Chiba, Japan

Nippon Steel & Sumitomo Metal Corporation , was formed in 2012 with the merger of Nippon Steel and Sumitomo Metal. Nippon Steel was formed in 1970 with the merger of Fuji Iron & Steel and Yawata Iron & Steel. Nippon Steel & Sumitomo Metal Corporation is the world's 2nd largest steel producer by volume as of 2012. Wikipedia.


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Patent
Nippon Steel & Sumitomo Metal Corporation | Date: 2015-05-12

A primary object of this invention is to provide a continuous casting method by which a slab of excellent internal quality can be obtained even if the casting speed is changed. In this invention, upon continuous casting with two pairs of the reduction rolls arranged along a casting direction and support rolls arranged between the reduction rolls, when a casting speed is reduced compared to a state where combination of reduction with reduction rolls at a first stage on an unsolidified portion of the slab and reduction with reduction rolls at a second stage on a solidified portion thereof is employed, the combination is switched to combination of reduction with the reduction rolls at the first stage on a portion of the slab at an end of solidification and the reduction with the reduction rolls at the second stage on the solidified portion thereof.


Patent
Nippon Steel & Sumitomo Metal Corporation | Date: 2016-10-28

The present invention provides a method for manufacturing a hot stamped body having a vertical wall, the method including: a hot-rolling step; a coiling step; a cold-rolling step; a continuous annealing step; and a hot stamping step, in which the continuous annealing step includes a heating step of heating the cold-rolled steel sheet to a temperature range of equal to or higher than Ac_(1) C. and lower than Ac_(3) C.; a cooling step of cooling the heated cold-rolled steel sheet from the highest heating temperature to 660 C. at a cooling rate of equal to or less than 10 C./s; and a holding step of holding the cooled cold-rolled steel sheet in a temperature range of 550 C. to 660 C. for one minute to 10 minutes.


Patent
Nippon Steel & Sumitomo Metal Corporation | Date: 2016-11-01

Disclosed is a press forming method press forming a workpiece between a die and a punch, while pushing the punch into the die by means of a relative motion of the die and the punch, the method includes: producing an intermediate molding (100B) having ridges (100d) formed in predetermined parts of the workpiece, and then press forming the intermediate molding (100B) into a final shape, to thereby substantially thicken and work-harden the predetermined parts of the workpiece.


Patent
Nippon Steel & Sumitomo Metal Corporation | Date: 2016-12-12

A steel sheet shape control method includes, (A) setting a target correction shape of the steel sheet at a position of an electromagnet to a curved shape, (B) measuring a steel sheet shape when electromagnetic correction is performed, (C) calculating the steel sheet shape in a nozzle position based on the steel sheet shape, (D) repeating (B) and (C) by resetting the target correction shape to a curved shape having a smaller amount of warp, (E) when the amount of warp of the steel sheet shape at the position of the nozzle is less than the upper limit value, (F) calculating vibration of the steel sheet at the position of the nozzle, and (G) adjusting a control gain of the electromagnet until amplitude of vibration is less than a second upper limit value when the amplitude of the vibration is equal to or more than the second upper limit value.


Patent
Nippon Steel & Sumitomo Metal Corporation, Sumitomo Pipe & Tube Co. and Kabushiki Kaisha Yaskawa Denki | Date: 2016-09-30

A bending apparatus has (a) a first manipulator which feeds a hollow metal blank of closed cross section in its lengthwise direction, (b) a second manipulator which supports a first support means disposed at a first position and a metal blank while feeding it, a heating means disposed at a second position downstream of the first position in the blank feed direction for heating all or part of the circumference of the blank, and a cooling means disposed at a third position downstream of the second position for cooling a portion of the heated blank, and (c) a third manipulator which constitutes a second support means disposed at a fourth position downstream of the third position in the feed direction of the blank and which moves two-dimensionally or three-dimensionally while supporting at least one location of the metal blank to bend the metal blank into a desired shape.


Patent
Nippon Steel & Sumitomo Metal Corporation | Date: 2016-12-12

A high-strength hot-dip galvanized steel sheet containing a main component, the steel sheet having at least 40 wt. % of ferrite as a main phase in terms of the volumetric ratio, and 8-60% inclusive of residual austenite, the remaining structure comprising one or more of bainite, martensite, or pearlite. Austenite particles within a range where the average residual stress (sigmaR) thereof satisfies the expression 400 MPa<=sigmaR<=200 MPa (formula (1)) are present in an amount of 50% or more in the hot-dip galvanized steel sheet. The surface of the steel sheet has a hot-dip galvanized layer containing less than 7 wt. % of Fe, the remainder comprising Zn, Al and inevitable impurities.


