Abstract: An object is to provide a data collection device and the like capable of reducing a load on an IoT terminal in metadata transmission and power consumption associated with the metadata transmission. In the present invention, a controller is provided on a data collection side that collects metadata, the metadata transmitted from an IoT terminal is grasped, and the IoT terminal is instructed to reduce the transmission frequency of metadata that does not need high real-time property according to a sensor, the type of the IoT terminal, or the like. The IoT terminal transmits the metadata only at a window time (transmission timing, data size, metadata type, or the like) permitted by the metadata controller. As a result, the IoT terminal transmits the metadata only at a limited timing, and thus can reduce a transmission load and power consumption.

Abstract: A steel wire rod for a spring includes: C: 0.2 to 1.2%, Si: 1.0 to 3%, Mn: 0.1 to 2%, Cr: 3% or less (not inclusive of 0%), Al: 0.0002 to 0.005%, Ca: 0.0002 to 0.002%, Ti: 0.0003 to 0.010%, and balance: iron and unavoidable impurities. An average composition of oxide-based inclusions having a minor axis of 1 ?m or more which are present in a cross section satisfies CaO: 35% or less, Al2O3: 40% or less, SiO2: 30 to 95%, MgO: 8% or less, MnO: 5% or less, TiO2: 3 to 10%, and CaO+Al2O3+SiO2+MgO+MnO+TiO2?80%. The number of oxide-based inclusions having a minor axis of 2 ?m or more which are present in the cross section is more than 0.002 inclusions/mm2.

Abstract: This steel material for bearings includes prescribed components in the steel, the oxide inclusions in the steel that have a minor axis of 1 ?m or greater satisfying the following conditions (1) and (2). (1) The average composition contains specific respective amounts of CaO, Al2O3, SiO2, and TiO2, and CaO+Al2O3+SiO2+TiO2?60%. (2) The proportion of oxide inclusions in which TiN occurs at the interface of the oxide inclusions and the steel is 30% or more of the total of the oxide inclusions.

Abstract: Disclosed is a method for controlling a Ti concentration in a steel when manufacturing a silicon-deoxidized steel comprising 0.1 to 3% by mass of Si and 0.0001 to 0.005% by mass of Al by ladle refining of a molten steel, the method including the step of: adding an oxide including TiO2 to a slag in a ladle during the ladle refining, wherein the slag produced at end of the ladle refining satisfies formulas (1) to (7) below: 0.5?CaO/SiO2?1.8??(1) 4% by mass?Al2O3?20% by mass??(2) MgO?15% by mass??(3) 1.5% by mass?TiO2?10% by mass??(4) CaO+SiO2+Al2O3+MgO+TiO2?90% by mass??(5) 0.4?TiO2/MnO?5??(6) 1?TiO2/T.Fe?10??(7) where a compound represented by a chemical formula represents the content of the compound in percent by mass; and T.Fe represents the total concentration, in mass ratio, of Fe contained in Fe oxides in the slag.

Abstract: A steel wire rod for a spring includes: C: 0.2 to 1.2%, Si: 1.0 to 3%, Mn: 0.1 to 2%, Cr: 3% or less (not inclusive of 0%), Al: 0.0002 to 0.005%, Ca: 0.0002 to 0.002%, Ti: 0.0003 to 0.010%, and balance: iron and unavoidable impurities. An average composition of oxide-based inclusions having a minor axis of 1 ?m or more which are present in a cross section satisfies CaO: 35% or less, Al2O3: 40% or less, SiO2: 30 to 95%, MgO: 8% or less, MnO: 5% or less, TiO2: 3 to 10%, and CaO+Al2O3+SiO2+MgO+MnO+TiO2?80%. The number of oxide-based inclusions having a minor axis of 2 ?m or more which are present in the cross section is more than 0.002 inclusions/mm2.

