ASME SA335 P91 alloy steel seamless pipe for high temperature service

Standard: ASME SA335

ASME SA335 P91 alloy steel seamless pipe has a high level of chromium and molybdenum content, and is also called as P91 chrome moly steel pipe. ASME SA335 P91 is equivalent to ASTM A335 P91, as well as ASME ASTM (S)A213 T91 steel. The chromium content increases the oxidation resistance and high-temperature strength of the P91 steel pipe. The molybdenum increases creep resistance of the P91 seamless pipe. Also, 91 alloy steel seamless pipe has smaller quantities of Manganese and Nickel, which increase its hardenability.

ASME SA335 P91 alloy steel seamless pipe chemical composition:

ASME SA335

P91

0.08-0.12

0.30-0.60

≤0.020

≤0.010

0.20-0.50

8.0-9.5

0.85-1.05

0.18-0.25

≤0.40

0.06-0.10

0.030-0.070

≤0.02

≤0.01

ASME SA335 P91 alloy steel seamless pipe mechanical property:

ASME SA335	Tensile Strength, MPa	Yield Strength, MPa
P91	585 min	415 min

Heat treatment requirements of ASME SA335 P91 alloy steel seamless pipe:

ASME SA335	Heat treatment type	Normalizing temperature Range oF[oC]	Subcritical annealing or tempering temperature Range oF[oC]
P91	Normalize and temper	1900-1975 [1040-1080]	1350-1470 [730-800]
P91	Quench and temper	1900-1975 [1040-1080]	1350-1470 [730-800]

ASME SA335 P91 alloy steel seamless pipe has been widely used in different industries for high temperature and pressure services. The temperature environments can be 540–750 oC. P91 steel pipe is one of the most consumption alloy steel pipes in boiler industry, heat exchanger, power station, high and super high pressure vessels.

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