Chemical Composition
Carbon (C) .18/.23
Manganese (Mn) .70/.90
Silicon (Si) .15/.30
Nickel (Ni) .40/.70
Molybdenum (Mn) .15/.25
Chromium (Cr) .40/.60
Phosphorus (P) .035 MAX
Sulphur (S) .040 MAX
*Lead .15/.35
*Applies only to 8620 leaded alloy steel bars.
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86L20 Cold Finish Bar Steel
Alro stocks 86L20 Cold Finish Bars. 8620 is the most widely used carburizing alloy. The "L" is a lead additive to improve machinability. The nickel content imparts good toughness and ductility, and the chromium and molybdenum increases hardness penetration and wearability. The end result is a produce with a strong tough core and high case hardness. It machines at 110 SFM and has good welding qualities. In the leaded grade, 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.
Alro also stocks 8620 CF (Cold Finish) and 8620 HR (Hot Rolled). Shapes include plate, rounds, flats, bars, and squares.
Properties
Tensile Strength: 95,000 PSI
Yield Strength: 80,000 PSI
Elongation: 15% (in 2")
*These numbers are "Typical" properties and may not be required to meet this grade. Please check with your Alro Sales Representative if physical properties are required for your application.*
Typical Uses
86L20 CF Bars are typically used in:
- Gears
- Pinions
- Spline Shafts
- Applications requiring a hard wear surface and ductile core
86L20 CF Bars are not recommended for applications over 400°F since at elevated temperature ductility is low.
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