8620 RD Alloy Material Information

8620 is a “triple alloy” carburizing material.  The nickel properties imparts good toughness and ductility, and the chromium and molybdenum contribute increased hardness penetration and wear.  8620 material is readily carburized, and the well-balanced alloy content permits hardening to produce a strong, tough core and high case hardness.  8620 material has excellent machinability and responds well to polishing operations.  Because of the fine combination of properties that may be developed, as well as the ease with which it may be processed, this material is ideal for a wide variety of applications.

 In the leaded analysis, machinability is improved without the sacrifice of other desirable properties, with the exception that the use of this material is not recommended for applications over 400 F, since at elevated temperature ductility is low.

 8620 material is easily welded by any of the common welding procedures, with the rod to be used dependent upon the section, design, service requirements, etc.  Preheating and stress relieving is recommended.  When welding leaded material (86L20). Adequate ventilation should be provided to prevent accumulation of fumes.

 The combination of properties makes 8620 material an ideal choice for a variety of applications such as gears, pinions, spline shafts, piston pins, oil pump piston rods and liners, cams, oil tool slips, gauges, jigs, plastic molds, jaws, etc.

Flats · Sizes available upon request
Rounds

· Upto 1” +/- .005 upto .009

 · 1” to under 6” +/- .010 upto .078125

 · 6” and over +/- .125 upto .250

Forging Heat to 2150-2250 F
Normalizing

Heat to 1650-1750 F

Air cool

Ave. Brinell 187
Annealing

Heat to 1550-1600 F

Furnace cool

Ave. Brinell 156
Carburizing

Standard treatment

Carburize 1650-1700 F for 8 hours, oil quench.

Temper between 300-450 F
8620 Material In Stock Color Code: Blue & White
Flat Dimensions · Sizes available upon request
Round Dimensions

· ½” upto 12”

· Other sizes available upon request.
8620 Typical Analysis

C

Mn

P Max.

S Max.

Si

Cr

Ni

Mo

.18 / .23

.70 / .90

0.35

.040

.15 / .35

.40 / .60

.40 / .70

.15 / .25

 · The analysis of the leaded grade (86L20) is the same as above, with the addition of .15 / .35 Pb (lead).