SA335 P91 Superalloy Tube Heat Treatment Requirements

 P91 is a grade that conforms to the ferritic alloy ASME SA335 standard for high temperature seamless pipes, and it is also a grade that we sell well.

CHEMICAL COMPOSITION OF ALLOY STEEL P91 PIPES

Grade P91
C, %
Mn, %
P, %
S, %
Si, %
Cr, %
Mo, %
UNS K91560
0.12 max
0.30-0.60
0.02
0.01
0.5 max
8.0-9.5
0.85-1.05
 

MECHANICAL PROPERTIES OF ALLOY STEEL P91 PIPES

Tensile Strength, MPa
Yield Strength, MPa
Elongation, %
585 min
415 min
20 min

One difference between P91 and other grades is the difference in heat treatment temperature:
Except when the buyer specifies Supplementary Requirement S7, grade P91 steel pipe is normalized at a minimum temperature of 1040°C and tempered at a minimum temperature of 730°C as the final heat treatment. For thicknesses above 3 in., when mutually agreed by the steel mill and the buyer, the following conditions are permitted. Liquid quenching plus tempering instead; in this case the final heat treatment of the steel pipe shall be quenched at a minimum of 1040°C and tempered at a minimum of 730°C.

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From:http://boilersteelpipe.com/pro/smls/sa335-p91-superalloy-tube-heat-treatment-requirements.html

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