PACIFIC 8620 is a triple alloyed nickel-chrome-moly steel. It has become the standard alloy grade for carburizing because of its balanced case-core hardenability, availability and moderate cost.
PACIFIC 8620H is rough turned oversize in sizes exceeding 3" diameter. These sizes are also calcium treated, vacuum degassed and ultrasonic tested for optimum machinability, cleanliness and soundness.
This grade is often used in the as received condition where moderate strength with good weldability is required. In sizes up to 2" diameter it can be quenched and tempered to the 100,000 psi yield strength range.
CHEMICAL COMPOSITION: Heat Analysis - ranges and limits %
| Grade | C | Mn | P | S | Ni | Cr | Mo |
|---|---|---|---|---|---|---|---|
| 8620 | .18/.23 | .70/.90 | .035 max | .040 max | .40/.70 | .40/.60 | .15/.25 |
| 8620H | .17/.23 | .60/.95 | .035 max | .040 max | .35/.75 | .35/.65 | .15/.25 |
TYPICAL PROPERTIES: Approximate - not for specification*
| Diameter | Tensile (psi) | Yield (psi) | Elongation | Hardness | Machinability |
|---|---|---|---|---|---|
1" |
87,000 |
52,000 |
26% |
183 HB |
65% |
2" |
82,000 |
51,000 |
27% |
179 HB |
65% |
4" |
80,000 |
50,000 |
28% |
163 HB |
65% |
*As-Rolled
PROCESSING TEMPERATURES: Typical
| Forge | Normalize | Harden | Carburize | Temper |
|---|---|---|---|---|
2250°F max |
1650/1750°F |
1550/1700°F |
1650/1750°F |
300/450°F |
Shapes and Conditions Available:
 | Hot Rolled Rounds through 3" Diameter
| Rough Turned Oversize Rounds from 3-1/4" through 11" Diameter
| Press Forged Rounds from 12" through 18" Diameter
| |
