Raw materials for forging organization and performance

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Forging quality raw materials for casting, rolling and extrusion materials and forging blank. And mill bar, extrusion materials and forging blank respectively is casting by rolling, extrusion and forging processing of semi-finished pr oducts formed. To cast spindle, it burden composition, smelting method and forging process is an important link to determine its quality. And rolling, extrusion and forging process, it is decided to corresponding semi-finished product quality and a link.machine bearing
Raw materials in the forging process before, subject to size, surface quality, chemical composition, high power organization, macroscopic organization and mechanical performance test, conform to the technical conditions for the rear can put into production.
The chemical composition of raw materials, high power organization, macroscopic organization and mechanical properties is to guarantee the performance of forgings organization foundation, and the size of the raw materials and surface quality directly affects forging process plastic and forming. In addition, the raw material malleability and recrystallization characteristic is to det ermine the basis of forging process parameters.bearing manufacturers
Therefore, the raw material quality is to guarantee the quality of forgings prerequisite.
But, the raw material quality inspection has certain limitations (such as: residual and sampling not representative, etc.), the raw material and technical conditions prescribed test methods, not likely to take steel internal all quality problems are exposed, such as: the internal composition and segregation, etc. Therefore, various defects of the raw material existence, certainly will influence the forging forming process and the final quality of forgings.
Raw materials for forging organization and properties of, mainly in the following aspects:
Chemical composition and the influence of impurity element
In raw material and technical conditions, the chemical elements are stipulates corresponding composition range, the impurit y element S, P, Cu, Sn, Pb and so on also to have certain restriction. Chemical element beyond the prescribed scope and impurity element content too high to forging forming and quality will bring great influence.
S, B, Cu, Sn elements such as easy to form low melting point phase, make forgings easy to turn up the heat brittle.miniature bearing
Al containing amount of alloy steel and the essence of the grain degree have certain influence. 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%). Including aluminum quantity too little, do not rise to control the function of grain growth; Aluminized quantity is overmuch, pressure processing in fibrous tissue formation under the condition of easy made grain fracture, tear mark fracture, which will reduce the forging mechanical properties and operational perfo rmance.
In 1 cr18ni9ti austenitic stainless steel, Ti, Si, Al, Mo content is more, ferrite phase, the more the more easily when forging forming surface crack, and magnetic parts.
Raw materials of eutectic relative forging formation and forgings quality are of great influence, it makes the material in the forging heating before easily burnt and reduce the material of plastic index, etc. Such as: ledeburite tool steel of a eutectic carbides, aluminum alloy extrusion bar of the tree branch eutectic compound etc. And the titanium alloy material bulky beta phase directly influence the forging of conventional mechanical properties.bearing company