|8082768||Piercing and rolling plug, method of regenerating such piercing and rolling plug, and equipment line for regenerating such piercing and rolling plug|
A piercing and rolling plug has a film composed of oxides such as Fe3O4 and FeO and Fe (metal) as being formed on the surface of the base metal by electric arc spraying using an iron wire whose main component is Fe and, owing to this film, a pl...
|8047039||Process for producing stainless steel pipe|
A process for stainless-steel pipe production which comprises piercing rolling a raw material stainless steel containing, by mass, Cr: 10-30%, to give a hollow shell, elongating rolling the hollow shell using a mandrel bar, together with a graphite-free lubricant, t...
|6210806||Martensitic stainless steel having oxide scale layers|
The martensitic stainless steel product comprises a base steel and a dual oxide scale layer on a surface of the steel, wherein the dual scale layer includes an inner scale layer containing FeCr2 O4 and Fe3 O4 as...