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AISI 8620/86L20<br />
Carefully controlled proportions of chromium, nickel and molybdenum are respon sible<br />
for the extensive use of 8620 as a carburizing alloy steel. Valuable features of this<br />
grade include extreme surface hardenability and internal strength.<br />
TYPICAL ANALYSIS AISI 8620/86L20<br />
Carbon (C) .18/.23<br />
Manganese (Mn) .70/.90<br />
Silicon (Si) .15/.30<br />
Nickel (Ni) .40/.70<br />
Molybdenum (Mo) .15/.25<br />
Chromium (Cr) .40/.60<br />
Phosphorus (P)<br />
.035 MAX<br />
Sulphur (S)<br />
.040 MAX<br />
*Lead .15/.35<br />
HEAT TREATMENT<br />
Carburize temperature<br />
1700ºF (927ºC)<br />
(Allow to cool in carburizing box)<br />
Reheat temperature<br />
155OºF (843ºC<br />
Quenching medium<br />
O (I)<br />
TENSILE STRENGTH<br />
92,000 lbs. PSI<br />
YIELD POINT<br />
64,000 lbs. PSI<br />
BRINELL HARDNESS 192<br />
ROCKWELL B 92<br />
ELONGATION IN 2" 25%<br />
REDUCTION IN AREA 58%<br />
MACHINABILITY 58%<br />
*Applies only to 8620 leaded alloy steel bars.<br />
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• Stress Relieving • Normalizing • Annealing<br />
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