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1. WO2014171472 - CASE-HARDENING STEEL MATERIAL AND CASE-HARDENING STEEL MEMBER

Publication Number WO/2014/171472
Publication Date 23.10.2014
International Application No. PCT/JP2014/060800
International Filing Date 16.04.2014
IPC
C22C 38/00 2006.1
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
CALLOYS
38Ferrous alloys, e.g. steel alloys
C22C 38/60 2006.1
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
CALLOYS
38Ferrous alloys, e.g. steel alloys
60containing lead, selenium, tellurium or antimony, or more than 0.04% by weight of sulfur
B22D 11/00 2006.1
BPERFORMING OPERATIONS; TRANSPORTING
22CASTING; POWDER METALLURGY
DCASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
11Continuous casting of metals, i.e. casting in indefinite lengths
C21C 7/10 2006.1
CCHEMISTRY; METALLURGY
21METALLURGY OF IRON
CPROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
7Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/-C21C5/118
10Handling in vacuum
C21D 8/06 2006.1
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
8Modifying the physical properties by deformation combined with, or followed by, heat treatment
06during manufacturing of rods or wires
CPC
B22D 11/00
BPERFORMING OPERATIONS; TRANSPORTING
22CASTING; POWDER METALLURGY
DCASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
11Continuous casting of metals, i.e. casting in indefinite lengths
C21C 7/10
CCHEMISTRY; METALLURGY
21METALLURGY OF IRON
CPROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
7Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
10Handling in a vacuum
C21D 1/06
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
1General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
06Surface hardening
C21D 1/32
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
1General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
26Methods of annealing
32Soft annealing, e.g. spheroidising
C21D 2211/004
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
2211Microstructure comprising significant phases
004Dispersions; Precipitations
C21D 6/004
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
6Heat treatment of ferrous alloys
004containing Cr and Ni
Applicants
  • 新日鐵住金株式会社 NIPPON STEEL & SUMITOMO METAL CORPORATION [JP]/[JP]
Inventors
  • 久保田 学 KUBOTA Manabu
  • 小澤 修司 KOZAWA Shuji
Agents
  • 志賀 正武 SHIGA Masatake
Priority Data
2013-08785718.04.2013JP
Publication Language Japanese (ja)
Filing Language Japanese (JA)
Designated States
Title
(EN) CASE-HARDENING STEEL MATERIAL AND CASE-HARDENING STEEL MEMBER
(FR) MATIÈRE D'ACIER DE CÉMENTATION ET ÉLÉMENT D'ACIER DE CÉMENTATION
(JA) 肌焼用鋼材と肌焼鋼部品
Abstract
(EN) A case-hardening steel material has such a property that the predicted value of the largest diameter (√area)S of sulfide-type inclusions that exist in a predicted area (S) is 49 μm or less and the predicted value of the largest diameter (√area)Ox of oxide-type inclusions that exist in the predicted area (S) is 80 μm or less wherein the predicted area (S) is 30000 mm2 in the inclusion rating employing an extreme value statistic method, and also has such a property that the number of sulfide-type inclusions each having a length of more than 20 μm and a thickness of more than 2 μm is limited to 200 per 1 mm2.
(FR) L'invention concerne une matière d'acier de cémentation qui a une telle propriété que la valeur prévue du plus grand diamètre (√surface)S d'inclusions de type sulfure qui existent dans une surface prévue (S) est 49 µm ou moins et la valeur prévue du plus grand diamètre (√surface)Ox d'inclusions de type oxyde qui existent dans la surface prévue (S) est 80 µm ou moins dans laquelle la surface prévue (S) est 30 000 mm2 dans le classement d'inclusion employant une méthode statistique de valeurs extrêmes, et a également une telle propriété que le nombre d'inclusions de type sulfure ayant chacune une longueur de plus de 20 µm et une épaisseur de plus de 2 µm est limité à 200 par 1 mm2.
(JA)  この肌焼用鋼材は、極値統計法を用いた介在物評価において、予測面積Sを30000mmとしたとき、前記予測面積S中に存在する最大の硫化物系介在物径(√area)の予測値が49μm以下であり、前記予測面積S中に存在する最大の酸化物系介在物径(√area)Oxの予測値が80μm以下であり;20μmを超える長さ及び2μmを超える厚みを有する硫化物系介在物が1mmあたり200個以下に制限されている。
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