Nippon Steel Corporation

Floadia Corporation

Disco Corporation

Tdk Corporation

Shinji Yoshida

Yuji Arai

Hiroki Kamitani

Atsushi Soma

Yasuhiro Taniguchi

Yasuhiko Kawashima

Fukuo Owada

Kazumasa Yanagisawa

Kosuke Okuyama

Daisuke Okada

Shoji Yoshida

Seiya Okada

Keiichi Kondo

Atsushi Tada

Yasukuni Nomura

Ko Yanagihara

Osamu Nagai

Koji Hashimoto

Yutaka Shinagawa

Takuya Matsumoto

Takanori Tanaka

Hideo Kasai

Takafumi Kato

Satoshi Noda

Yusaku Ito

Ryotaro Sakurai

Yohei Otome

Hirohide Yano

Tatsuro Toya

Shuichi Sato

Nobuaki Komatsubara

Hideki Mitsunari

Takuya Okamura

Kuniaki Itoh

Takanori Yamaguchi

Teruo Hatada

Tetsuya Muraya

The steel material according to the present disclosure has a chemical composition consisting of, in mass %, C: more than 0.20 to 0.35%, Si: 0.05 to 1.00%, Mn: 0.02 to 1.00%, P: 0.025% or less, S: 0.0100% or less, Al: 0.005 to 0.100%, Cr: 0.40 to 1.50%, Mo: 0.30 to 1.50%, Ti: 0.002 to 0.050%, B: 0.0001 to 0.0050%, N: 0.0100% or less and O: 0.0100% or less, with the balance being Fe and impurities, and satisfies Formula (1) and Formula (2) described in the description. The yield strength is 862 MPa or more. A numerical proportion of precipitates having an equivalent circular diameter within a range of 20 to 300 nm among precipitates having an equivalent circular diameter of 20 nm or more in the steel material is 0.85 or more.

Steel material suitable for use in sour environment

The steel material according to the present disclosure has a chemical composition consisting of, in mass %, C: 0.15 to 0.45%, Si: 0.05 to 1.00%, Mn: 0.01 to 1.00%, P: 0.030% or less, S: 0.0050% or less, Al: 0.005 to 0.100%, Cr 0.60 to 1.80%, Mo: 0.80 to 2.30%, Ti: 0.002 to 0.020%, V: 0.05 to 0.30%, Nb: 0.002 to 0.100%, B: 0.0005 to 0.0040%, Cu: 0.01 to 0.50%, Ni: 0.01 to 0.50%, N: 0.0020 to 0.0100% and O: 0.0020% or less, with the balance being Fe and impurities. The number density of BN in the steel material is 10 to 100 particles/100 μm. The yield strength of the steel material is 758 MPa or more.

Steel material and method for producing steel material

A notch detecting method for detecting a notch defined in an outer circumferential portion of a wafer includes a placing step of placing the wafer on a rotary table, an image capturing step of acquiring an image of the outer circumferential portion of the wafer, a contour data acquiring step of acquiring contour data including coordinates of a contour of the wafer, a hypothetical circle calculating step of calculating a hypothetical circle that approximates the contour of the wafer, an irregularly shaped area determining step of determining whether an irregularly shaped area exists in the outer circumferential portion of the wafer or not, and a first notch determining step of determining whether the irregularly shaped area is the notch or not.

Notch detecting method

The seamless steel pipe according to the present disclosure has a chemical composition consisting of, in mass %, C: 0.15 to 0.45%, Si: 0.05 to 1.00%, Mn: 0.01 to 1.00%, P: 0.030% or less, S: 0.0050% or less, Al: 0.005 to 0.070%, Cr: 0.30 to 1.50%, Mo: 0.25 to 2.00%, Ti: 0.002 to 0.020%, Nb: 0.002 to 0.100%, B: 0.0005 to 0.0040%, rare earth metal: 0.0001 to 0.0015%, Ca: 0.0001 to 0.0100%, N: 0.0100% or less and O: 0.0020% or less, with the balance being Fe and impurities, and satisfying Formula (1) described in the description. A predicted maximum major axis of inclusions is 150 μm or less, the predicted maximum major axis being predicted by means of extreme value statistical processing. The yield strength is within a range of 758 to 862 MPa.

