AISI 1340 is a Standard grade Alloy Steel. It is commonly called AISI 1340 Manganese steel. It is composed of (in weight percentage)
0.38-0.43% Carbon (C),
1.60-1.90% Manganese (Mn),
0.035%(max) Phosphorus (P),
0.04%(max) Sulfur (S),
0.15-0.30% Silicon (Si),
and the base metal Iron (Fe).
Other designations of AISI 1340 alloy steel include UNS G13400 and AISI 1340.
Steel is the common name for a large family of iron alloys. Steels can either be cast directly to shape, or into ingots which are reheated and hot worked into a wrought shape by forging, extrusion, rolling, or other processes. Wrought steels are the most common engineering material used, and come in a variety of forms with different finishes and properties. Alloy steels are steels that exceed the element limits for Carbon steels. However, steels containing more than 3.99% chromium are classified differently as stainless and tool steels. Alloy steels also includes steels that contain elements not found in carbon steels such as nickel, chromium (up to 3.99%), cobalt, etc.
The typical elastic modulus of alloy steels at room temperature (25°C) ranges from 190 to 210 GPa. The typical density of alloy steels is about 7.85 g/cm3. The typical tensile strength varies between 758 and 1882 MPa. The wide range of ultimate tensile strength is largely due to different heat treatment conditions.
| AISI 1340 | |
 | |
| Category | Steel |
| Class | Alloy steel |
| Type | Standard |
| Common Names | Manganese steel |
| Designations | United States: ASTM A322 , ASTM A331 , ASTM A519 , ASTM A547 , MIL SPEC MIL-S-16974 , SAE J404 , SAE J412 , SAE J770 , UNS G13400 |
| Composition | |
| |
| Element | Weight % |
| C | 0.38-0.43 |
| Mn | 1.60-1.90 |
| P | 0.035 (max) |
| S | 0.04 (max) |
| Si | 0.15-0.30 |
| Mechanical Properties | |
| |
| Properties | Conditions | ||
| T (°C) | Treatment | ||
| Density (×1000 kg/m3) | 7.7-8.03 | 25 | |
| Poisson's Ratio | 0.27-0.30 | 25 | |
| Elastic Modulus (GPa) | 190-210 | 25 | |
| Tensile Strength (Mpa) | 703.3 | 25 | annealed at 800°C more |
| Yield Strength (Mpa) | 436.4 | ||
| Elongation (%) | 25.5 | ||
| Reduction in Area (%) | 57.3 | ||
| Hardness (HB) | 207 | 25 | annealed at 800°C more |
| Impact Strength (J) (Izod) | 70.5 | 25 | annealed at 800°C more |
Source: efunda.com
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