6Cr4W3o2VNb(65Nb)钢是一种高韧性的冷作模具钢,其成分接近高速钢(W6Mo5Cr4V2)的基本成分,属于基体钢类型。它具有高速钢的高硬度和高强度,又因无过剩的碳化物,所以比高速钢具有更高的韧性和疲劳强度。钢中加入适量的铌,可以起到细化晶粒的作用,并能提高钢的韧性和改善工艺性能。6Cr4W3Mo2VNb钢可用于制造冷挤压模具和冷镦模具等,模具使用寿命均有明显的提高。
C
|
Si
|
Mn
|
Cr
|
Mo
|
W
|
V
|
Nb
|
P
|
S
|
0.60~
0.70
|
≤0.40
|
≤0.40
|
3.80~
4.40
|
1.80~
2.50
|
2.50~
3.50
|
0.80~
1.20
|
0.20~
0.35
|
≤0.030
|
≤0.030
|
6Cr4W3Mo2VNb(65Nb)的物理性能
临界点
|
Ac1
|
Ar1
|
Ms
|
温度(近似值)/℃
|
810~830
|
740~760
|
220
|
6Cr4W3Mo2VNb(65Nb)的热加工
项目
|
加热温度/℃
|
开锻温度/℃
|
终锻温度/℃
|
冷却方式
|
钢锭
钢坯
|
1140~1180
1120~1150
|
1100~1150
1080~1120
|
≥900
900~850
|
缓冷(砂或坑冷)
缓冷(砂或坑冷)
|
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