To be classified as an alloy bar, a range or minimum amount of alloying elements such as nickel, molybdenum, chromium, vanadium, etc. is specified or elements are added to obtain an alloying effect. Alloy steel bars and plates are generally given some type of appropriate thermal processing such as annealing or quench and tempering. The addition of alloying elements increases the alloy bar's or plate's hardenability (note: alloying elements do not make the metal harder just by their existence in metal, but rather increase the depth to which the alloy bar or alloy plate can be hardened by appropriate heat treatment). The proper alloy can also provide improved fatigue strength in addition to increased wear and toughness. Alloy metals have the potential to achieve superior combinations of properties not attainable with other metals.
Alro stocks alloy bars as Cold Drawn or Hot Rolled. They are typically annealed or heat treated, quenched and tempered.
Heat Treated Alloy
Heat treating attains required mechanical properties, typically at the expense of machinability. Heat treated bars are often stress relieved. Alloy has the ability to increase hardenability through heat treating. This makes it possible to obtain desired mechanical properties in larger sections.
Alloy Grades stocked by Alro include:
More About Alloy Grades
4140 contains chromium and molybdenum as alloying elements and may be heat treated over a wide range to give the combined advantages of proper hardness, strength and ductility.
4150, 4150R, 4150 HR Q&T Especially suitable for service applications, 4150R HR Q&T SR is a free-machining alloy steel that provides an outstanding combination of heat treated properties and superior machinability.
AISI 4340 Alloy
AISI 4340 Used for heavily pressed parts, 4340 is a highly alloyed steel with high nickel and chromium content which assures deep hardening when oil quenched, with high strength characteristics throughout the section.
6150 is an electric furnace melt of chrome vanadium steel that possesses bright polish, high torque strength, and medium hardness. It is typically used for heavy machinery parts, high strength studs, arbors, and more.
AISI 8620/86L20 is used extensively as a carburizing alloy steel. It has extreme surface hardenability and internal strength.