CK45 Carbon Steel: Composition, Properties, Applications & Leading Suppliers in India

CK45 carbon steel is a widely used medium-carbon, non-alloy steel grade that offers excellent toughness, strength, and wear resistance. With its balanced carbon and manganese content, CK45 is extensively used in engineering, automotive, and machinery manufacturing—especially where moderate strength and good machinability are required.

This blog provides a complete guide to CK45 carbon steel, including its chemical composition, mechanical properties, equivalent grades, heat treatment, and leading suppliers in India.

🔍 What is CK45 Carbon Steel?

CK45 is a medium carbon steel (approximately 0.45% carbon) categorized under the DIN 17200 / EN 10083-2 standard. It offers a good balance of ductility, tensile strength, and machinability, making it suitable for applications that require moderate mechanical performance and good formability.

Due to its carbon content, CK45 can be hardened through heat treatment, making it a versatile material in automotive, tool-making, and general engineering applications.

🧪 Chemical Composition of CK45 Carbon Steel

🔍 The medium carbon and moderate manganese contents allow CK45 to be both strong and machinable.

⚙️ Mechanical Properties of CK45 (Typical in Normalized Condition)

💡 Properties can be significantly enhanced through quenching and tempering.

🔥 Heat Treatment of CK45 Carbon Steel

CK45 is well-suited to all major heat treatment processes:

• Normalizing: 840–880°C (air cooled)

• Hardening: 820–860°C followed by oil quenching

• Tempering: 500–650°C (to adjust strength vs. toughness)

• Annealing: 650–700°C (improves machinability)

⚠️ Weldability is limited—preheat and post-weld heat treatment are recommended for critical structures.

🛠️ Key Features of CK45 Steel

• ✔️ Medium tensile and yield strength

• ✔️ High surface hardness (after heat treatment)

• ✔️ Excellent machinability

• ✔️ Good wear resistance

• ✔️ Moderate toughness

• ✔️ Cost-effective engineering steel

🧰 Applications of CK45 Carbon Steel

CK45 is used in a wide range of engineering and industrial applications:

• 🚗 Automotive Components (axles, shafts, piston rods)

• ⚙️ Gear Wheels and Couplings

• 🧰 Tool Holders and Dies

• 🛠 Hydraulic Cylinders and Sleeves

• 🔧 Machine Tool Spindles

• 🛞 Bolts, Screws, and Pins

• 🧪 Forgings and Engineering Components

💡 Preferred for parts requiring a balance of hardness and machinability.

🔁 Equivalent Grades of CK45 Carbon Steel

📌 SAE 1045 is the most commonly recognized international equivalent.

📦 Available Forms of CK45 Carbon Steel

CK45 is supplied in various product forms and finishes:

• Hot Rolled Plates and Sheets

• Forged Round Bars

• Bright Drawn Bars

• Hex, Flat, and Square Bars

• Billets and Cut-to-Length Pieces

🧽 Surface finishes include black, bright, turned, ground, and peeled.

💰 CK45 Carbon Steel Price in India (Indicative)

📌 Prices vary depending on size, quantity, surface finish, and heat treatment.

🧭 Top Suppliers of CK45 Carbon Steel in India

Here are some trusted, ISO-certified stockists and suppliers:

• Triton Alloys Inc., Mumbai

• SAIL – Steel Authority of India Ltd.

• Masteel India Pvt. Ltd., Maharashtra

• Virwadia Steels, Chennai

• Jindal Steel & Power

• Bhansali Inc., Gujarat

✅ Always request Mill Test Certificates (MTC) and Third-Party Inspection (TPI) reports for quality assurance.

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✅ Conclusion

CK45 carbon steel is a robust and versatile medium carbon steel grade that combines good mechanical strength with decent machinability. It is widely used for shafts, gears, pins, forgings, and machine components—especially when heat treatment is applied for enhanced hardness and performance. With international equivalents like SAE 1045 and JIS S45C, CK45 is readily available and trusted across a wide range of engineering applications.

Whether you’re sourcing hot rolled bars, precision-machined components, or custom-cut billets, CK45 offers a reliable and cost-effective material solution for industrial needs.

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