Abstract: High cleanliness spring steel useful in manufacturing a spring with SiO2-based inclusions being extremely controlled and excellent in fatigue properties is provided. High cleanliness spring steel which is steel containing; C: 1.2% (means mass %, hereafter the same with respect to the component) or below (not inclusive of 0%), Si: 1.2-4%, Mn: 0.1-2.0%, Al: 0.01% or below (not inclusive of 0%), and the balance comprising iron with inevitable impurities, wherein; the total of oxide-based inclusions of 4 or above of L (the large diameter of an inclusion)/D (the short diameter of an inclusion) and 25 ?m or above of D and oxide-based inclusions of less than 4 L/D and 25 ?m or above of L, in the oxide-based inclusions of 25 mass % or above of oxygen concentration and 70% (means mass %, hereafter the same with respect to inclusions) or above of SiO2 content when Al2O3+MgO+CaO+SiO2+MnO=100% is presumed, out of inclusions in the steel, is 20 nos./500 g or below.

Abstract: A bearing steel material which contains 0.8-1.1 mass % C, 0.15-0.8 mass % Si, 0.1-1.0 mass % Mn, 1.3-1.8 mass % Cr, up to 0.05 mass % P (0 mass % is excluded), up to 0.015 mass % S (0 mass % excluded), 0.0002-0.005 mass % Al, 0.0002-0.0020 mass % Ca, 0.0005-0.010 mass % Ti, up to 0.0080 mass % N (0 mass % is excluded), and up to 0.0025 mass % O (0 mass % is excluded). The steel material contains oxide inclusions which have an average composition that comprises, in terms of mass %, 20-50% CaO, 20-50% Al2O3, 20-70% SiO2, and 3-10% TiO2.

Abstract: A bearing steel material which contains 0.8-1.1 mass % C, 0.15-0.8 mass % Si, 0.1-1.0 mass % Mn, 1.3-1.8 mass % Cr, up to 0.05 mass % P (0 mass % is excluded), up to 0.015 mass % S (0 mass % excluded), 0.0002-0.005 mass % Al, 0.0002-0.0020 mass % Ca, 0.0005-0.010 mass % Ti, up to 0.0080 mass % N (0 mass % is excluded), and up to 0.0025 mass % O (0 mass % is excluded). The steel material contains oxide inclusions which have an average composition that comprises, in terms of mass %, 20-50% CaO, 20-50% Al2O3, 20-70% SiO2, and 3-10% TiO2.

Abstract: A bearing steel material which contains 0.8-1.1 mass % C, 0.15-0.8 mass % Si, 0.1-1.0 mass % Mn, 1.3-1.8 mass % Cr, up to 0.05 mass % P (0 mass % is excluded), up to 0.015 mass % S (0 mass % excluded), 0.0002-0.005 mass % Al, 0.0002-0.0020 mass % Ca, 0.0005-0.010 mass % Ti, up to 0.0080 mass % N (0 mass % is excluded), and up to 0.0025 mass % O (0 mass % is excluded). The steel material contains oxide inclusions which have an average composition that comprises, in terms of mass %, 20-50% CaO, 20-50% Al2O3, 20-70% SiO2, and 3-10% TiO2.

Abstract: High cleanliness spring steel useful in manufacturing a spring with SiO2-based inclusions being extremely controlled and excellent in fatigue properties is provided. High cleanliness spring steel which is steel containing; C: 1.2% (means mass %, hereafter the same with respect to the component) or below (not inclusive of 0%), Si: 1.2-4%, Mn: 0.1-2.0%, Al: 0.01% or below (not inclusive of 0%), and the balance comprising iron with inevitable impurities, wherein; the total of oxide-based inclusions of 4 or above of L (the large diameter of an inclusion)/D (the short diameter of an inclusion) and 25 ?m or above of D and oxide-based inclusions of less than 4 L/D and 25 ?m or above of L, in the oxide-based inclusions of 25 mass % or above of oxygen concentration and 70% (means mass %, hereafter the same with respect to inclusions) or above of SiO2 content when Al2O3 +MgO+CaO+SiO2+MnO=100% is presumed, out of inclusions in the steel, is 20 nos./500 g or below.

