| 摘要 |
A steel composition and method of processing have been developed that provide good grain coarsening resistance and optimum toughness after austenitizing at high temperatures for extended periods of time. The composition comprises, in % by weight, about: 0.10-0.40% C, 0.018-0.064% Nb, 0.024-0.066% Al, and 80-220 ppm N, the balance being Fe and other alloying elements found in common carburizing grades of steel. The steel is particularly suited to improving the core toughness of case-carburized components that require through-section toughness and fatigue resistance.
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