Ni-based self-fluxing alloy

JP7863443B2Active Publication Date: 2026-05-21SANYO SPECIAL STEEL CO LTD
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
SANYO SPECIAL STEEL CO LTD
Filing Date
2022-03-28
Publication Date
2026-05-21

AI Technical Summary

Technical Problem

Existing Ni-based self-fluxing alloys lack sufficient corrosion resistance, especially in harsh environments with sulfurous atmospheres and hydrofluoric acid, despite improvements in wear resistance and fusing properties.

Method used

A Ni-based self-fluxing alloy composition with controlled amounts of C, Si, Cr, Mo, Cu, Fe, and B, where Cu replaces Cr and Mo to maintain hardness and improve corrosion resistance, with a total Cr and Cu content exceeding 21% for enhanced resistance to sulfidation and hydrofluoric acid.

Benefits of technology

The alloy achieves a coating with excellent wear resistance, fusing properties, and corrosion resistance, maintaining hardness and toughness while reducing Cr and Mo content, thus avoiding Cr- and Mo-deficient phases that impair corrosion resistance.

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Patent Text Reader

Abstract

To provide a Ni-based self-fluxing alloy that can yield a coating film 6 with excellent wear resistance, fusibility and corrosion resistance.SOLUTION: A metal product 2 has a main part 4 and a coating film 6. The coating film 6 is composed of a Ni-based self-fluxing alloy. The Ni-based self-fluxing alloy contains C: 0.40 mass% or more and 1.00 mass% or less, Si: 3.0 mass% or more and 5.0% mass% or less, Cr: 10.0 mass% or more and 20.0% mass% or less, Mo: 4.0 mass% or less, Cu: more than 4.0 mass% and 12.0 mass% or less, Fe: 5.0 mass% or less, and B: 2.0 mass% or more and 4.0 mass% or less, with the balance being Ni and inevitable impurities.SELECTED DRAWING: Figure 1
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