Seamless steel pipe suitable for use in sour environment

A seamless steel pipe heat-treatment-finishing-treatment continuous facility includes: a heat treatment apparatus; a steel pipe inspection apparatus which performs a test for a surface defect and/or an inner defect of the seamless steel pipe, the steel pipe inspection apparatus being disposed downstream of the heat treatment apparatus; a main transfer mechanism which forms a main transfer path MT for transferring the seamless steel pipe, discharged from the heat treatment apparatus, to the steel pipe inspection apparatus disposed downstream of the heat treatment apparatus; and a first forced steel pipe-temperature reduction apparatus which forcibly reduces a temperature of the seamless steel pipe on the main transfer path MT, the first forced steel pipe-temperature reduction apparatus being disposed on the main transfer path MT at a position downstream of the heat treatment apparatus and upstream of the steel pipe inspection apparatus.

Seamless steel pipe heat-treatment-finishing-treatment continuous facility

The steel pipe according to the present disclosure contains a chemical composition consisting of, in mass %, C: 0.25 to 0.50%, Si: 0.05 to 0.50%, Mn: 0.05 to 1.00%, P: 0.025% or less, S: 0.0050% or less, Al: 0.005 to 0.100%, Cr: 0.30 to 1.50%, Mo: 0.25 to 3.00%, Ti: 0.002 to 0.050%, N: 0.0010 to 0.0100% and O: 0.0030% or less, with the balance being Fe and impurities. The steel pipe contains an amount of dissolved C within a range of 0.010 to 0.050 mass %. The tensile yield strength in the axial direction and the circumferential direction is 862 to 965 MPa, and the yield ratio in the axial direction is 90% or more. The tensile yield strength in the circumferential direction is 30 to 80 MPa higher than the compressive yield strength in the circumferential direction.

Steel pipe and method for producing steel pipe

The steel pipe according to the present disclosure contains a chemical composition consisting of, in mass %, C: more than 0.50 to 0.65%, Si: 0.05 to 0.50%, Mn: 0.05 to 1.00%, P: 0.025% or less, S: 0.0050% or less, Al: 0.005 to 0.100%, Cr: 0.30 to 1.50%, Mo: 0.25 to 3.00%, Ti: 0.002 to 0.050%, N: 0.0010 to 0.0100% and O: 0.0030% or less, with the balance being Fe and impurities. The steel pipe contains an amount of dissolved C within a range of 0.010 to 0.060 mass %. The tensile yield strength in the axial direction and the circumferential direction is 862 to 1069 MPa, and the yield ratio in the axial direction is 90% or more. The tensile yield strength in the circumferential direction is 30 to 80 MPa higher than the compressive yield strength in the circumferential direction.

The steel material according to the present disclosure has a chemical composition consisting of, in mass %, C: 0.20 to 0.35%, Si: 0.05 to 1.00%, Mn: 0.01 to 1.00%, P: 0.025% or less, S: 0.0100% or less, Al: 0.005 to 0.100%, Cr 0.25 to 0.80%, Mo: 0.20 to 2.00%, Ti: 0.002 to 0.050%, B: 0.0001 to 0.0050%, N: 0.0020 to 0.0100% and O: 0.0100% or less, with the balance being Fe and impurities, and satisfying Formula (1). A number density of precipitates having an equivalent circular diameter of 400 nm or more is 0.150 particles/&#x3bc;mor less. The yield strength is within a range of 655 to 965 MPa. A dislocation density &#x3c1; is 7.0&#xd7;10mor less.5&#xd7;Cr&#x2014;Mo-2&#xd7;(V+Ti)&#x2264;3.00&#x2003;&#x2003;(1)

It has been confirmed that even though there is a difference in the dimension of a perpendicular reference surface of a permanent magnet, there is almost no change in surface magnetic flux density, and variations in the dimension of the perpendicular reference surface do not much affect the surface magnetic flux density. Therefore, even though variations occur in the dimension of the perpendicular reference surface, variations in the characteristics of an IPM motor are prevented.

