Stainless steel material for blackening heat treatment and method for manufacturing the same, and method for manufacturing black stainless steel material

JP2026090615APending Publication Date: 2026-06-02NIPPON STEEL CORPORATION

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Patent Information

Authority / Receiving Office: JP · JP
Patent Type: Applications
Current Assignee / Owner: NIPPON STEEL CORPORATION
Filing Date: 2026-03-05
Publication Date: 2026-06-02

Application Information

Patent Timeline

05 Mar 2026

Application

02 Jun 2026

Publication

JP2026090615A

IPC: C22C38/00; C23C8/14; C23C8/18; C22C38/60; C21D1/76; C21D9/46

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Application Domain

Furnace types Solid state diffusion coating

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AI Technical Summary

Technical Problem

Conventional black stainless steel materials suffer from insufficient processability, leading to cracking or peeling of the oxide film during processing, exposing the base material and reducing corrosion resistance in partially processed areas.

Method used

A stainless steel material with a specific composition and controlled oxide film characteristics is subjected to blackening heat treatment under precise atmospheric conditions, forming a dense oxide film with controlled carrier density and grain size to enhance workability and corrosion resistance.

Benefits of technology

The method produces a black stainless steel material with improved processability, minimizing base material exposure and maintaining corrosion resistance even when partially exposed during processing.

✦ Generated by Eureka AI based on patent content.

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Abstract

This invention provides a stainless steel material for blackening heat treatment that offers excellent workability, minimizes exposure of the base material during processing, and provides good corrosion resistance even if the base material is partially exposed during processing. [Solution] The composition, based on mass, contains C: 0.100% or less, Si: 1.00% or less, Mn: 0.05-1.00%, P: 0.100% or less, S: 0.100% or less, Cr: 16.00-25.00%, Ni: 1.00% or less, Cu: 1.00% or less, Mo: 2.00% or less, N: 0.100% or less, Ti: 0.08-0.50%, Nb: 0.05-0.50%, with the remainder being Fe and impurities, and the distribution number of Nb precipitates is 10 / mm 2 The above describes stainless steel material for blackening heat treatment.

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