Sep 17 2012
Topics Covered
IntroductionChemical CompositionPhysical PropertiesMechanical PropertiesThermal PropertiesOther DesignationsApplications
Introduction
Alloy steels contain elements such as chromium, cobalt, nickel etc. These steels can be subjected to specific melting and deoxidization processes for particular kind of applications.
Alloy steels comprise a wide range of steels whose compositions exceed the limitations of Si, Va, Cr, Ni, Mo, Mn, B and C allocated for carbon steels. In comparison with carbon steels, alloy steels are a lot more responsive to mechanical and heat treatments.
The following datasheet provides an overview of AISI 1340 alloy steel.
Chemical Composition
The chemical composition of AISI 1340 alloy steel is outlined in the following table.
| Element |
Content (%) |
| Iron, Fe |
97.25-97.87 |
| Manganese, Mn |
1.60-1.90 |
| Carbon, C |
0.380-0.430 |
| Silicon, Si |
0.15-0.35 |
| Sulfur, S |
≤ 0.040 |
| Phosphorous, P |
≤ 0.035 |
Physical Properties
The following table shows the physical properties of AISI 1340 alloy steel.
| Properties |
Metric |
Imperial |
| Density (typical for steel) |
7.87 g/cm3 |
0.284 lb/in³ |
Mechanical Properties
The mechanical properties of annealed AISI 1340 alloy steel are displayed in the following table.
| Properties |
Metric |
Imperial |
| Tensile strength |
703 MPa |
102000 psi |
| Yield strength |
434 MPa |
62900 psi |
| Bulk modulus (typical for steel) |
140 GPa |
20300 ksi |
| Shear modulus (typical for steel) |
80.0 GPa |
11600 ksi |
| Elastic modulus |
190-210 GPa |
27557-30458 ksi |
| Poisson's ratio |
0.27-0.30 |
0.27-0.30 |
| Elongation at break (in 50 mm) |
25.50% |
25.50% |
| Reduction of area |
57.30% |
57.30% |
| Izod Impact |
46.0 J |
33.9 ft-lb |
| Hardness, Brinell |
207 |
207 |
| Hardness, Knoop (converted from Brinell hardness) |
207 |
207 |
| Hardness, Rockwell B (converted from Brinell hardness) |
93 |
93 |
| Hardness, Rockwell C (converted from Brinell hardness) |
15 |
15 |
| Hardness, Vickers (converted from Brinell hardness) |
217 |
217 |
| Machinability (based on 100 machinability for AISI 1212 steel) |
50 |
50 |
Thermal Properties
The thermal properties of AISI 1340 alloy steel are given in the following table.
| Properties |
Metric |
Imperial |
| Thermal expansion co-efficient (@20°C/68°F) |
11.5 µm/m°C |
6.39 µin/in°F |
| Thermal conductivity |
51.9 W/mK |
360 BTU in/hr.ft².°F |
Other Designations
Equivalent materials to AISI 1340 alloy steel are given in the below table.
| ASTM A322 |
ASTM A331 |
ASTM A547 |
SAE J412 |
| ASTM A519 |
SAE J404 |
MIL SPEC MIL-S-16974 |
SAE J770 |
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Applications
AISI 1340 alloy steel is used in recessed-head screws, high-strength bolts, machined components, socket screws, screws, construction applications and cap screws.