Nippon Yakin Kogyo Co.

Kawasaki, Japan

Nippon Yakin Kogyo Co.

Kawasaki, Japan

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Patent
Nippon Yakin Kogyo Co. | Date: 2016-08-24

FeCrNiMo alloy having superior surface properties and a method for producing the same using a commonly used apparatus at low cost. The FeCrNiMo alloy has (% indicates mass %): C: 0.03%, Si: 0.15 to 0.5%, Mn: 0.1 to 1%, P: 0.03%, S: 0.002%, Ni: 20 to 32%, Cr: 20 to 26%, Mo: 0.5 to 2.5%, Al: 0.1 to 0.5%, Ti: 0.1 to 0.5%, Mg: 0.0002 to 0.01%, Ca: 0.0002 to 0.01%, N: 0.02%, O: 0.0001 to 0.01%, freely contained components of Co: 0.05 to 2% and Cu: 0.01 to 0.5%, Fe as a remainder, and inevitable impurities, wherein MgO, MgO.Al_(2)O_(3 )spinel type, and CaOAl_(2)O_(3)MgO type are contained as oxide type non-metallic inclusions, ratio of number of MgO.Al_(2)O_(3 )spinel type to all oxide type non-metallic inclusions is 50%, and CaOAl_(2)O_(3)MgO type contains CaO: 30 to 70%, Al_(2)O_(3): 5 to 60%, MgO: 1 to 30%, SiO_(2): 8%, and TiO_(2): 10%.


The sampling of raw materials in the rotary kiln, firing experiment by the experimental kiln, and water quenching experiment have been performed, and the clarification of behavior of the reduction and the growth of metal has been attempted by SEM-EDS. In the amorphous serpentine region, NiO has very high reducibility than FeO. The increase in heating temperature above 1 273 K allows the fine reduced metal to be confined in the silicate, which causes the extraction by the bromine methyl alcoholic solution to be difficult. This allows the degree of reduction to enter apparently the depression region. However, the increase in heating temperature above 1 525 K allows melt to occur, which causes the fine metal to coalesce with each other. Therefore, the degree of reduction leaves the depression region, and approaches the equilibrium values. Low-MgO and high-FeO NiO silicate is enriched by the fractional crystallization, and thereafter reduction reaction is enhanced. From the result of SEM observation that metals occur from the lower temperature in the low-MgO and high-FeO ore containing much point defect, NiO and FeO in the crystal lattice are reduced via cationic and electronic defect species, the oxygen occurred diffuses toward the crystal surface via vacancies. However, the lack of experimental data of defect chemistry in Ni-ore requires the further investigation. From the fact that the temperature of the melt occurrence coincides with the temperature of metal beginning to grow largely in SEM observation, it is confirmed that the fine metals coalesce with each other via melt to grow. © 2012 ISIJ.


A boron-containing stainless steel having excellent hot workability and weldability and a good surface quality is proposed and is a boron-containing stainless steel comprising C: 0.001~0.15 mass%, Si: 0.1~2 mass%, Mn: 0.1~2 mass%, Ni: 525 mass%, Cr: 11~27 mass%, B: 0.052.5 mass%, Al: 0.0050.2 mass%, O: 0.0001~0.01 mass%, N: 0.001~0.1 mass%, S: not more than 0.005 mass%, one or both of Mg: 0.0001~0.005 mass% and Ca: 0.0001~0.005 mass% and the remainder being Fe and inevitable impurities provided that a part of Si, Al, Mg, Ca and S is included as a non-metallic inclusion made of sulfide and/or oxysulfide.


Patent
Nippon Yakin Kogyo Co. | Date: 2012-01-04

As a stainless steel for a metal part for clothing ornament capable of working into a complicated form part and having such nonmagnetic properties that the worked part can cope with the detection through needle detecting device is provided a high-Mn austenitic stainless steel having a chemical composition comprising C: 0.02-0.12 mass%, Si: 0.05-1.5 mass%, Mn: 10.0-22.0 mass%, S: not more than 0.03 mass%, Ni: 4.0-12.0 mass%, Cr: 14.0-25.0 mass% and N: 0.07-0.17 mass%, provided that these components are contained so that cal (mass%) represented by the following equation (1) is not more than 5.5 mass%: and having a magnetic permeability of not more than 1.003 under a magnetic field of 200 kA/m.


Patent
Nippon Yakin Kogyo Co. | Date: 2014-02-21

High-Mn austenitic stainless steels having a chemical composition comprising C: 0.02-0.12 mass %, Si: 0.05-1.5 mass %, Mn: 10.0-22.0 mass %, S: not more than 0.0028 mass %, Ni: 4.0-12.0 mass %, Cr: 14.0-25.0 mass % and N: 0.07-0.17 mass % with the balance being Fe and inevitable impurities, provided that these components are contained so that cal represented by the following equation is not more than 5.5%: cal (mass %)=(Cr+0.48Si)(Ni+0.11Mn0.0101Mn^(2)+26.4C+20.1N)4.7, wherein each element symbol in the equation is a content of the respective element (mass %), and having a magnetic permeability of not more than 1.003 under a magnetic field of 200 kA/m.


