C55 Carbon Steel: Properties, Composition, Applications & Suppliers in India

C55 carbon steel is a high-carbon, non-alloy steel grade used in the production of components requiring superior hardness, strength, and wear resistance. With a carbon content around 0.55%, this material falls into the higher range of carbon steels and is suitable for heat treatment processes like hardening and tempering. It’s widely used in the automotive, mechanical engineering, toolmaking, and forging industries.

In this blog, we’ll explore everything you need to know about C55 steel, from its chemical makeup and mechanical properties to its real-world applications and availability in India.

🔍 What is C55 Carbon Steel?

C55 is a high-carbon steel grade defined under the EN 10083-2 standard. It offers high surface hardness and good tensile strength after heat treatment, making it suitable for wear-resistant mechanical parts. It is also comparable to AISI 1055 and JIS S55C.

This grade is widely used in the manufacturing of tools, automotive parts, springs, and industrial machinery components.

🧪 Chemical Composition of C55 Carbon Steel

📌 High carbon content enhances strength and hardenability.

⚙️ Mechanical Properties of C55 Steel (Typical Values in Normalized Condition)

🔧 These properties can be significantly improved through quenching and tempering.

🔥 Heat Treatment of C55 Carbon Steel

C55 is highly responsive to various heat treatment processes, which enhance its mechanical performance.

• Annealing: Improves machinability and refines grain structure.

• Hardening: Performed at 820–860°C followed by oil or water quenching.

• Tempering: Carried out at 400–600°C to adjust hardness and toughness.

• Normalizing: Improves strength and ductility for machining applications.

⚠️ Pre-heating is recommended before welding due to high carbon content to avoid cracking.

🛠️ Key Features of C55 Carbon Steel

• High surface hardness after heat treatment

• Good wear resistance

• Suitable for flame and induction hardening

• Moderate machinability

• Limited weldability (requires pre- and post-heat treatment)

• Cost-effective alternative to alloy steels

🧰 Applications of C55 Carbon Steel

C55 steel is used in a wide variety of applications that demand strength and wear resistance:

• Gears and shafts

• Automobile components

• Crankshafts and axles

• Screwdrivers and tools

• Springs and spindles

• Forgings and heavy-duty fasteners

• Blades and cutting tools

🔩 It is commonly chosen for parts that experience repeated stress and friction.

🔁 C55 Carbon Steel Equivalent Grades

📦 Available Forms of C55 Steel

C55 carbon steel is readily available in various product forms such as:

• Hot Rolled Sheets and Plates

• Cold Drawn Bars

• Forged Bars

• Bright Bars

• Hexagonal Bars

• Flats and Blocks

💰 C55 Carbon Steel Price in India (Indicative)

📦 Prices vary based on size, surface finish, treatment, and quantity.

🧭 Top Suppliers of C55 Carbon Steel in India

Here are some of the most reputed C55 steel suppliers and stockists in India:

• Triton Alloys Inc., Mumbai

• SAIL (Steel Authority of India)

• Masteel India Pvt. Ltd.

• Jindal Steel & Power

• Bharat Steels

• Virwadia Steels

• Maharashtra Steel

✅ Ensure suppliers provide mill test certificates (MTC) and comply with ISO 9001 standards.

🏆 Why Choose C55 Carbon Steel?

• ✅ High hardness and wear resistance

• ✅ Cost-effective for heavy-duty components

• ✅ Easily heat-treated for custom strength

• ✅ Multiple forms and thicknesses available

• ✅ Supported by global and Indian standards

C55 is ideal for manufacturers looking for a reliable high-carbon steel suitable for tools, automotive, and mechanical engineering applications.

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🧾 Conclusion

C55 carbon steel is a dependable, cost-effective material for components where hardness and durability are key. It performs excellently under stress, making it a top choice for forged parts, tools, and wear-prone machine components. Thanks to its availability across India in multiple forms and sizes, C55 continues to be a vital material in modern engineering.

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