Project Description

C45 steel is an unalloyed medium carbon engineering steel which has 0.42%-0.5% Carbon.It offers moderate tensile strengths,wear resistance and good machinability.this material is capable of through hardening by quenching and tempering on limited sections,and also can be flame or induction hardened to surface hardness Min 55HRC.C45 is generally supplied in an untreated or normalised condition with a typical tensile strength range 570 – 700 Mpa and Brinell hardness range 170 – 210.

C45 forged square bar

1.Supply Form & Size & Tolerance

Hot rolled bar:Φ6-Φ130mm,Length:3000-10000mm

Hot Forged round bar:Φ130-Φ1000mm,Length:3000-10000mm

Flat bar/Blcoks:Thickness :120-800mm xWidth:120-1500mm,Length:2000-6000mm

Surface FinishBlack-Forged Black-Rolled Turned   GrindingPolishedPeeledCold Drawn
Tolerance(0,+5mm)(0,+1mm)(0,+3mm)Best h9Best h11Best H11Best H11

2.Chemical Composition

C45/1.05030.42-0.500.50-0.80≤ 0.045≤ 0.045≤ 0.4≤ 0.4≤ 0.1≤ 0.4≤ 0.63
C45E/1.11910.42-0.500.50-0.80≤ 0.03≤ 0.035≤ 0.4≤ 0.4≤ 0.1≤ 0.4≤ 0.63
C45R/1.12010.42-0.500.50-0.80≤ 0.030.02-0.04≤ 0.4≤ 0.4≤ 0.1≤ 0.4≤ 0.63

3.Relevant Standards


4. Mechanical Property

Mechanical properties a at room temperature in the quenched and tempered condition (+QT)
Diameter d mm≤ 1616-4040-100
Thickness t mm< 88-2020-60
Yield Strength Mpa≥490≥430≥370
Tensile Strength Mpa700-850650-800630-780
Elongation, %≥14≥16≥17
Reduction of area ,%≥35≥40≥45
Mechanical properties a at room temperature in the normalized condition (+N)
Diameter d mm≤ 1616-100100-250
Thickness t mm≤ 1616-100100-160
Yield Strength Mpa≥340≥305≥275
Tensile Strength Mpa≥620≥580≥560
Elongation, %≥14≥16≥16


C45 steel forging temperature:900 – 1100°C ,cooling as slowly as possible in still air or in sand after forged.

6.Heat Treatment

  • Normalizing:  840 – 900°C,Cooling in air
  • Soft Annealing:680 – 710°C,Cooling in furnace
  • Stress relieve:550-650°C,Cooling in air
  • Oil Quenching:840 – 870°C
  • Water Quenching:820 – 850°C
  • Tempering:540 – 680°C,Cooling in air
  • Induction or Flame hardening:870-900°C

7.Surface Hardness

  • Natural (untreated) (+U):172-242HB
  • Treated to improve shearability (+S):Max 255HB
  • Soft annealed (+A):Max 207HB
  • Flame or induction hardening:Min 55HRC
NORMAL HARDENABILITY +H (850°C - hardness HRC – distance mm)
HRC - mm12345678910111315


C45 is widely used in many industries which require more strength,hardness and wear resistance.Typical applications include tools, shafts, nuts, bolts, connecting rods, screws, rollers,axles, spindles, studs, knives and many automotive and general engineering components

Get a Quote