SAE 8660 Chemical Composition

In addition to iron and carbon, other elements are added to steel, which is called alloy steel. An iron-carbon alloy composed of one or more alloying elements added on the basis of ordinary carbon steel. According to the different added elements, and take appropriate processing technology, can obtain high strength, high toughness, wear resistance, corrosion resistance, low temperature resistance, high temperature resistance, non-magnetic and other special properties.

Main alloy element SAE8660H hardenability alloy structural steel UNS H86600 steel plate round bar steel strip

The main alloying elements of alloy steel are silicon, manganese, chromium, nickel, molybdenum, tungsten, vanadium, titanium, niobium, zirconium, cobalt, aluminum, copper, boron, rare earth and so on. Among them, vanadium, titanium, niobium, zirconium, etc. are strong carbide forming elements in steel, as long as there is enough carbon, under appropriate conditions, they can form their own carbides, when carbon is lacking or under high temperature conditions, they enter the solid solution in an atomic state; Manganese, chromium, tungsten and molybdenum are carbide forming elements, some of which enter the solid solution in the atomic state, and the other part forms a replacement alloy cementite. Aluminum, copper, nickel, cobalt, silicon, etc., do not form carbide elements, generally exist in an atomic state in solid solutions

SAE 8660 Chemical composition and Mechanical properties:

Mechanical Properties:

Thermal Properties:

Physical Properties:

Classification of alloy steels General classification

Alloy steel

There are many kinds of alloy steel, usually divided into low alloy steel according to the content of alloying elements (content < 5%), medium alloy steel (content 5% ~ 10%), high alloy steel (content > 10%); According to the quality is divided into high quality alloy steel, special alloy steel; According to the characteristics and uses, it is divided into alloy structural steel, stainless steel, acid-resistant steel, wear-resistant steel, heat-resistant steel, alloy tool steel, rolling bearing steel, alloy spring steel and special performance steel (such as soft magnetic steel, permanent magnetic steel, non-magnetic steel).

In addition to iron, carbon and a small amount of unavoidable silicon, manganese, phosphorus, sulfur in steel, but also contains a certain amount of alloying elements, the alloying elements in steel are silicon, manganese, molybdenum, nickel, chromium, alum, titanium, niobium, boron, lead, rare earth and other one or several, this steel is called alloy steel. Countries of alloy steel system, with their resources, production and use conditions are different, foreign countries have previously developed nickel, steel system, China is found to silicon, manganese, vanadium, titanium, niobium, boron, lead, rare earth based alloy steel system in the total output of steel accounted for about ten percent, generally in electric furnace smelting according to the use of alloy steel can be divided into 8 categories, They are: alloy structural steel, spring steel, bearing steel, alloy tool steel, high-speed tool steel, stainless steel, heat-resistant non-peeling steel, electrical silicon steel.