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公开(公告)号:US6083455A
公开(公告)日:2000-07-04
申请号:US2881
申请日:1998-01-05
申请人: Masato Kurita , Koji Watari , Toru Kato , Harunori Kakimi , Mitsuo Uno , Masanori Sakamoto , Yoshihiko Kamada
发明人: Masato Kurita , Koji Watari , Toru Kato , Harunori Kakimi , Mitsuo Uno , Masanori Sakamoto , Yoshihiko Kamada
IPC分类号: C22C38/00 , C22C38/04 , C22C38/08 , C22C38/12 , C22C38/14 , C22C38/16 , C22C38/18 , C22C38/60 , C23C8/26 , C22C38/02
CPC分类号: C23C8/26 , C22C38/002 , C22C38/04 , C22C38/08 , C22C38/12 , C22C38/14 , C22C38/16 , C22C38/18 , C22C38/60
摘要: The present invention relates to manufacturing methods of nitrided steel parts, having high tensile strength, high fatigue strength, and excellent bending roughness, through nitriding without thermal refining, to thus-manufactured steel parts, and to steel products for nitriding, and steels for nitriding having a specific chemical composition, serving as steel stock for the manufacture of such steel parts. The chemical composition is as follows: C: over 0.20 to 0.60%, Si: 0.05 to 1.0%, Mn: 0.20 to 1.50%, P: 0.08% or less, S: 0.005 to 0.10%, Cu: 0.30% or less, Ni: 0.30% or less, Cr: 0.30% or less, Mo: 0.30% or less, V: 0.20% or less, Nb: 0.05% or less, Ti: 0.003 to 0.03%, Al: 0.08% or less, Ca: 0.005% or less, Pb: 0.30% or less, N: 0.008 to 0.030%, and the balance of Fe and unavoidable impurities. Steel products preferably have the ferrite-pearlite microstructure having a ferrite percentage of not less than 10%. Nitrided steel parts are formed from the steel products serving as steel stock therefor, and have a nitrided case formed in the surface portion thereof.
摘要翻译: 本发明涉及氮化钢部件的制造方法,具有高拉伸强度,高疲劳强度,优异的弯曲粗糙度,通过不进行热精炼的氮化,制造的钢部件,氮化用钢产品和氮化用钢 具有特定的化学成分,用作制造这种钢部件的钢坯。 化学成分如下:C:0.20〜0.60%,Si:0.05〜1.0%,Mn:0.20〜1.50%,P:0.08%以下,S:0.005〜0.10%,Cu:0.30%以下, Ni:0.30%以下,Cr:0.30%以下,Mo:0.30%以下,V:0.20%以下,Nb:0.05%以下,Ti:0.003〜0.03%,Al:0.08%以下,Ca :0.005%以下,Pb:0.30%以下,N:0.008〜0.030%,余量为Fe和不可避免的杂质。 优选钢铁产品的铁素体 - 珠光体组织的铁素体比例不小于10%。 氮化钢部件由用作钢坯的钢制品形成,并且在其表面部分形成有氮化的外壳。
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公开(公告)号:US06391124B1
公开(公告)日:2002-05-21
申请号:US09698266
申请日:2000-10-30
申请人: Hitoshi Matsumoto , Yoshihiko Kamada , Mitsuo Uno , Masato Kurita , Seiichi Koike , Mitsuo Takashima
发明人: Hitoshi Matsumoto , Yoshihiko Kamada , Mitsuo Uno , Masato Kurita , Seiichi Koike , Mitsuo Takashima
IPC分类号: C23C826
CPC分类号: C22C38/24 , C22C38/001 , C22C38/60 , C23C8/26 , F16C3/06
摘要: A non-heat treated soft-nitrided steel part respective contents of C, Si, Mn, P, Cr, Ti, V, N, Al, Pb, S and Ca of which are in specific ranges and which satisfies the following formulas (1) to (3). This part can be produced in a process of hot working, machining and soft-nitriding without any prior heat treatment, and has superior properties such as high fatigue strength and wear resistance. Fn1=−141.5(C %)−19.6(Mn %)+1280(N %)+95.6≦60 (1) Fn2=−103.8(C %)+59.1(Mn %)+850.4(N %)+360.9≧350 (2) Fn3=−13.4(C %)−3.45(Mn %)+112.7(N %)+13.2≧7 (3)
摘要翻译: C,Si,Mn,P,Cr,Ti,V,N,Al,Pb,S和Ca的不含热处理软氮化物部分的含量在特定范围内,满足下式(1 )至(3)。 该部件可以在没有任何热处理的情况下在热加工,机加工和软氮化的过程中生产,并且具有优异的性能,例如高疲劳强度和耐磨性。
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