著者

郡司 好喜

出版者

大同特殊鋼株式会社

雑誌

電気製鋼 (ISSN:00118389)

巻号頁・発行日

vol.53, no.1, pp.62-70, 1982-01-31 (Released:2009-05-25)

参考文献数

51

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Recently, the advantages of the continuous casting process of steel, which include an improved product yield, energy saving, an improved working environment and an improvement of product quality, have come to be widely recognized. An outline of the history of continuous casting process is described in the paper. The paper outlines recent developments of technologies as follows:(1) Reduction of the surface defects.(2) Reduction of the internal defects.(3) Improvement of the productivity.(4) Automation.A summary of expectations for future developments of technologies with regard to productivity and product quality is also given. Finally, attention is drawn to the future developments of horizontal continuous caster and synchronized continuous caster of steel.

著者

金川 淳 藤根 道彦 木村 泰廣

出版者

大同特殊鋼株式会社

雑誌

電気製鋼 (ISSN:00118389)

巻号頁・発行日

vol.64, no.4, pp.244-251, 1993

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Superalloy (Inconel 718) and stainless steel (SUS 316) were melted by using 300kW Electron Beam (EB) melting furnace and the evaporation behavior of elements and the effect of purification were investigated.<br>1) The evaporation behavior could be explained well by a Langmuir evaporation equation under the consideration of the vapor pressure of element and the activity in metal.<br>2) The uniformalization of the chemical composition in the longitudinal direction can not be expected because the molten pool is not so deep, and so the accurate control of EB condition is important.<br>3) In the investigation on mechanical properties of Inconel 718, creep rupture properties of EB melted material were better than those of VAR remelted material, which is considered to be caused by the purification of EB melted ingot.

著者

佐田 岳夫

出版者

大同特殊鋼株式会社

雑誌

電気製鋼 (ISSN:00118389)

巻号頁・発行日

vol.64, no.4, pp.269-275, 1993-10-15 (Released:2009-05-25)

被引用文献数

2 2

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With the diversification of culture, musical instruments have become more diversified and closer to us.Musical instruments are classified into keyboard instruments, wind instruments, stringed instruments, and percussions. Each instrument is made up of many varieties of materials.This paper takes up such major instruments as pianos, electric organs, and wind instruments and describes metallic materials used in these instruments and touches upon the role of materials in still mysterious sounds of musical instruments.

著者

水野 正志 小島 勝洋

出版者

大同特殊鋼株式会社

雑誌

電気製鋼 (ISSN:00118389)

巻号頁・発行日

vol.62, no.3, pp.167-174, 1991-07-15 (Released:2009-05-25)

参考文献数

6

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It is important to measure the torque directly for watching or controlling the torque of rotary driving system. Though various types of torque sensors were developed, most of them were designed and manufactured for experiments and were not suitable for in-line use. A new magnetostrictive torque sensor which has the advantages of compact size, light weight and high durability, then is suitable for in-line use, was developed by using the structural steel shaft. This paper presents the optimization of measuring system of this torque sensor, which was one of the important parts as well as development of the materials for sensor shaft.

著者

上仲 明郎 永田 雅

出版者

大同特殊鋼株式会社

雑誌

電気製鋼 (ISSN:00118389)

巻号頁・発行日

vol.67, no.3, pp.155-160, 1996

被引用文献数

2

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Influence of silicon and niobium on weldabilities of ferritic stainless steel welding wire have been investigated. The results are as follows. (1) At MIG and MAG welding, the weld cracking proof characteristic was improved by the addition of 1.0% silicon to weld wire and decreasing the niobium content of weld wire to 0.2%. (2) The developed weld wire with copper coating is excellent in the flatness of weld bead and the corrosion resistance.

