THE PRODUCTION AND PROPERTIES OF 180 KSI MINIMUM-YIELD-STRENGTH MARAGING STEELS.
UNITED STATES STEEL CORP MONROEVILLE PA
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This report describeds the production and properties of hemispheres produced from 58-inch-thick plate, of 14-, 12-, 1-14-, 1-12-, 1-34-, 2-, 3-, and 4-12-inch-thick plates, and of 116-inch-diameter welding electrodes pro duced under this contract. Plates for 58-inch-thick hemispheres were from a part of an 80-ton electricfurnace heat of 18Ni-8Co-2.6Mo steel. Because plates 1 inch thick and over from this heat did not meet the Charpy impact-test specifications, all plates other than the 58inch-thick plate were produced from 20-ton electricfurnace heats of 12Ni-5Cr-3Mo steel. Welding electrodes of both the 18Ni-8Co-2.6Mo and 12Ni-5Cr-3Mo steel compositions were produced from 300-pound vacuuminduction furnace heats. The results of tension and impact tests showed that all materials met the mechanical-property specifications. In addition, the results of supplementary studies on aging response, stress-strain characteristics in tension and compression, moduli of elasticity, coefficients of thermal expansion, transformation temperatures, and grain size and microstructure of the two steels are reported. Author