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Below is a table with approximate values of heat transfer coefficients for different quenching media and their speeds ( reference: A.S.M. Handbook Vol. 04 - Heat treatment):
Quenching medium |
Quenching medium Temperature |
Quench Velocity |
Grossmann |
heat transfer Coefficient |
|||
|---|---|---|---|---|---|---|---|
°C |
°F |
m/s |
ft/ min |
W/ m2K |
btu/ft2 h°F |
||
Water |
32 |
90 |
0 |
0 |
1.1 |
5000 |
880 |
0.25 |
50 |
2.1 |
9000 |
1600 |
|||
0.51 |
100 |
2.7 |
12000 |
2100 |
|||
0.76 |
150 |
2.8 |
12000 |
2100 |
|||
55 |
130 |
0 |
0 |
0.2 |
1000 |
180 |
|
0.25 |
50 |
0.6 |
2500 |
440 |
|||
0.51 |
100 |
1.5 |
6500 |
1100 |
|||
0.76 |
150 |
2.4 |
10500 |
1850 |
|||
Oil with high |
60 |
140 |
0.00 |
0 |
0.5 |
2000 |
350 |
0.25 |
50 |
1.0 |
4500 |
790 |
|||
0.51 |
100 |
1.1 |
5000 |
880 |
|||
0.76 |
150 |
1.5 |
6500 |
1200 |
|||
25% polyvinyl pyrrolidone |
43 |
110 |
0 |
0 |
0.8 |
3500 |
620 |
0.25 |
50 |
1.3 |
6000 |
1100 |
|||
0.51 |
100 |
1.5 |
6500 |
1200 |
|||
0.76 |
150 |
1.8 |
7500 |
1300 |
|||
Mineral oil |
65 |
150 |
0.51 |
100 |
0.7 |
3000 |
530 |
Martempering oil |
150 |
300 |
0.51 |
100 |
1.2 |
5000 |
880 |
Air |
27 |
80 |
0 |
0 |
0.05 |
200 |
35 |
2.54 |
500 |
0.06 |
250 |
44 |
|||
5.08 |
1000 |
0.08 |
350 |
62 |
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