14MnV与14MnVTi抗酸管线管组织性能对比分析

Comparative Analysis of Microstructures and Properties of 14MnV and 14MnVTi Acid-resistant Linepipes

分析14MnV钢与14MnVTi钢生产的X52NS抗酸管线管热轧态和正火态的组织性能。结果表明:在热轧状态下,含Ti元素的14MnVTi钢管晶粒度更细小,说明Ti起到了细化晶粒的作用,且屈服强度略高于不含Ti的14MnV;经过正火处理,不含Ti的14MnV钢管晶粒度更细小,且拉伸强度和冲击功值均高于含Ti钢管;由于Ti和N的亲和力较V更强,钢中的N优先与Ti结合,没有多余的N与V结合,影响了V(C、N)复合沉淀强化效果。因此对于X52NS抗酸管线管,14MnV钢的综合力学性能优于14MnVTi钢。

Analyzed here in the essay are the micro-structural properties of the as-hot-rolled and as-normalized X52NS acid-resistant linepipes as made of 14MnV and 14MnVTi steels.As a result,it is revealed that in the as-hot-rolled state,the 14MnVTi steel pipe containing Element Ti has finer grain size,which means that Ti plays a role in refining the grain,and that the yield strength slightly higher than that of the non-Ti 14MnV pipe;after the normalization treatment,the non-Ti 14MnV pipe has much finer grain size,and both of its tensile strength and impact energy value are higher than those of the Ti-containing steel pipe;due to the affinity of Ti and V are stronger than that of V,N in the steel first binds with Ti,and thus no more N remained to bind with V,which influences the composite precipitation strengthening effect.Therefore as for the X52NS acid-resistant linepipe,the overall mechanical properties of the 14MnV steel are better than those of the 14MnVTi steel.