Steel gradesC10, C15, C22, C...C50, C50E, 1.054...

C50, 1.0540, C50E, 1.1206 - carbon steel

C50, 1.0540, C50E, 1.1206, AISI 1050 - carbon structural steel acc. to EN 10083-2.

Standard Grade
Chemical composition %
C: Si: Mn: P: S: Cr: Mo: Ni:
EN C50 / 1.0540
0.47-0.55 0.17-0.37 0.42-0.50 <0.03 <0.035 <0.4 <0.1 <0.4
EN C50E / 1.1206
0.47-0.55 <0.4 0.6-0.9 <0.03 <0.035 <0.4 <0.1 <0.4
NF XC50
0.46-0.52 0.15-0.35 0.5-0.8 <0.035 <0.025 - - -
DIN Ck53 / 1.1210
0.50-0.57 <0.4 0.6-0.9 <0.035 <0.035 - - -
BS 080M50
0.45-0.55 0.1-0.4 0.6-1.0 <0.05 <0.015-0.050 - - -
JIS S50C
0.47-0.53 0.15-0.35 0.6-0.9 <0.03 <0.035 <0.2 - <0.2
STAS OLC50X
0.47-0.55 0.17-0.37 0.6-0.9 <0.035 <0.035 - - -
ASTM AISI 1050 / UNS G10500
0.48-0.55 - 0.6-0.9 <0.04 <0.05 - - -

C50, 1.0540, C50E, 1.1206 - description

Non-alloy toughening machine steel, strong and sufficiently ductile, used in both normalized and toughened condition, as well as case-hardened condition, for wear-resistant machine parts (gears, rollers, shafts, axles, rims, wheels).

In soft annealed condition it is machinable and in normalized and soft annealed condition - shearable.

Physical and mechanical properties

  • General properties:
    • In induction hardened condition (+QT): > 56 HRC
    • In improved shearability condition (+S): < 255 HBW
    • In soft annealed condition (+A): < 217 HBW
  • Mechanical properties of bars in normalized condition (+N):
    • Diameter: <16 mm
      • Tensile strength Rm: > 650 MPa
      • Yield strength Re: > 355 MPa
      • Elongation A: > 13 %
    • Diameter: 16-100 mm
      • Rm: > 610 MPa
      • Re: > 320 MPa
      • A: > 14 %
    • Diameter: > 100 mm
      • Rm: > 590 MPa
      • Re: > 290 MPa
      • A: > 14 %
  • Mechanical properties of bars in toughened condition (+QT):
    • Diameter: <16 mm
      • Rm: 750-900 MPa
      • Re: > 520 MPa
      • A: > 13 %
      • Percent reduction of area Z: > 30 %
    • Thickness: 16-40 mm
      • Rm: 700-850 MPa
      • Re: > 460 MPa
      • A: > 15 %
      • Percent reduction of area Z: > 35 %
    • Thickness: > 40 mm
      • Rm: 650-800 MPa
      • Re: > 400 MPa
      • A: > 16 %
      • Percent reduction of area Z: > 40 %
  • Mechanical properties of flat products in toughened condition (+QT):
    • Thickness: <8 mm
      • Rm: 750-900 MPa
      • Re: > 520 MPa
      • A: > 13 %
      • Percent reduction of area Z: > 30 %
    • Thickness: 8-20 mm
      • Rm: 700-850 MPa
      • Re: > 460 MPa
      • A: > 15 %
      • Percent reduction of area Z: > 35 %
    • Thickness: > 20 mm
      • Rm: 650-800 MPa
      • Re: > 400 MPa
      • A: > 16 %
      • Percent reduction of area Z: > 40 %

Heat treatment and working

Recommended working and heat treatment parameters for C50E alloy:

  • Forging and rolling: 1050-800 °C
  • Quenching: 810-850 °C
  • Tempering: 550-660 °C
  • Normalizing annealing: 830-870 °C
  • Soft annealing: 650-700 °C

We deliver this steel alloy as:

  • Bars
  • Forgings
  • Coldrolled Strips

Replacements, equivalents and other designations:

C50E, AISI 1050, UNS G10500, OLC 50X, SM 53C, S50C, 080M50, Ck53, Ck50, Cf53, XC50, C50R, C50, 50, C50E, 1.0540, 1.1206, 1.1241, 1.1210, 2C50, C5-C5F, C5

See our offer