DEVELOPMENT OF HIGH INTEGRITY CLOSE TOLERANCE HIGH STRENGTH AIRCRAFT QUALITY STEEL CASTINGS.
Rept. for May 61 - May 63.
AMERICAN BRAKE SHOE CO MAHWAH N J
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A program to improve the mechanical properties of cast 5 chromium steel was carried out. vacuum degassing of air melted material of a composition based on that of wrought H-11 hot work die steel did not exhibit any significant benefits. A modified 5 chromium steel containing no vanadium and 2.4 molydbenum had good tensile properties and excellent toughness in cast one-inch sections. Investigation of the properties of cast 18 percent nickel maraging steel revealed that this material has high toughness and ductility in cast one-inch sections. Cast sections of maraging steel of two inches and greater exhibited a defect which seriously impaired tensile properties. Experiments to identify or eliminate the defect were unsuccessful. Author