Rotating electrical machine with rotor having arc shaped permanent magnets

The steel material according to the present disclosure has a chemical composition consisting of, in mass %, C: 0.10 to 0.60%, Si: 0.05 to 1.00%, Mn: 0.05 to 1.00%, P: 0.025% or less, S: 0.0100% or less, Al: 0.005 to 0.100%, Cr: 0.20 to 1.50%, Mo: 0.25 to 1.50%, V: 0.01 to 0.60%, Ti: 0.002 to 0.050%, B: 0.0001 to 0.0050%, N: 0.0020 to 0.0100%, and O: 0.0100% or less, with the balance being Fe and impurities. A dislocation density &#x3c1; is 3.5&#xd7;10mor less. Among fine precipitates, the numerical proportion of precipitates for which a ratio of the Mo content is not more than 50% is 15% or more. The yield strength is in a range of 655 to 1172 MPa.

The steel material according to the present disclosure contains a chemical composition consisting of, in mass %, C: 0.20 to 0.50%, Si: 0.05 to 0.50%, Mn: 0.05 to 1.00%, P: 0.030% or less, S: less than 0.0050%, Al: 0.005 to 0.050%, Cr: 0.10 to 1.50%, Mo: 0.25 to 1.80%, Ti: 0.002 to 0.050%, Nb: 0.002 to 0.100%, B: 0.0001 to 0.0050%, N: 0.0070% or less and O: less than 0.0050% with the balance being Fe and impurities. A yield strength is within a range of 655 to 1069 MPa, and a yield ratio is 85% or more. A proportion of KAM values of 1&#xb0; or less is 30 area % or more.

It can be considered that a cross-sectional shape of a permanent magnet having a parallel reference surface is obtained by removing a portion from a cross-sectional shape of a permanent magnet which does not have the parallel reference. A cross-sectional area of the permanent magnet is further reduced than that of the permanent magnet which does not have the parallel reference surface. In addition, also a magnet volume of the permanent magnet is further reduced than that of the permanent magnet that does not have the parallel reference surface. The inventors have confirmed that a decrease in magnet volume induced by the parallel reference surface does not affect the characteristics of an IPM motor.

Rotating electrical machine with rotor having arch shaped permanent magnets with perpendicular reference surface

The steel material according to the present disclosure contains a chemical composition consisting of, in mass %, C: more than 0.50 to 0.80%, Si: 0.05 to 1.00%, Mn: 0.05 to 1.00%, P: 0.025% or less, S: 0.0100% or less, Al: 0.005 to 0.100%, Cr: 0.20 to 1.50%, Mo: 0.25 to 1.50%, Ti: 0.002 to 0.050%, B: 0.0001 to 0.0050%, N: 0.0100% or less and O: 0.0100% or less, with the balance being Fe and impurities. The steel material contains an amount of dissolved C within a range of 0.010 to 0.060 mass %. The steel material also has a yield strength within a range of 862 to less than 965 MPa, and a yield ratio of the steel material is 90% or more.

A micro camera is placed in an appropriate image capturing position therefor on the basis of a center-to-center distance depending on a rotational angle of a holding table. Even in the case where the center Cof a holding surface and the center Cof a wafer are displaced out of alignment with each other, allowing a position in X-axis directions of an outer circumference of the wafer to vary as the holding table rotates, a control unit can make an image capturing range of the micro camera follow the varying position of the outer circumference of the wafer. Therefore, the image capturing range of the micro camera can be determined with ease. Both a surface of the wafer and the outer circumference of the wafer can be inspected simply when two cameras are moved along the X-axis directions by a single X-axis moving mechanism.

Wafer inspecting apparatus

The steel material according to the present disclosure contains a chemical composition consisting of, in mass %, C: 0.20 to 0.50%, Si: 0.05 to 0.50%, Mn: 0.05 to 1.00%, P: 0.030% or less, S: 0.0100% or less, Al: 0.005 to 0.100%, Cr: 0.10 to 1.50%, Mo: 0.25 to 1.50%, Ti: 0.002 to 0.050%, N: 0.0100% or less and O: 0.0100% or less, with the balance being Fe and impurities. The steel material contains an amount of dissolved C within a range of 0.010 to 0.050 mass %. The steel material also has a yield strength within a range of 655 to less than 862 MPa, and a yield ratio of the steel material is 85% or more.

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Tokyo, Japan

Shinji Yoshida