The influence of raw material on the quality of forgings

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Raw materials of good quality is the guarantee of forgings quality prerequisites, such as raw material defects, will affect forging forming process and the final quality of forgings. Such as the raw materials of chemical elements beyond the prescribed scope or impurity element content is too high, the forging forming and quality will bring great influence, such as: S, B, Cu, Sn elements such as easy to form low melting point phase, make forgings easy to turn up the heat brittle. In order to obtain essence fine grain steel, steel of residual aluminum content should be controlled in a certain range, such as Al acid 0.02% ~ 0.04% (mass fraction). Content too little, do not rise to control grain growth effect, often easy to make the essence of forgings grain size unqualified; Aluminized quantity is overmuch, pressure processing in fibrous tissue formation under the condition of easy formation grain fracture, tear mark fracture, etc. Be like again, in 1 cr18ni9ti austenitic stainless steel, Ti, Si, Al, Mo content is more, ferrite phase, the more easily when forging the ribbon crack, and make a magnetic parts. Such as raw materials exist inside taper pipe residual, subcutaneous foaming, serious carbide segregation, thick non-metallic (s lag), and other defects, forging cracks easily make forgings. In the raw materials of dendritic crystal, serious loose, non-metallic inclusion, flakes, oxidation film, segregation belt and exotic metal mixed defects such as people, easy cause forging performance decline. Raw material surface crack, folding, scarring, coarse crystal ring, and so easy cause forging surface crack.ceramic ball bearing