Patent
Nippon Steel & Sumitomo Metal Corporation | Date: 2017-04-12

[Object] To provide a hot-rolled steel sheet having excellent fatigue characteristics and workability in the rolling direction. [Solution] A hot-rolled steel sheet according to the present invention has a chemical composition consisting of, in mass%, C: 0.03 to 0.2%, Mn: 0.1 to 3.0%, P: 0.10% or less, S: 0.03% or less, Al + Si: 0.2 to 3.0%, N: more than 0% and equal to or less than 0.01%, O: more than 0% and equal to or less than 0.01%, and the balance: iron and impurities. A microstructure of the hot-rolled steel sheet contains ferrite as the main constituent, and contains hard phases constituted by martensite and/or austenite in an amount of, in area fraction, equal to or more than 3% and less than 20%, hard phases with an aspect ratio of 3 or more account for 60% or more of the hard phases present in a sheet-thickness central portion, a length in a rolling direction of the hard phases present in the sheet-thickness central portion is less than 20 m, an average aspect ratio of ferrite grains is less than 5, and the sum of X-ray random intensity ratios of <011> orientation and <111> orientation as viewed from the rolling direction is 3.5 or more, and an X-ray random intensity ratio of <001> orientation as viewed from the rolling direction is 1.0 or less.


Patent
Nippon Steel & Sumitomo Metal Corporation | Date: 2017-04-19

[Object] To provide a method for cooling a steel strip in a galvannealing furnace. The method performs mist cooling on a steel strip in a cooling zone of a galvannealing furnace and can achieve both productivity and quality. [Solution] The cooling method includes: by an adjusted cooling installation provided at an upstream side in a sheet-passing direction of the cooling installation, jetting mist to the steel strip passing through the cooling installation in a manner that an amount of mist jetted to the steel strip passing through the cooling installation is smaller in an edge portion in a width direction of the steel strip than in a center portion; by a mist suction installation provided at least at a downstream side in the sheet-passing direction of the cooling installation, sucking at least part of mist jetted to the steel strip; and cooling the steel strip at a sheet-passing speed such that, during a period between start and end of cooling of the steel strip, a temperature of the steel strip is within a film boiling temperature range and a temperature of the edge portion in the width direction of the steel strip is equal to or higher than a temperature of the center portion in at least a range of 2/3 or more from the upstream side in the sheet-passing direction of a total cooling length of the cooling installation.


Patent
Nippon Steel & Sumitomo Metal Corporation | Date: 2017-04-12

A high-strength low-alloy steel pipe for an oil well having a stable and good SSC resistance is provided. A low-alloy steel pipe for an oil well includes a chemical composition having C: not less than 0.15 % and less than 0.30 %, Si: 0.05 to 1.00 %, Mn: 0.05 to 1.00 %, P: not more than 0.030 %, S: not more than 0.0050 %, Al: 0.005 to 0.100 %, O: not more than 0.005 %, N: not more than 0.007 %, Cr: not less than 0.10 % and less than 1.00 %, Mo: more than 1.0 % and not more than 2.5 %, V: 0.01 to 0.30 %, Ti: 0.002 to 0.009 %, Nb: 0 to 0.050 %, B: 0 to 0.0050 %, Ca: 0 to 0.0050 %, and the balance being Fe and impurities, wherein the chemical composition satisfies Mo/Cr 2.0, the steel pipe has a crystal grain size number of not lower than 7.0, the steel pipe includes 50 or more particles of cementite with an equivalent circle diameter of not less than 200 nm being present in an area of 100 m^(2) of matrix, the steel pipe includes M_(2)C-based alloy carbide in a number density of not less than 25/m^(2), and the steel pipe has a yield strength of not less than 758 MPa.


Patent
Nippon Steel & Sumitomo Metal Corporation | Date: 2017-04-12

A quenching apparatus that can enhance hardenability is provided. A circulation apparatus (50) in the quenching apparatus recovers cooling fluid after the cooling fluid is used for quenching, and supplies the cooling fluid to a defoaming bath (431). A laminar flow weir (433) of a defoaming apparatus (4) partitions the defoaming bath (431) into a laminar flow bath (434) and a shallow bath (435). The laminar flow weir (433) is lower than a side wall of the laminar flow bath (434). Cooling fluid from the circulation apparatus (50) is supplied to the laminar flow bath (434), and the cooling fluid is poured into the shallow bath (435) from the laminar flow bath (434) along the laminar flow weir (433). A filter (432) is a plate shape or a sheet shape and has a mesh structure, and covers an opening in a bottom portion of the shallow bath (435). The liquid level height in the shallow bath (435) is less than the height of the laminar flow weir (433). A supply bath (441) accumulates cooling fluid that passes through the filter (432), and supplies the cooling fluid to a cooling apparatus that sprays the cooling fluid onto a metallic material.

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