Steel gradesC10, C15, C22, C...C55, 1.0535, C60...

C55, 1.0535, C60, 1.0601 - carbon steel

C55 / 1.0535, C60 / 1.0601, AISI 1050, AISI 1060 - Structural carbon steel acc. to EN 10083-2.

Standard Grade
Chemical composition %
C: Si: Mn: P: S: Cr: Mo: Ni:
PN 55
0.52-0.60 0.1-0.4 0.6-0.9 <0.04 <0.04 <0.4 <0.1 <0.4
EN C55 / 1.0535
0.52-0.60 <0.4 0.6-0.9 <0.045 <0.045 <0.4 <0.1 <0.4
EN C55E / 1.1203
0.52-0.60 <0.4 0.6-0.9 <0.03 <0.035 <0.4 <0.1 <0.4
EN C55R / 1.1209
0.52-0.60 <0.4 0.6-0.9 <0.03 0.02-0.04 <0.4 <0.1 <0.4
DIN Cf53 / 1.1206
0.50-0.57 0.15-0.35 0.4-0.7 <0.025 <0.035 - - -
ASTM AISI 1055 / UNS G10550
0.5-0.6 - 0.6-0.9 <0.04 <0.05 - - -
PN 60
0.57-0.65 0.1-0.4 0.6-0.9 <0.04 <0.04 <0.3 <0.1 <0.3
EN C60 / 1.0601
0.57-0.65 <0.4 0.6-0.9 <0.045 <0.045 <0.4 <0.1 <0.4
EN C60E / 1.1221
0.57-0.65 <0.4 0.6-0.9 <0.03 <0.035 <0.4 <0.1 <0.4
EN C60R / 1.1223
0.57-0.65 <0.4 0.6-0.9 <0.03 0.02-0.04 <0.4 <0.1 <0.4
ASTM AISI 1060 / UNS G10600
0.55-0.65 - 0.6-0.9 <0.04 <0.05 - - -

C55 / C60 - description and characteristics

C55 and C60 steels are used in either normalized, toughened or case-hardened condition. They are strong and sufficiently ductile, with C60 having slightly better strength than C55.

They are used to produce load and wear-resistant machine parts (spindles, gears, axles, rollers), basic springs and hand tools (axes, hammers, wrenches).

Physical and mechanical properties

  • General properties:
    • Induction hardened: >56 HRC
    • When treated to improve shearability (+S): < 255 HBW
    • In soft annealed condition (+A): <217 HBW (C55) / < 241 HBW (C60)
  • Mechanical properties of round bars in normalized condition (+N):
    • Diameter: <16 mm
      • Rm: >650 MPa (C55) / >710 MPa (C60)
      • Re: >355 MPa (C55) / >380 MPa (C60)
      • A: >13% (C55) / >10% (C60)
    • Diameter: 16-100 mm
      • Rm: >610 MPa (C55) / >670 MPa (C60)
      • Re: >320 MPa (C55 / >340 MPa (C60)
      • A: >14% (C55) / >11% (C60)
    • Diameter: > 100 mm
      • Rm: > 590 MPa (C55) / >650 MPa (C60)
      • Re: > 290 MPa (C55) / >310 MPa (C60)
      • A: > 14% (C55) / >11% (C60)
  • Mechanical properties of round bars in hardened condition (+QT):
    • Diameter: <16 mm
      • Rm: 750-900 MPa (C55) / 850-1000 MPa (C60)
      • Re: > 520 MPa (C55) / >580 MPa (C60)
      • A: > 13 % (C55) / >11% (C60)
      • Z: > 30 % (C55) / >25% (C60)
    • Diameter: 16-40 mm
      • Rm: 700-850 MPa (C55) / 750-900 (C60)
      • Re: > 460 MPa (C55) / 490 (C60)
      • A: > 15 % (C55) / >14% (C60)
      • Z: > 35 % (C55) / >35% (C60)
    • Diameter: > 40 mm
      • Rm: 650-800 MPa (C55) / 700-850 (C60)
      • Re: > 400 MPa (C55) / >420 MPa (C60)
      • A: > 16 % (C55) / >15% (C60)
      • Z: > 40 % (C55) / >40% (C60)
  • Mechanical properties of flat products in quenched and tempered condition (+QT):
    • Thickness: < 8 mm
      • Rm: 750-900 MPa (C55) / >850-1000 MPa (C60)
      • Re: > 520 MPa (C55) / >580 MPa (C60)
      • A: > 13 % (C55) / >13% (C60)
      • Z: > 30 % (C55) / >25% (C60)
    • Thickness: 8-20 mm
      • Rm: 700-850 MPa (C55) / 750-900 MPa (C60)
      • Re: > 460 MPa (C55) / >490 MPa (C60)
      • A: > 15 % (C55) / >14% (C60)
      • Z: > 35 % (C55) / >35% (C60)
    • Thickness: > 20 mm
      • Rm: 650-800 MPa (C55) / 700-850 MPa (C60)
      • Re: > 400 MPa (C55) / >420 MPa (D60)
      • A: > 16 % (C55) / > 15% (C60)
      • Z: > 40 % (C55 / >40% (C60)

Heat treatment and working

Recommended working and heat treatment parameters for C55E alloy:

  • Forging and rolling: 1050-800 °C
  • Quenching: 805-845 °C
  • Tempering: 550-660 °C
  • Normalizing annealing: 825-865 °C
  • Soft annealing: 650-700 °C

We deliver this steel alloy as:

  • Bars
  • Forgings
  • Sheets

Replacements, equivalents and other designations:

C55E, C55, XC55, Cf53, 070M55, 55, OLC55X, AISI 1055, UNS G10550, AISI 1060, UNS G10600, 60, Ck60, XC60, C60R, C60, C60E, 1.1206, 2C60, 1.1221, 1.0535, 1.1203, 1.1209, 1.1206, 1.0601, 1.1223

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