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    • 2. 发明专利
    • Heat resistant steel for exhaust valve
    • 排气阀耐热钢
    • JP2011219864A
    • 2011-11-04
    • JP2011068359
    • 2011-03-25
    • Daido Steel Co LtdHonda Motor Co Ltd大同特殊鋼株式会社本田技研工業株式会社
    • OSAKI MOTOTSUGUUEDA SHIGENORITSUYUNASHI TAKASHI
    • C22C38/00C22C38/58
    • C22C38/02C21D9/0068C22C38/001C22C38/44C22C38/48C22C38/58F01L3/02F01L2103/00F01L2820/00
    • PROBLEM TO BE SOLVED: To provide a heat resistant steel for an exhaust valve which is relatively low in Ni content an high in mechanical characteristics (for example, tensile strength, fatigue strength, abrasion resistance, hardness, etc.) at a high temperature, and excellent in corrosion resistance.SOLUTION: The heat resistant steel for an exhaust valve comprising the following configuration. (1) The head resistant steel for an exhaust valve comprises, by mass, more than 0.50% but less than 0.80% of C, more than 0.30% but less than 0.60% of N, 17.0% or more but less than 25.0% of Cr, 4.0% or more but less than 12.0% of Ni, 7.0% or more but less than 14.0% of Mn, 2.0% or more but less than 6.0% of Mo, more than 0.5% but less than 1.5% of Si, and 0.025% or more but less than 1.0% of Nb with the balance composed of Fe and unavoidable impurities and has a composition in which a content of P is regulated to less than 0.03 mass%. (2) The head resistant steel for an exhaust valve satisfies 0.85≤C+N≤1.3% by bass. (3) The head resistant steel for an exhaust valve satisfies 0.05≤Nb/C
    • 要解决的问题:为了提供一种排气门用耐热钢,其Ni含量相对较低,机械特性(例如拉伸强度,疲劳强度,耐磨性,硬度等)具有高的机械特性 耐高温,耐腐蚀性好。

      解决方案:用于排气门的耐热钢,其包括以下构造。 (1)排气门用耐磨钢,其质量分数为C以上的0.50%以上且0.80%以下,N:0.01%以上且0.60%以下,17.0%以上且25.0%以下 Cr,4.0%以上且小于12.0%的Ni,7.0%以上且小于14.0%的Mn,2.0%以上且小于6.0%的Mo,超过0.5%,但小于1.5%的Si, 和0.025%以上且小于1.0%的余量由Fe和不可避免的杂质组成,并且具有将P含量调节至小于0.03质量%的组成。 (2)排气门用耐头钢,低音为0.85≤C+N≤1.3%。 (3)排气门用耐头钢满足0.05≤Nb/ C <1.8。 版权所有(C)2012,JPO&INPIT

    • 3. 发明专利
    • Heat resistant steel for exhaust valve and method for producing the same
    • 用于排气阀的耐热钢及其制造方法
    • JP2010280950A
    • 2010-12-16
    • JP2009135020
    • 2009-06-04
    • Daido Steel Co LtdHonda Motor Co Ltd大同特殊鋼株式会社本田技研工業株式会社
    • OSAKI MOTOTSUGUUEDA SHIGENORIKURATA SEIJITSUYUNASHI TAKASHI
    • C22C38/00C21D9/00C22C38/58
    • PROBLEM TO BE SOLVED: To provide a heat resistant steel for an exhaust valve, which has high high-temperature mechanical strength and satisfactory hot workability, and to provide a method for producing the heat resistant steel for an exhaust valve.
      SOLUTION: The heat resistant steel for an exhaust valve is composed of a high nitrogen-high Cr austenitic steel which contains 0.50 to 0.90% C and 15.0 to 25.0% Cr as additional elements comprising essential additional elements and optional additional elements which can be optionally contained, wherein fine carbides and/or fine carbonitrides are at least precipitated into crystal grains in a dispersed manner. As the essential additional elements, C, Cr, N, Mn, Ni and P are contained, and, as the optional additional elements, Nb, Ti, Si, W, Mo, V, Co, B, Zr, Mg, Ca and Cu are contained in an amount of prescribed mass%. The heat resistant steel for an exhaust valve is produced through: a forging step; a solid solution heat treatment step where, after holding in the temperature range of 1,000 to 1,200°C, oil cooling is performed; and a step where aging treatment is performed in the temperature range of 700 to 800°C.
      COPYRIGHT: (C)2011,JPO&INPIT
    • 要解决的问题:提供一种具有高的机械强度和良好的热加工性的排气门用耐热钢,并提供一种用于排气阀的耐热钢的制造方法。 解决方案:用于排气阀的耐热钢由含有0.50-0.90%C和15.0-25.0%Cr的高氮高Cr奥氏体钢构成,作为附加元素,包括必需的附加元素和任选的附加元素,其可以 任选地含有,其中微细碳化物和/或细碳氮化物至少以分散的方式沉淀在晶粒中。 作为必需的附加元素,含有C,Cr,N,Mn,Ni和P,并且作为任选的附加元素,Nb,Ti,Si,W,Mo,V,Co,B,Zr,Mg,Ca和 Cu的含有量为规定质量%。 用于排气阀的耐热钢通过以下方式制造:锻造步骤; 固溶热处理工序,在保持在1000〜1200℃的温度范围内进行油冷却; 以及在700〜800℃的温度范围进行时效处理的工序。 版权所有(C)2011,JPO&INPIT
    • 6. 发明专利
    • Ni基耐熱合金の鍛造加工方法
    • 镍基耐热合金的锻造方法
    • JP2015054332A
    • 2015-03-23
    • JP2013187763
    • 2013-09-10
    • 大同特殊鋼株式会社Daido Steel Co Ltd
    • SAKURAI SHINGOOSAKI MOTOTSUGUMASUNAGA ATSUROYAMASHITA KENTA
    • B21J5/00B21J1/04C22C19/05C22F1/10
    • 【課題】Ni基耐熱合金から成る直径200mm超の太径の円柱状の鍛造品を加工形成することができ、且つ中心部に到るまで結晶を微細化することのできる鍛造加工方法を提供する。【解決手段】Ni基耐熱合金から成る被処理材に対して、前加工としての粗鍛造加工と、仕上げ鍛造加工とを行う。粗鍛造加工では、被処理材に対し圧下率20%以上の据込と、鍛伸とを2回以上繰り返し行うとともに、終盤工程を結晶粒の粒度調整工程として、粒度調整工程以前の据込及び鍛伸を1030〜1150℃の温度で、また終盤の粒度調整工程では据込及び鍛伸を1030〜1080℃の低温度で行って、粗鍛造加工後の被処理材の中心部の組織を鍛造品に求められる設定結晶粒度以上の結晶粒度の細粒組織とする。【選択図】なし
    • 要解决的问题:为了提供一种锻造方法,其中可以锻造形成包括Ni基耐热合金的直径大于200mm的直径的圆柱形锻造产品,并且可以将晶体小型化直到达到中心 。解决方案:锻造方法的特征在于,对包含Ni基耐热合金的工件进行锻造和精锻。 在粗锻中,以20%以上的压下率进行镦锻和齿槽重复进行两次以上的加工。 此外,在末端工序中,晶粒细化工序之前的镦锻和齿槽作为晶粒的晶粒细化工序在1030〜1150℃的温度下进行,镦锻和齿槽化在1030℃的低温下进行 -1080℃,晶粒细化步骤结束。 由此,粗锻​​后的工件的中心部分的结构形成为具有锻造产品所要求的凝固晶粒尺寸的晶粒尺寸的微细结构。