Highly ductile chromium alloy containing silver

Abstract

A chromium alloy, characterized in that it has a composition which has silver in a content of 0.002 to 5 atomic % and the balance of chromium and inevitable impurities is proposed. The chromium alloy is novel, and retains high melting point, excellent resistance to corrosion and oxidation, excellent thermal conductivity and the like, which are inherent in a chromium base alloy, and also exhibits good ductility at room temperature, and thus can be practically used as an alternative for a Ni base alloy.

1 - 7 . (canceled)  
   
   
       8 . A structural heat-resistant chromium alloy with a durable temperature of 800° C. or more comprising, as a chemical composition thereof, 0.002 to 5 atomic % of silver, 0.05 to 6.0 atomic % of silicon, 0.05 to 10 atomic % of aluminum or 0.05 to 10 atomic % of a combined amount of silicon and aluminum and the balance of chromium and inevitable impurities.  
   
   
       9 . The structural heat-resistant chromium alloy according to  claim 8  containing 0.1 to 5 atomic % of silver.  
   
   
       10 . The structural heat-resistant chromium alloy according to  claim 8  containing 0.5 to 3.5 atomic % of silver.  
   
   
       11 . (canceled)  
   
   
       12 . The structural heat-resistant chromium alloy according to  claim 8 , containing 10 atomic % or less of at least one of Mo, W, Re, Fe, Ru, Co, Rh, Ni, Pt and Ir as a combined amount thereof.  
   
   
       13 . The structural heat-resistant chromium alloy according to  claim 8  produced by casting.  
   
   
       14 . A structural heat-resistant product configured mainly with the chromium alloys according to  claim 8 .  
   
   
       15 . A structural heat-resistant chromium alloy with a durable temperature of 800° C. or more for use for article selected from the group consisting of rotor and stator blades, heat-resistant wheels, rocker arms, suction and exhaust valves, coupling rods, turbine shrouds and heat-treating furnace walls, 
 comprising, as a chemical composition thereof, 0.002 to 5 atomic % of silver, and the balance of chromium and inevitable impurities.