Daido Steel Co.

Nagoya, Japan

Daido Steel Co.

Nagoya, Japan
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Patent
Daido Steel Co. | Date: 2017-08-02

The present invention relates to a method for manufacturing a round-rod shaped alloy ingot by hot forging, containing suspending a primary alloy ingot having a round-rod shape in a columnar mold while one end of the primary alloy ingot is held, pouring a molten metal formed of a heat-retaining metal into the columnar mold so as to apply a coating of the heat-retaining metal to the entire circumference of the primary alloy ingot, to obtain a forging alloy ingot, taking the forging alloy ingot out from the columnar mold, then subjecting the forging alloy ingot to a hot forging while an end portion of the forging alloy ingot is gripped as a gripping portion, and removing the coating of the heat-retaining metal.


Patent
Daido Steel Co. | Date: 2017-03-01

The present invention relates to a steel and a mold constituted of the steel, in which the steel contains as essential elements, in terms of % by mass, 0.58%C0.70%, 0.010%Si0.30%, 0.50%Mn2.00%, 0.50%Cr<2.0%, 1.8%Mo3.0%, and 0.050%


Patent
Daido Steel Co. | Date: 2017-01-24

The present invention relates to a method for manufacturing a round-rod shaped alloy ingot by hot forging, containing suspending a primary alloy ingot having a round-rod shape in a columnar mold while one end of the primary alloy ingot is held, pouring a molten metal formed of a heat-retaining metal into the columnar mold so as to apply a coating of the heat-retaining metal to the entire circumference of the primary alloy ingot, to obtain a forging alloy ingot, taking the forging alloy ingot out from the columnar mold, then subjecting the forging alloy ingot to a hot forging while an end portion of the forging alloy ingot is gripped as a gripping portion, and removing the coating of the heat-retaining metal.


Patent
Intermetallics Co. and Daido Steel Co. | Date: 2017-04-05

The purpose of the present invention is to provide an RFeB system sintered magnet which has a high and uniform level of coercivity over the entirety of the single magnet even if the magnet is comparatively thick. The present invention is an RFeB system sintered magnet in which a heavy rare-earth element R^(H) which is at least one kind of rare-earth element selected from the group of Dy, Tb and Ho is diffused into a base material through the grain boundaries of the same base material made of a sintered compact of an RFeB system magnet containing R^(L), Fe and B, where R^(L) represents a light rare-earth element which is at least one kind of rare-earth element selected from the group of Nd and Pr, wherein: the size of the RFeB system sintered magnet at a smallest-size portion is greater than 3 mm; the amount of heavy rare-earth element R^(H) contained in the RFeB system sintered magnet divided by the volume of the RFeB system sintered magnet is equal to or greater than 25 mg/cm^(3); and the difference between a local coercivity at the surface of the smallest-size portion and a local coercivity in the central region of the smallest-size portion is equal to or less than 15 % of the local coercivity at the surface.


Patent
Daido Steel Co. and Denso Corporation | Date: 2017-01-11

The present invention provides an age hardening type bainitic microalloyed steel having a composition which includes, in terms of mass%: 0.06-0.35% of C; 0.01-2.00% of Si; 0.10-3.00% of Mn; 0.001-0.200% of S; 0.001-2.00% of Cu; 0.40-3.00% of Ni; 0.10-3.00% of Cr; 0.10-1.00% of Mo; 0.10-1.00% of V; and 0.001-0.100% of s-Al, with the remainder being Fe and unavoidable impurities, and which satisfies a value of the following expression (1) to be 20 or larger and a value of the following expression (2) to be 0.82 or larger:


Patent
Daido Steel Co. | Date: 2017-08-23

The present invention relates to an Ni-based superalloy for hot forging, containing, in terms of % by mass, C: more than 0.001 % and less than 0.100%, Cr: 11% or more and less than 19%, Co: more than 5% and less than 25%, Fe: 0.1% or more and less than 4.0%, Mo: more than 2.0% and less than 5.0%, W: more than 1.0% and less than 5.0%, Nb: 2.0% or more and less than 4.0%, Al: more than 3.0% and less than 5.0%, and Ti: more than 1.0% and less than 3.0%, with the balance being unavoidable impurities and Ni, in which the component composition satisfies the following two relationships: 3.5 ([Ti]+[Nb])/[Al]10 < 6.5 and 9.5 [Al]+[Ti]+[Nb] < 13.0.


Patent
Daido Steel Co. | Date: 2017-08-23

The present invention relates to an Ni-based superalloy for hot forging, containing, in terms of % by mass, C: more than 0.001 % and less than 0.100%, Cr: 11% or more and less than 19%, Co: more than 5% and less than 25%, Fe: 0.1% or more and less than 4.0%, Mo: more than 2.0% and less than 5.0%, W: more than 1.0% and less than 5.0%, Nb: 0.3% or more and less than 4.0%, Al: more than 3.0% and less than 5.0%, Ti: more than 1.0% and less than 3.0%, and Ta: 0.01 % or more and less than 2.0%, with the balance being unavoidable impurities and Ni, in which the component composition satisfies the following two relationships: 3.5 ([Ti]+[Nb]+[Ta])/[Al]10 < 6.5 and 9.5 [Al]+[Ti]+[Nb]+[Ta] < 13.0.


Patent
Daido Steel Co. and Denso Corporation | Date: 2015-03-03

The present invention provides an age hardening type bainitic microalloyed steel having a composition which includes, in terms of mass %: 0.06-0.35% of C; 0.01-2.00% of Si; 0.10-3.00% of Mn; 0.001-0.200% of S; 0.001-2.00% of Cu; 0.40-3.00% of Ni; 0.10-3.00% of Cr; 0.10-1.00% of Mo; 0.10-1.00% of V; and 0.001-0.100% of s-Al, with the remainder being Fe and unavoidable impurities, and which satisfies a value of the following expression (1) to be 20 or larger and a value of the following expression (2) to be 0.82 or larger: 3[C]+10[Mn]+2[Cu]+2[Ni]+12[Cr]+9[Mo]+2[V]expression (1); 1.66[C]+0.18[Si]+0.27[Mn]+0.09[Ni]+0.32[Cr]+0.34[Mo]+0.44[V]expression (2), in which each [ ] in the expression (1) and the expression dicates a content of the element shown therein in terms of mass %.


The present invention relates to a part obtained from an age hardening type bainitic microalloyed steel, a process for producing the part, and the age hardening type bainitic microalloyed steel. In particular, the present invention relates to a part which has been controlled so as to have higher values of strength than conventional parts, a process for producing the part, and the age hardening type bainitic microalloyed steel.


Patent
Daido Steel Co. | Date: 2017-09-13

The present invention relates to a mold steel having a composition including, in terms of mass%: 0.220%C0.360%; 0.65%Si<1.05%; 0.43%Mn0.92%; 0.43%Ni0.92%; 0.67%0.5Mn+Ni1.30%; 10.50%Cr<12.50%; 0.05%Mo<0.50%; 0.002%V<0.50%; 0.001%N<0.160%; and 0.300%C+N0.420%, with the remainder being Fe and unavoidable impurities.

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