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1. WO2014125779 - FREE MACHINING STEEL WITH LEAD

Publication Number WO/2014/125779
Publication Date 21.08.2014
International Application No. PCT/JP2014/000486
International Filing Date 30.01.2014
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
B21B 3/02 2006.1
BPERFORMING OPERATIONS; TRANSPORTING
21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
BROLLING OF METAL
3Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences
02Rolling special iron alloys
B22D 27/04 2006.1
BPERFORMING OPERATIONS; TRANSPORTING
22CASTING; POWDER METALLURGY
DCASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
27Treating the metal in the mould while it is molten or ductile
04Influencing the temperature of the metal, e.g. by heating or cooling the mould
C21D 8/00 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
CPC
B22D 11/001
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
001of specific alloys
B22D 11/22
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
16Controlling or regulating processes or operations
22for cooling cast stock or mould
B22D 27/04
BPERFORMING OPERATIONS; TRANSPORTING
22CASTING; POWDER METALLURGY
DCASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
27Treating the metal in the mould while it is molten or ductile
04Influencing the temperature of the metal, e.g. by heating or cooling the mould
C21D 7/13
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
13by hot working
C21D 9/22
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
9Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
22for drills; for milling cutters; for machine cutting tools
C22C 38/00
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
CALLOYS
38Ferrous alloys, e.g. steel alloys
Applicants
  • 新日鐵住金株式会社 NIPPON STEEL & SUMITOMO METAL CORPORATION [JP]/[JP]
Inventors
  • 渡里 宏二 WATARI, Koji
  • 橋村 雅之 HASHIMURA, Masayuki
Agents
  • 特許業務法人 森道雄特許事務所 M. MORI PATENT FIRM
Priority Data
2013-02925618.02.2013JP
Publication Language Japanese (ja)
Filing Language Japanese (JA)
Designated States
Title
(EN) FREE MACHINING STEEL WITH LEAD
(FR) ACIER DE DÉCOLLETAGE AVEC DU PLOMB
(JA) 鉛快削鋼
Abstract
(EN) Provided is a free machining steel with lead having excellent machinability. A free machining steel with lead (1) according to an embodiment of the present invention contains, in mass%, 0.005 to 0.2% carbon (C), 0.3 to 2.0% manganese (Mn), 0.005 to 0.2% phosphorus (P), 0.01 to 0.7% sulfur (S), 0.03 to 0.5% lead (Pb), 0.004 to 0.02% nitrogen (N), and 0.003 to 0.03% oxygen (O), with the remainder comprising iron and impurities. Among free machining inclusions (8) in the steel, the ratio of the number of Pb-MnS inclusions having an equivalent circular diameter of at least 5 μm with respect to the total number of free machining inclusions (8) having an equivalent circular diameter of at least 5 μm is at least 5%. The free machining inclusions (8) are not more 200 μm long. The average of length of the free machining inclusions (8) in the steel having an equivalent circular diameter of at least 5 μm is not more than 50 μm. Among the free machining inclusions (8), there are at least 500/mm2 having an equivalent circular diameter of at least 2 μm and having an aspect ratio of not more than 10.
(FR) La présente invention concerne un acier de décolletage avec du plomb ayant une excellente usinabilité. Un acier de décolletage avec du plomb (1) selon un mode de réalisation de la présente invention contient, en % en masse, de 0,005 à 0,2 % de carbone (C), de 0,3 à 2,0 % de manganèse (Mn), de 0,005 à 0,2 % de phosphore (P), de 0,01 à 0,7 % de soufre (S), de 0,03 à 0,5 % de plomb (Pb), de 0,004 à 0,02 % d’azote (N), et de 0,003 à 0,03 % d’oxygène (O), le reste comprenant du fer et des impuretés. Parmi les inclusions de décolletage (8) dans l’acier, la proportion du nombre d’inclusions de Pb-MnS ayant un diamètre circulaire équivalent d’au moins 5 μm par rapport au nombre total d’inclusions de décolletage (8) ayant un diamètre circulaire équivalent d’au moins 5 μm est d’au moins 5 %. Les inclusions de décolletage (8) ne font pas plus de 200 μm de longueur. La moyenne de la longueur des inclusions de décolletage (8) dans l’acier ayant un diamètre circulaire équivalent d’au moins 5 μm est de pas plus de 50 μm. Parmi les inclusions de décolletage (8), il y en a au moins 500/mm2 ayant un diamètre circulaire équivalent d’au moins 2 μm et ayant un facteur de forme de pas plus de 10.
(JA)  被削性に優れた鉛快削鋼を提供する。本実施形態による鉛快削鋼(1)は、質量%で、C:0.005~0.2%、Mn:0.3~2.0%、P:0.005~0.2%、S:0.01~0.7%、Pb:0.03~0.5%、N:0.004~0.02%、及び、O:0.003~0.03%を含有し、残部はFe及び不純物からなる。鋼中の快削介在物(8)のうち、5μm以上の円相当径を有する快削介在物(8)の総数に対する5μm以上の円相当径を有するPb-MnS介在物の個数の比率は5%以上である。快削介在物(8)の長さは200μm以下である。鋼中の5μm以上の円相当径を有する快削介在物(8)の平均長さは50μm以下である。快削介在物(8)のうち、2μm以上の円相当径を有し、10以下のアスペクト比を有するものは500個/mm以上である。
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