What is 1065 Carbon Steel?

1065 carbon steel is a high-carbon alloy containing around 0.65% carbon, known for its excellent hardness and good wear resistance. This higher carbon content gives 1065 steel a fine-grained microstructure, making it well-suited for applications where edge retention and strength are crucial. Common uses include knives, swords, chisels, and various cutting tools that demand a sharp, long-lasting edge. In addition, its ability to achieve a high level of hardness through heat treatment means 1065 carbon steel can maintain durability under demanding conditions.

However, like most high-carbon steels, 1065 carbon steel can be prone to corrosion if not properly maintained. Regular oiling or protective coatings can help mitigate this issue. It also requires careful heat treatment to avoid potential brittleness. Despite these considerations, 1065 carbon steel remains a popular choice for applications that prioritize cutting performance, hardness, and wear resistance—striking an appealing balance between capability and cost.

1065 Carbon Steel Equivalents

1065 Carbon Steel is a high-carbon steel commonly used for cutting tools and springs. Its equivalents across international standards are:

• AISI/ASTM: 1065
• JIS (Japan): SS65
• KS (Korea): SS 65
• China: 65#
• Europe: C65
• IS (India): IS 226/1065

1065 Carbon Steel Chemical Composition

1065 carbon steel is classified as a high-carbon steel, with a specific composition that defines its properties.

The balance of these elements results in a material that combines moderate strength with excellent formability, making it suitable for a wide range of industrial applications.

1065 Carbon Steel Mechanical Properties

1065 carbon steel exhibits reliable mechanical properties, distinguishing it as a widely used material in manufacturing.

The hot and cold rolling processes for 1065 carbon steel have their own focus. Hot rolling forms large-size products by heating and rolling at high temperatures. After cooling, it is finished to improve size and surface quality. Cold rolling uses pickled hot rolled coils as raw material. Multiple passes are rolled at room temperature to improve precision and surface quality. Plasticity and toughness are subsequently restored by annealing. Suitable for demanding applications.

Manufacturing Forms and Processes

1065 Carbon Steel Castings are commonly used to manufacture mechanical parts and structural components. Such as hubs, shafts, connecting rods, gears and so on. It has high strength and durability. Its production process includes raw material preparation, melting, pouring, cooling and opening. Ensure the quality of steel and precise shape of castings.

After cooling, the castings need to be cleaned and machined. Including heat treatment, shot blasting, polishing and painting. To improve the surface quality and performance. So as to meet the actual application requirements.

1065 Carbon Steel Applications

1065 Carbon Steel is widely used in the following areas :

Spring manufacturing: such as vehicle suspension springs, valve springs, compression springs, extension springs, etc., to take advantage of its high elastic limit and fatigue strength.

Mechanical parts: such as shafts, connecting rods, gears, etc., can withstand high stress and have good wear resistance.

Tool steels: used in the manufacture of cutting tools, stamping dies, etc. They excel in applications where high hardness and wear resistance are required.

Cutting tools and sharpening tools: such as saw blades, knives, etc., especially in applications requiring high hardness and wear resistance.

Washers and fasteners: capable of meeting certain strength and hardness requirements.

Advantages of 1065 Carbon Steel

• High strength and high elasticity: after appropriate heat treatment. Such as quenching and tempering, can obtain high strength and elasticity. It is suitable for manufacturing parts that need to withstand high stress and have good elasticity.
• Good hardenability: Contains an appropriate amount of manganese. Helps to maintain a uniform hardness during hardening. Improves the comprehensive performance of the material.
• Good wear resistance: Higher carbon content gives it better wear resistance. It can be used to make some parts and tools that need wear resistance.

Limitations of 1065 Carbon Steel

• Poor weldability: due to high carbon content. Easy to produce cracks when welding. Requires special welding techniques and preheating treatment. Increased processing difficulty and cost.
• Relatively poor cold workability: after quenching and tempering, the difficulty of cold working increases. Higher requirements for processing technology and equipment. However, the cold workability is better in the annealed state.
• Toughness and plasticity is low: compared with mild steel and so on. Its toughness and plasticity is relatively low. In some application scenarios that require high toughness and plasticity are limited.

Case Study

A rising agricultural machinery company selected 1065 carbon steel for a new harvester cutter disc, but trial production revealed grain coarsening that compromised mechanical performance. Hengke Metals swiftly responded—its General Manager initiated a technical conference with the client’s R&D lead, followed by the formation of a dedicated task force led by senior foundry engineers. By precisely controlling cooling rates across temperature zones, the team refined the grain structure, resulting in castings with greatly improved impact toughness that met all design requirements.

Throughout the project, Hengke maintained direct weekly communication with the client’s technical director, ensuring alignment with R&D goals. This close collaboration not only resolved the technical issue but also accelerated product development by nearly 20%, giving the client a critical advantage in market launch. The case demonstrates Hengke Metals’ strength in process optimization and its commitment to customer-focused engineering support.