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川崎製鉄技報
KAWASAKI STEEL GIHO
Vol.13 (1981) No.1
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第2中径電縫ハイテストラインパイプの製造について
Manufacturing of New 26-inch ERW High-Test Line Pipe

寺田 利坦(Toshihiro Terada) 平野  豊(Yutaka Hirano)  大谷 輝夫(Teruo Otani) 吉本 勇三(Yuzo Yoshimoto) 横山 栄一(Eiichi Yokoyama)
要旨 :
第2中径電縫鋼管工場は最大外径26in(660.4mm),最大肉厚0.63in(16.0mm)の製品が製造できる世界最大のミルである。この新ミル稼動以来,種々実験した結果,(1) AI-Siキルド連鋳材で,靭性にすぐれかつ溶接欠陥発生の少ない素材製造が可能になった。(2) 靭性のすぐれた高張力大径薄肉ERW鋼管や溶接部の品質バラツキの少ない高張力厚肉電縫鋼管の製造が可能になった。(3) このミルで製造したラインパイプの補助的強度特性(バウシンガー効果,内圧降伏破壊強度,低温引張温度など)が定期的に把握できた。
Synopsis :
A new cage forming type ERW mill installed at Chita Works, Kawasaki Steel Corporation, is one of the largest of its kind in the world, capable of producing high quality steel pipe up to 26" (660.4mm) in outside diameter and 0.63" (160.0mm) in wall thickness. Factors contributing to the improvement in quality of the new mill pipe have been examined and the following results obtained. (1) The application of vertical-bendig type caster with improved shielding is effective in decreasing the weld defects. (2) Controlled rolling of hot strip mill and pipe-making technique by cage forming have made it possible to produce high quality steel pipe with large outside diameter and thin wall thickness. (3) Welding heat input control, full automatic seam annealing control and full body ultrasonic testing have contributed to the production of ERW pipe with higher quality and reliability. (4) Supplementary mechanical properties such as yield strength drop due to Bauschinger effect, yield and burst strength by internal pressure, and tensile strength at lower temperatures have been quantitatively determined.
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