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: 2017-05-17

A plurality of water removing nozzles of a water removing apparatus comprise one or more of a single far water removing nozzle and a far water removing nozzle group. The single far water removing nozzle forms a far end water removal single area that does not include one end but includes the other end in the width direction of a steel sheet conveyance plane. The far water removing nozzle group forms the far end water removal single area and one or more inner water removal single areas that do not include either end in the width direction of the steel sheet conveyance plane, in such a manner that the far end water removal single area and the one or more inner water removal single areas are aligned in order from the one end side to the other end side while overlapping with each other in the width direction of the steel sheet conveyance plane and aligned in order from the upstream side to the downstream side without overlapping in the conveyance direction.


Patent
Nippon Steel & Sumitomo Metal Corporation | Date: 2017-02-02

Provided is a method for manufacturing a hot stamped body, 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: 2017-05-24

A method for producing a forged crankshaft includes: a preforming step of forming a preformed blank (31) with no flash, the preformed blank including a shape of the crankshaft, wherein the crank arm have excess projecting portions (Aaa, Aba) at an outer peripheries of side portions of the crank arm (A) near the crank pin (P); a die forging step of forming a forged blank with flash (32) by pressing the preformed blank (31) with a pair of first dies; and a trimming step of removing the flash (32a) from the forged blank (32). In the die forging step, while a second die (20) is abutted against a journal (J)-side surface of the crank arm (A) and holds the surface, the excess projecting portions (Aaa, Aba) of the crank arm (A) are deformed by the first dies so as to increase the side portions (Aa, Ab) of the crank arm (A) in thickness. This allows for a simple and higher-yield production process of a forged crankshaft having reduced weight and sufficient stiffness.


Patent
Nippon Steel & Sumitomo Metal Corporation | Date: 2017-05-24

Each of Crank arms (A) of a crankshaft has an asymmetric shape with respect to a crank arm centerline (Ac) connecting an axis of the crank pin (P) to an axis of the journal (J), and each of the crank arms has a maximum flexural rigidity at a point of time when the load onto the crank pin due to the combustion pressure reaches a maximum. When each of the crank arms (A) is divided by the crank arm centerline (Ac) into a right arm portion (Ar) and a left arm portion (Af), in each section of each of the crank arms (A) on a plane perpendicular to the crank arm centerline (Ac) at a position outward of the axis of the crank pin (P), an area moment of inertia of one of the right and the left arm portions that is in a side that is subjected to the maximum load is greater than an area moment of inertia of the other arm portion that is in a side opposite to the side that is subjected to the maximum load, and in each section of each of the crank arms (A) on a plane perpendicular to the crank arm centerline at a position inward of the axis of the crank pin (P), the area moment of inertia of the arm portion that is in the side opposite to the side that is subjected to the maximum load is greater than the area moment of inertia of the arm portion that is in the side that is subjected to the maximum load. The crankshaft has an increased flexural rigidity and a reduced weight.


Patent
Nippon Steel & Sumitomo Metal Corporation | Date: 2017-05-24

A steel product has: a chemical composition represented by, in mass%, C: 0.050% to 0.35%, Si: 0.50% to 3.0%, Mn: exceeding 3.0% to 7.5% or less, P: 0.05% or less, S: 0.01% or less, sol. Al: 0.001% to 3.0%, N: 0.01% or less, V: 0% to 1.0%, Ti: 0% to 1.0%, Nb: 0% to 1.0%, Cr: 0% to 1.0%, Mo: 0% to 1.0%, Cu: 0% to 1.0%, Ni: 0% to 1.0%, Ca: 0% to 0.01%, Mg: 0% to 0.01%, REM: 0% to 0.01%, Zr: 0% to 0.01%, B: 0% to 0.01%, Bi: 0% to 0.01%, and the balance: Fe and impurities; and a metal structure in which a thickness of a decarburized ferrite layer is 5 m or less and a volume ratio of retained austenite is 10% to 40%, wherein tensile strength is 980 MPa or more.


