EXPLORATORY STUDIES OF 180/210 KSI YIELD STRENGTH MARAGING STEELS.
UNITED STATES STEEL CORP MONROEVILLE PA
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To investigate the feasibility of using maraging steels for 180 to 210-ksi yield strength submarine-hull applications, an extensive investigation was made of the effect of variations in composition and in processing procedures on the mechanical properties and microstructure of 12to 4-in.-thick maraging-steel plates. With the exception of a 12-in.-thick plate from a production heat of 12Ni-5Cr-3Mo steel and a plate from a small vacuum-consumable-electrode remelted heat of 18Ni-8Co-2Mo steel, the 16 laboratory heats, 2 production heats, and 1 INCO heat of maraging steel studied had a disappointingly low level of notch toughness, even though rather wide variations in chemical composition and processing procedure were investigated. Metallographic studies indicated that the poor toughness is probably due to titanium and zirconium carbide andor nitride and sulfide particles precipitated during solidification of the ingot. Author