1. The defects in points, namely after the hot working on the longitudinal steel smooth the surface silvery white spots, and the shape is round or oval. The serious influence the elongation of the workpiece, area reduction and impact toughness.
2. Due to improper forgings, appear chicken feet or herringbone cracks in the form of, also can appear slight crack, destroy the continuity of metal. When the workpiece is by the high load, especially when back to early destruction repeated load.
3. Surface defects have surface scarring, to make the work stress concentration and easy to have caused by fatigue fracture. Produce the burr or scratch back to influence the right car processing clamping and efficiency, serious scratch will reduce the strength of steel, and lead to crack.
4. A steady press-down dimension of end concave produce heart, made the car processing turning increase or cause of forgings scrap.




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