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These are "triple alloy" carburizing steels. The nickel imparts good toughness and ductility, and the chromium and molybdenum contribute increased hardness penetration and wear. They are readily carburized, and the well-balanced alloy content permits hardening to produce a strong, tough core and high case hardness. They have excellent machinability and respond 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.

Stock Lengths 10' to 12'
Unit of Measure

Specifications

Estimated Weight per Foot

 N/A 40.14 lb

Estimated Weight 12-Ft. Bar

 N/A 481 6 lb

Analysis

N/A Carbon .18/.23
Manganese .70/.90
Phosphorus .035 Max.
Sulphur .04 Max.
Si. .15/.35
Cr. .40/.60
Ni. .40/.70
Mo. .15/.25
The analysis of the leaded grade is the same as above, with the addition of .15/.35 Lead (Pb).

Applications

N/A Gears, pinions, spline shafts, piston pins, oil pump piston rods and liners, cams, oil tool slips, gauges, jigs, plastic molds, jaws, etc.

Machinability

N/A 86L20 has a machinability rating of approximately 77% of 1212, as compared with a rating of 66% for the same analysis without lead. Surface cutting speed is approximately 127 feet per minute.

Weldability

N/A 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, adequate ventilation should be provided to prevent accumulation of fumes.

Forging

N/A Heat to 2150°-2250°F

Normalizing

N/A Heat to 1650°-1750°F. Air cool. Average Brinell, 187.

Annealing

N/A Heat to 1550°-1600°F. Furnace cool. Average Brinell, 156.

Carburizing

N/A Standard treatment, carburize 1650°-1700°F for eight hours oil quench. Temper between 300°-450°F.