See all Blog Posts What Is Chromoly? Category: Steel Posted: December 13, 2016 What is Chromoly Steel? Chromoly steel is a type of engineering steel that gets its name from a combination of the words “chromium” and “molybdenum” – two of the major alloying elements. Chromoly steel is often used when more strength is required than that of mild carbon steel, though it often comes at an increase in cost. Chromoly falls under the the AISI 41xx designations, and it is important to be aware of the different properties and applications of chromoly steel when deciding which material you need. AISI 4130 Chromoly steel is actually engineering steel grade 4130. The “30” at the end of the grade number designates that it has approximately 0.30% carbon by weight. The added chromium and molybdenum help to give the steel different properties from its mild steel counterpart, AISI 1030, even though they have the same percentage of carbon. The alloying elements found in AISI 4130 help to increase the strength to a level higher than that of AISI 1030, which can be increased even more using a proper hardening procedure. The added chromium helps to increase the steels hardenability and also the corrosion resistance; although other types of materials with more corrosion resisting properties should be considered if the material is to be used in a corrosive environment. The added molybdenum helps to increase the toughness. Other important benefits of AISI 4130 include the ability to be easily hardened by heat treating or work hardening, and the ability to be case hardened using a process called carburizing. In its annealed state, AISI 4130 has good formability, machinability, and is quite weldable. For thick sections or low heat input welding processes, preheat may be necessary and is almost always a good idea. Common Applications The applications of Chromoly steels can be found in a variety of industries. They are very commonly used in automotive, bicycle, and heavy equipment parts, the oil and gas industry, metal production and forming equipment, and many other industries. Here are some more specific examples: Molds Pins Bicycle tubing Furnace equipment Crank shafts Chain links Drill collars Machine shafts Conveyors Tie rods Miscellaneous tooling Metal Supermarkets Metal Supermarkets is the world’s largest small-quantity metal supplier with over 100 brick-and-mortar stores across the US, Canada, and United Kingdom. We are metal experts and have been providing quality customer service and products since 1985. At Metal Supermarkets, we supply a wide range of metals for a variety of applications. Our stock includes: mild steel, stainless steel, aluminium, tool steel, engineering steel, brass, bronze and copper. We carry a wide range of shapes including: bars, tubes, sheets and plates. We can cut metal to your exact specifications. Visit one of our 7 locations in the United Kingdom today. Share: Facebook Twitter LinkedIn E-Mail Tags: chromoly, Steel Related blog articles What is Steel Pickling? Differences Between Hot Dip and Electrolytic Galvanising What is Silver Steel?