4130
(Chromoly)
AISI 4130 is a form of, and is also known as, chromoly steel. Chromoly contains two main alloying metals – chromium and (.8% – 1.1%) molybdenum, hence the name Chromoly, as well as iron, carbon, and other alloying elements. This combination of chromium and molybdenum provides many additional benefits compared to mild Carbon steel making it an ideal choice for many projects.
The American Iron and Steel Institute (AISI) created designations for different types and grades of steel. They are all four number designations with the first two numbers indicating the type of material selected and the latter two numbers representing the amount of Carbon present in the Steel. Mild steel is 1030 due to its different composition yet similar amount of Carbon in each material. The major difference between the two due to the alloying elements and proper hardening procedures. The additional chromium in 4130 increases the hardenability, strength, and corrosion resistance of the steel, while the molybdenum increases the toughness of the steel. It is important to note, while the chromium increases the corrosion resistance of the metal it is not as resistant as stainless steel and should not be used in high corrosive environments.
What are the benefits of 4130
- Strong - 4130 is considerably stronger and harder than standard tubing. It has a yield strength of 90k to 100k PSI and tensile strength of 110k to 120k PSI.
- Light – It is a relatively lightweight metal with an excellent weight to strength ratio compared to mild carbon steel.
- Ductile - Its relatively low Carbon content makes it easy to weld and machine, almost as easy as 1018 carbon steel tubing. 4130 is also able to be case hardened through carburization, and it is easily hardened through heat treating or work hardening.
- Consistent – It’s wall and Outer Dimension are more consistent – a distinct advantage during build season.
Industries that use 4130
- Aerospace / Aircraft
- Auto Racing
- Military
- Automotive
- Bicycle / Motorcycle
- Oil and Gas
- Metal Production and Farming Equipment
- Machine Tooling
- Cranes and Heavy Lifting Equipment
Specific Uses:
- Molds
- Pins
- Bicycle Tubing / Frames
- Furnace Equipment
- Crank Shaft
- Chain Links
- Drill Collars
- Machine Shafts
- Conveyors
- Tie rods
- Miscellaneous Tooling
- Roll Cages