8620 As Rolled/8620H

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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