Abstract: A steel wire rod is obtained, in which a gas flow rate during gas stirring in molten steel treatment is controlled to be 0.0005 Nm3/min to 0.004 Nm3/min per molten steel of 1 ton, thereby the rod satisfies a specified composition, and oxide base inclusions in any section including an axis line of the steel wire rod satisfy the following composition X, the inclusions having width of 2 ?m or more perpendicular to a rolling direction, wherein the number of the oxide base inclusions of the following composition A is 1 to 20, and the number of the oxide base inclusions of the following composition B is less than 1: composition X: when composition of inclusions is converted to Al2O3+MgO+CaO+SiO2+MnO=100%, Al2O3+CaO+SiO2?70% is given. composition A: when composition of inclusions is converted to Al2O3+CaO+SiO2=100%, 20%?CaO?50% and Al2O3?30% are given; and composition B: when composition of inclusions is converted to Al2O3+CaO+SiO2=100%, CaO>50% is given.

Abstract: High cleanliness spring steel useful in manufacturing a spring with SiO2-based inclusions being extremely controlled and excellent in fatigue properties is provided. High cleanliness spring steel which is steel containing; C: 1.2% (means mass %, hereafter the same with respect to the component) or below (not inclusive of 0%), Si: 1.2-4%, Mn: 0.1-2.0%, Al: 0.01% or below (not inclusive of 0%), and the balance comprising iron with inevitable impurities, wherein; the total of oxide-based inclusions of 4 or above of L (the large diameter of an inclusion)/D (the short diameter of an inclusion) and 25 ?m or above of D and oxide-based inclusions of less than 4 L/D and 25 ?m or above of L, in the oxide-based inclusions of 25 mass % or above of oxygen concentration and 70% (means mass %, hereafter the same with respect to inclusions) or above of SiO2 content when Al2O3+MgO+CaO+SiO2+MnO=100% is presumed, out of inclusions in the steel, is 20 nos./500 g or below.

Abstract: High cleanliness spring steel useful in manufacturing a spring with SiO2-based inclusions being extremely controlled and excellent in fatigue properties is provided. High cleanliness spring steel which is steel containing; C: 1.2% (means mass %, hereafter the same with respect to the component) or below (not inclusive of 0%), Si: 1.2-4%, Mn: 0.1-2.0%, Al: 0.01% or below (not inclusive of 0%), and the balance comprising iron with inevitable impurities, wherein; the total of oxide-based inclusions of 4 or above of L (the large diameter of an inclusion)/D (the short diameter of an inclusion) and 25 ?m or above of D and oxide-based inclusions of less than 4 L/D and 25 ?m or above of L, in the oxide-based inclusions of 25 mass % or above of oxygen concentration and 70% (means mass %, hereafter the same with respect to inclusions) or above of SiO2 content when Al2O3+MgO+CaO+SiO2+MnO=100% is presumed, out of inclusions in the steel, is 20 nos./500 g or below.

Abstract: High cleanliness spring steel useful in manufacturing a spring with SiO2-based inclusions being extremely controlled and excellent in fatigue properties is provided. High cleanliness spring steel which is steel containing; C: 1.2% (means mass %, hereafter the same with respect to the component) or below (not inclusive of 0%), Si: 1.2-4%, Mn: 0.1-2.0%, Al: 0.01% or below (not inclusive of 0%), and the balance comprising iron with inevitable impurities, wherein; the total of oxide-based inclusions of 4 or above of L (the large diameter of an inclusion)/D (the short diameter of an inclusion) and 25 ?m or above of D and oxide-based inclusions of less than 4 L/D and 25 ?m or above of L, in the oxide-based inclusions of 25 mass % or above of oxygen concentration and 70% (means mass %, hereafter the same with respect to inclusions) or above of SiO2 content when Al2O3+MgO+CaO+SiO2+MnO=100% is presumed, out of inclusions in the steel, is 20 nos./500 g or below.

