Effects Of Elements Nb,V,Ti In Martensite Stainless Steel Deposited Metal

In order to improve the steel rolling productivity and minimise duration delay caused by abrasion, more and more factories in metallurgical industry have already surfaced the roller to increase its service life.Due to its convenience,efficiency and low cost,depositing the roller with hardfacing flux-core wires has been used increasingly widely,accordingly developing a sort of hardfacing flux-core wires with favorable welding performance and better high-temperature abrasion resistance property has been urgent.For the need of surfacing and rebuilding roller,a sort of Fe-Cr-C system martensite stainless steel submerged-arc hardfacing flux-core wire has been developed.And add Nb,V ,Ti as alloying agents to improve hardness and high-temperature abrasion resistance of its deposited metal.Under the condition of welding current range 370A to 420A,welding voltage 31.5V ,welding rate 20.3m/h,excellent welding technology property was obtained and the mechanical property of weld joint can meet the work demand,as well as the performance of high-temperature wear resistence.Microalloy element Nb, V, Ti transferring into martensite stainless steel hardfacing flux-core wire deposited metal can effectively improve its high tempering soft resistance, and keep a not-low hot hardness,and then advance its high-temperature adhesion wear and abrasion wear resistance.Compound carbonitrides of Nb,V,Ti precipitate extensively out of matensite stainless steel deposited metal and distribute homogeneously,moreover the carbonitride particles can serve as wear-resistant framework when worn,which can have a good strengthening effect on the hot hardness and high-temperature wear property. Martensite stainless steel with good fracture toughness can effectively support and mosaic compound carbonitrides of Nb,V,Ti, and then those carbonitride particles can better reflect the role of wear-resistance;otherwise in the external force, it will easily arise fracture around the dislocation of carbonitride particles,break off a larger amount of volume,which should have resulted in an apparent decline in high-temperature wear properties.