Member for immersion in hot dip galvanizing bath and method for producing the same
AssigneeTaiyo Steel Co., Ltd.
InventorsTakeo Nagashima, Eizo Sakuma, Katsuaki Takano
Life of this patent
Estimating the term…
Abstract
A member used in contact with a hot dip galvanizing bath, such as a sinker roll, a support roll or a bearing, is produced by nitriding stainless steel to form a nitride layer and a nitrogen-diffused layer on the surface thereof. The member used in contact with a hot dip galvanizing bath is formed on its surface with the nitride layer by nitriding it in a salt bath containing a cyanide, a cyanate, a carbonate and the like or by heat-treating it in an atmosphere containing ammonium or nitrogen.
Claims4
A hot dip galvanizing bath apparatus having a component comprising a sinker roll, a support roll or bearing and wherein said component having a nitrided layer and a nitrogen diffused layer on the surface obtained by nitriding it in a salt bath containing a cyanide, a cyanate and a carbonate and/or by heat-treating it in an atmosphere containing ammonia and/or nitrogen.
A method of using a roll or bearing as an immersion member component in a hot dip galvanizing bath apparatus wherein said roll or bearing has a nitrided layer and a nitrogen diffused layer on the surface.
A process for producing a member for immersion in a hot dip galvanizing bath which contains aluminum, comprising a step of fabricating a member for immersion in a hot dip galvanizing bath which contains aluminum, said member comprising a sinker roll, a support roll or a bearing of stainless steel as a base metal and a step of forming a nitride layer and a nitrogen-diffused layer on the surface of the member by nitriding it in a salt bath containing a cyanide, a cyanate and a carbonate and/or by heat-treating it in an atmosphere containing ammonium and/or nitrogen.
A process for producing a hot dip galvanizing bath apparatus including a roll or bearing as an immersion member component in a hot dip galvanizing bath which contains aluminum, wherein a roll or bearing has formed thereon a nitrided layer and a nitrogen diffused layer on the surface thereof by nitriding it in a salt bath containing a cyanide, a cyanate and a carbonate and/or by heat-treating it in an atmosphere containing ammonia and/or nitrogen.
Dependencies are inferred from the claim text.