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1. US20180209939 - Surface characteristics inspection method and surface characteristics inspection apparatus for steel product

Office
United States of America
Application Number 15747383
Application Date 07.06.2016
Publication Number 20180209939
Publication Date 26.07.2018
Grant Number 10718739
Grant Date 21.07.2020
Publication Kind B2
IPC
G01N 27/90
GPHYSICS
01MEASURING; TESTING
NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
27Investigating or analysing materials by the use of electric, electro-chemical, or magnetic means
72by investigating magnetic variables
82for investigating the presence of flaws
90using eddy currents
C21D 7/06
CCHEMISTRY; METALLURGY
21METALLURGY OF IRON
DMODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING, OR OTHER TREATMENTS
7Modifying the physical properties of iron or steel by deformation
02by cold working
04of the surface
06by shot-peening or the like
C21D 11/00
CCHEMISTRY; METALLURGY
21METALLURGY OF IRON
DMODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING, OR OTHER TREATMENTS
11Process control or regulation for heat treatments
CPC
C21D 7/06
CCHEMISTRY; METALLURGY
21METALLURGY OF IRON
DMODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
7Modifying the physical properties of iron or steel by deformation
02by cold working
04of the surface
06by shot-peening or the like
G01N 27/9046
GPHYSICS
01MEASURING; TESTING
NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
27Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
72by investigating magnetic variables
82for investigating the presence of flaws
90using eddy currents
9046by analysing electrical signals
C21D 11/00
CCHEMISTRY; METALLURGY
21METALLURGY OF IRON
DMODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
11Process control or regulation for heat treatments
Applicants SINTOKOGIO, LTD.
Inventors Yoshiyasu Makino
Agents Brinks Gilson & Lione
Priority Data 2015-156263 06.08.2015 JP
Title
(EN) Surface characteristics inspection method and surface characteristics inspection apparatus for steel product
Abstract
(EN)

To provide a surface characteristics inspection method of inspecting a heat treatment on a steel product subjected to a surface treatment in a nondestructive manner. A surface characteristics inspection apparatus is used which includes an alternating-current bridge circuit, an alternating-current power supply that supplies an alternating-current power to the alternating-current bridge circuit, and an evaluation device that evaluates the surface characteristics of a subject, which is a steel product subjected to a heat treatment, based on an output signal of the alternating-current bridge circuit. Coils of a reference detector and an inspection detector in the bridge circuit are energized to produce an alternating-current magnetism to induce an eddy current in a reference subject and the subject, respectively, and the electromagnetic characteristics of the subject obtained in the state where the reference detector detects a reference state is output as a first output signal.