Studded Tubes Finned Tubes Alloy Steel ASTM A335 P9 For 500℃ Working Temperature

ASTM A335 / ASME SA335 P9 is a seamless ferritic alloy steel pipe, grade UNS K90941, composed of a 9Cr-1Mo alloy. P9 material exhibits excellent high-temperature creep strength and superior resistance to oxidation and sulfide corrosion. It can operate at temperatures up to 550–600°C and is suitable for high-pressure, high-temperature thermal equipment. P9 is specifically designed for high frequency welded finned tubes,serrated finned tubes and studded finned tubes and can be used in heat exchanger tube production.

This type of finned tube - studded finned tube has high heat exchange efficiency, large stud spacing, is dirt-resistant and easy to clean; it has high mechanical rigidity and is resistant to flue gas erosion and thermal cycle fatigue; it is perfectly suited for environments with heavy dust and high sulfur flue gas.

Chemical Composition (%)

Mechanical Properties

Inspection Tests & Inspection Standards

Base tube/pipe inspection: ultrasonic testing (UT), hydrostatic testing, normalizing and tempering heat treatment, chemical composition/mechanical property testing, PMI test,etc.;

Post-weld inspection: Weld integrity penetrant testing (PT), stud pull-out strength testing;

Compliance with standards: ASME Section 1, ASME Section 8, API 661, PED Pressure Equipment Directive;

Provide a complete set of factory documentation: Material Testing Certificate (MTC), heat treatment report, non-destructive testing report, dimensional inspection records, PMI report, etc.

All YUHONG products undergo comprehensive ultrasonic testing, hydrostatic testing, and penetrant weld inspection, and fully comply with ASME and API standards.

Application

Convection and radiation sections of refinery heating furnaces (crude oil, vacuum distillation, hydrocracking furnaces)

Submerged heat exchange tubes in circulating fluidized bed (CFBC) boilers

Waste heat recovery furnaces for processing heavy fuel oil and coal-fired flue gas

Waste heat exchangers for high-sulfur process gas reformers

High-HRSG (High-Temperature Heat Recovery Steam Generator) for gas turbines

High-temperature superheaters and reheaters in industrial waste heat boilers

Process air coolers and high-temperature shell-and-tube heat exchangers

Flue gas waste heat recovery systems for natural gas combustion units

Available Sepecification Max Operating Temperature 500℃