Method for producing large diameter thick wall gr15 bearing tube with steel ingot

Abstract

The invention discloses a method for producing a large-caliber and thick-wall Cr15 bushed bearing by using a steel ingot. The method for producing the large-caliber and thick-wall Cr15 bushed bearing by using the steel ingot comprises the following steps of adopting a static ingot of which the chemical components are 0.95wt% to 1.05wt% of C, 0.25wt% to 0.45wt% of Mn, 0.15wt% to 0.35wt% of Si, 1.40wt% to 1.65wt% of Cr, not more than 0.020wt% of S, not more than 0.027wt% of P, and the rest of Fe and inevitable impurities and of which the outside diameter is above 300mm, manufacturing the static ingot into a tube blank according to a boring hole of the static ingot, carrying out preheating treatment on the tube blank, manufacturing the tube blank into a pierced billet through cross piercing treatment, manufacturing the pierced billet into a bushed bearing through pilger rolling, and processing the bushed bearing into the large-caliber and thick-wall Cr15 bushed bearing through a processing step. By using the method for producing the large-caliber and thick-wall Cr15 bushed bearing by using the steel ingot, the Cr15 bushed bearing can be manufactured without carrying out blank rolling or blank forging treatment on the steel ingot for the bearing, so as to further lower the difficulty of a production technique of a large-caliber and thick-wall bushed bearing, and to reduce the production cost of the large-caliber and thick-wall bushed bearing.

Description

technical field [0001] The invention relates to the technical field of production of hot-rolled seamless steel pipes, in particular to a method for producing Gr15 bearing pipes with an outer diameter of more than 300mm and a wall thickness of more than 40mm by steel ingots. Background technique [0002] Bearing tubes are seamless steel tubes used to manufacture rolling bearing rings. There are two existing manufacturing methods for bearing tubes. The first method is to process the bearing steel ingot by rolling or forging, and then undergo hot piercing and hot forging; the second method is to punch the bearing steel ingot forging After hole treatment, it is formed by hot rolling. [0003] No matter which of the above methods is adopted, the bearing steel ingot needs to be rolled or forged, which causes the technical problem of high production cost of the bearing tube. It is necessary to produce large-diameter thick-walled bearings with an outer diameter of 300mm or more and...

AI Technical Summary

Problems solved by technology

[0007] To sum up, the existing bearing tube production technologies all adopt the process of rolling or forging the bearing steel ingot. When producing large-diameter thick-walled bearing tubes with an outer diameter of 300 mm or more, larger forging billets are required. , the production process of the bearing tube is difficult and the technical problem of high production cost

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