引抜鋼管の衝撃強度に及ぼす切欠きならびに焼鈍しの影響

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Following the line of the previous reports, we have investigated the effects of notch sharpness and annealing on the notched tube impact bending strength of small-diametral, cold drawn and seamless steel tubes (the dimensions of the tube : 25 φ×1.5^t, the reduction percentage in the tube drawing :10 and 30%). The results obtained are outlined as follows. (1) With larger reduction percentage in the tube drawing, the notched tube impact bending strength decreases. And its decrease is noticed most clearly in the impact test at low temperature, say at about -100℃. But when the cold drawn tubes are soft-annealed at 700℃, the above effect disappears. (2) When the cold drawn tube is annealed at low temperature, say at 200〜400℃, its hardness increases to some extent and its impact strength does not change. But when it is annealed at above 400℃, its hardness does not decrease, but its impact strength increases gradually. And when it is annealed at above recrystallization-temperature (600 and 700℃), its hardness largely and its impact value increases rapidly. (3) With the reduction of notch radius of impact test-specimen, its impact value decreases. And this effect is more clearly noticed in the impact test at lower temperature. But in the soft-annealed steel tubes, such notch effect is not clearly seen. (4) The impact strength of the cold drawn steel tubes reaches its maximum value near the room temperature, but rapidly decreases at below -100℃, and drops almost to zero in value at -190℃. (5) When the cold drawn tube is annealed at 400〜450℃, its hardness scarcely decreases, and its impact strength increases to some extent. Moreover, this heat treatment removes its internal stress by the cold drawing. Therefore, in order to make the cold drawn steel tubes tough, it is advisable to anneal them at 400〜450℃. (6) In the impact test of cold drawn steel tubes, we recommend the low temperature test at about -100℃, because this test shows the difference in these tubes most clearly.
社団法人日本材料学会の論文
1965-03-15

引抜鋼管の衝撃強度に及ぼす切欠きならびに焼鈍しの影響

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