After reduction annealing for about 70 minutes at approximately 900° C., the powder, having a residual oxygen content of less than 0.15 percent by weight and a particle size after {HEAD ~ sieving} of {TAIL ~ less than 0.2 mm}, was mixed with microwax as a lubricant 
After reduction annealing for about 70 minutes at approximately 900 ° C. , the powder , having a residual oxygen content of less than 0.15 percent by weight and a particle size after { HEAD ~ sieving } of { TAIL ~ less than 0.2 mm } , was mixed with microwax as a lubricant
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