SAE – AISI 1139 Carbon Steel (UNS G11390) – Composition, Properties and Uses
AISI 1139 is a versatile alloy steel that can be used for a variety of applications. This steel has good corrosion resistance, heat resistance, and machinability. It can be welded and is heat treatable. In this blog post, we will take a closer look at the properties of SAE 1139 and how it can be used in various applications.
AISI 1139 Composition
| Element | Content (%) |
|---|---|
| Iron, Fe | 97.68 – 98.3 |
| Manganese, Mn | 1.35 – 1.65 |
| Carbon, C | 0.350 – 0.430 |
| Phosphorous, P | 0.0400 |
| Sulfur, S | 0.200 |
AISI 1139 Physical Properties
| Properties | Metric | Imperial |
|---|---|---|
| Density | 7.7-8.03 g/cm3 | 0.278-0.290 lb/in3 |
AISI 1139 Mechanical Properties
| Properties | Metric | Imperial |
|---|---|---|
| Elastic modulus | 190-210 GPa | 27557-30458 ksi |
| Poisson’s ratio | 0.27-0.30 | 0.27-0.30 |
Applications
Some common applications for UNS G11390 include fasteners, chains, sprockets, gears, shafts, axles, forgings, stampings, castings; pressure vessels; boiler tubes; structural tubing; truck frames; agricultural equipment; railroad cars; construction equipment; mining equipment; marine equipment; oil field equipment; pipelines; pressure vessels; boiler tubes; structural tubing.
Machinability
The machinability rating of SAE / AISI 1139 is 50%, which means that it can be machined at the rate of 50% compared to free-machining carbon steels using high speed tools under ideal conditions.
Welding
grade 1139 can be welded using most welding processes, including oxyacetylene welding, arc welding, and resistance welding.
Heat Treatment
Preheat and post-weld heat treatment are not required for alloy 1139. This steel can also be welded using gas metal arc welding and gas tungsten arc welding without any preheat or post-weld heat treatment requirements as well.
Corrosion Resistance
The corrosion resistance of SAE / AISI 1139 is fair to good in most environments, including freshwater, seawater, brine solutions, acids, alkalis, and some organic compounds such as oils and greases.
Heat Resistance
The heat resistance of SAE / AISI 1139 is fair to good in most environments, including freshwater, seawater, brine solutions, acids, alkalis, and some organic compounds such as oils and greases.
Conclusion
As you can see from the above information, SAE / AISI 1139 is a versatile alloy steel with many uses in various industries, including automotive, construction, mining, marine, oil field, and more.
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