几种丝锥用高速钢的性能比较

Property comparison of several high speed steels used for taps

对M3、M2和M35钢的淬回火硬度、红硬性、抗弯强度以及相应材料丝锥的切削性能进行了对比试验。结果表明，M3钢和M35钢的淬回火硬度和红硬性显著高于M2钢，M3钢和M35钢的淬回火硬度和红硬性无明显差异；M2钢抗弯强度高于M3钢和M35钢。在1160～1180℃淬火，M3钢和M35钢抗弯强度差异很小，在1180～1240℃淬火，M3钢抗弯强度小于M35钢；在1220℃以上淬火，3种材料的抗弯强度都急剧下降。用于丝锥，M2钢和M35钢淬火温度范围比M3钢宽；M3钢丝锥切削性能高于M2钢和M35钢；随着M3钢韧性和可磨削性能的提高，M3钢有望成为新的丝锥专用高速钢。

Contrast tests of the hardness, hot hardness, bending strength and cutting performance of taps quenched and tempered with corresponding materials of M3, M2 and M35 steels were carried out. The results show that the hardness and hot hardness of M3 and M35 steels quenched and tempered are significantly higher than that of the M2 steel, while there is no obvious difference between the M3 and M35 steels. The bending strength of M2 steel is higher than that of the M3 and M35 steels. When quenched at 1160 - 1180 ℃, there is of little difference between the bending strength of M3 and M35 steels; when quenched at 1180-1240 ℃, the bending strength of M3 steel is lower than that of M35 steel; however when quenched above 1220 ℃, all bending strength of these three steels falls sharply. The quenching temperature range of M2 and M35 steels used for tap is wider than that of M3 steel. The cutting performance of M3 steel tap is best. M3 steel is more suitable to the taps with improving toughness and grinding performance.