埋弧焊烧结焊剂中MnO应用的试验分析

Application of MnO for submerged arc agglomerated flux

通过对烧结焊剂中常用组分MnO的物理化学性质的分析,试制了三种烧结焊剂,并进行了接头组织及力学性能的对比试验。结果表明,烧结焊剂中加入适量的MnO,对提高焊剂的碱度、增加焊剂还原性、净化焊缝、改善脱渣、成形等工艺性能具有很大的作用。与此同时,适量MnO的加入,还可以合理控制焊缝金属中Mn的含量,稳定奥氏体,降低γ→α转变温度,为焊接接头组织中针状铁素体的形成创造良好的环境,并进一步提高了焊缝金属的力学性能。

According to the physical and chemical properties of the common composition of agglomerated flux-MnO,three kinds of agglomerated flux were prepared and the parallel tests on weld microstiuctures and the mechanical property were discussed also.The result shows that the addition of MnO in the agglomerated flux not only incneases the alkalinity of the flux and its reducibility,and purifies the weld,and improves the slag detachability and the formation ability and processing abilities,but also can stabilize the austenite,and reduce the γ→α transformation temperature by controlling the quantity of Mn in the weld metal when MnO is added in,which will make a good environment for the formation of the acicular ferrite and the promotion of the mechanical property of the weld metal.