(1)牌號和化學(xué)成分見表2-50。
表2-50抗磨白口鑄鐵的牌號和化學(xué)成分
牌 號① |
化學(xué)成分(質(zhì)量分?jǐn)?shù))(%) | |||||||||
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牌號中“DT”和“GT分別表示“低碳”和“高碳”,以區(qū)別該牌號含碳量的高低。
(2)硬度見表2—51。
表2-5l抗磨白口鑄鐵的硬度
牌 號 |
洛氏硬度HRC |
牌 號 |
洛氏硬度HRc | ||||
鑄態(tài) |
淬火態(tài) |
軟化退火態(tài) |
鑄態(tài) |
淬火態(tài) |
軟化退火態(tài) | ||
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淬火加回火狀態(tài)。
(3)用途見表2—52。
表2—52抗磨白口鑄鐵的金相組織和使用特性
牌 號 |
金相組織 |
使用特性 | |
鑄 態(tài) |
淬火態(tài) | ||
KmTBMnSW3 |
共晶碳化物(Fe、Mn、W)3C+馬氏體+殘余奧氏體 |
--- |
適于較小沖擊載荷的磨料磨損 |
KmTBWSCr4 |
共晶碳化物(Fe、w、Cr)3C+馬氏體+殘余奧氏體 |
--- | |
KmTBNi4Cr2-DT |
回火態(tài)
共晶碳化物(Fe、Cr)3C+馬氏體+貝氏體+殘余奧氏體 |
--- |
適于中等沖擊載荷的磨料磨損 |
KmTBNi4Cr2-GT |
適于較小沖擊載荷的磨料磨損 | ||
KmTBCr9Ni5Si2 |
共晶碳化物[(Cr、Fe)7C3+(n、Cr)3C]+馬氏體+殘余奧氏體 |
共晶碳化物[(Cr、Fe) 7C3+(Fe、Cr)3C]+二次碳化物+馬氏體+殘余奧氏體 |
有很好淬透性,適于較大沖擊載荷的磨料磨損 |
KmTBCr2MolCul |
共晶碳化物(Fe、Cr)3C+索氏體+馬氏體 |
共晶碳化物(Fe、Cr)3C+二次碳化物+馬氏體+殘余奧氏體 |
適于較小沖擊載荷的磨料磨損 |
KmTBCrl5M02-DT |
共晶碳化物(Cr、Fe)7C3+奧氏體及其轉(zhuǎn)變產(chǎn)物 |
共晶碳化物(Cr、Fe) 7C3+二次碳化物+馬氏體+殘余奧氏體 |
適于較小沖擊載荷的磨料磨損 |
KmTBCrlSM02-GT |
適于中等沖擊載荷的磨料磨損 | ||
KmTBCr20MO2Cul |
共晶碳化物(Cr、Fe) 7C3+奧氏體及其轉(zhuǎn)變產(chǎn)物 |
共晶碳化物(cr、Fe) 7C3+二次碳化物+馬氏體+殘余奧氏
|
有很好淬透性,適于較大沖擊載荷的磨料磨損 |
KmTBCr26 |
共晶碳化物(cr、Fe) 7C3+奧氏體
|
有良好抗蝕性和抗高溫氧化性,適于較大沖擊載荷的磨料磨損 |