Alloy Steel 4142 Forging
Introduction
AISI 4142 is a Standard grade Alloy Steel. It is commonly called AISI 4142 Chromium-molybdenum steel. It is composed of (in weight percentage) 0.40-0.45% Carbon (C), 0.75-1.00% Manganese (Mn), 0.035%(max) Phosphorus (P), 0.04%(max) Sulfur (S), 0.15-0.30% Silicon (Si), 0.80-1.10% Chromium (Cr), 0.15-0.25% Molybdenum (Mo), and the base metal Iron (Fe). Other designations of AISI 4142 alloy steel include UNS G41420 and AISI 4142.Equivalent materials to AISI 4142 alloy steel are:
- ASTM A322
- ASTM A331
- ASTM A505
- ASTM A519
- ASTM A547
- SAE J404
- SAE J412
- SAE J770
- ASTM A29
- ASTM A372 (VIII)
- ASTM A711
- ASTM A752
- ASTM A829
- SAE J1397
The following table shows the chemical composition of AISI 4142 alloy steel.
| Element | Content (%) |
|---|---|
| Iron, Fe | ≥ 96.725 |
| Chromium, Cr | 0.80-1.10 |
| Manganese, Mn | 0.75-1.10 |
| Carbon, C | 0.40-0.45 |
| Silicon, Si | 0.15-0.30 |
| Molybdenum, Mo | 0.15-0.25 |
| Sulfur, S | ≤ 0.040 |
| Phosphorous, P | ≤ 0.035 |
Physical Properties
The physical properties of AISI 4142 alloy steel are outlined in the following table.| Properties | Metric | Imperial |
|---|---|---|
| Density | 7.85 g/cm3 | 0.284 lb/in³ |
Mechanical Properties
The mechanical properties of AISI 4142 alloy steel are highlighted below.| Properties | Metric | Imperial |
|---|---|---|
| Elastic modulus | 190-210 GPa | 27557-30458 ksi |
| Bulk modulus (typical for steel) | 140 GPa | 20300 ksi |
| Shear modulus (typical for steel) | 80 GPa | 11600 ksi |
| Poisson’s ratio | 0.27-0.30 | 0.27-0.30 |
| Hardness, Brinell (annealed and cold drawn) | 187-229 | 187-229 |
| Hardness, Knoop (converted from Brinell hardness) | 230 | 230 |
| Hardness, Rockwell B (converted from Brinell hardness) | 94 | 94 |
| Hardness, Rockwell C (converted from Brinell hardness, value below normal HRC range, for comparison purposes only) | 15 | 15 |
| Hardness, Vickers (converted from Brinell hardness) | 218 | 218 |
| Machinability (annealed and cold drawn, based AISI 1212 steel, as on 100 machinability) | 65 | 65 |
Alloy Steel 4142 Forging
Thermal Properties
The thermal properties of AISI 4142 alloy steel are outlined below.| Properties | Metric | Imperial |
|---|---|---|
| Thermal conductivity | 42.6 W/mK | 296 BTU in/hr.ft².°F |
Source: azom and efunda
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