STUDIES ON MECHANICAL AND WEAR-RESISTING PROPERTIES OF LOW Mn-Mo STEEL CASTINGS

Abstract

Mechanical and abrasion-resisting properties of low Mn-Mo steel that castings contained 1.1-1.7% Mn and 0.2-0.4% Mo were investigated.
Heat treatments used were homogenizing and normalizing or double normalizing. Tempering were carried on by furnace cooling from 650-550°C.
The results obtained were as follows:
0.36% C, 1.63% Mn and 0.32% Mo steel castings had better mechanical properties than 0.41% C, 1.20% Mn and 0.22% Mo steel castings. Homogenizing and double normalizing treatment were found effective for toughening, but 1.63% Mn steel castings had higher hardness as annealed, therefore their machining were rather difficult.
Wear-resistance of 1.20% Mn steel castings was relatively better than 1.63% Mn or 0.52% C and 1.39% Mn steel castings.