C-65 carbon steel

Introduction

We manufacture forging ingots, billets, and blooms in carbon steel specifically for C-65, designed for high strength and high wear resistance engineering applications. C-65 is a high carbon, unalloyed steel grade known for its excellent hardness, superior wear resistance, and good edge-holding capability after heat treatment. Due to its high carbon content, C-65 is ideally suited for applications where surface hardness and abrasion resistance are critical.

C-65 exhibits excellent response to quenching and tempering, resulting in high hardness levels. While its machinability is lower than medium carbon steels, it provides outstanding performance in wear-intensive and load-bearing components. C-65 is widely used in tooling, automotive, and general engineering applications where durability and long service life are required.

Chemical composition

Element Content (%) Function / effect
Carbon (c) 0.60 – 0.70 Provides very high hardness, strength, 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: 700 – 900 MPa
  • Yield strength: 450 – 650 MPa
  • Hardness: 250 – 300 hb (up to ~50–55 hrc after hardening)
  • Impact toughness: moderate
  • Wear resistance: very high

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

Heat treatment

  • annealing: performed to soften the steel and improve machinability prior to final machining.
  • normalizing: refines grain structure and improves structural uniformity.
  • quenching: heating to approximately 800 – 840°c followed by oil or water quenching to achieve very high hardness.
  • tempering: carried out at controlled temperatures to reduce brittleness and achieve the required balance between hardness and toughness.

Proper heat treatment is essential for C-65 to maximize hardness while controlling brittleness.

Key features and benefits

  • very high hardness and excellent wear resistance
  • excellent response to heat treatment
  • good edge retention properties
  • suitable for high-stress and abrasive applications
  • cost-effective high carbon steel solution
  • long service life in wear-intensive conditions

Typical applications

  • knives and cutting tools
  • industrial blades and shear tools
  • springs and high-strength strips
  • wear plates and liners
  • automotive and machine components
  • forged and heat-treated engineering parts

Equivalent steel grades

C-65 has several comparable grades across international standards, including:

  • EN9 / en 43 (bs standard)
  • c65 / 1.1221 (din / en 10083)
  • aisi 1065 (american standard)
  • is 1570 (part 2) – indian standard

Why choose C-65 for your application?

C-65 is the ideal choice for applications where high hardness, wear resistance, and durability are critical. Its high carbon content allows it to achieve very high hardness after heat treatment, making it suitable for cutting, wear, and high-stress components. When properly heat treated, C-65 delivers excellent performance and extended service life.

Comparison table for similar grades

Grade Carbon (%) Key applications Heat treatment Comments
C-65 0.60 – 0.70 Blades, springs, wear parts Quenching & tempering Very high hardness and wear resistance
C45 0.40 – 0.50 Shafts, gears Quenching & tempering Lower hardness than C-65
EN9 0.50 – 0.60 Tools and machine parts Q&t Medium-high carbon grade
Aisi 1065 0.62 – 0.70 Springs and cutting tools Q&t American equivalent

Summary

C-65 is a high carbon steel designed for demanding applications requiring superior hardness and wear resistance. With excellent heat treatment response and cost-effective performance, C-65 is a reliable material for tools, blades, springs, and high-wear engineering components.