管线钢用MgO-CaF2-Al2O3-SiO2渣系烧结焊剂
Agglomerated Flux with MgO-CaF2-Al2O3-SiO2 Slag System Used for Pipeline Steels
-
摘要: 研究了适用于X60、X65级管线钢埋弧焊烧结焊剂,其组成为MgO-CaF2-Al2O3-SiO2,研究了各成分对焊接工艺性能和熔敷金属中扩散氢含量的影响规律及熔敷金属的力学性能与组织.结果表明：其碱度BⅡW为2.3,组分为17%～23% Al2O3,16%～24% CaF2,31%～43% MgO,9%～16% SiO2,5%～13% CaCO3,0%～9% MnO,1% TiO2,其余为5%时,脱渣性良好,焊缝成形美观,熔敷金属中扩散氢含量为2.59mL/100g,达到低氢水平；与合适的焊丝配合,其力学性能以及-20℃低温冲击韧度均满足X60、X65管线钢的焊接要求.Abstract: A new type of agglomerated flux for submerged arc welding for X60,X65 grade pipeline steels was prepared.The slag system was MgO-CaF2-Al2O3-SiO2.The influences of different factors on technical properties and diffused hydrogen content,the mechanical properties and microstructure were studied when the basicity was 23,the composition was Al2O3 17%-23%,CaF2 16%-24%,MgO 31%-43%,SiO2 9%-16%,CaCO3 5%-13%,MnO 0%-9%,TiO2 1% and others 5%,the flux showed good removability of slag and favorable welding formation.The diffused hydrogen content was 2.59mL/100g,which reached the level of low hydrogen.This flux matched with a suitable welding wire could meet the need of mechanical properites and low temperature charpy toughness at -20℃ for the welding need of X60 and X65 grade pipeline steels.
下载: