An oil-containing slider used for steel pipe expansion head and its alloy and preparation process

Abstract

The invention provides an oil-containing sliding block for a steel pipe expanding head. The oil-containing sliding block is made of alloy, contains oil and is capable of generating the oil by loading and absorbing the oil by unloading. The alloy of the oil-containing sliding block comprises mutual diffusion elements of Fe, Ti, Al and RE, wherein the mass ratio of the elements of the Fe, the Ti and the Al is that Fe : Ti : Al=4:2.3:1 to 2.3:1.9:1, and the total alloy mass of the RE is 1.20%-2.30%; the alloy exists alone in a powder form of the three elements of Fe, Ti and Al at first, the average grain diameter of powder is 50 mu. m, and the alloy is platy. The oil-containing sliding block for the steel pipe expanding head is prepared through the steps of isostatic forming, sintering, warm keeping and annealing. A traditional oil way system and a traditional sliding block are integrated and replaced by the oil-containing sliding block, i.e., the sliding block which has certain porosity and is capable of generating the oil by loading and absorbing the oil by unloading is prepared through powder metallurgy, and self lubrication on an inner cone body and an outer fan-shaped block of the expanding head is realized.

Description

technical field [0001] The invention belongs to the field of steel pipe processing, and in particular relates to an oil-containing slider used for steel pipe expansion heads, an alloy used therein and a preparation process thereof. Background technique [0002] The steel pipe diameter expansion and full circle process is a necessary process for the production of steel pipes for large diameter pipes (especially straight seam submerged arc welded steel pipes), so as to ensure the geometric roundness of the produced steel pipes. Diameter expansion can eliminate deformation, improve dimensional accuracy, increase the straightness of steel pipes, eliminate residual stress, and increase yield strength. At present, mechanical expansion is mostly used in the production of steel pipes. The mechanical expansion head is mainly composed of a multi-faceted pyramid and corresponding fan-shaped wedges. It is driven by hydraulic pressure and depends on the expansion of the wedge surface to ...

AI Technical Summary

Problems solved by technology

Usually, the internal mechanisms of the expansion head are lubricated by the oil supply through the oil circuit, but the oil supply of the oil circuit has the disadvantages of complex design, easy to be blocked by grinding, insufficient lubrication, etc., which greatly limits the efficiency and quality of the diameter expansion

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