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Carefully controlled proportions of chromium, nickel and molybdenum are responsible for the extensive use of 8620 as a carburizing alloy steel. Valuable features of this grade include extreme surface hardenability and internal strength.
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TYPICAL ANALYSIS |
AISI 8620 |
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Carbon (C) |
.18/.23 |
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Manganese (Mn) |
.70/.90 |
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Silicon (Si) |
.15/.30 |
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Nickel (Ni) |
.40/70 |
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Molybdenum (Mn) |
.15/.25 |
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Chromium (Cr) |
.40/.60 |
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Phosphorus (P) |
.035 MAX |
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Sulphur (S) |
.040 MAX |
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HEAT TREATMENT
Carburize temperature
(Allow to cool in carburizing box)
Reheat temperature
Quenching medium |
1700°F(927°C)
1550°F(843°C
0(l) |
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TENSILE STRENGTH |
92,000 lbs. PSI |
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YIELD POINT |
64,000 lbs. PSI |
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BRINELL HARDNESS |
192 |
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ROCKWELL B |
92 |
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ELONGATION IN 2 |
25% |
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REDUCTION IN AREA |
58% |
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MACHINABILITY |
58% |
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