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    Process for the production of high apparent density water atomized steel powders
    2.
    发明授权
    Process for the production of high apparent density water atomized steel powders 失效
    生产高密度水性原子级粉末的方法

    公开(公告)号：US3900309A

    公开(公告)日：1975-08-19

    申请号：US38960373

    申请日：1973-08-16

    申请人： UNITED STATES STEEL CORP

    发明人： CHAO HUNG-CHI ,  GROSS JOHN H ,  JUDD ROBERT R ,  RUECKL ROGER L

    IPC分类号： B22F1/00 ,  B22F9/04 ,  B22F9/08 ,  B22F1/04

    CPC分类号： B22F9/04

    摘要： The apparent density of molding-grade, water atomized steel powder can be significantly increased by employing the following prescribed treatment. Coarse particles are removed in order that at least 80% of the initial powders are finer than 80 mesh. The size distribution of the powders is then determined. The powders are then annealed to both reduce the carbon and oxygen contents and soften the particles. The annealed and agglomerated particles are then ground in a disk mill at specified speeds and gap spacings, depending on the size distribution of the initial powders. Apparent densities in excess of 3.2 may be achieved by (a) employing powders with a coarser particle size distribution, (b) increasing the rotational speed of the disks and (c) decreasing the mill gap.