Jun 20 2013
Topics Covered
Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Other Designations
Applications
Introduction
Steel is a metal alloy chiefly consisting of iron in addition to small amounts of carbon based on the grade and quality of the steel. Alloy steel is a type of steel to which one or more elements besides carbon have been added to form a desired mechanical property.
AISI 4142H is a chromium-molybdenum steel whose mechanical properties and toughness can be improved after heat treatment. The following section will discuss in detail about AISI 4142H alloy steel.
Chemical Composition
The chemical composition AISI 4142H alloy steels is outlined in the following table.
|
Element |
Content (%) |
|
Iron, Fe |
96.615 - 97.91 |
|
Chromium, Cr |
0.75 - 1.2 |
|
Manganese, Mn |
0.65 - 1.1 |
|
Carbon, C |
0.39 - 0.46 |
|
Silicon, Si |
0.15 - 0.30 |
|
Molybdenum, Mo |
0.15 - 0.25 |
|
Sulfur, S |
≤ 0.040 |
|
Phosphorous, P |
≤ 0.035 |
Physical Properties
The following table shows the physical properties of AISI 4142H alloy steels.
|
Properties |
Metric |
Imperial |
|
Density |
7.85 g/cm3 |
0.284 lb/in3 |
Mechanical Properties
The mechanical properties of AISI 4142H alloy steels are displayed in the following table.
|
Properties |
Metric |
Imperial |
|
Modulus of elasticity |
205 GPa |
29700 ksi |
|
Bulk modulus |
140 Gpa |
20300 ksi |
|
Shear modulus |
80 Gpa |
11600 ksi |
|
Poisson’s ratio |
0.29 |
0.29 |
|
Hardness, Brinell |
187 - 229 |
187 - 229 |
|
Hardness, Vickers |
218 |
218 |
|
Hardness, Knoop |
230 |
230 |
|
Hardness, Rockwell C |
15 |
15 |
|
Hardness, Rockwell B |
94 |
94 |
|
Machinability |
65 |
65 |
Thermal Properties
The thermal properties of AISI 4142H alloy steels are given in the following table
|
Properties |
Metric |
Imperial |
|
Thermal conductivity |
42.6 W/mK |
296 BTU.in/hrft².°F |
Other Designations
Other designations that are equivalent to AISI 4142H alloy steels include the following.
-
DIN 1.7223
-
UNI 38 CrMo 4
-
ASTM A304
-
SAE J1268
Applications
The following are the list of applications of AISI 4142H alloy steels:
-
Break and bending dies
-
Die holders
-
Flanges
-
Collets
-
Spindles, axles, clutch parts
-
Forming rolls
-
Machine tool components
-
Wrenches and other hand tools