine grain stabilization and enhanced toughness.
Excellent oxidation & corrosion resistance from 8.00–9.50% Cr, forming a protective Cr₂O₃ film.
Cost‑effective alternative to expensive austenitic stainless steels (e.g., 304/316).
Full compliance with ASTM A335/ASME SA335 standards, ensuring consistent performance.
High performance
Chemical Composition (ASTM A335 Standard, wt%)
Mechanical Properties (After Heat Treatment)
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Features & Advantages
Our capabilities
Seamless Alloy Construction
No welded seams, avoiding potential leakage risks and enhancing pressure-bearing capacity, specially designed for harsh high-temperature (up to 620℃) and high-pressure working environments.
High-Temperature Performance
Composed of chromium, molybdenum, vanadium and niobium, it forms a tempered martensite structure after heat treatment, with excellent creep resistance and oxidation resistance, far exceeding ordinary carbon steel pipes.
Excellent Mechanical Properties
High tensile and yield strength, good toughness and ductility, easy to weld and machine, adapting to various on-site installation needs without compromising performance.
Cost-Effective Solution
Direct factory supply with optimized production processes, enabling us to offer competitive prices while maintaining high quality, more cost-effective than imported ASTM A335 P91 pipes.
Long Service Life
Outstanding corrosion resistance (resisting high-temperature steam corrosion and sulfide erosion) and thermal stability, minimizing maintenance costs and extending the service life of your piping systems.
Customizable Specifications
Available in various outer diameters, wall thicknesses, and lengths, fully tailored to your project requirements, including special size customization for supercritical power units.
why choose us
About Jiangsu Cunrui Metal Products Co., Ltd.
Located in Wuxi, Jiangsu, Jiangsu Cunrui Metal Products Co., Ltd. is a professional manufacturer and exporter with over 19 years of steel industry experienceJiangsu Cunrui Metal Products Co., Ltd.. Our self‑owned factory covers 20,000+ m², equipped with advanced production lines for seamless pipe processing, heat treatment, and precision testingJiangsu Cunrui Metal Products Co., Ltd.
Certifications & Customer Trust
All our ASTM A335 P91 pipes come with:
- EN 10204 3.1 Mill Test Certificate
- ISO 9001:2015 certified factory
- PED 2014/68/EU (available for Europe)
- Third-party reports – SGS, TÜV, or BV upon request
- Heat treatment logs + hardness test reports
Result: Our clients trust our materials. They trust Jiangsu Cunrui Metal Products Co., Ltd. because we never compromise on documentation or traceability.
Client Trust
Long‑Term Partnerships
We prioritize win‑win cooperation. Most clients who purchase ASTM A335 P91 pipe from us for the first time become long‑term partners, attracted by our stable quality, competitive prices, and responsive after‑sales serviceJiangsu Cunrui Metal Products Co., Ltd.. We aim to be your reliable global steel supplier for years to come.
Our ASTM A335 P91 pipe holds complete international certifications and detailed test reports, covering chemical composition, mechanical properties, and heat treatment recordsJiangsu Cunrui Metal Products Co., Ltd.. These credentials reflect our commitment to quality and have earned us long‑term trust from clients across Europe, Southeast Asia, the Middle East, and North AmericaJiangsu Cunrui Metal Products Co., Ltd..
FAQ
Q: Can you provide custom sizes?
A: Yes. We offer OD 21–509 mm, WT 2.1–20 mm, and custom lengths up to 12 meters.
Q: What industries use ASTM A335 P91 pipe?
A: It is widely used in power plant main steam lines, hot reheat lines, boiler headers, petrochemical process piping, and heat exchangers.
Q: How do you help with tariff avoidance?
A: We can ship to a third-country warehouse (e.g., Malaysia or Thailand), then re-export to your final destination with a new set of commercial documents. This is legal and widely used for high-tariff markets like the EU, US, and India.
