Cr12、Cr12Mo、Cr12MoV、CrWMn等高碳高铬优质合金工具钢是多数厂家作为冷冲模主要工作零件的首选用料。由于目前国内无法供应二次精炼的工具钢,上述所有牌号的优质合金工具钢也都只供应初炼钢锭的轧材或锻材。按照GB1299—1977《Cr12、Cr12MoV钢材共晶碳化物不均匀度》的国标规定要求,即当钢材截面尺寸>70～120mm时,不大于6级。而根据对国内外大量失效报废冲模的分析研究和长期在冲压现场的实践经 Cr12, Cr12Mo, Cr12MoV, CrWMn and other high-carbon high-chromium alloy tool steel is the majority of manufacturers as the main parts of the work of choice for the first choice of materials. Due to the current domestic can not supply secondary refining of tool steel, all of the above grades of high-quality alloy tool steel are also only available for the first batch of ingot rolling or forging material. In accordance with GB1299-1977 “Cr12, Cr12MoV eutectic carbide unevenness” of the national standard requirements, that is, when the steel cross-sectional size> 70 ~ 120mm, not more than 6. According to a large number of domestic and foreign failure scrap die analysis and long-term practice in the stamping site