发明名称 |
SINTERED ALLOY STEEL WITH EXCELLENT CORROSION RESISTANCE AND PROCESS FOR ITS PRODUCTION. |
摘要 |
<p>Improved sintered alloy steel is produced by (1) mixing powdery stainless steel with a binder, moulding it and removing the binder by heating, (2) sintering the moulding under a reduced pressure of 30 Torr or less at 1000-1350 deg.C, and (3) resintering it in a non-oxidative atmos. eg. mixt. of inert gases contg. nitrogen, under normal pressure at a temp. higher than those of (1) and (2), 1250-1400 deg.C. The mean particulate size of the powdery stainless steel is 15 micro of less. When the binder is removed from the moulding by heating at (1), the C/O mole ratio of the moulding is adjusted to be 0.3-3.0. At (2) the C/O mole ratio is adjusted to 0.3-3.0. Pref. powdery stainless steel contains Cr (16-25 wt.%) and Ni (8-24 wt.%). Obtd. stainless alloy steel has the following properties: a stainless steel compsn., a density ratio of 92% or higher, max. radius of the pores in the organisation of 20 micro or less. The amt. of Cr in the surface of the sintered alloy steel is 80% or more of the amt. of Cr in the interior.</p> |
申请公布号 |
EP0378702(A1) |
申请公布日期 |
1990.07.25 |
申请号 |
EP19890907304 |
申请日期 |
1989.06.27 |
申请人 |
KAWASAKI STEEL CORPORATION |
发明人 |
KIYOTA, Y. C/O KAWASAKI STEEL CORP. TECH. RES. DIV;OHTSUBO, H. C/O KAWASAKI STEEL CORP. TECH. RE. DIV;OHTA, J. C/O KAWASAKI STEEL CORP. TECH. RES. DIV.;MATSUSHITA M. C/O KAWASAKI STEEL CORP. TECH. R. D.;SAKURADA I. C/O KAWASAKI STEEL CORP. TECH. R. DIV. |
分类号 |
B22F3/10;C22C33/02;C22C38/00;C22C38/40 |
主分类号 |
B22F3/10 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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