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（1 中冶建筑研究總院有限公司， 北京 100088； 2 中冶東方工程技術(shù)有限公司， 包頭 014010）

［摘要］

冷成型焊接圓鋼管的徑厚比過(guò)小會(huì)使鋼管材料產(chǎn)生較強(qiáng)的冷作硬化效應(yīng)，強(qiáng)度提高而延性、韌性與焊接性能下降。結(jié)合鋼管標(biāo)準(zhǔn)的制定，對(duì)鋼管徑厚比的合理限值及徑厚比與鋼材伸長(zhǎng)率的相關(guān)關(guān)系進(jìn)行了研究與探討，分析認(rèn)為設(shè)定鋼管中保有延伸率來(lái)確定其徑厚比限值是較合理的方法。同時(shí)，對(duì)徑厚比驗(yàn)證性試驗(yàn)數(shù)據(jù)進(jìn)行的研究和分析表明，當(dāng)冷成型圓管(Q345)的徑厚比為15時(shí)，鋼管材料強(qiáng)度提高而延性、韌性與焊接性能均有較大幅度下降。

［關(guān)鍵詞］冷成型； 徑厚比； 冷作硬化效應(yīng)； 冷彎伸長(zhǎng)率

中圖分類(lèi)號(hào)：TU391    文獻(xiàn)標(biāo)識(shí)碼：A   文章編號(hào)：1002-848X(2015)03-0044-04

Discussion on limited value of diameterthickness ratio for coldformed

welded circular steel tube

Chai Chang1， Liu Yingchun2

 (1 China Steel Construction Society， Beijing 100088, China；

2 BERIS Engineering and Research Corporation, Baotou 014010, China)

Abstract:

Coldformed welded circular steel tube with too small diameterthickness ratio, which has strong coldhardening effect on the steel tube material, has improved strength and degraded ductility, toughness and welding performance. Combined with the formulation of a piece of steel pipe standard, relationships between reasonable limited value and diameterthickness ratio of the tube and steel elongation were studied and discussed. It was pointed out that to reserve the necessary percentage elongation may be a reasonable method for limited value of the diameterthickness ratio. Meanwhile, the study and analysis of examined test data on diameterthickness ratio show that when the diameterthickness ratio of Q345 coldformed circular steel tube equals 15, the strength of the steel tube material increases but ductility, toughness and weld ability decrease with a large range.

Keywords:coldformed； diameterthickness ratio； coldhardening effect； coldbending elongation

作者簡(jiǎn)介：柴昶，教授級(jí)高級(jí)工程師，Email:chai0204@126.com。