C75S – 1.1248

Water-Quenched Spring Steel

C75S – 1.1248 / Ck75 / C75RR / CS80

C75S – 1.1248 steel grade belongs to the group of high-carbon structural steels and is commonly used in applications requiring high hardness, durability, and elasticity. Although it is identified by different standard names in various countries, its fundamental properties are largely similar. For example, this steel is known as Ck75 in Germany, C75S in certain European standards, C75RR in France, and CS80 in the United Kingdom. These alternative designations indicate the wide acceptance and usage of this steel in international engineering and manufacturing applications.

C75S steel typically contains approximately 0.70% – 0.80% carbon. This relatively high carbon content significantly improves the hardenability of the steel. When appropriate heat treatment processes are applied, the material can achieve high hardness, good wear resistance, and strong mechanical strength. For this reason, it is frequently used in the production of springs and components requiring elastic properties.

This steel responds very well to hardening and tempering treatments. The hardening process increases the overall hardness of the structure, while tempering reduces brittleness and provides a more balanced mechanical performance. As a result, it is possible to produce components that are both strong and sufficiently elastic. This characteristic is particularly important for parts subjected to continuous loads or repetitive mechanical movements.

C75S steel is generally produced in sheet, strip, or plate form and is widely recognized among spring steel grades. When used in thin sections, it provides excellent elasticity and spring-back characteristics, making it suitable for both mechanical systems and precision equipment.

Due to its high carbon content, the machinability of C75S steel is more limited compared to low-carbon steels. However, with proper machining techniques it can still be processed through turning, grinding, and other metalworking operations. The combination of strength, hardness, and elasticity makes C75S – 1.1248 steel a reliable solution for many engineering applications.

Main Application Areas

• Spring manufacturing (coil springs, leaf springs, and strip springs)
• Spring steel sheets and strip materials
• Certain parts of knives and cutting tools
• Spring-loaded components used in locking mechanisms
• Elastic metal components in agricultural machinery
• Various spring and elastic elements in the automotive industry
• Measuring instruments and precision mechanical systems
• Wear-resistant machine components
• Various hand tools and durable metal parts

Thanks to these characteristics, C75S – 1.1248 and equivalent steel grades are widely used as important engineering materials in industrial applications requiring high hardness, strength, and elasticity.

General Identity

C75S – 1.1248

Equivalent Grades

C75S – 1.1248

Standards

C75S – 1.1248

Chemical Composition

C75S – 1.1248

Mechanical Properties

C75S – 1.1248