Brazing alloy for stainless steel, structure braze-assembled with the brazing alloy, and brazing material for stainless steel

A brazing material for stainless steel, which is to be used for braze-joining a stainless steel component to a component composed of iron or steel including stainless steel, the brazing material comprising:

• at least one Mn-based metal layer which is composed of a Mn—Ni alloy consisting essentially of Mn and Ni or a Mn—Ni—Cu alloy consisting essentially of Mn, Ni and Cu;
• and
• at least one Ni-based metal layer which is composed of Ni, a Ni alloy consisting essentially of Ni, or a Ni—Cu alloy consisting essentially of Ni and Cu,
• wherein the Mn-based metal layer and the Ni-based metal layer are bonded to each other in a stacked relation, and an average content of each of the essential elements in any cross section perpendicular to the length of the brazing material falls within the composition range of a brazing alloy consisting essentially of Mn, Ni and Cu, and having a composition in terms of weight percentage which, when plotted on a diagram as shown in FIG. 1, falls within a range defined by:
• the point A (37% Mn, 63% Ni, 0.% Cu);
• the point B (18% Mn, 27% Ni, 55% Cu);
• the point C (42% Mn, 3% Ni, 55% Cu);
• the point D (50% Mn, 3% Ni, 47% Cu);
• and
• the point E (50% Mn, 50% Ni, 0% Cu),
• wherein Mn=50% is exclusive.

A brazing material for stainless steel, which is to be used for braze-joining a stainless steel component to a component composed of iron or steel including stainless steel, the brazing material comprising:

• a Mn-based metal layer which is composed of a Mn—Ni alloy consisting essentially of Mn and Ni or a Mn—Ni—Cu alloy consisting essentially of Mn, Ni and Cu;
• and
• two Ni-based metal layers which are each composed of Ni, a Ni alloy consisting essentially of Ni, or a Ni—Cu alloy consisting essentially of Ni and Cu,
• wherein the Ni-based metal layers are stacked on opposite sides of the Mn-based metal layer and press-bonded thereto, and an average content of each of the elements in any cross section perpendicular to the length of the brazing material falls within the composition range of a brazing alloy consisting essentially of Mn, Ni and Cu, and having a composition in terms of weight percentage which, when plotted on a diagram as shown in FIG. 1, falls within a range defined by:
• the point A (37% Mn, 63% Ni, 0% Cu);
• the point B (18% Mn, 27% Ni, 55% Cu);
• the point C (42% Mn, 3% Ni, 55% Cu);
• the point D (50% Mn, 3% Ni, 47% Cu);
• and
• the point E (50% Mn, 50% Ni, 0% Cu),
• wherein Mn=50% is exclusives.