METHOD FOR THE POWDER METALLURGICAL PRODUCTION OF HIGH-STRENGTH MOLDED PARTS AND HARDNESS OF SI-MN OR SI-MN-C ALLOY STEELS

摘要

1. Process for the powder metallurgical production of true to size structural parts of high strength and hardness made of silicon manganese or silicon manganese carbon alloyed steels, comprising mixing, in powdered form, the alloying elements silicon and manganese or silicon, manganese and carbon by way of the alloy carriers ferrosilicon, ferromanganese or a silicon-manganese-iron master alloy having silicon and manganese contents in the ranges from 10 to 30 wt.% Si, 20 to 70 wt.% Mn, remainder Fe and graphite, with an iron powder in such quantities that they correspond to the weight proportions in the powder mixture of 0.3 to 3 wt.% Si, of 0.3 to 4 wt.% Mn, of 0 to 0.5 wt.% C and a mass proportion of manganese to silicon between 1.5 and 3, and compressing the powder mixture in the familiar way and sintering it in a protective gas atmosphere in a temperature range from 1150 degrees C to 1250 degrees C, and then cooling it.