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Introduction to ASTM A335 P91 pipe

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astm a335 p91 pipe,a335 p91 seamless alloy steel pipe

Introduction to ASTM A335 P91 pipe

Date:2025-04-29

The ASTM A335 P91 pipe is a seamless ferritic alloy steel pipe designed specifically for high-temperature applications.

Its chemical composition includes key elements such as molybdenum (Mo) and chromium (Cr), which significantly enhance the pipe’s mechanical properties. The addition of these elements improves the tensile strength and overall durability of the SA335 Grade P91 pipe.

The mechanical properties are as follows:

Tensile strength: approximately 415 MPa

Yield strength: around 205 MPa

Elongation: typically ranges between 20% and 30%

Known for its outstanding performance, the Alloy Steel P91 seamless pipe is often praised for its excellent resistance to chloride-induced corrosion, making it an ideal choice for use in saltwater environments and other corrosive conditions.

Super Steel Manufacturing Co.,Ltd is professional ASTM A335 P91 pipe manufacturer, for more details, please contact:sales@super-steels.com

ASTM A335 P91 Chemical Composition

C, %	Mn, %	P, %	S, %	Si, %	Cr, %	Mo, %	V, %	N, %	Ni, %	Al, %	Nb, %
0.08-0.12	0.3-0.6	0.02 max	0.01 max	0.2-0.5	8.0-9.5	0.85-1.05	0.18-0.25	0.03-0.07	0.4 max	0.04 max	0.06-0.10

ASTM A335 P91 Properties

Tensile Strength , MPa	Yield Strength, MPa	Elongation, %	Hardness, HB
585 min	415 min	20 min	250 max

Physical Properties of P91 Pipe

Temperature T ° C / ° F (° C / F)	Specific heat J / kgK (Btu / lb ° F)	Thermal conductivity W / mK (Btu · in / ft 2 · h · ° F)	Electrical resistance μΩ · cm (Ω circ / ft)	Young's modulus kN / mm 2 (10 3 ksi)	Expansion coefficient from 20 ° C to T 10 -6 / K (10 -6 / ° F)
20/68	460 (-)	26 (-)		218 (-)
200/392				207 (-)	11.3 (-)
400/752				190 (-)	12.0 (-)
500/932		30 (-)			12.3 (-)
600/1112					12.6 (-)
650/1202				162 (-)	12.7 (-)

temperature	0.2% proof stress at higher temperatures
° C / ° F	Rp 0.2
	Mpa / ksi
100/212	410 / 59.4
200/392	380 / 55,1
300/572	360 / 52,2
400/752	340 / 49,3
500/932	300 / 43.5
600/1112	215 / 31,1