Disclosed is a method for producing a plated black heart malleable cast iron member including a black heart malleable cast iron member and a plating layer formed on a surface of the black heart malleable cast iron member, the method including the steps of: performing graphitization in a non-oxidizing and decarburizing atmosphere; performing a particle projection treatment on a surface of the black heart malleable cast iron member obtained after the graphitization such that silicon oxide remains on the surface; immersing the black heart malleable cast iron member obtained after the particle projection treatment in a flux for 3.0 minutes or more; and performing hot-dip plating on the black heart malleable cast iron member obtained after the immersion in the flux.

A brake disc, and a method of manufacturing the same, yield a brake disc capable of exhibiting low thermal deformation and superior wear resistance and corrosion resistance using a new composition for grey cast iron and through nitriding gas treatment thereof.

A brake disc, and a method of manufacturing the same, yield a brake disc capable of exhibiting low thermal deformation and superior wear resistance and corrosion resistance using a new composition for grey cast iron and through nitriding gas treatment thereof.

An iron-based alloy includes, in weight percent, carbon from about 2 to about 3 percent; manganese from about 0.1 to about 0.4 percent; silicon from about 0.3 to about 0.8 percent; chromium from about 11.5 to about 14.5 percent; nickel from about 0.05 to about 0.6 percent; vanadium from about 0.8 to about 2.2 percent; molybdenum from about 4 to about 7 percent; tungsten from about 3 to about 5 percent; niobium from about 1 to about 3 percent; cobalt from about 3 to about 5 percent; boron from zero to about 0.2 percent; and the balance containing iron and incidental impurities. The alloy is suitable for use in elevated temperature applications such as in valve seat inserts for combustion engines.

An austenitic cast iron including basic elements of C, Si, Cr, Ni, Mn and Cu; and the balance including Fe, inevitable impurities and/or a trace-amount modifier element, which is effective in improving a characteristic of the cast iron, in a trace amount; and structured by a base comprising an Fe alloy in which an austenite phase makes a major phase in ordinary-temperature region; wherein the basic elements fall within compositional ranges that satisfy the following conditions when the entirety of the cast iron is taken as 100% by mass: C: from 2.0 to 3.0%; Si: from 4.0 to 5.4%; Cr: from 0.8 to 2.0%; Mn: from 3.9 to 5.6%; Ni: from 17 to 22%; and Cu: from 0.9 to 1.6%.

An austenitic cast iron including basic elements of C, Si, Cr, Ni, Mn and Cu; and the balance including Fe, inevitable impurities and/or a trace-amount modifier element, which is effective in improving a characteristic of the cast iron, in a trace amount; and structured by a base comprising an Fe alloy in which an austenite phase makes a major phase in ordinary-temperature region; wherein the basic elements fall within compositional ranges that satisfy the following conditions when the entirety of the cast iron is taken as 100% by mass: C: from 2.0 to 3.0%; Si: from 4.0 to 5.4%; Cr: from 0.8 to 2.0%; Mn: from 3.9 to 5.6%; Ni: from 17 to 22%; and Cu: from 0.9 to 1.6%.

A method for producing spheroidal graphite cast iron having a specific final composition includes: subjecting a molten iron to a spheroidization treatment using a spheroidizing agent of an FeSiMgCa-based alloy containing no rare earth element; conducting an inoculation treatment using a first FeSi-based inoculant; and conducting a pouring inoculation treatment with a given amount of a second FeSi-based inoculant containing 45-75% of Si, 1-3% of Ca, and 15 ppm or less of Ba.

A method for producing spheroidal graphite cast iron having a specific final composition includes: subjecting a molten iron to a spheroidization treatment using a spheroidizing agent of an FeSiMgCa-based alloy containing no rare earth element; conducting an inoculation treatment using a first FeSi-based inoculant; and conducting a pouring inoculation treatment with a given amount of a second FeSi-based inoculant containing 45-75% of Si, 1-3% of Ca, and 15 ppm or less of Ba.

A method of manufacturing an iron casting by executing a heat treatment for a heat treatment object that is provided by using and casting an austenite-type material for casting is provided. The heat treatment includes a first holding step of holding the heat treatment object at a first holding temperature of 850 C. or higher and 1250 C. or lower, and a first cooling step of cooling the heat treatment object to a first cooling end temperature of 150 C. or higher and 150 C. or lower after the first holding step. The first holding step includes holding the heat treatment object for a first holding time of 0.25 hours or more and 100 hours or less.

A method of manufacturing an iron casting by executing a heat treatment for a heat treatment object that is provided by using and casting an austenite-type material for casting is provided. The heat treatment includes a first holding step of holding the heat treatment object at a first holding temperature of 850 C. or higher and 1250 C. or lower, and a first cooling step of cooling the heat treatment object to a first cooling end temperature of 150 C. or higher and 150 C. or lower after the first holding step. The first holding step includes holding the heat treatment object for a first holding time of 0.25 hours or more and 100 hours or less.