C50 carbon steel

Introduction

We manufacture forging ingots, billets, and blooms in carbon steel specifically for C50, designed for medium to high strength engineering applications where good hardness and toughness are required. C50 is a medium carbon, unalloyed engineering steel that offers a well-balanced combination of strength, hardness, and toughness. With lower carbon content than C55 and C65, C50 provides better toughness and machinability while still delivering good hardness after heat treatment.

C50 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

(Properties may vary depending on section size and heat treatment conditions)

  • 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

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 C50 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

C50 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 C50 for your application?

C50 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
C50 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 C50
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

C50 is a medium carbon steel designed for applications requiring good strength and toughness with moderate wear resistance. With reliable Mechanical properties and economical pricing, C50 remains a popular choice for general engineering and automotive components.