STEEL FOR MACHINE STRUCTURAL USE HAVING GOOD CHIP DISPOSABILITY AND CUTTING TOOL LIFE AND LOWER ANISOTROPY OF MECHANICAL PROPERTIES

摘要

PURPOSE: To improve chip disposability and cutting tool life and to lower the anisotropy of mechanical properties by specifying C, Si, Mn, P, S, and Al, simultaneously adding In and Te to the steel and adjusting the ratios thereof. ;CONSTITUTION: This steel for machine structural use is constituted by incorporating 0.001 to 0.05% In and 0.004 to 0.2% Te into a steel for structural purposes and satisfying the conditions of [Te]/[In]; 4 and ([Te]-0.9[In])/[S];≥0.14 (where []denote weight % of the respective elements). The In in the steel is made to exist in the form of the metal phase of the In alone and the intermetallic compd. of the In and Te. The above-mentioned steel for structural purposes contains 0.03 to 0.6% C, ≤0.5% Si, 0.3 to 2% Mn, ≤0.12%P,0.2% Si, and 0.01 to 0.1% Al. The above-mentioned steel has the good chip disposability and cutting tool life, the improved ductility and toughness in a transverse direction and the smaller anisotropy of the mechanical properties.;COPYRIGHT: (C)1993,JPO&Japio