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Your present location:Home >> Products >> Alloy Tool Steel >> 4140 >> 4140/42CrMo4/SCM440 Alloy Tool Steel
  • Product Name: 4140/42CrMo4/SCM440 Alloy Tool...
  • Product ID: 20178304
  • Views : 666

AISI or SAE 4140 grade is a low-alloy steel containing chromium and molybdenum as strengthening agents. 

Chemical Composition

C

Si

Mn

S

P

Cr

Mo

Ni

Cu

0.38-0.48

0.17-0.37

0.50-0.80

≤0.035

≤0.035

0.90-1.20

0.15-0.25

≤0.030

≤0.030

 

Characteristics

1. Ultrahigh-strength steel with high intensity and toughness.

2. Good hardenability, good fatigue limit and capacity of impact resistance after Q+T.

3. No obvious temper brittleness.

 

Equivalents

America       Germany           Japan

4140          42CrMo4          SCM440

 

Forging Technique

Heat temperature

Initial forging temperature

Final forging temperature

Cooling

1150-1200

1130-1180

>850

Burial pit beyond 60mm

 

Heat treatment technique

Item

Heat  treatment in advance

Final Heat treatment ( Plan 1)

 Final Heat treatment ( Plan 2)

Normalizing

High tempering

Quenching

Quenching

Tempering

Induction hardening

 Tempering

Temperature

850-900

680-700

820-840

840-880

450-670

900

150-180

 Cooling

in air

in air

water

oil

oil or air

 Emulsion

 air

Hardness

 

≤217HBS

 

 

 

≥53HRC

≥50HRC

 

Application

1. For making crucial mechanical parts with high intensity and large cross dimensions, such as shaft, gear and connecting rod.

2. For making large and medium size plastic mould.

 

Delivery condition

Usually, delivery condition is hot rolled or forged. After annealing, hardness is below 229HB.

Heat treatment is also available according to customers requirement.