Compared with metallic nickel, metallic chromium has high melting point (1860℃), high specific strength (ratio of strength to density), good oxidation resistance and corrosion resistance to high sulfur, diesel oil and seawater. In the mid-1950s, research on chromium alloy high temperature materials began. Because the plastic-ductile-brittle transition temperature of chromium alloy is higher than room temperature, especially when exposed to air at high temperature, the plasticity of the alloy becomes worse due to the infiltration of nitrogen, and the impact toughness can not meet the requirements, so above the service temperature of nickel-based superalloy, chromium alloy has not been developed and applied as turbine blades and guide blades of jet engines. In the early 1960s, the dispersion strengthened Cr-MgO alloy (Chrome-30) developed by D.V.Scruggs Company of the United States had good room temperature plasticity. In the temperature range of 1000 ~ 1200℃, MgO Cr2O3 spinel structure is formed on the surface of the material, so the alloy has high temperature oxidation resistance and erosion resistance. This alloy has been used to manufacture flame stabilizers for gas turbines, thermowells and other components in ethylene fractionating furnaces. Improving room temperature plasticity and reducing plastic-ductile-brittle transition temperature are the keys to develop chromium alloys. The interstitial elements nitrogen, oxygen and carbon have obvious effects on the room temperature plasticity of chromium. Their limited contents are 20, 200 and 200ppm respectively. The room temperature plasticity of chromium alloy can be improved by using raw materials with low gap elements and adding alloying elements (such as yttrium and lanthanum) that can purify impurities. Powder metallurgy is another method to improve room temperature plasticity.