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Heat Treating Steel Time vs Temperature and Case Harden Thickness
Engineering Materials
Applications & Design
The following table chart specifies the Heat Treating Time at known Temperature and the resulting Case Harden Depth.
Heat Treat Time Hours |
Temperature, ºF |
||||||||||
1400 |
1450 |
1500 |
1550 |
1600 |
1650 |
1700 |
1750 |
1800 |
1850 |
Case Depth Thickness Inches |
|
1 |
0.008 |
0.010 |
0.012 |
0.015 |
0.018 |
0.021 |
0.025 |
0.029 |
0.034 |
0.040 |
|
2 |
0.011 |
0.014 |
0.017 |
0.021 |
0.025 |
0.030 |
0.035 |
0.041 |
0.048 |
0.056 |
|
3 |
0.014 |
0.017 |
0.021 |
0.025 |
0.031 |
0.037 |
0.043 |
0.051 |
0.059 |
0.069 |
|
4 |
0.016 |
0.020 |
0.024 |
0.029 |
0.035 |
0.042 |
0.050 |
0.059 |
0.069 |
0.079 |
|
5 |
0.018 |
0.022 |
0.027 |
0.033 |
0.040 |
0.047 |
0.056 |
0.066 |
0.077 |
0.089 |
|
6 |
0.019 |
0.024 |
0.030 |
0.036 |
0.043 |
0.052 |
0.061 |
0.072 |
0.084 |
0.097 |
|
7 |
0.021 |
0.026 |
0.032 |
0.039 |
0.047 |
0.056 |
0.066 |
0.078 |
0.091 |
0.105 |
|
8 |
0.022 |
0.028 |
0.034 |
0.041 |
0.050 |
0.060 |
0.071 |
0.083 |
0.097 |
0.112 |
|
9 |
0.024 |
0.029 |
0.036 |
0.044 |
0.053 |
0.063 |
0.075 |
0.088 |
0.103 |
0.119 |
|
10 |
0.025 |
0.031 |
0.038 |
0.046 |
0.056 |
0.067 |
0.079 |
0.093 |
0.108 |
0.126 |
|
11 |
0.026 |
0.033 |
0.040 |
0.048 |
0.059 |
0.070 |
0.083 |
0.097 |
0.113 |
0.132 |
|
12 |
0.027 |
0.034 |
0.042 |
0.051 |
0.061 |
0.073 |
0.087 |
0.102 |
0.119 |
0.138 |
|
13 |
0.028 |
0.035 |
0.043 |
0.053 |
0.064 |
0.076 |
0.090 |
0.106 |
0.123 |
0.143 |
|
14 |
0.029 |
0.037 |
0.045 |
0.055 |
0.066 |
0.079 |
0.094 |
0.110 |
0.128 |
0.149 |
|
15 |
0.031 |
0.039 |
0.047 |
0.057 |
0.068 |
0.082 |
0.097 |
0.114 |
0.133 |
0.154 |
|
16 |
0.032 |
0.039 |
0.048 |
0.059 |
0.071 |
0.084 |
0.100 |
0.117 |
0.137 |
0.159 |
|
17 |
0.033 |
0.040 |
0.050 |
0.060 |
0.073 |
0.087 |
0.103 |
0.121 |
0.141 |
0.164 |
|
18 |
0.033 |
0.042 |
0.051 |
0.062 |
0.075 |
0.090 |
0.106 |
0.125 |
0.145 |
0.169 |
|
19 |
0.034 |
0.043 |
0.053 |
0.064 |
0.077 |
0.092 |
0.109 |
0.128 |
0.149 |
0.173 |
|
20 |
0.035 |
0.044 |
0.054 |
0.066 |
0.079 |
0.094 |
0.112 |
0.131 |
0.153 |
0.178 |
|
21 |
0.036 |
0.045 |
0.055 |
0.067 |
0.081 |
0.097 |
0.114 |
0.134 |
0.157 |
0.182 |
|
22 |
0.037 |
0.046 |
0.056 |
0.069 |
0.083 |
0.099 |
0.117 |
0.138 |
0.161 |
0.186 |
|
23 |
0.038 |
0.047 |
0.058 |
0.070 |
0.085 |
0.101 |
0.120 |
0.141 |
0.164 |
0.190 |
|
24 |
0.039 |
0.048 |
0.059 |
0.072 |
0.086 |
0.103 |
0.122 |
0.144 |
0.168 |
0.195 |
|
25 |
0.039 |
0.049 |
0.060 |
0.073 |
0.088 |
0.106 |
0.125 |
0.147 |
0.171 |
0.199 |
|
26 |
0.040 |
0.050 |
0.061 |
0.075 |
0.090 |
0.108 |
0.127 |
0.150 |
0.175 |
0.203 |
|
27 |
0.041 |
0.051 |
0.063 |
0.076 |
0.092 |
0.110 |
0.130 |
0.153 |
0.178 |
0.206 |
|
28 |
0.042 |
0.052 |
0.064 |
0.078 |
0.094 |
0.112 |
0.132 |
0.155 |
0.181 |
0.210 |
|
29 |
0.042 |
0.053 |
0.065 |
0.079 |
0.095 |
0.114 |
0.134 |
0.158 |
0.185 |
0.214 |
|
30 |
0.043 |
0.054 |
0.066 |
0.080 |
0.097 |
0.116 |
0.137 |
0.161 |
0.188 |
0.217 |
For Example: 4320 carburized at 1700ºF for 11 hours at temperature would attain “case depth” of 0.083 inches. If 0.100 inches were specified it would require 16 hours. Source: Metal Progress, August 1943.
Case Depth vs Time Heat Treating Table Graph
Hardness Vs. Carbon Content of Steel
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