ThePipingMart Blog Grades S25C Steel – Composition, Properties and Uses

S25C Steel – Composition, Properties and Uses

S25C Steel

If you are searching for high-quality steel that is versatile and suitable for various applications, then S25C steel is worth checking out. It is low-carbon steel with impressive properties, making it a perfect choice for manufacturing operations across different industries. This blog post will give you a comprehensive understanding of S25C steel.

S25C Steel Composition

The chemical composition of S25C consists of carbon(C): 0.22-0.28%, silicon(Si): 0.15-0.35%, manganese (Mn): 0.3-0.6%, phosphorus (P): 0.030% max, sulfur (S): 0.035% max, and iron (Fe): balance. Its low carbon content makes it easy to work with, and it can undergo different fabrication processes.

S25C Steel Physical Properties

S25C steel has a density of about 7.85 g/cm³, a melting point of 1427°C, and a thermal expansion coefficient of 11.7 x 10^-6 k^-1. It has an electrical conductivity of 19-20% IACS and a thermal conductivity of 48.6 W/m-°C. Its specific heat capacity is 477 J/kg°C.

S25C Steel Mechanical Properties

S25C steel has an ultimate tensile strength of 510 – 690 MPa and a yield strength of 245 MPa. It has a low percentage of elongation, which is 15%. The steel is also known for its good machinability, which allows for efficient drilling, cutting, and turning.

S25C Steel Uses

One of the significant benefits of S25C steel is its versatility, which makes it suitable for various applications. Its high-quality mechanical properties make it a perfect choice for manufacturing machinery parts, such as gears, sprockets, and bearings. S25C steel is also widely used in construction, automotive, and general engineering.

S25C Steel Hardness

S25C steel has a hardness rating of approximately 160 to 200 HB. This moderate hardness level allows the steel to be machined easily while retaining adequate durability and strength.

S25C Steel Heat Treatment

S25C steel can undergo heat treatments such as annealing, normalizing, hardening, and tempering to improve its mechanical properties. This makes the steel more durable, challenging, and ductile. The heat treatment involves exposing the steel to high temperatures and then rapidly cooling the steel to achieve the desired properties.

S25C Steel Welding

S25C steel is easy to weld using different welding methods such as Gas Tungsten Arc Welding (GTAW), Gas Metal Arc Welding (GMAW), and Shielded Metal Arc Welding (SMAW). However, ensuring the steel is clean and free from contaminants before welding is essential to reduce the risk of porosity and cracking.

S25C Steel Corrosion Resistant

S25C steel is not corrosion-resistant. As such, when it is exposed to moisture, air, or other environmental elements, it is likely to corrode. To address this, it is necessary to apply appropriate measures such as surface coatings and rust inhibitors.


In conclusion, S25C steel is an excellent choice for manufacturers seeking high-quality steel that is easy to work with and suitable for various applications. Its low carbon content, good mechanical properties, and superb machinability make it a versatile steel perfect for fabricating machinery parts. However, it is essential to note that S25C steel is not corrosion resistant, but with proper measures, it can perform at its best without the risk of decay.

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