What are the performance differences between 45# steel and Q235?
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The material of the bearing sleeve is 45# steel. Since this is an urgent order and 45# steel is not available, can Q235 be used instead?
The mechanical properties and workability of 45 steel are superior to those of Q235-A, but in terms of weldability, the latter is better; the former is not suitable for welding. I’m not sure what you mean by bearing sleeve. If it is a hole for installing bearings (bearing seat), Q235-A is suitable. If it is to be used for sliding bearings, gray cast iron or tin bronze can both be used (it must never be the same material as that used for the shaft).
Reply to 2# okman: The bearing sleeve is the component between the shaft and the bearing