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Thermal Expansion Coefficients for ASTM A420 WPL6

ASME Boiler and Pressure Vessel Code(BPVC) Section II Part D has listed the thermal expansion coefficients at elevated temperatures for ASTM A420 WPL6 material which pertains to Group 1. These coefficients include the instantaneous coefficient of thermal expansion, the mean coefficient of thermal expansion, and the linear thermal expansion coefficient. ASTM A420 Gr. WPL6 is a typical carbon steel used for low-temperature service.

1. Instantaneous Coefficient of Thermal Expansion for ASTM A420 WPL6

Temp. °F70100150200250300350400450
Coefficient A6.46.66.87.07.27.37.57.77.8
Temp. °F500550600650700750800850900
Coefficient A8.08.28.38.58.78.89.09.19.2
Temp. °F9501000105011001150120012501300-
Coefficient A9.39.49.49.59.59.59.59.5-
*Coefficient A: the instantaneous coefficient of thermal expansion, Unit: ×10−6(inch/in./°F).

2. Mean Coefficient of Thermal Expansion for ASTM A420 WPL6

Temp. °F70100150200250300350400450
Coefficient B6.46.56.66.76.86.97.07.17.2
Temp. °F500550600650700750800850900
Coefficient B7.37.37.47.57.67.77.87.97.9
Temp. °F9501000105011001150120012501300-
Coefficient B8.08.18.18.28.38.38.48.4-
*Coefficient B: the mean coefficient of thermal expansion in going from 70°F to indicated temperature. Unit: ×10−6(inch/inch/°F).

3. Linear Thermal Expansion Coefficient for ASTM A420 WPL6

Temp. °F70100150200250300350400450
Coefficient C
Temp. °F500550600650700750800850900
Coefficient C
Temp. °F9501000105011001150120012501300-
Coefficient C-
*Coefficient C: the linear thermal expansion in going from 70°F to indicated temperature. Unit: inch/100 ft.

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