C55Mn75 Carbon Steel: Composition, Properties, Applications & Trusted Suppliers in India
C55Mn75 carbon steel is a high-carbon manganese steel known for its enhanced hardness, tensile strength, and wear resistance. This steel grade, often used in forged components, automotive parts, and heavy machinery, combines the strength of carbon with the hardenability effects of manganese (Mn). If you’re sourcing materials for high-stress or wear-prone applications, C55Mn75 steel offers exceptional performance at a competitive cost.
In this blog, we’ll dive into the chemical and mechanical properties, heat treatment details, applications, and equivalent grades of C55Mn75 steel. We’ll also explore its pricing and the top suppliers in India.
🔍 What is C55Mn75 Carbon Steel?
C55Mn75 is a high-carbon steel with about 0.55% carbon and approximately 0.75% manganese, making it harder and more wear-resistant than standard carbon steels. The added manganese content increases strength, toughness, and responsiveness to heat treatment, while still maintaining machinability with proper tools.
This steel grade is used in applications where a strong, tough, and wear-resistant material is required, especially after quenching and tempering.
🧪 C55Mn75 Carbon Steel Chemical Composition
| Element | Typical Content (%) |
|---|---|
| Carbon (C) | 0.52 – 0.60 |
| Manganese (Mn) | 0.70 – 0.90 |
| Silicon (Si) | ≤ 0.40 |
| Sulfur (S) | ≤ 0.035 |
| Phosphorus (P) | ≤ 0.035 |
| Iron (Fe) | Balance |
🧲 The higher Mn content enhances hardenability and tensile strength.
⚙️ Mechanical Properties of C55Mn75 Carbon Steel (Normalized Condition)
| Property | Value |
|---|---|
| Tensile Strength | 700 – 850 MPa |
| Yield Strength | ~400 – 500 MPa |
| Elongation | 10 – 14% |
| Brinell Hardness | 200 – 240 HB |
| Impact Toughness | ≥ 25 J |
🔧 Mechanical properties are significantly improved by quenching and tempering.
🔥 Heat Treatment of C55Mn75 Carbon Steel
C55Mn75 responds well to heat treatment, particularly hardening and tempering, to boost wear resistance and mechanical strength.
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Normalizing: 850–880°C (air cooled)
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Hardening: 820–860°C (oil or water quenching)
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Tempering: 450–650°C (adjusts hardness/toughness)
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Annealing: 650–700°C (improves machinability)
⚠️ Due to high carbon content, preheating before welding is essential to reduce the risk of cracking.
🛠️ Key Features of C55Mn75 Carbon Steel
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High tensile and yield strength
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Excellent wear and abrasion resistance
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Enhanced hardenability from manganese
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Suitable for forging and machining
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Acceptable weldability with proper procedure
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Cost-effective for performance-critical components
🧰 Applications of C55Mn75 Carbon Steel
C55Mn75 is suitable for manufacturing components subject to high stress, fatigue, and surface wear, including:
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Crankshafts and Camshafts
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Gear wheels and pinions
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Sprockets and axles
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Connecting rods
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Agricultural tools and machinery
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Forged bolts, studs, and fasteners
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Spring-loaded and mechanical components
🔩 Used extensively in the automotive, agricultural, and general engineering industries.
🔁 Equivalent Grades of C55Mn75 Carbon Steel
| Standard | Equivalent Grade |
|---|---|
| DIN / EN 10083 | C55Mn75 |
| AISI / SAE | Approx. 1055 w/ Mn boost |
| IS (India) | IS 1570: Class 3 C55Mn75 |
| JIS (Japan) | Close to S55C w/ higher Mn |
| BS (UK) | Similar to 070M55 |
📌 Exact equivalents may differ slightly due to manganese content variation.
📦 Available Forms of C55Mn75 Carbon Steel
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Hot Rolled Plates
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Forged Bars and Flats
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Bright Drawn Bars
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Rounds, Hex, and Square Bars
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Billets and Custom Cut Pieces
📐 Available in black, bright, rough turned, peeled, and ground finishes.
💰 C55Mn75 Carbon Steel Price in India (Indicative)
| Product Type | Price Range (INR/kg) |
|---|---|
| C55Mn75 Hot Rolled Plate | ₹75 – ₹95 |
| C55Mn75 Forged Bars | ₹85 – ₹110 |
| C55Mn75 Bright Bars | ₹95 – ₹120 |
💡 Prices may vary based on size, treatment, surface finish, and quantity.
🧭 Top C55Mn75 Carbon Steel Suppliers in India
Reliable, ISO-certified suppliers of C55Mn75 steel in India include:
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Triton Alloys Inc., Mumbai
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Masteel India Pvt. Ltd., Maharashtra
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Virwadia Steels, Chennai
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SAIL (Steel Authority of India)
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Bhansali Inc.
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Jindal Steel & Power
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Maharashtra Steel Rolling Mills
✅ Look for suppliers offering mill test certificates (MTC) and third-party inspections.
🏆 Why Choose C55Mn75 Carbon Steel?
C55Mn75 is ideal when your project demands:
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High tensile and yield strength
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Increased resistance to wear and fatigue
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Hardenability without costly alloying elements
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Heat-treatable performance at economical rates
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Consistent quality and wide availability in India
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✅ Conclusion
C55Mn75 carbon steel is a durable, high-strength material perfectly suited for industries where reliability under pressure, impact, and wear are crucial. It offers an affordable balance between performance and machinability, making it a go-to steel grade for automotive, forging, and engineering components. With a strong supply network in India, sourcing this grade is both easy and cost-effective.
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