Ni brazing material

Abstract

The present invention provides an Ni brazing material which exhibits excellent corrosion resistance in a brazed part, while having excellent brazability.　This Ni brazing material has a component composition that contains, by mass%, 8.0-25.0% of Cr, 3.0-20.0% of Fe, 2.0-7.0% of Mo, 1.50-5.00% of B, and 0.10-1.00% C, with the balance being made up of Ni and inevitable impurities, while satisfying formula (1). (1): 2.00 ≤ B + C ≤ 5.50 In formula (1), B and C indicate the content (mass%) of each element.

Claims

1. In mass percent, Cr: 8.0-25.0%, Fe: 3.0 to 20.0%, Mo: 2.0 to 7.0%, B: 1.50–5.00%, and C: 0.10-1.00% A Ni brazing material containing (1) and having a component composition that satisfies the following formula, with the remainder being Ni and unavoidable impurities. 2.00 ≤ B + C ≤ 5.50 ... (1) Here, B and C in equation (1) represent the content (mass%) of each element.

2. In mass%, Cr: 8.0-25.0%, Fe: 6.0-20.0%, Mo: 2.0 to 7.0%, B: 1.50–5.00%, and C: 0.10-1.00% It contains, Furthermore, in mass percent, Cu: 10.0% or less, Co: 20.0% or less, Mn: 5.0% or less, W: 5.0% or less, P: 5.0% or less, Si: Contains one or more types selected from those with a concentration of 5.0% or less. A Ni brazing material having a component composition that satisfies the following equation (1), with the remainder being Ni and unavoidable impurities. 2.00 ≤ B + C ≤ 5.50 ... (1) Here, B and C in equation (1) represent the content (mass%) of each element.

3. The Ni brazing material according to claim 1 or 2, used in a heat exchanger in which at least one joint is assembled by brazing.

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