Practical Data for Metallurgists - Timken

TIME AT HEAT, Hr
100
80
60
40
20
10
8
6
4
2
1
DETERMINING CARBURIZING TIMES
AND TEMPERATURES
1,500 F
11 12 13 14 15
PARAMETER, P
87
1,600 F
1,700 F
1,800 F
1,900 F
TO USE THE CHART
In the upper grid, select a point (time and temperature) for which the case
depth results are known. Go vertically down from that point to the known
case depth and plot the point. Pass a line through this point parallel to the
dashed line shown. Projecting a line vertically upward from any point on
this line into the grid will give the combinations of time and temperature
that will result in the same depth of case. For instance, a vertical line drawn
upward from the dashed line at 100 thousandths indicates that a 0.100 in.
case will be produced by 6 hr. at 1900°F, 11 hr. at 1800°F, or 22 hr. at
1700°F. Shop experience of the Cook Heat Treat Co., Houston, is depicted
by this line and its related points.
Adapted from information provided by Charles F. Lewis, Cook Heat
Treating Co., Div. Lindberg Corp.
400
200
100
80
60
40
20
10
CASE DEPTH, 0.001 in.