Development Of E410NiMoT1-4Flux-cored Wire For Structure Welding

Hydropower is clean energy, which is renewable, non-polluting, low operatingcost and easy to adjust power peaking. Using hydropower can help to improveresource utilization and overall efficiency of the economy and society. Hydropower isone of the main development directions of China’s electric power.The turbine is the key power equipment of hydropower station. The martensiticstainless steel is one of the main components of the turbine blade materials. When theblade is assembled and post-maintenance process, many410NiMo series of weldingconsumables are required. Currently, the series of welding consumables arelocalization except flux-cored wire. In this paper, the flux-cored wire E410NiMo,which has good performance and meets the requirements of practical engineer, isdeveloped.The304type austenitic stainless steel, carbon steel,410type martensiticstainless steel and430type ferritic stainless steel are all the choices of the strip.Considering the weld metal chemical composition of E410NiMoT1-4flux-cored wireand the performance of the powder filling rate and rolling strip, the430type ferriticstainless steel was determined as the production steel after many trials. The bestpowder filling ratio is22.5%~23.5%. Through improving drawing compression ratio,other production process parameters and using appropriate lubricating powder, theΦ1.6mm E410NiMoT1-4stainless steel flux cored wire is produced by using existingequipment successfully.The flux-cored wire has excellent all-position welding performance by adjustingthe amount and proportion of rutile, quartz, and other minerals fluoride powder. Theexperiment selects the best steel strip and other material, strongly reducing the C, S, Pand other impurity elements, in order to ensure that the wire has a good crackresistance. Through adjusting the amount of alloy powder and improving the chemicalcomposition of deposited metal wire, the wire has the good mechanical properties.Through a lot of stretching, bending, impact, binding fillet and other test experiments,the experiment results can prove that the wire has good strength, good toughness andcrack resistance and meets the actual project requirements.The tensile test data float small, when the experiment uses different interpasstemperatures and PWHT parameters. The mechanical properties of the wire have goodsuitability for different welding process, and the wire is suitable for site conditions.By comparison tests, the performances of the flux-cored wire are no different with theelectrode, solid wire and imported flux-cored wire. Therefore the flux-cored wiremeets the turbine installation site welding conditions. And the user also has been given good recognition after the actual trial.In short, the research and development of martensitic stainless steel flux-coredwire E410NiMoT1-4are met the expectations and got the expected target.