JP2005120458A5

JP2005120458A5 -

Info

Publication number: JP2005120458A5
Application number: JP2003359741A
Authority: JP
Filing date: 2003-10-20
Publication date: 2007-11-22
Anticipated expiration: 2023-10-20

Description

(b)Mo
Mo成分は、海水中における隙間腐食の防止に極めて有効に作用するものである。また、前記のCr成分と同様に、Mo成分は炭化物形成元素であり、炭化物析出による被覆層の硬化が図られる。したがって、このMo成分の場合も炭化物析出による硬さ向上の効果は二次的なものとし、隙間腐食防止の効果から検討した結果、Mo成分の含有量の下限はCr成分の含有量との関係によって決まり、その値が（11−0.1×Cr％）％未満、および（125−4×Cr％）％未満では所望の隙間腐食防止効果が得られなかった。一方、40％を越えて含有させても隙間腐食改善に著しい向上が見られないことから、その含有量を（11−0.1×Cr％）％以上、かつ（125−4×Cr％）％以上、40％以下と限定した。 (b) Mo
The Mo component works extremely effectively to prevent crevice corrosion in seawater. Similarly to the Cr component, the Mo component is a carbide-forming element, and the coating layer is hardened by carbide precipitation. Therefore, in the case of this Mo component as well, the effect of improving the hardness due to carbide precipitation is secondary, and as a result of examining the effect of preventing crevice corrosion, the lower limit of the Mo component content is related to the Cr component content. When the value is less than ( 11−0.1 × Cr% )% and less than ( 125−4 × Cr% )% , the desired crevice corrosion preventing effect cannot be obtained. On the other hand, there is no significant improvement in crevice corrosion improvement even if contained over 40%, so the content is ( 11-0.1 × Cr% )% or more and ( 125-4 × Cr% )% or more Limited to 40% or less.

(d)C
C成分はV成分、Cr成分、Mo成分と結合し、炭化物を析出して被覆層の硬化に作用するものであり、主にバナジウム炭化物の析出に消費される。しかし、1.6％以下では前記の被
覆層硬化作用に所望の効果が得られない。一方、全てのVが炭化物を生成するために必要
なC含有量はV％×12.011（炭素の原子量）/50.942（バナジウムの原子量）=（0.236×V％）％である。しかし、CはV以外にもCr及びMoと炭化物を生成するため、全てのVが炭化物を生成
するためにはCの含有量が0.236ＸV％では不十分である。従って、Cの含有量を1.6%以上、（0.236×V％＋2）％以下に限定した。
(d) C
The C component is combined with the V component, the Cr component, and the Mo component, precipitates carbides and acts on the hardening of the coating layer, and is mainly consumed for precipitation of vanadium carbides. However, if it is 1.6% or less, a desired effect cannot be obtained in the above-mentioned curing action of the coating layer. On the other hand, the C content necessary for all V to form carbides is V% × 12.011 (carbon atomic weight) /50.942 (vanadium atomic weight) = ( 0.236 × V% )% . However, since C forms carbides with Cr and Mo in addition to V, a C content of 0.236 XV% is insufficient for all V to form carbides. Therefore, the C content is limited to 1.6% or more and ( 0.236 × V % + 2 )% or less.

Claims

As a percentage by weight of Ni as a whole,
Fe 2.5-25%
23-50% Cr,
V to 7-20%,
Si 0.5-4.5%
C is 1.6% or more, including (0.236 × V% + 2)% or less,
Mo up to a maximum of 40% or less, (11−0.1 × Cr%)% or (125−4 × Cr%)%, whichever is greater
In addition, Ni-Cr-Mo-VC alloy with a total of 90% or less of Fe, Cr, V, and Mo is used to apply a thin metal plating on any surface to improve wear resistance and corrosion resistance. parts

A pump comprising the mechanical component according to claim 1 .

A turbine having the machine part according to claim 1 .

2. A fluid machine comprising the mechanical component according to claim 1, wherein the mechanical component is a movable blade provided in a fluid machine, and the thin metal plating is applied to a part of the movable blade .

8. A mechanical component according to claim 1, wherein the mechanical component includes a bearing provided in a fluid machine, and a sleeve that slides with the bearing, and a sliding surface of at least one of the bearing and the sleeve. A fluid machine in which the above-described deposit is applied .