摘要
结合制造厂实际制造工艺,试验研究了不同焊后热处理温度、正火温度对Q345R(HIC)对接焊接接头金相组织及力学性能的影响。试验发现,随着焊后热处理温度的升高,焊接接头硬度逐渐降低,热影响区晶粒度减小,690℃时焊接接头抗拉强度明显降低。随着正火温度的提高,焊接接头强度变差,接近强度要求值下限,低温冲击性能均良好。考虑正火+焊后热处理的焊接接头对焊接材料P、S质量分数的苛刻要求,选择匹配的国内焊材为AT-H08MnHIC/SJ613HIC,从试验数据看出,焊接接头-30℃冲击功均在200J左右,满足要求,强度值接近要求值下限。
In combination with the practical manufacturing process of manufacturing plants, research butt weld microstructure and mechanical properties of change at the different post weld heat treatment （PWHT） temperature, normalizing temperature on Q345R （HIC）. Study found that, with the increase of temperature of heat treatment after welding, weld hardness gradually decreased, the grain size reducing in heat affected zone and weld tensile strength decreased obviOUS low izin ly at 690 ℃. As the normalizing temperature increase, weld strength is close to the required er limit of variation value, low temperature impact properties are good; the weld after normalizing＋PWHT due to considering the butt welding material and P, S, the chosen domestic welding materials are the AT-H08MnHIC/SJ613HIC. From the test data, the weld at-30 ℃ impact energy are all about 200 J, which meets the requirements, and the strength value close to the lower limit of required value.
出处
《石油化工设备》
CAS
2014年第6期6-9,共4页
Petro-Chemical Equipment
