A new coldworking die steel was developed through adjusting allowing components and heattreatment process to improve the conventional steel AISI D2 of which a lot of carbides in ledeburite offer very high wearability in combination with low impact toughness which is easy to lead D2 to break up in use and hard of forging and linear cutting.

The results showed that in the adjacent-weld zone of the 40 mm HSS, overheated structure and a small amount of ledeburite were found.

Granular procedure of eutectic carbide in modified ledeburite steel is studied and granular mechanism of eutectic carbide is discussed.

Dynamical procedure of eutectic carbides granulation during heat treatment could be accelerated by addition of modifier containing trace elements into the ledeburite steel The eutectic carbide net was broken down at 1100℃ and could be turned into granular carbies distri buted uniformly at (1120～1130)

Evolution of Pro-eutectic Austenite in Semi-solid Hypoeutectic High Cr Cast Iron during Remelting;