E36钢板成分对埋弧焊接头韧性的影响

针对TMCP工艺生产的3个炉批次E36钢12 mm板，开展了钢板及埋弧焊接头力学性能、系列温度冲击试验，研究了钢中C、Ni、Nb、Ti元素对钢板埋弧焊接头韧性的影响。研究结果表明，降低钢中C含量、添加少量Ni元素有利于提高埋弧焊接头低温韧性，采用Nb、Ti微合金化，有利于细化母材晶粒及抑制焊接热影响区晶粒粗化，而钢中Nb元素对焊缝微观组织及韧性有不利影响，应进行适量控制。 

Influence of E36 Steel Plate Components on the Toughness of Submerged Arc Welding Joint

In order to study the influence of elements C,Ni, Nb and Ti in steel on the toughness of submerged arc welding joint, the mechanical property tests and series of temperature Charpy impact tests were carried out for 3 batches of 12 mm E36 steel plates produced by TMCP process. The results indicated that the low-temperature toughness of the submerged arc welding joint could be improved by reducing the C element and adding the Ni element; Nb and Ti microalloying was helpful to refine the grain of parent material and at the same time to inhibit the grain coarsening of heat-affected zone; However, the Nb element should be controlled properly because of its adverse effect on the toughness of the submerged arc welding joint.