SAE/AISI 1078 is a carbon steel that is commonly used in the production of flat-rolled products. In order to improve its machinability, this material is often annealed after being cold drawn, or cold rolled. Here’s everything you need to know about SAE 1078.
AISI 1078 Composition
| Element | Content (%) |
|---|---|
| Iron, Fe | 98.46 – 98.98 |
| Carbon, C | 0.720 – 0.850 |
| Manganese, Mn | 0.30 – 0.60 |
| Phosphorous, P | 0.050 |
| Sulfur, S | 0.040 |
AISI 1078 Physical Properties
| Properties | Metric | Imperial |
|---|---|---|
| Density | 7.7-8.03 g/cm3 | 0.278-0.290 lb/in³ |
AISI 1078 Mechanical Properties
| Properties | Metric | Imperial |
|---|---|---|
| Elastic modulus | 190-210 GPa | 29700-30458 ksi |
| Poisson’s ratio | 0.27-0.30 | 0.27-0.30 |
AISI 1078 Thermal Properties
| Properties | Conditions | ||
|---|---|---|---|
| T (ºC) | Treatment | ||
| Thermal expansion co-efficient | 15.7 x (10-6/ ºC) | 20 – 1000 | annealed |
| Thermal conductivity | 47.8 W/mK | 0 | – |
AISI 1078 Equivalent
- ASTM A29
- ASTM A510
- ASTM A576
- ASTM A713
- ASTM A830
- SAE J1397
- SAE J403
- SAE J412
AISI 1078 Uses
AISI 1078 is a steel alloy with a carbon content between 0.77 and 0.84 per cent and manganese content up to 0.85. Its low sulfur and phosphorus levels make it an ideal material for use in automotive applications, as well as other parts exposed to environments where corrosion may be a problem. Additionally, its ample tensile strength makes it particularly suitable for large components that require forming and forging without cracking or splitting. Benefiting from its adaptability, SAE 1078 is often employed in the production of automotive frames, suspension systems, sprockets and engine parts such as connecting rods, crankshafts and mounts. As a result of these uses and its ability to perform reliably even under extreme conditions, SAE/AISI 1078 has become one of the most widely used steel alloys in industrial production.
Corrosion Resistance
Grade 1078 has good corrosion resistance properties thanks to the presence of manganese in the alloy. However, this material will rust if not protected from the elements.
Heat Resistance
Alloy 1078 has good heat resistance properties and can be used at temperatures up to 800 degrees Fahrenheit without suffering any significant damage.
Heat Treatment
SAE / AISI 1078 can be heat treated by quenching in water and tempering at a temperature between 350 and 1000 degrees Fahrenheit. This will improve the hardness and strength of the material.
Machining
SAE / AISI 1078 can be machined using all of the usual methods, such as turning, drilling, milling, and grinding. However, this material work hardens quickly, so it is important to use sharp cutting tools and plenty of coolants during machining operations.
Welding
SAE/AISI 1078 can be welded using any of the common welding processes, such as oxy-fuel welding, arc welding, or gas metal arc welding. This material should be preheated before welding and post-heated after welding in order to relieve stress.
Conclusion
SAE/AISI 1078 is a versatile carbon steel that can be used in a wide variety of applications. Thanks to its good corrosion resistance and heat resistance properties, this material is well-suited for use in many industries. With proper heat treatment, this material can also be quite strong and hard. If you need carbon steel for your next project, SAE / AISI 1078 should definitely be on your shortlist!
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