著者

服部 和史 野末 晃志 山川 正克 石澤 隆 藤原 正尚 吉田 広明 五十川 幸宏

出版者

大同特殊鋼株式会社

雑誌

電気製鋼 (ISSN:00118389)

巻号頁・発行日

vol.76, no.2, pp.135-140, 2005

被引用文献数

1

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SUS630 is a martensitic precipitation hardened stainless steel having high strength and the good corrosion resistance comparable with SUS304, and used as stern shaft, high strength bolts, and the golf club faces, etc. In golf club faces, thickness of face steel had been 2.3 mm or more to secure durability. To obtain better "Carry" and "Impact feeling" by nonconventional high restitution face, thickness of the face was expected to be possible by thinning by 2.0 mm or less. However, to thin the thickness of the face, a strong material was necessary to secure durability, and application of ausforming process for SUS630 was proposed. Through ausforming process for SUS630 in forging test, tensile strength was closed to 1500 MPa because of the effect of ausforming. To mass-produce the ausformed SUS630, hot rolling process through ausforming was selected from the point of view in production cost, production variation, and constraint on machine. Ausforming process in finish rolling with application of 80 % high reduction in rough rolling with a view of strengthening and more toughness by refining austenitic grain size, named as Combined Ausforming Process (C-AF), was specified on hot rolling process, and hardness has achieved from 480HV to 510HV after aging treatment. Strengthening of SUS630 with C-AF rolling process made it possible to be adopted as golf club face material with high restitution by thinning thickness by 2.0 mm or less.

著者

倉田 征児 植田 茂紀 野田 俊治 山本 隆一 角屋 好邦 中野 隆 田中 良典 馬越 龍太郎

出版者

大同特殊鋼株式会社

雑誌

電気製鋼 (ISSN:00118389)

巻号頁・発行日

vol.79, no.3, pp.239-244, 2008-08-25 (Released:2008-12-26)

参考文献数

7

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Advanced 700 ℃ class steam turbines require using Ni-based superalloys instead of conventional ferritic 12Cr steel which is insufficient in creep strength and oxidation resistance above 650 ℃. The superalloys, however, possess quite higher coefficient of thermal expansion (CTE) than the 12Cr steel. So far authors examined the influence of alloying elements on CTE and the high temperature strength of the Ni-based superalloys. Consequently “LTES700R” was developed for steam turbine, which has low CTE and sufficient creep strength. LTES700R is corrected Mo amount to inhibit the Laves phase and added W to reduce CTE instead of Mo within the range that alfa-tungsten does not precipitate. In addition, Al and Ti, which form gamma-prime, were increased to make up for deteriorating of the strength by Laves phase free. The creep rapture strength of LTES700R manufactured by laboratory forging is higher than that of advanced 12Cr steel owing to be strengthened by gamma-prime [Ni3(Al, Ti)] phase precipitates. The CTE of LTES700R is lower than that of Refractaloy 26®, and slightly higher than that of 12Cr steel. The phase of LTES700R is stable until 5000 hr heating from 550 ℃ to 750 ℃.

著者

篠塚 淳

出版者

大同特殊鋼株式会社

雑誌

電気製鋼 (ISSN:00118389)

巻号頁・発行日

vol.78, no.3, pp.233-240, 2007-07-26 (Released:2008-01-26)

参考文献数

26

被引用文献数

1 1

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Recent remarkable advancement of computer performances made possible a metal cutting simulation with finite element analysis. Nowadays, commercial 3D-FEA software specialized in machining processes, such as turning, milling and drilling, is available. This review focuses on a predictability of FEM cutting simulations. Detailed material properties, such as flow stress under high stain rates and high temperatures conditions, friction at tool-chip contact region, thermal conductivity and heat capacity, are indispensable to simulate a metal cutting process in detail. Flow stress characteristics proposed so far, a nonlinear friction property at the tool-chip contact region and equations to estimate tool wear and tool breakage are presented. A prediction of chip controllability with a FEA is shown. Next, a dynamic thermo elasto-plastic FEM cutting simulation is shown. Deformations and temperatures were solved explicitly in the FEA. A penalty force and a correction heat flux that can be adapted to a wide range of cutting condition were considered at the tool-chip contact region in the FEA. Finally, some results of the FEA under ultra high-speed cutting conditions that cutting speed exceeds the plastic wave speeds of a workpiece material are shown as one of examples indicating high predictability of the FEA.