TOOL STEEL AND METHOD FOR MANUFACTURING HIGH HARDNESS TOOL

• Main Authors: UMEMORI NAOKI, SHIMIZU TAKAYUKI, WAKATSUKI KEN
• Format: Patent
• Language: English; Japanese
• Published: 16.07.2015
• Subjects: ALLOYS; CHEMISTRY; FERROUS OR NON-FERROUS ALLOYS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS; MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS; METALLURGY; METALLURGY OF IRON; MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; TREATMENT OF ALLOYS OR NON-FERROUS METALS

PROBLEM TO BE SOLVED: To provide a tool steel capable of exhibiting high hardness with suppressing addition of alloy elements at low and a method for manufacturing a tool using the same.SOLUTION: A tool steel contains, by mass%, C:1.00 to 2.00%, Si:0.05 to 1.00%, Mn:0.20 to 1.50%, Cr:3.00 to 9.00%, Mo:0.50 to 3.00%, W:0 to 4.00%, [W]+2[Mo]:less than 9%, where [] represents content mass% of an element in [], and the balance Fe with inevitable impurities and two-stage hardening is conducted with first stage hardening by heating at 1000 to 1200°C and quickly cooling for a hardening treatment and second stage hardening for heating at 800 to less than 1050°C and quickly cooling. 【課題】合金元素の添加を少なく抑えながら高硬度を発現することのできる工具鋼及びこれを用いた工具の製造方法を提供する。【解決手段】工具鋼を質量％でＣ：1.00〜2.00％，Si：0.05〜1.00％，Mn：0.20〜1.50％，Cr：3.00〜9.00％，Mo：0.50〜3.00％，Ｗ：0〜4.00％，[Ｗ]＋2[Mo]：9％未満（但し[ ]は[ ]内の元素の含有質量％を表す）を含有し、残部Fe及び不可避的不純物の組成を有するものとし、焼入れ処理に際して１０００〜１２００℃に加熱して急冷する１段目の焼入れと、その後の８００〜１０５０℃未満の温度に加熱して急冷する２段目の焼入れとの２段階の焼入れを行う。【選択図】 なし