Properties of a High-Purity Fe–mass% Cr Alloy

Abstract

Since Fe–Cr alloys containing more than 30 mass% chromium are potentially useful for many industrial applications, the properties of a high‐purity Fe–50 mass% Cr alloy were investigated to see whether the purification improves properties. Both mechanical and physical properties were investigated: mechanical properties such as tensile properties and deformability, and physical properties such as density, Young's modulus, thermal expansion rate, specific heat, thermal conductivity, heat transfer rate, specific electrical resistivity, and magnetic properties. It is concluded that a high‐purity Fe–50 mass% alloy is deformable, while maintaining high strength, at temperatures between 293 and 1523 K. Also, it possesses several desiable physical properties for high‐temperature services such as low thermal expansion coefficient and high thermal conductivity, compared to type 304 stainless steel.

Effect of Tungsten on Mechanical Properties of High-Purity 60 mass%Cr-Fe Alloys

“…Figure 1 shows the tensile strength and the reduction in area of 60Cr-Fe-4W (I) after Gleeble testing at temperatures between 1273 K and 1573 K, together with the data of 50Cr-Fe and 60Cr-Fe. 3,4) The data of 50Cr-Fe-5W and 50Cr-Fe-8W alloys 5) were also shown in the same Figure. It was found from the present investigation that the tensile strength of 60Cr-Fe increases by the addition of tungsten at temperatures between 1273 K and 1573 K. The reduction in area of 50Cr-Fe increases by the addition of tungsten; however, the Effect of Tungsten on Mechanical Properties of High-Purity 60 mass%Cr-Fe Alloys 143 and Fig. 4(b).…”

Purification of Cobalt, Nickel, and Titanium by Cold-Crucible Induction Melting in Ultrahigh Vacuum

“…Since then we have published many papers [14][15][16] on preparation, trace analysis, and characteristic properties of ultrahigh-purity metals and alloys. We prepared, for example, ultrahighpurity iron ingot 10 kg in weight of higher than 99.9988% purity after the analysis of 33 elements and containing the concentration of C þ N þ O þ S of less than 3.4 mass ppm using the CCIM furnace, 17) high-purity Fe-Cr system alloys, 18,19) high-purity Ti-Al alloys, 20) and so on. The purpose of the present paper is to investigate the effect of CCIM under ultrahigh vacuum of 10 À7 Pa on the purification of high-purity nickel, cobalt and titanium due to the removal of gaseous impurities and thus to establish a new purification procedure to obtain high-purity these metals even on the scale of one to ten kg in weight.…”