Sep 17 2012
Topics Covered
IntroductionChemical CompositionPhysical PropertiesMechanical PropertiesThermal PropertiesOther Designations
Introduction
Alloy steels comprise a spectrum of steels whose compositions include the elements Ni, Si, Va, C, Mo, Cr, Mn, and B which have been fixed for carbon steels. These steels are more responsive to mechanical and heat treatments than carbon steels.
The following datasheet will provide more details about AISI 4142 alloy steel.
Chemical Composition
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 |
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 |
Other Designations
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