Research On Drawing And Mechanism Of Core Material Filled Tube

Along with the rapid industrial development,economic development and resources increasingly acute contradictions.It's very imminent to get rid of the traditional development model and go to a new industrial road with high technology,low resources consumption and little environmental pollution.In the steel industry,the consumption of energy is very high and a large number of blast furnace slag is directly emitted into the environment.The potential value of blast furnace slag has not been developed.The government has proposed and committed to develop a new generation of recycled steel manufacturing process and advanced rolling technology or process,aiming at achieving lightweight,reduction and energy saving.And then,it can ease the contradiction between economic development and resources.Core material filled tube(CMFT)is produced using solid wastes produced in iron and steel industry as core material.After cold drawing and annealing treatment,it can substitute the road separation fence and construction scaffolding structures.CMFT can enhance the utilization rate of steel slag,increase enterprise economic efficiency and reduce environmental pollution.We choose A3 LSAW steel tube as outer tube and water quenching slag(WQS)as core materials.By studying the influencing factors of drawing force,we have designed the drawing mold for different drawing sizes,improved CMFT drawing process,and produced the CMFT with good quality.Through the subsequent annealing treatment,the core material's bonding degree is very well.Through experiments and theoretical derivation,we have explored the material density of CMFT during drawing and subsequent annealing process of sintering mechanism.By the experiments of drawing process,we have drawn the conclusion of the relationship between the relative density and wall thickness of each CMFT during drawing.After experiments,according to the principle of conservation of mass and steel tube volume invariably,and measuring the wall thickness,we prove that CMFT has obvious material saving and economic benefit.After the flattening and three point bending experiments,core material plays a vital role in improving outer tube's mechanical behavior.CMFT production can satisfy the energy conservation,emissions reduction and practical application,and it solves the application problems of water slag waste.CMFT has obvious market and application prospect.By metallography,scanning and elemental analysis,we explore the water slag treatment of reaction sintering mechanism after drawing and annealing.We find that the previous non-crystalline phase change to become akermanite and gehlenite based on CaO·Al2O3·SiO2 and CaO·MgO·2SiO2,which leads to the mushrooming of water quenching slag's anchoring strength.What's more,with the increase of drawing passes,the density degree of core material become much higher after annealing.There is a good metallurgical bonded interface zone between water quenching slag and outer tube.New interface bonding with rich alloy elements is formed at the interface.