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The Allowable Stress – Temperature Chart for ASTM A335 P91

P91 is one of the steel grades specified by ASTM A335, the standard specification for seamless ferritic alloy steel pipe for high-temperature service. The maximum allowable stress in different temperature ranges shall be determined by ASME B31.1 and ASME B31.3 respectively.

a combined-cycle power plant with P91 smls pipes introduced

A 660MW combined-cycle power plant in which the A335 P91 seamless pipes were introduced by Metals-Piping.

1. ASME B31.1: Allowable Stress – Temperature of ASTM A335 P91

*Temp. °F-20-100200300400500600650700750
*AS-I, ksi24.324.324.324.224.123.723.422.922.2
*AS-II, ksi24.324.324.324.224.123.723.422.922.2
*Temp. °F80085090095010001050110011501200
*AS-I, ksi21.320.319.117.816.314.010.37.04.3
*AS-II, ksi21.320.319.117.816.312.99.67.04.3
*Temp.: the metal temperature shall be interpreted as “not exceeding”.
*AS-I: the maximum allowable stress for thickness less than 3 inches.
*AS-II: the maximum allowable stress for thickness 3 inches or greater.
*The tabulated values are applicable to ASTM A335 P91 pipes used for power piping construction as per ASME B31.1.

2. ASME B31.3: Allowable Stress – Temperature of ASTM A335 P91

*Temp. °F-20~100200300400500600650700750
*BS, ksi28.328.328.328.228.127.727.326.725.9
*Temp. °F80085090095010001050110011501200
*BS, ksi24.923.722.320.718.014.010.37.04.3
*Temp.: the metal temperature shall be interpreted as “at the temperature and not exceeding”.
*BS: the basic allowable stress for thickness no greater than 3 inches.
*The tabulated values are applicable to both A335 P91 & A691 P91 pipes used for process piping construction as per ASME B31.3.

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