ThePipingMart Blog Grades SAE – AISI 1139 Carbon Steel (UNS G11390) – Composition, Properties and Uses

SAE – AISI 1139 Carbon Steel (UNS G11390) – Composition, Properties and Uses

SAE / AISI 1139

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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