Low-silicon cold rolled precision strip steel for copper-lead bearing steel back and production method thereof

Abstract

The invention discloses low-silicon cold rolled precision strip steel for copper-lead bearing steel back and a production method thereof. The strip steel comprises the following chemical components in percentage by weight: 0.09 to 0.15 percent of C, less than or equal to 0.01 percent of Si, 0.25 to 0.55 percent of Mn, less than or equal to 0.015 percent of P, less than or equal to 0.015 of S, 0.02 to 0.06 percent of Al, and the balance of Fe and inevitable impurities. The production method comprises the steps of molten iron desulfuration, refining in a converter, argon blowing, continuous casting, slab heating, hot continuous rolling, laminar cooling, coiling, acid cleaning, cold rolling, whole hydrogen cover annealing, levelling, finishing and the like. By detecting the comprehensive mechanical property of the strip steel, the strip steel has the advantages of high strength, high hardness, excellent cohesiveness and high surface accuracy; and the method has the advantages of simple production process and low production cost.

Description

technical field [0001] The invention relates to cold-rolled strip steel, in particular to a low-silicon cold-rolled precision strip steel for copper-lead bearing bush steel back and a production method thereof. Background technique [0002] Cold-rolled strip steel is a special steel backing steel used to make copper-lead composite bearing bushes such as crankshaft main bushes and connecting rod bushes of various automobile engines. It supports the bearing bushes and affects the fatigue strength and service life of the bearing bushes. essential material. The production process of bearing bushes of different material types is also different, and the requirements for cold-rolled strip steel are also different. Generally, the production process of copper-lead bearing bush is as follows: shearing of cold-rolled strip steel → roughening of cold-rolled strip steel → cloth copper-lead alloy powder on the rough surface of cold-rolled strip steel → sintering at about 850 °C → rolling...

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Problems solved by technology

However, adding these microalloying elements not only increases the cost of the material, but also brings difficulties to the control of the production process

Moreover, neither of these two patent documents gives a corresponding introduction to the performance parameters of the bimetal bond strength (that is, the bond strength between the steel back of the bearing bush and the alloy) that determines the service life of the bearing bush

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