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 9crwmn模具钢

9crwmn模具钢介绍
  国产模具钢:9CrWMn   标准:GB/T 1299-1985   ●特性及适用范围:   冷作模具钢,性能、用途和 CrWMn接近。
化学成分
  ●化学成份:   碳 C :0.85~0.95   硅 Si:≤0.40   锰 Mn:0.90~1.20   硫 S :≤0.030   磷 P :≤0.030  铬 Cr:0.50~0.80   镍 Ni:允许残余含量≤0.25   铜 Cu:允许残余含量≤0.30   钨 W :0.50~0.80
力学性能:
  硬度 :退火,241~197HB,压痕直径3.9~4.3mm;淬火,≥62HRC  热处理规范及金相组织:   热处理规范:淬火,800~830℃油冷。   交货状态:钢材以退火状态交货。
锻造工艺
  锻造:   油淬冷作模具钢有一些裂纹敏感性,锻造加热时不宜迅速加热,最好在650-750度进行一次预热,锻造加热温度为1130-1150度,终锻温度应大于800-850度,钢锭锻造时取上限温度。坯料锻造时取下限温度 

退火工艺
  退火:一般退火采用780-800度,保温4-6小时,以≤50度/小时,冷却到550度出炉空冷,等温退火采用700-800度保温2-4小时,然后再670-720度保温,保持2-4小时,以≤50度/小时冷速冷却到500度出炉空冷,退火硬度为241-197HB
物理性能
  9CrWMn钢临界温度示于表2-12-1。 9CrWMn钢临界温度   临界点 Ac1 Acm Arl Ms
温度(近似值)/℃ 750 900 700 205

特性
  9CrWMn模具钢材为低合金冷作模具钢.。该钢具有一定的淬透性和耐磨性,淬火变形较小,碳化物分布均匀颗粒细小。   9CrWMn模具钢材通常用于制造截面不大而形状较复杂的冷冲模以及各种量规量具等。

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