Metallurgically bonded stainless steel

摘要

A steel wire having a stainless steel exterior; the steel wire includes a core region that comprises at least 55 wt. % iron which is metallurgically bonded to a stainless steel coating that consists of a stainless steel region and a bonding region. The stainless steel region can have a thickness of about 1 μm to about 250 μm, and a stainless steel composition that is approximately consistent across the thickness of the stainless steel region. The stainless steel composition includes an admixture of iron and about 10 wt. % to about 30 wt. % chromium. The bonding region is positioned between the stainless steel region and the core region, has a thickness that is greater than 1 μm and less than the thickness of the stainless steel region, and has a bonding composition. The bonding composition includes an admixture of iron and chromium, with a chromium concentration proximal to the stainless steel region that is approximately equal to the chromium concentration of the stainless steel region and has a chromium concentration proximal to the core region that has less than about 5 wt. % chromium.

主权项

1. A steel wire having a stainless steel exterior, the steel wire comprising:
a core region, a bonding region and a stainless steel region; the core region metallurgically bonded to the stainless steel region by the bonding region; the core region comprising at least 55 wt. % iron; the stainless steel region having a thickness of about 5 μm to about 250 μm, having a stainless steel composition, and including the stainless steel exterior, the stainless steel composition comprising an admixture of iron and chromium, and the stainless steel composition comprising a chromium concentration of about 10 wt. % to about 30 wt. % that varies by less than 5 wt. %; and the bonding region positioned between the stainless steel region and the core region, having a thickness that is greater than 5 μm and less than the thickness of the stainless steel region, and having a bonding composition,
the bonding region further having a chromium concentration gradient that decreases from a chromium concentration, proximal to the stainless steel region, that is approximately equal to the chromium concentration of the stainless steel region, to a chromium concentration, proximal to the core region, that is approximately equal to the chromium concentration of the core region.