8620 As Rolled/8620H
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 %
C
.18/.23
Mn
.70/.90
P
.035 Max
S
.040 Max
Ni
.40/70
Cr
.35/.60
Mo
.15/.25
Typical Properties
Approximate - not for specification
1"
.
Tensile (psi)
87,000
Yield (psi)
52,000
Elongation
26%
Hardness
183 HB
Machinability
65%
2"
.
Tensile (psi)
82,000
Yield (psi)
51,000
Elongation
27%
Hardness
179 HB
Machinability
65%
4"
.
Tensile (psi)
80,000
Yield (psi)
50,000
Elongation
28%
Hardness
163 HB
Machinability
65%
Processing Temperatures
Typical
Forge
2250°F Max
Normalize
1650/1750°F
Case Harden
1550/1750°F
Anneal
1650/1750°F Max
Temper
300°F & 450°F