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AISI 4140 (MOD) Pre-Hardened
DCF (Also available in Hot Rolled)
4140 is a fine pre-hardened alloy steel, ready for use and is machinable in its hardened state 260/321 Brinell. Material can be flame hardened at wear points to approximately 85% of a 1.00 carbon steel.
TYPICAL APPLICATIONS
Strippers, Holder Blocks, Mold Bases, Ejectors, Back Up and Support Tooling, Fixtures, Jigs, Molds, Cams, and many more applications where time and money are important considerations.
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TYPICAL ANALYSIS |
AISI 4140 (MOD) |
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Carbon (C) |
.36/.46 |
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Manganese (Mn) |
70/1.30 |
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Silicon (Si) |
.15/.45 |
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Vanadium |
.015 MAX |
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Molybdenum (Mo) |
.15/.35 |
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Chromium (Cr) |
.75/1.20 |
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Phosphorus (P) |
.035 MAX |
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Sulphur (S) |
.040 MAX |
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Nickel (Ni) |
.50 MAX |
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FORGING (a)
Start forging at
Do not forge below |
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NORMALIZING (b) |
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ANNEALING (c)
Temperature
Rate of cooling, max. per hour
Typical annealed hardness, Brinell |
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HARDENING
Rate of heating
Preheat temperature
Hardening temperature
Time at temperature, minutes
Quenching medium |
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TEMPERING
Tempering temperature
Approx. tempered hardness, Rockwell C |
26-34 |
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WEAR RESISTANCE |
Medium |
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TOUGHNESS |
Very High |
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RESISTANCE TO SOFTENING EFFECT OF ELEVATED
TEMPERATURE |
Low |
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DEPTH OF HARDENING |
Medium |
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MACHINABILITY |
Medium |
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GRINDABILITY |
High |
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DISTORTION IN HEAT TREATING |
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SAFETY IN HARDENING |
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RESISTANCE TO DECARBURIZATION |
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