ASTM A335 Grade P11 High-Temperature Alloy Pipes
1.25% Chromium and 0.5% Molybdenum seamless ferritic alloy pipes engineered for steam superheaters, headers, and refinery lines.
ASTM A335 P11 / ASME SA335 P11 High-Pressure Steam Pipe
Starlight Tubes is a specialized manufacturer and global supplier of ASTM A335 Grade P11 seamless ferritic alloy steel pipes. Grade P11 (1.25Cr-0.5Mo) is specifically designed for high-temperature service in thermal power generation boilers, heat recovery steam generators (HRSG), and petroleum refineries.
Every A335 P11 pipe is produced from vacuum degassed steel billets and subjected to strict normalization and tempering. We perform 100% ultrasonic examination, hydrostatic pressure testing, hardness testing, and complete chemical PMI verification to guarantee safety under high steam pressures.
Technical Specifications
ASTM / ASME CompliantTechnical Specifications — ASTM A335 Grade P11
Certified chemical limits and mechanical tensile properties for ASTM A335 P11
| Grade | C | Mn | P (max) | S (max) | Si | Cr | Mo |
|---|---|---|---|---|---|---|---|
| P11 | 0.05-0.15 | 0.30-0.60 | 0.025 | 0.025 | 0.50-1.00 | 1.00-1.50 | 0.44-0.65 |
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Source Certified ASTM A335 P11 Alloy Pipes
Starlight Tubes provides mill-certified ASTM A335 P11 seamless pipes with full heat treatment charts, 100% NDT inspection, and export delivery.
Frequently Asked Questions on ASTM A335 Grade P11 Chrome-Moly Pipes
Key engineering, tolerance, and international compliance answers from our metallurgical quality desk.
Grade P11 contains 1.00-1.50% Chromium and 0.44-0.65% Molybdenum, providing significant creep strength and resistance to graphitization at high operating temperatures.
Request Project Quotation for ASTM A335 Grade P11 Chrome-Moly Pipes
Submit your required sizes, wall thicknesses, material grades, and total tonnage. Our technical sales engineers respond with complete mill pricing and lead times within 24 hours.