公开(公告)号：US4020312A

公开(公告)日：1977-04-26

申请号：US634325

申请日：1975-11-21

申请人： Mutsuro Araki ,  Bunshiro Sakai ,  Itaru Watanabe ,  Makoto Yamada ,  Koshiro Tsukada ,  Tomokazu Godai ,  Isao Aida ,  Masatoshi Nakagaki

发明人： Mutsuro Araki ,  Bunshiro Sakai ,  Itaru Watanabe ,  Makoto Yamada ,  Koshiro Tsukada ,  Tomokazu Godai ,  Isao Aida ,  Masatoshi Nakagaki

IPC分类号： B23K9/16 ,  B21C37/08 ,  B23K9/173 ,  B23K9/23 ,  B23K35/30 ,  C22C38/00 ,  C22C38/08 ,  B23K31/06 ,  B23K9/18 ,  B23K35/34

CPC分类号： C22C38/08 ,  B23K35/3053 ,  B23K9/23

摘要： A method of manufacturing a thick, high-strength steel pipe for low temperature service comprising the steps of forming into tubular shape a steel plate having a thickness of over 12 mm and a specific composition, of which the C.sub.eq value is adjusted to less than 0.50, when the Mn content is less than 1.0 % whereas the C.sub.eq value is adjusted to less than 0.45 when the Mn content is over 1.0 % and less than 2.0 %, and nextly of welding said tube form at high speeds and high efficiency by the process of single electrode or multiple electrode large-current gas-shielded arc welding with one pass per electrode on each side of the seam at a specific condition, each electrode preferably consisting of a solid wire essentially containing less than 0.3 % Ti with or without the addition of less than 0.01 % B, and said steel pipe having, in its as-welded condition, mechanical properties such that the yield point of the base metal portion is over 60,000 psi and the weld zone has a maximum hardness of less than Hv10-280 and a Charpy test absorbed energy of over 7 Kg.m at -10.degree. F. Even when the C.sub.eq value of said steel plate is less than 0.65, a thick, high-strength steel pipe for low temperature service having equal mechanical properties to the above mentioned pipe may be manufactured, after welding, by subjecting the welded pipe to a post heat treatment in which the welded pipe is held at a temperature between 500.degree. and 700.degree. C for less than 1 hour.

摘要翻译： 一种制造用于低温服务的厚的高强度钢管的方法，包括以下步骤：将Ceq值调节至小于0.50的厚度大于12mm的钢板和具体组成的管状 当Mn含量小于1.0％时，当Mn含量超过1.0％且小于2.0％时Ceq值调节至小于0.45，接下来通过该方法以高速和高效率焊接所述管形式 的单电极或多电极大电流气体保护电弧焊接，在特定条件下，每个电极在接缝的每一侧上一次通过，每个电极优选由基本上包含小于0.3％的Ti的实线组成，具有或不具有添加 小于0.01％B，并且所述钢管在其焊接条件下具有使得贱金属部分的屈服点超过60,000psi并且焊接区具有最大硬度的机械性能 小于Hv10-280，夏比试验在-10°F时吸收的能量超过7Kg.m。即使所述钢板的Ceq值小于0.65，也可使用厚度高的低温用钢管， 可以通过对焊接管进行后热处理，焊接管在500〜700℃的温度下保持1小时以上，可以制造与上述管相同的机械特性。