Continuous casting bearing steel round steel and method for producing the same

Abstract

The invention relates to a continuous casting bearing steel round steel with small compression ratio and high cleanliness, the chemical components according to weight percentage are: 0.90 to 1.10 percent of C, 0.20 to 0.50 percent of Mn, 0.15 to 0.50 percent of Si, 1.30 to 1.60 percent of Cr, being equal to or less than 0.0007 percent of oxygen, being equal to or less than 0.008 percent of phosphorus, being equal to or less than 0.005 percent of sulfur, being equal to or less than 0.0025 percent of titanium, being equal to or less than 0.25 percent of copper, being equal to or less than 0.10 percent of nickel, and the rest of Fe and inevitable impurities. The manufacturing method of the continuous casting bearing steel round steel with small compression ratio and high cleanliness comprises the following steps: the selection of liquid steel for steel-making, ladle pouring, pouring box continuous casting bearing steel square billet, heating continuous casting bearing steel square billet in a heating furnace, and rolling the continuous casting bearing steel round steel with the specification Phi from 20 to 75mm(compression ratio can reach the minimum 10.96) in a rolling mill. The nonuniformity of the eliquation carbide and the ribbon carbide of the obtained continuous casting bearing steel round steel reaches China national standards and meets the requirements of bearing manufacturer.

Description

technical field [0001] The invention relates to the manufacturing technology of alloy steel in the metallurgical industry, in particular to continuous casting round steel for bearings and a manufacturing method thereof. Background technique [0002] High carbon chromium bearing steel is a hypereutectoid steel containing chromium. [0003] The production process of traditional high-carbon chromium bearing steel is: primary molten steel smelting in converter or electric furnace → refining molten steel by refining equipment outside the furnace (including LF, VD, RH, etc.) → pouring steel ingots from molten steel → heating ingots and preliminary rolling Billet → billet heating and rolling finished products. [0004] Due to the congenital defect of low billet yield of high-carbon chromium bearing steel molten steel casting ingots, people have developed a method of direct casting of molten steel into billets, that is, a continuous casting method, which increases the yield of molt...

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Problems solved by technology

[0014] From the above, the existing compression ratio control and heating related technologies of continuous casting high-carbon chromium bearing steel cannot solve the problems caused by the compression ratio of 10.96-14.99

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