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合金工具钢Cr12具有耐磨性高、淬火变形小和淬透性高等特点,所以常用它来制造冷冲压模具、冷切剪刀及量规等。 Cr12的成分:C2.00～2.30％,Cr11.50～13.00％,Si≤0.40％≤0.35％Mn。由于含碳量、铬量高,所以它具有下列特点: 1.导热性差。其导热率仅为0.2～0.25瓦/厘米·度,而一般合金钢则在0.35瓦/厘米·度以上。因此加热和冷却都不宜过快,以免造成截面上温差过大而开裂。 2.碳化物偏析较严重,脆性较大,因此需要较大的锻压力和锻造比,
Cr12 alloy tool steel with high wear resistance, quenching deformation and high hardenability characteristics, it is often used to create cold stamping dies, cold cuts and gauges and other scissors. Composition of Cr12: C2.00 ~ 2.30%, Cr11.50 ~ 13.00%, Si≤0.40% ≤0.35% Mn. Because of the carbon content, high chromium content, so it has the following characteristics: 1. Poor thermal conductivity. Its thermal conductivity is only 0.2-0.25 W / cm., While the average alloy steel is at 0.35 W / cm.degree. Therefore, heating and cooling should not be too fast, so as to avoid cross-sectional temperature difference is too large and cracking. 2. Carbide segregation is more serious, more brittle, so you need a larger forging pressure and forging ratio,