During the construction of 5Ni steel for type B tank of 99000m3 Very Large Ethane Carrier, When using the original electrodes, the 5Ni steel plate need to be preheated before welding, and resulted the lower productivity. In this paper, the chemical composition, mechanical properties, FISCO crack resistance and welding procedure of OK92.55 and NI-C70S alternative electrodes are tested. The chemical composition, mechanical properties of OK92.55 and NI-C70S electrodes meet the requirements and both of OK92.55 and NI-C70S electrodes have good crack resistance. When the welding parameters are within a reasonable range, both of OK92.55 and NI-C70S electrodes can meet the performance requirements of steel plate welded joints without preheating the steel, OK92.55 and NI-C70S electrodes can be used for ship construction.