Method for increasing creep rate of compacted graphite cast iron by electromagnetic field

Abstract

The invention refers to a manufacturing method for vermicular cast iron, especially the method for upgrading the vermicular rate with pulse electricity-magnetism field. Adds vermicular agent and inoculant into the liquid iron, carries on vermicular process under 1420í½1450íÒC, pours the processed liquid iron into the experimental model. The key is carrying on a interruption commutation traveling wave field on the model, the power frequency is 50Hz, the magnetic induction intensity is 0.01í½0.03T, and gets the vermicular cast iron with the vermicular rate of 75%. The magnesium residual quantity is 0.01í½0.05%, the rare earth residual quantity is 0.01í½0.03%.

Description

Technical field [0001] The invention belongs to a production method of vermicular graphite cast iron, in particular to a production method of improving the vermicular rate and creep stability of vermicular graphite cast iron by using an electromagnetic field. Background technique [0002] The good mechanical properties, thermal stability and good casting performance of compacted graphite cast iron have attracted widespread attention, and have been widely used in the manufacture of automobile engine blocks, cylinder heads, exhaust pipes, brake hubs, steel ingot molds and glass molds. [0003] At present, the key problem in the production of vermicular cast iron is that the vermicular rate is not stable, and the improvement of vermicular rate depends on the formation and stabilization of vermicular graphite in vermicular graphite cast iron. The existing production methods of vermicular graphite cast iron mainly contain three kinds: (1) process molten iron with a small amount o...

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problems of low creep rate and unstable creep in existing production methods, using a pulsed electromagnetic field to increase the creep rate, and to relax the residual amount of magnesium and rare earth in vermicular graphite cast iron range, improve the stability of production, and the creep rate of the final product can reach more than 75%.

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