Thermophysical measurements on low carbon 304 stainless steel above 1400 K by a transient (subsecond) technique

Abstract

Simultaneous measurements, by a subsecond duration transient technique, to determine the specific heat capacity, c _p , the electrical resistivity, ρ, and the hemispherical total emittance in the temperature range 1400–1700 K, and the melting point and the radiance temperature at the melting point, of AISI type 304L stainless steel are described. The results are expressed by the relations:

$$c_p = 1127{\text{ }} - {\text{ }}7.265{\text{ }} \times {\text{ }}10^{ - 1} {\text{ }}T{\text{ }} + {\text{ }}2.884{\text{ }} \times {\text{ }}10^{ - 4} {\text{ }}T^2$$

$$\rho = 75.59{\text{ }} + {\text{ }}4.695{\text{ }} \times {\text{ }}10^{ - 2} {\text{ }}T{\text{ }} - {\text{ }}9.592{\text{ }} \times {\text{ }}10^{ - 6} {\text{ }}T^2$$

where c _p is in J · kg⁻¹ · K⁻¹, ρ is in ΜΩ · cm, and T is in K. The value of the hemispherical total emittance is 0.37 in the range 1700–1900 K. The melting point and the radiance temperature (at 653 nm) at the melting point are 1707 and 1590 K, respectively, yielding a value of 0.385 for the normal spectral emittance at the melting point. Estimated inaccuracies of the measured properties are: 3% for the specific heat capacity, 2% for electrical resistivity, 5% for hemispherical total emittance, and 8 K for melting point and radiance temperature at the melting point.