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Maximum Allowable Stress of Hastelloy C-276 at Elevated Temperatures

Hastelloy C-276 fittings manufactured to ASTM B366 Gr. N10276 can be furnished in either seamless or weld types. Its nominal composition is 54Ni-16Mo-15Cr and the fittings shall be solution annealed. The fittings can be used for a plurality of applications based on ASME Boiler and Pressure Vessel Codes. Generally, these applications can be classified into two conditions: Condition A & Condition B. Condition A refers to Hastelloy C-276 fittings used for ASME BPVC Section I, Section VIII Division 1, and Section XII. Condition B refers to Hastelloy C-276 seamless or welded  fittings used for ASME BPVC Section VIII Division 2 respectively. The maximum allowable stress of ASTM B366 Gr. N10276 at elevated temperatures are listed in below 3 tables.

ASTM B366 Gr. N10276 elbows

ASTM B366 Gr. N10276 elbows, 2“ L/R BW SCH40 90°

1. Maximum Allowable Stress of Hastelloy C-276 Fittings in Condition A

*Temp.-20~100200300400500600650700750800
*MAS27.327.327.327.326.925.224.624.023.523.1
*Temp.850900950100010501100115012001250-
*MAS22.822.622.422.318.515.012.29.87.8-
*Temp.: metal temperature, °F, not exceeding; *MAS: maximum allowable stress, ksi. For both seamless & welded fittings.
*The maximum applicable temperatures of Hastelloy C-276 fittings for Section I, Section VIII-1, and Section IX shall be 1000°F, 1250°F, and 650°F, respectively.

2. Maximum Allowable Stress of Hastelloy C-276 Fittings in Condition B

*Temp.-20~100150200250300350400450
*MAS-127.327.327.327.327.327.327.327.3
*MAS-223.223.223.223.223.223.223.223.2
*Temp.500550600650700750800-
*MAS-126.926.025.224.624.023.523.1-
*MAS-222.822.121.520.920.420.019.6-
*Temp.: metal temperature, °F, not exceeding; The maximum applicable temperature for Section VIII-2 is 800°F.
*MAS-1: The maximum allowable stress of Hastelloy C-276 welded fittings at elevated temperatures.
*MAS-2: The maximum allowable stress of Hastelloy C-276 seamless fittings at elevated temperatures.

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