STEEL FOR NITRIDING

• Main Authors: OFUJI YOSHIHIRO, SENDA TETSUSHI
• Format: Patent
• Language: English; Japanese
• Published: 10.12.2015
• Subjects: ALLOYS; CHEMISTRY; FERROUS OR NON-FERROUS ALLOYS; METALLURGY; TREATMENT OF ALLOYS OR NON-FERROUS METALS

PROBLEM TO BE SOLVED: To provide a steel for nitriding excellent in machinability before nitriding and capable of satisfactory fatigue strength after nitriding.SOLUTION: Provided is steel for nitriding including, by mass, 0.04 to 0.14% C, 0.02 to 0.50% Si, 1.0 to 2.0% Mn, 0.8 to 2.0% Cr, 0.10 to 0.30% V, 0.02 to 0.20% Ti, 0.01 to 0.05% Al and 0.005 to 0.05% S, in which Mo is limited to 0.04% or lower, P is limited to 0.03% or lower, N is limited to 0.010% or lower and O (oxygen) is limited to 0.002% or lower, and the balance Fe with impurities. Further, the steel may include 0.0003 to 0.003% B and 0.01 to 0.10% Nb. 【課題】窒化処理前の切削加工性に優れ、窒化処理後には良好な疲労強度を確保することが可能な、窒化用鋼を提供する。【解決手段】質量％で、Ｃ：０．０４〜０．１４％、Ｓｉ：０．０２〜０．５０％、Ｍｎ：１．０〜２．０％、Ｃｒ：０．８〜２．０％、Ｖ：０．１０〜０．３０％、Ｔｉ：０．０２〜０．２０％、Ａｌ：０．０１〜０．０５％、Ｓ：０．００５〜０．０５％を含有し、Ｍｏ：０．０４％以下、Ｐ：０．０３％以下、Ｎ：０．０１０％以下、Ｏ（酸素）：０．００２％以下に制限し、残部はＦｅ及び不純物からなることを特徴とする窒化用鋼。更に、Ｂ：０．０００３〜０．００３％、Ｎｂ：０．０１〜０．１０％を含有することができる。【選択図】なし