STEEL AND PART

STEEL AND PART

The purpose of the present invention is to provide steel having improved hardenability, toughness, surface originated exfoliation life, and bending fatigue strength, and a component manufactured using that steel. Provided is steel having prescribed components, wherein Fn1 as defined by the following...

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Hauptverfasser: HIRAKAMI, Daisuke, TANAKA, Kosuke, NEISHI, Yutaka, YAMASHITA, Tomohiro, IMATAKA, Hideki
Format: Patent
Sprache:eng
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ALLOYS
CHEMISTRY
FERROUS OR NON-FERROUS ALLOYS
METALLURGY
TREATMENT OF ALLOYS OR NON-FERROUS METALS
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creator HIRAKAMI, Daisuke
TANAKA, Kosuke
NEISHI, Yutaka
YAMASHITA, Tomohiro
IMATAKA, Hideki
description The purpose of the present invention is to provide steel having improved hardenability, toughness, surface originated exfoliation life, and bending fatigue strength, and a component manufactured using that steel. Provided is steel having prescribed components, wherein Fn1 as defined by the following equation (1) is 0.20 - 0.65 and Fn2 as defined by the following equation (2) is 0.50 - 1.00. Fn1 = 4.2 × [Cr]/(7.0 × [Si] + 16.0 × [Mn]) ... (1) [Elements]: percent by mass of elements Fn2 = A1/A2 ... (2) A1: total surface area (µm2) of included sulfides, which have a circle equivalent diameter of 1.0 µm or greater and include 1.0 mol% or greater Ca of the total number of moles included in the sulfides, in an observed region with a total surface area of 4.0 mm2 A2: total surface area (µm2) of included sulfides, which have a circle equivalent diameter of 1.0 µm, in an observed region with a total surface area of 4.0 mm2
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Provided is steel having prescribed components, wherein Fn1 as defined by the following equation (1) is 0.20 - 0.65 and Fn2 as defined by the following equation (2) is 0.50 - 1.00. Fn1 = 4.2 × [Cr]/(7.0 × [Si] + 16.0 × [Mn]) ... (1) [Elements]: percent by mass of elements Fn2 = A1/A2 ... 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subjects ALLOYS
CHEMISTRY
FERROUS OR NON-FERROUS ALLOYS
METALLURGY
TREATMENT OF ALLOYS OR NON-FERROUS METALS
title STEEL AND PART
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