錬鐵の衝撃抗力に就て

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概要

• 論文の詳細を見る

• In the proof tests of chain cables and crane chains in several leading countries, it is required that the chain should stand a load which is nearly 72% of the breaking strength. Wrought iron may, however, become brittle after it was strained by a stress beyond a certain limit and if this embrittling occur by the proof test, the chain will be used in a brittle condition after the test, which must, therefore, be revised. Izod tests were made on test-pieces taken from three samples of wrought iron, which were strained to various degrees by a tensile testing machine to know the limit and the extent of embrittling by the strain. The same tests were made on test pieces of a low carbon cast steel, as cast steel is often employed for chain cables recently. The results of tests were as follows : -(1) The Izod value of wrought iron is reduced after it was strained by a tensile stress over 60% of the breaking strength. (2) The degree of embrittling is variable according to the material, some samples become only slightly brittle and the others lose nearly 2/3 of their impact value after they were loaded about 72% of the breaking stress. (3) In some cases the impact value of strained samples is greatly reduced at low temperatures while non-strained material remains the same. (4) Low carbon cast steel becomes brittle by strain when stressed in the annealed state, but it does not when it was hardened and tempered. It may thus be concluded that either the proof test for chains specifying excess load should be reasonably altered or the chains must be properly heat-treated so that the impact value will not be reduced by the strain of the proof test

• 社団法人日本鉄鋼協会の論文
• 1928-03-25

著者

• 吉川 晴十

  製鋼部會

関連論文

• 日本鐵鋼協會研究部會・製鋼部會報告 (I)
• 日本鐵鋼協會 鹽基性平爐製鋼研究部會中間報告
• 特殊鋼の熱處理に就て
• 錬鐵の衝撃抗力に就て
• 25) 錬鐵の衝撃抗力に就て(日本鐵鋼協會第三囘講演大會)
• 鋼の性質に及ぼす水鉛の影響
• 鋼の燒戻脆性(テムパーブリツトルネス)に就て
• ニツケル・クローム鋼に關する研究(承前)
• ニツケル・クローム鋼に關する研究

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