(1)牌号和化学成分见表2-50。
表2-50抗磨白口铸铁的牌号和化学成分
牌 号① |
化学成分(质量分数)(%) | |||||||||
C |
S |
Mn |
Cr |
M0 |
Ni |
Cu |
W |
S |
P | |
KmTBMn5W3 |
3.O~3.5 |
O.8~1.3 |
4.0~6.0 |
--- |
--- |
--- |
--- |
2.5~3.5 |
≤0.10 |
≤0.15 |
KmTBW5Cr4 |
2.5~3.5 |
O.5~1.0 |
O.5~1.0 |
3.5~4.5 |
--- |
--- |
--- |
4.5~5.5 |
≤0.10 |
≤0.15 |
KmTBNi4Cr2-DT |
2.7~3.2 |
0.3~0.8 |
O-3~0.8 |
2.O~3.O |
O~1.O |
3.O~5.0 |
--- |
--- |
≤O.10 |
≤O.15 |
KmTBNi4Cr2-GT |
3.2~3.6 |
0.3~O.8 |
O-3~0.8 |
2.O~3.O |
O~1.0 |
3.0~5.0 |
--- |
--- |
≤0.10 |
≤0.15 |
KmTBCr9Ni5Si2 |
2.5~3.6 |
1.5~2.2 |
0.3~0.8 |
8.O~10.O |
0~1.0 |
4.5~6.5 |
--- |
--- |
≤O.10 |
≤O.15 |
KmTBCr2MolCul |
2.4~3.6 |
≤1.0 |
1.O~2.0 |
2.0~3.0 |
0.5~1.0 |
--- |
0.8~1.2 |
--- |
≤O.10 |
≤0.15 |
KmTBCr15Mo2-DT |
2.O~2.8 |
≤1.0 |
0.5~1.0 |
13.0~18.O |
0.5~2.5 |
O~1.0 |
O~1.2 |
--- |
≤0.06 |
≤0.10 |
KmTBCr15Mo2-GT |
2.8~3.5 |
≤1.0 |
0.5~1.0 |
13.0~18.O |
0.5~3.0 |
O~1.O |
O~1.2 |
--- |
≤0.06 |
≤O.10 |
KmTBCr20Mo2Cul |
2.0~3.0 |
≤1.0 |
0.5~1.0 |
18.O~22.0 |
1.5~2.1 |
0~1.5 |
0.8~1.2 |
--- |
≤O.06 |
≤O.10 |
KmTBCr26 |
2.3~3.0 |
≤1.O |
0.5~1.0 |
23.0~28.0 |
0~1.0 |
O~1.5 |
0~2.0 |
--- |
≤0.06 |
≤O.10 |
①牌号中“DT”和“GT分别表示“低碳”和“高碳”,以区别该牌号含碳量的高低。
(2)硬度见表2—51。
表2-5l抗磨白口铸铁的硬度
牌 号 |
洛氏硬度HRC |
牌 号 |
洛氏硬度HRc | ||||
铸态 |
淬火态 |
软化退火态 |
铸态 |
淬火态 |
软化退火态 | ||
KmTBMn5W3 |
50~60 |
--- |
--- |
KmTBCr2M0lCul |
50~56 |
≥56 |
≤40 |
KmTBW5Cr4 |
50~65 |
--- |
--- |
KmTBCrl5M02一DT |
40~56 |
≥58 |
≤40 |
KmTBNi4r2-TD |
--- |
≥53① |
--- |
KmTBCr l5M02-GT |
50~58 |
≥58 |
≤40 |
KmTBNi4r2-GD |
--- |
≥55① |
--- |
KmTBCr20MoCul |
50~58 |
≥58 |
≤40 |
KmTBCr9Ni5Si2 |
--- |
≥55 |
--- |
KmTBCr26 |
50~58 |
≥55 |
≤40 |
①淬火加回火状态。
(3)用途见表2—52。
表2—52抗磨白口铸铁的金相组织和使用特性
牌 号 |
金相组织 |
使用特性 | |
铸 态 |
淬火态 | ||
KmTBMnSW3 |
共晶碳化物(Fe、Mn、W)3C+马氏体+残余奥氏体 |
--- |
适于较小冲击载荷的磨料磨损 |
KmTBWSCr4 |
共晶碳化物(Fe、w、Cr)3C+马氏体+残余奥氏体 |
--- | |
KmTBNi4Cr2-DT |
回火态
共晶碳化物(Fe、Cr)3C+马氏体+贝氏体+残余奥氏体 |
--- |
适于中等冲击载荷的磨料磨损 |
KmTBNi4Cr2-GT |
适于较小冲击载荷的磨料磨损 | ||
KmTBCr9Ni5Si2 |
共晶碳化物[(Cr、Fe)7C3+(n、Cr)3C]+马氏体+残余奥氏体 |
共晶碳化物[(Cr、Fe) 7C3+(Fe、Cr)3C]+二次碳化物+马氏体+残余奥氏体 |
有很好淬透性,适于较大冲击载荷的磨料磨损 |
KmTBCr2MolCul |
共晶碳化物(Fe、Cr)3C+索氏体+马氏体 |
共晶碳化物(Fe、Cr)3C+二次碳化物+马氏体+残余奥氏体 |
适于较小冲击载荷的磨料磨损 |
KmTBCrl5M02-DT |
共晶碳化物(Cr、Fe)7C3+奥氏体及其转变产物 |
共晶碳化物(Cr、Fe) 7C3+二次碳化物+马氏体+残余奥氏体 |
适于较小冲击载荷的磨料磨损 |
KmTBCrlSM02-GT |
适于中等冲击载荷的磨料磨损 | ||
KmTBCr20MO2Cul |
共晶碳化物(Cr、Fe) 7C3+奥氏体及其转变产物 |
共晶碳化物(cr、Fe) 7C3+二次碳化物+马氏体+残余奥氏
|
有很好淬透性,适于较大冲击载荷的磨料磨损 |
KmTBCr26 |
共晶碳化物(cr、Fe) 7C3+奥氏体
|
有良好抗蚀性和抗高温氧化性,适于较大冲击载荷的磨料磨损 |