Instantaneous Coefficient of Thermal Expansion

Temp. °C	20	50	75	100	125	150	175
*Coefficient A	9.9	10.5	11.1	11.5	11.9	12.2	12.4
Temp. °C	200	225	250	275	300	325	350
*Coefficient A	12.6	12.7	12.8	12.9	12.9	13.1	13.2
Temp. °C	375	400	425	450	475	500	525
*Coefficient A	13.4	13.6	13.7	13.8	13.7	13.4	12.7

*Coefficient A: the instantaneous coefficient of thermal expansion for 9% nickel steel at elevated temperatures, 10^-6 mm/mm/°C.

Mean Coefficient of Thermal Expansion

Temp. °C	20	50	75	100	125	150	175
*Coefficient B	9.9	10.2	10.5	10.7	11.0	11.2	11.4
Temp. °C	200	225	250	275	300	325	350
*Coefficient B	11.5	11.7	11.8	11.9	12.0	12.0	12.1
Temp. °C	375	400	425	450	475	500	525
*Coefficient B	12.2	12.3	12.4	12.5	12.5	12.6	12.6

*Coefficient B: the mean coefficient of thermal expansion for 9% nickel steel in going from 20°C to indicated temperature, 10^-6 mm/mm/°C.

Linear Thermal Expansion

Temp. °C	20	50	75	100	125	150	175
*Coefficient C	0	0.3	0.6	0.9	1.2	1.5	1.8
Temp. °C	200	225	250	275	300	325	350
*Coefficient C	2.1	2.4	2.7	3.0	3.4	3.7	4.0
Temp. °C	375	400	425	450	475	500	525
*Coefficient C	4.3	4.7	5.0	5.4	5.7	6.0	6.4

*Coefficient C: the linear thermal expansion for 9% nickel steel in going from 20°C to indicated temperature, mm/m.

For low temperature data on thermal expansion of 9%-Ni alloy steel, please contact our technical department at piping@metalspiping.com.