Patent
Nippon Steel & Sumitomo Metal Corporation | Date: 2017-05-24

A crankshaft includes journals (J) that define a central axis of rotation, crank pins (P) that are eccentric with respect to the journals (J), and crank arms (A) connecting the journals (J) and the crank pins (P). A load due to combustion pressure is applied to each of the crank pins (P) via a connecting rod in a direction from the axis of a piston pin to the axis of the crank pin (P). Each of the crank arms (A) includes a recess (10) in a surface adjacent to the journal (J), in a region inward of a peripheral region (11) along the edge of the surface. The recess (10) extends along the peripheral region (11), and is asymmetric with respect to a crank arm centerline (Ac) connecting the axis of the crank pin (P) to the axis of the journal (J). Each of the crank arms (A) has a maximum flexural rigidity at a point of time when the load onto the crank pin (P) due to the combustion pressure reaches a maximum. The crankshaft has a reduced weight and an increased torsional rigidity in combination with an increased flexural rigidity.


Patent
Nippon Steel & Sumitomo Metal Corporation | Date: 2017-05-24

The object is to produce with good reproducibility an epitaxial silicon carbide wafer having a high quality silicon carbide single crystal thin film with little step bunching. To achieve this object, for etching the silicon carbide single crystal substrate in the epitaxial growth furnace, hydrogen carrier gas and silicon-based material gas are used. After the etching treatment is finished as well, the epitaxial growth conditions are changed in the state in the state supplying these gases. When the conditions stabilize, a carbon-based material gas is introduced for epitaxial growth.


Patent
Nippon Steel & Sumitomo Metal Corporation | Date: 2017-05-31

Provided is a low alloy oil-well steel pipe having a yield strength of 827 MPa or more, and an excellent SSC resistance. The low alloy oil-well steel pipe according to the present invention consisting of: in mass%, C: more than 0.35 to 0.65%; Si: 0.05 to 0.50%; Mn: 0.10 to 1.00%; Cr: 0.40 to 1.50%; Mo: 0.50 to 2.00%; V: 0.05 to 0.25%; Nb: 0.01 to 0.040%; sol.Al: 0.005 to 0.10%; N: 0.007% or less; Ti: 0 to 0.012%; Ca: 0 to 0.005%; and a balance being Fe and impurities, the impurities including: P: 0.020% or less; S: 0.002% or less; O: 0.006% or less; Ni: 0.10% or less; Cu: 0.03% or less; and B: 0.0005% or less, wherein in a microstructure, a number of cementite particles each of which has an equivalent circle diameter of 200 nm or more is 200 particles/100 m^(2) or more, and a yield strength is 827 MPa or more.


A ferritic stainless steel, which has excellent heat exchange properties, corrosion resistance and brazing property of the heat exchanger component, and a heat exchanger using the ferritic stainless steel are provided. The ferritic stainless steel includes, in a mass%, C: 0.030% or less, N: 0.020% or less, Si: 0.5% or less, Mn: 1.0% or less, P: 0.05% or less, S: 0.01% or less, Cr: 16% to 25%, Nb: 0.05% to 1.0%, Al: 0.003% to 0.20%, and a balance composed of Fe and unavoidable impurities. The Al oxide is present on the surface of the material, the surface coverage ratio by the Al oxide is 5% to 70%, the surface roughness in Ra measured by red laser is 0.010 m to 0.15 m, and the thickness from the surface to the point, which includes the value of a half peak of the Al content on the surface, satisfies 300 nm or less, the value of a half peak of the Al content being obtained from an elemental profile expressed by a cation ratio.


Patent
Nippon Steel & Sumitomo Metal Corporation | Date: 2017-05-31

A manufacturing method of a non-oriented electrical steel sheet comprising:performing hot rolling of a slab consisting of specific elements to obtain a hot-rolled steel sheet;performing cold rolling of the hot-rolled steel sheet to obtain a cold-rolled steel sheet;performing cold-rolled sheet annealing of the cold-rolled steel sheet under a condition in which a first soaking temperature is not lower than 950C nor higher than 1100C, a soaking time period is 20 seconds or longer, and an average cooling rate from the first soaking temperature to 700C is 20C/sec or more; andafter the cold-rolled sheet annealing, performing finish annealing of the cold-rolled steel sheet under a condition in which a second soaking temperature is not lower than 400C nor higher than 800C, a soaking time period is not shorter than 10 minutes nor longer than 10 hours, and an average cooling rate from the second soaking temperature to 300C is not less than 0.0001C/sec nor more than 0.1C/sec, anda value of a parameter Q represented by Q = ([Ti]/48 + [V]/51 + [Zr]/91 + [Nb]/93)/([C]/12) is not less than 0.9 nor more than 1.1, where contents of Ti, V, Zr, Nb, and C (mass%) in the slab are represented as [Ti], [V], [Zr], [Nb], and [C] respectively.

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