Abstract: The present invention provides a method suitable for manufacturing a steel material for obtaining a steel wire rod with decreased amount of hard nonmetallic inclusions and improved drawability and fatigue property by adequately controlling the conditions of secondary refining and manufacturing conditions in a converter. Converter blowing is performed by taking molten iron, cold iron, and steel scrap as main raw materials to be charged into a converter, the ratio of these components based on all the main raw materials being such that the molten iron takes 96 to 100% (means wt. %, same hereinbelow), the cold iron takes 4% or less, and the steel scrap takes 2% or less, and by setting an average P concentration in all the main raw materials to 0.02% or less, and operations are carried out such that a flow rate of gas for stirring molten steel during secondary refining after completion of the converter blowing is set to 0.0005 Nm3/min or more to 0.

Abstract: A steel wire rod is obtained, in which a gas flow rate during gas stirring in molten steel treatment is controlled to be 0.0005 Nm3/min to 0.004 Nm3/min per molten steel of 1 ton, thereby the rod satisfies a specified composition, and oxide base inclusions in any section including an axis line of the steel wire rod satisfy the following composition X, the inclusions having width of 2 Am or more perpendicular to a rolling direction, wherein the number of the oxide base inclusions of the following composition A is 1 to 20, and the number of the oxide base inclusions of the following composition B is less than 1: composition X: when composition of inclusions is converted to Al2O3+MgO+CaO+SiO2+MnO=100%, Al2O3+CaO+SiO2?70% is given. composition A: when composition of inclusions is converted to Al2O3+CaO+SiO2=100%, 20%?CaO?50% and Al2O3?30% are given; and composition B: when composition of inclusions is converted to Al2O3+CaO+SiO2=100%, CaO>50% is given.

Abstract: Disclosed is a steel wire rod is a steel wire rod, wherein the number of inclusions per 100 mm2 in a cross section including the axis of the steel wire rod is five or less: the inclusions contained therein being oxide inclusions 5 ?m or more in width in the direction perpendicular to the rolling direction; and the composition thereof satisfying the expression MgO+MnO?30% (mass %, the same is applied hereunder) when Al2O3+MgO+CaO+SiO2+MnO is defined as 100% and also satisfying either the following expression (A) or (B) when Al2O3+CaO+SiO2 is defined as 100%, (A): SiO2?75%, and (B): Al2O3?35%, SiO2?10%, and CaO?10%. By reducing hard inclusions in the steel wire rod to a minimum as stated above, excellent wire-drawabil.ity and fatigue property are obtained.

Abstract: A steel sheet has a C content in the range of 0.04 to 0.25% by mass, a Si content in the range of 0.05 to 3% by mass, a Mn content in the range of 0.1 to 3% by mass, an Al content in the range of 0.01 to 2% by mass, a P content of 0.02% by mass or below and higher than 0% by mass, and a S content in the range of 0 to 0.005% by mass. The number of CaO.Al2O3 inclusions containing CaO, Al2O3, SiO2 and MgO, having a CaO content of 5% or above, a SiO2 content of 0.1% or above and an Al2O3 content of 60% or above, respectively, having major axes of 30 ?m or above, and contained in 1 kg of the steel sheet is seventy or below. The steel sheet is highly ductile and has high bore-expandability. A steel slab manufacturing method manufactures a steel slab for forming the steel sheet.

Abstract: A machine structure steel superior in chip disposability and mechanical properties which contains sulfide-type inclusions such that those particles of sulfide-type inclusions with major axes not shorter than 5 &mgr;m have an average aspect ratio not larger than 5.2 and which also contains coarse particles of sulfide-type inclusions such that the relation a/b≦0.25 is satisfied, where a denotes the number of particles of sulfide-type inclusions with major axes not shorter than 20 &mgr;m, and b denotes the number of particles of sulfide-type inclusions with major axes not shorter than 5 &mgr;m. The machine structure steel exhibits good chip disposability and mechanical properties despite its freedom from lead.