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Pre-Hardened



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.

TYPICAL ANALYSIS

AISI 4140 (MOD)

Carbon (C)

.36/.46

Manganese (Mn)

70/1.30

Silicon (Si)

.15/.45

Vanadium

.015 MAX

Molybdenum (Mo)

.15/.35

Chromium (Cr)

.75/1.20

Phosphorus (P)

.035 MAX

Sulphur (S)

.040 MAX

Nickel (Ni)

.50 MAX

FORGING (a)
Start forging at
Do not forge below

NORMALIZING (b)

ANNEALING (c)
Temperature
Rate of cooling, max. per hour
Typical annealed hardness, Brinell

HARDENING
Rate of heating
Preheat temperature
Hardening temperature
Time at temperature, minutes
Quenching medium

TEMPERING
Tempering temperature
Approx. tempered hardness, Rockwell C

26-34

WEAR RESISTANCE

Medium

TOUGHNESS

Very High

RESISTANCE TO SOFTENING EFFECT OF ELEVATED
TEMPERATURE

Low

DEPTH OF HARDENING

Medium

MACHINABILITY

Medium

GRINDABILITY

High

DISTORTION IN HEAT TREATING

SAFETY IN HARDENING

RESISTANCE TO DECARBURIZATION

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