Hot extrusion is the earliest use of extrusion forming technology among several extrusion processes. Since A213T91 has good plastic characteristics, it can be forged into different shapes in forging temperature. So far, the hot extrusion is mainly used in the manufacturing of normal section of A213T91 long pieces, A213T91 profiles, A213T91 pipes, A213T91 bar and various A213T91 machine parts, etc.
Since A213T91 blank must be heated to a temperature to be hot forged , the severe heating may lead to defects such as oxidation and decarburization.Those defects may affect the precision of the extrusion size and surface roughness. To avoid that, after hot extrusion forming of A213T91 machine parts, we will use cutting and other mechanical processing to improve the dimensional precision and surface quality of parts.
Hot extrusion forming can not only used in steel material with good plastic(like non-ferrous metals and their alloys of strength is relatively low, low, medium carbon steel), but also used in forming high strength high carbon, high alloy steel (such as special structure steel, stainless steel, high-speed tool steel and heat resistant steel, etc.)
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