Manufacturing method of roll collar material of water cold furnace roller

The invention provides a manufacturing method of a roll collar material of a water cold furnace roller, belonging to the technical field of steel rolling. The roll collar material of the water cold furnace roller is manufactured from a CoCr alloy material by adopting a vacuum melting process combined with a vacuum paraffin casting mould process, wherein the CoCr alloy material comprises the following components by weight percent: 0.220% of C, 1.400% of Si, 0.900% of Mn, 28.030% of Cr, 49.360% of Co, 0.050% of Nb, less than or equal to 0.019% of P, less than or equal to 0.06% of S and the balance of Fe. when the CoCr alloy material roll collar and the casting process thereof provided by the invention are used in a roll bottom type soaking pit furnace, the precipitation of carbides is effectively inhibited and delayed, the formation of net-shaped carbides is prevented, the strength and hardness of the roller collar are enhanced, the temperature resisting, and abrasion resisting and creep resisting properties of the roll collar are improved and the roll collar dose not generate steel-adhering and nodulation phenomena when hot blank is transmitted by silicon steel.