Sep 26 2012
Topics Covered
IntroductionChemical CompositionPhysical PropertiesMechanical PropertiesThermal PropertiesOther Designations
Introduction
Alloy steels comprise many types of steels whose compositions exceed the limitations of C, Mo, Cr, Va, Mn, Ni, Si, and B allocated for carbon steels. These steels are more responsive to mechanical and heat treatments than carbon steels.
The following datasheet will provide details about AISI 4820H alloy steel.
Chemical Composition
The following table shows the chemical composition of AISI 4820H alloy steel.
Element |
Content (%) |
Iron, Fe |
94.495-95.88 |
Nickel, Ni |
3.20-3.80 |
Manganese, Mn |
0.400-0.800 |
Molybdenum, Mo |
0.200-0.300 |
Carbon, C |
0.170-0.230 |
Silicon, Si |
0.150-0.300 |
Sulfur, S |
≤ 0.0400 |
Phosphorous, P |
≤ 0.0350 |
Physical Properties
The physical properties of AISI 4820H 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 annealed AISI 4820H alloy steel are given in the table below.
Properties |
Metric |
Imperial |
Tensile strength |
685 MPa |
99400 psi |
Yield strength |
460 MPa |
66700 psi |
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 |
197 |
197 |
Hardness, Knoop (converted from Brinell hardness) |
219 |
219 |
Hardness, Rockwell B (converted from Brinell hardness) |
92 |
92 |
Hardness, Rockwell C (converted from Brinell hardness, value below normal HRC range, for comparison purposes only) |
13 |
13 |
Hardness, Vickers (converted from Brinell hardness) |
207 |
207 |
Machinability (annealed and cold drawn, based on 100 machinability for AISI 1212 steel) |
50 |
50 |
Thermal Properties
The thermal properties of AISI 4820H alloy steel are outlined below.
Properties |
Metric |
Imperial |
Thermal conductivity |
44.5 W/mK |
309 BTU in/hr.ft².°F |
Other Designations
Equivalent materials to AISI 4820H alloy steel are listed below: