高クロム高コバルト系熱間ダイス鋼について

• 西村 富隆

  日本特殊鋼株式会社

書誌事項

タイトル別名

• On the High-Chromium High-Cobalt Type Steels for Hot Work Dies
• コウクロム コウコバルトケイ ネツカン ダイス コウ ニ ツイテ
• 高クロム高コバルト系熱間ダイス鋼にについて
• コウクロム コウコバルトケイ ネツカン ダイス コウ ニ ニ ツイテ

抄録

The fundamental characteristics of 12Cr-7W-0.5V-5Co (DSE) and 12Cr-7W-0.5V-10Co (DSF) type steels for hot work dies have been investigated.The results obtained are as follows:<BR>(1) Transformation temperature on heating, specific gravity, specific heat and coefficient of thermal expansion are measured, and particularly it is noticeable that the coefficients of thermal expansion show small values.<BR>(2) Secondary hardening occurs in the temperature range from 500 to 550°C, and that resistance to tempering softening becomes larger with increasing austenitizing temperature. The temperature range suitable for hardening is from 1050 to 1100°C, so the austenitizing temperature of 1050°C only is used for all tests.<BR>(3) The nose of isothermal transformation curve situates at the temperature of 750°C and 15min for DSE, and 750°C and 25min for DSF.Ms temperature is 205°C for DSE and 175°C for DSF.<BR>(4) At the testing temperature of 600°C, hardness, tensile strength and impact strength are Hv 225, 93 kg/mm₂ and 8 kg m/cm² for DSE, and Hv 270, 107 kg /mm² and 5 kg m/cm² for DSF.<BR>(5) The dimensional change of a round bar at the tempering temperature of 600°C is +0.045% for DSE and + 0.040% for DSF in the direction of diameter, and 0% for DSE and -0.010% for DSF in the direction of length.<BR>(6) The tempering at 600°C gives the best impact strength and wear resistance at room temperature.<BR>(7) When both steels are isothermally tempered for 1000 hr at 600, 650 and 700°C, hardness decreases linearly and impact strength slightly with increasing tempering time at each temperature.<BR>And in the process of these temperings, the following sequence of changes in carbides takes place: M₆C+M₇C₃→M₆C+M₇C₃+M₂₃C₆→M₆C+M₂₃C₆→₆C+M₂₃C₆+Fe₂W→M₂₃C₆+Fe₂W.<BR>(8) Resistance to heat checking is better than that of SKD5 (JIS) steel of 10W-3Cr-0.5V type.<BR>(9) Resistance to oxidation at high temperatures is very excellent as compared with SKD 5 steel.

収録刊行物

• 鉄と鋼

  鉄と鋼 50 (10), 1449-1457, 1964

  一般社団法人 日本鉄鋼協会

キーワード

• Materials Chemistry
• Metals and Alloys
• Physical and Theoretical Chemistry
• Condensed Matter Physics

詳細情報

• CRID: 1390282680104121472
• NII論文ID: 130005615340
• NII論文ID: 110001869868
• NII書誌ID: AN00151251
• DOI: 10.2355/tetsutohagane1955.50.10_1449
• ISSN: 18832954
• ISSN: 00211575
• NDL書誌ID: 9113178
• NDL書誌ID: 9113179
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I9113178
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I9113179
• Web Site: https://www.jstage.jst.go.jp/article/tetsutohagane1955/50/10/50_10_1449/_pdf
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