Abstract: A low alloy
ultra-high-strength steel was designed by using the valence
electron structures, the kinetures, the kinetics of phase
transformation and the morphology as well as the relation
between strength and toughness of 30CrMnSiNi2A and Gc-4 steels.
The new steel is 40CrMnSi2Ni2MoVCuA, which has both the high
toughness of 30CrMnSiNi2A and the ultra-high-strength of Gc-4,
and its composition is similar to that of 300M alloy.
Consequently, the nature of this work is to establish the
valence electron structure and microscopically to design the
composition of the American alloy 300M, which is a best low
alloy ultra-high-strength steel.
Key words:
Ultra-high-strength steel Valence
electron structure Composition design
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