STEEL FOR MECHANICAL STRUCTURES HAVING EXCELLENT GRAIN SIZE PROPERTIES

To provide a steel for mechanical structures that can inhibit the coarsening of crystal grains during carburization.SOLUTION: A steel for mechanical structures having excellent grain size properties comprises, in mass%, C: 0.27-0.45%, Si: 0.1-0.9%, Mn: 0.1-0.6%, P (as unavoidable impurities): 0.030%...

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Bibliographische Detailangaben
Hauptverfasser:	HASHIMOTO KAZUYA, IDEGUCHI TAKAHIRO
Format:	Patent
Sprache:	eng ; jpn
Schlagworte:	ALLOYS CHEMISTRY FERROUS OR NON-FERROUS ALLOYS METALLURGY TREATMENT OF ALLOYS OR NON-FERROUS METALS
Online-Zugang:	Volltext bestellen
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Beschreibung
Zusammenfassung:	To provide a steel for mechanical structures that can inhibit the coarsening of crystal grains during carburization.SOLUTION: A steel for mechanical structures having excellent grain size properties comprises, in mass%, C: 0.27-0.45%, Si: 0.1-0.9%, Mn: 0.1-0.6%, P (as unavoidable impurities): 0.030% or less, S (as unavoidable impurities): 0.030% or less, Cr: 1.50-2.50%, Mo: 0.1-0.3%, Al: 0.005-0.050%, N: 0.004-0.030%, with the balance being Fe and inevitable impurities. The steel is in an annealed state. The area ratio of lamellar pearlite is 3% or less.SELECTED DRAWING: None 【課題】浸炭時の結晶粒粗大化を抑制することが可能な機械構造用鋼の提供。【解決手段】質量％で、Ｃ：０．２７～０．４５％、Ｓｉ：０．１～０．９％、Ｍｎ：０．１～０．６％、Ｐ（不可避不純物として）：０．０３０％以下、Ｓ（不可避不純物として）：０．０３０％以下、Ｃｒ：１．５０～２．５０％、Ｍｏ：０．１～０．３％、Ａｌ：０．００５～０．０５０％、Ｎ：０．００４～０．０３０％を有し、残部Ｆｅおよび不可避的不純物からなる鋼であり、該鋼は焼なましされた状態であって、ラメラーパーライトの面積率が３％以下である、優れた結晶粒度特性を有する機械構造用鋼【選択図】なし