C-50 carbon steel

Introduction

We manufacture forging ingots, billets, and blooms in carbon steel specifically for C-50, designed for medium to high strength engineering applications where good hardness and toughness are required. C-50 is a medium carbon, unalloyed engineering steel that offers a well-balanced combination of strength, hardness, and toughness. With lower carbon content than C-55 and C-65, C-50 provides better toughness and machinability while still delivering good hardness after heat treatment.

C-50 shows good response to quenching and tempering and is widely used in general engineering, automotive, and machinery applications where reliable mechanical performance and cost-effectiveness are required.

Chemical composition

Element	Content (%)	Function / effect
Carbon (c)	0.47 – 0.55	Provides good strength, hardness, and wear resistance
Manganese (mn)	0.60 – 0.90	Improves hardenability and toughness
Silicon (si)	0.15 – 0.35	Increases strength and acts as deoxidizer
Phosphorus (p)	Max 0.050	Impurity; limited to maintain toughness
Sulphur (s)	Max 0.050	Improves machinability when controlled
Chromium (cr)	Nil	Not intentionally added
Nickel (ni)	Nil	Not present
Molybdenum (mo)	Nil	Not present
Other elements	—	No significant alloying additions

Mechanical properties (typical – quenched & tempered)

• Tensile strength: 600 – 800 MPa
• Yield strength: 350 – 550 MPa
• Hardness: 220 – 270 hb (up to ~40–45 hrc after hardening)
• Impact toughness: good
• Wear resistance: moderate to good

( Mechanical properties may vary depending on section size, heat treatment, and service conditions)

Heat treatment

• annealing: used to soften the steel and improve machinability before final machining.
• normalizing: refines grain structure and improves uniformity of mechanical properties.
• quenching: heating to approximately 820 – 860°c followed by oil or water quenching to achieve required hardness.
• tempering: performed to reduce brittleness and adjust the required balance between strength and toughness.

Proper heat treatment ensures optimum performance of C-50 in engineering applications.

Key features and benefits

• good balance of strength and toughness
• good hardness after heat treatment
• better machinability than higher carbon grades
• suitable for forging and machining
• cost-effective and widely used carbon steel
• reliable and consistent performance

Typical applications

• shafts and axles
• gears and pinions
• automotive and machine components
• fasteners and general engineering parts
• forged and heat-treated components

Equivalent steel grades

C-50 has several equivalent and comparable grades, including:

• EN8 /  EN9 (bs standard)
• c50 / 1.0540 (din / en 10083)
• aisi 1050 (american standard)
• is 1570 (part 2) – indian standard

Why choose C-50 for your application?

C-50 offers a practical combination of strength, toughness, and machinability, making it suitable for a wide range of engineering applications. Its good response to heat treatment and cost-effective nature help deliver reliable performance without unnecessary material cost.

Comparison table for similar grades

Grade	Carbon (%)	Key applications	Heat treatment	Comments
C-50	0.47 – 0.55	Shafts, gears, machine parts	Quenching & tempering	Good balance of strength and toughness
C45	0.40 – 0.50	General engineering parts	Q&t	Lower hardness than C-50
C55	0.50 – 0.60	Gears and springs	Q&t	Higher hardness, lower toughness
Aisi 1050	0.48 – 0.55	Automotive & machinery parts	Q&t	American equivalent

Summary

C-50 is a medium carbon steel designed for applications requiring good strength and toughness with moderate wear resistance. With reliable Mechanical properties and economical pricing, C-50 remains a popular choice for general engineering and automotive components.