Patent
Nippon Yakin Kogyo Co. | Date: 2013-04-22

An austenitic FeNiCr alloy comprises C: 0.0050.03 mass %, Si: 0.151.0 mass %, Mn: not more than 2.0 mass %, P: not more than 0.030 mass %, S: not more than 0.002 mass %, Cr: 1828 mass %, Ni: 2038 mass %, Mo: 0.103 mass %, Co: 0.052.0 mass %, Cu: less than 0.25 mass %, N: not more than 0.02 mass %, provided that PRE=Cr+3.3Mo+16N20.0 and PREH=41113.2Cr5.8Mo+0.1Mo^(2)+1.2Cu145.0 (wherein each element symbol represents a content (mass %) of each element) and has an excellent corrosion resistance in air or under a wet environment even at a surface state having an oxide film formed by a intermediate heat treatment on the way of the production process.


Patent
Nippon Yakin Kogyo Co. | Date: 2015-09-10

An austenitic FeNiCr alloy comprises C: 0.0050.03 mass %, Si: 0.174.0 mass %, Mn: not more than 2.0 mass %, P: not more than 0.030 mass %, S: not more than 0.0015 mass %, Cr: 1828 mass %, Ni: 21.532 mass %, Mo: 0.102.8 mass %, Co: 0.052.0 mass %, Cu: less than 0.25 mass %, N: not more than 0.018 mass %, Al: 0.104.0 mass %, Ti: 0.101.0 mass %, Zr: 0.010.5 mass %, and the balance being Fe and inevitable impurities; wherein Cr, Mo, N and Cu satisfy PRE=Cr+3.3Mo+16N20.0 and PREH=411-13.2Cr-5.8Mo+0.1Mo^(2)+1.2Cu145.0 and wherein Al, Ti, and Zr satisfy 0.5Al+Ti+1.5Zr1.5, and has an excellent corrosion resistance in air or under a wet environment even at a surface state having an oxide film formed by an intermediate heat treatment.


Patent
Nippon Yakin Kogyo Co. | Date: 2015-08-26

An austenitic Fe-Ni-Cr alloy comprises C: 0.0050.03 mass%, Si: 0.151.0 mass%, Mn: not more than 2.0 mass%, P: not more than 0.030 mass%, S: not more than 0.002 mass%, Cr: 1828 mass%, Ni: 2038 mass%, Mo: 0.103 mass%, Co: 0.052.0 mass%, Cu: less than 0.25 mass%, N: not more than 0.02 mass%, provided that PRE = Cr+3.3xMo+16xN 20.0 and PREH = 411-13.2xCr-5.8xMo+0.1xMo^(2)+1.2xCu 145.0 (wherein each element symbol represents a content (mass%) of each element) and has an excellent corrosion resistance in air or under a wet environment even at a surface state having an oxide film formed by a intermediate heat treatment on the way of the production process.


Patent
Nippon Yakin Kogyo Co. | Date: 2013-11-27

An austenitic Fe-Ni-Cr alloy comprises C: 0.005~0.03 mass%, Si: 0.15~1.0 mass%, Mn: not more than 2.0 mass%, P: not more than 0.030 mass%, S: not more than 0.002 mass%, Cr: 18~28 mass%, Ni: 20~38 mass%, Mo: 0.10~3 mass%, Co: 0.05~2.0 mass%, Cu: less than 0.25 mass%, N: not more than 0.02 mass%, provided that PRE = Cr+3.3xMo+16xN 20.0 and PREH = 411-13.2xCr-5.8xMo+0.1xMo^(2)+1.2xCu 145.0 (wherein each element symbol represents a content (mass%) of each element) and has an excellent corrosion resistance in air or under a wet environment even at a surface state having an oxide film formed by a intermediate heat treatment on the way of the production process.


High-Mn austenitic stainless steels having a chemical composition comprising C: 0.02-0.12 mass %, Si: 0.05-1.5 mass %, Mn: 10.0-22.0 mass %, S: not more than 0.0028 mass %, Ni: 4.0-12.0 mass %, Cr: 14.0-25.0 mass % and N: 0.07-0.17 mass % with the balance being Fe and inevitable impurities, provided that these components are contained so that cal represented by the following equation is not more than 5.5%: cal (mass %)=(Cr+0.48Si)(Ni+0.11Mn0.0101Mn^(2)+26.4C+20.1N)4.7, wherein each element symbol in the equation is a content of the respective element (mass %), and having a magnetic permeability of not more than 1.003 under a magnetic field of 200 kA/m.

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