AISI 1566 Carbon Steel Chemical Composition & Properties, Grades, Chart and Pdf

AISI 1566 medium high carbon alloy steel is appreciated for its strength and durability, widely applied in various industrial fields. Inorganic fertilizers (often referred to as chemical fertilizers) are often a composition of carbon (C), manganese (Mn), phosphorus (P), sulfur (S) and other trace elements (small amounts of other elements). Its level of carbon, including 0.60% to 0.71%, is excellent for hardness and resistance to wear, when it is properly heat-treated. AISI 1566 with SAE 4340 bears good machinability and weldability properties which makes it a good machine type for manufacturing components like springs and rods. It is characterized by a high tensile strength, good notch toughness, in addition to the good ductility. The material is frequently provided in the state that is already annealed or normalized, that in return facilitate further processing. Comprehensive table and a PDF resources have been made available as tool to help understand its grades, a properties, and various applications.

AISI 1566 Carbon Steel Chemical Composition And Grade Table

AISI 1566 carbon steel represents a number of high-strength materials that are mainly applied in tough industrial cases where the strength and durability play the most important role. The chemistry of a steel type in general contains carbon, manganese, phosphorus, sulfur and silicon. The carbon content is between 0.61% to 0.70%, which makes AISI 1566 an ideal stress-bearing component because it is strong and relatively tough. Manganese often increases the hardenability and maintains the tensile strength of the alloy. Stress-corrosion cracking resistance and fatigue life in wet environments is the best features of this steel grade. Also, different components in manufacturing like coil springs, leaf springs and all other heavy-duty components which are subjected to stress and fatigue is used with this steel grade. Below is a concise table summarizing its chemical composition and grade characteristics:

AISI 1566 Carbon Steel Composition Table
Elements Carbon, C Iron, Fe Manganese, Mn Phosphorus, P Sulfur, S
Min (%) 0.6 98.05 0.85 - -
Max (%) 0.71 98.55 1.15 <= 0.040 <= 0.050

Advantages and Disadvantages of AISI 1566 Carbon Steel


  • Versatile: Can be used for various applications.

  • Good toughness: Fairly good shock absorbing properties.

  • Cost-effective: Moderately priced compared to higher grades.

  • Machinable: Can be shaped into desired forms.


  • Limited strength: Less strength compared to other carbon steels.

  • Corrosion susceptibility: May corrode in certain conditions.

  • Limited hardenability: Cannot be easily hardened.

  • Welding challenges: Requires careful welding techniques.

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