C15E, CK15, 1.1141, C15, 15 - carbon steel acc. to ISO 683-3, PN-H-84019, GOST 1050.

Standard Grade
Chemical composition %
C: Si: Mn: P: S:
PN 15
0.12-0.19 0.15-0.40 0.35-0.65 <0.04 <0.04
GOST 15
0.12-0.19 0.17-0.37 0.35-0.55 <0.03 <0.035
DIN/EN C15E / Ck15 / 1.1141
0.12-0.18 <0.4 0.3-0.6 <0.035 <0.035
EN C15R / 1.0401
0.12-0.18 <0.4 0.3-0.6 <0.035 0.02-0.04
NF XC15
0.12-0.18 <0.35 0.3-0.7 <0.04 <0.035
STAS OLC15
0.12-0.18 0.17-0.37 0.35-0.65 <0.04 <0.045
BS 080A15
0.13-0.18 - 0.7-0.9 <0.035 <0.035
BS 080M15
0.12-0.18 - 0.6-1.0 <0.035 0.02-0.04
ASTM AISI 1015 / UNS G10150
0.13-0.18 - 0.3-0.6 <0.04 <0.05

C15E, CK15, 1.1141, C15, gat. 15 - description

Common unalloyed steel for carburizing and hardening. A bit stronger than C10E and a bit weaker than C20E.

In carburized and quenched condition it is used for light-duty parts like pivots, axles, shafts, levers, pins, bolts, nuts.

In normalized condition it is used mainly for fasteners.


Physical and mechanical properties

  • General properties according to ISO 683-3:
    • In delivery condition (+A): <143 HB
    • In normalised condition (+N): 95-150 HB
  • Bright bars in soft annealed and cold drawn condition +A,+C:
    • Diameters: 5-10 mm - <238 HBW
    • Diameters: 10-16 mm - <231 HBW
    • Diameters: 16-40 mm - <216 HBW
    • Diameters: 40-63 mm - <198 HBW
    • Diameters: 63-100 mm - <178 HBW
  • Bright bars in cold drawn condition +C:
    • Diameters: 5-10 mm
      • Tensile strength Rm: 500-800 MPa
      • Yield strength Re: >380 MPa
      • Elongation A: >7 %
    • Diameters: 10-16 mm
      • Rm: 480-780 MPa
      • Re: >480 MPa
      • A: >8 %
    • Diameters: 16-40 mm
      • Rm: 430-730 MPa
      • Re: >280 MPa
      • A: >9 %
    • Diameters: 40-63 mm
      • Rm: 380-670 MPa
      • Re: >240 MPa
      • A: >9 %
    • Diameters: 63-100 mm
      • Rm: 340-600 MPa
      • Re: >215 MPa
      • A: >12 %
  • Bright bars:
    • in rolled and peeled condition (+SH): 98-178 HBW
    • in soft annealed and peeled condition (+A+SH): <131 HBW
  • Steel strip in cold-rolled condition +CR:
    • Rm: <870 MPa
    • <260 HV
  • Steel strip in soft annealed and cold-drawn condition +A; +LC:
    • Rm: <450 MPa
    • HV: <140

Heat treatment and working

Recommended working and heat treatment parameters for C15E alloy:

  • Soft annealing: 650-700 °C
  • Normalising: 890-920 °C

We deliver this steel alloy as:

  • Colddraw, hot-rolled and forged bars
  • Sheets and plates

Replacements, equivalents and other designations:

C15E, 15, 2C15, 3C15, C15D, C15D2, C15R, C16E, C16R, XC12, XC15, XC18, Ck15, 080A15, 080M15, CE15E4, SHC15, SM15C, OLC15, AISI 1015, UNS G10150, 505, 1.1141, 1141.0 BOHLER G, BGH 1141, Buderus Ck15, CARBODUR C15E, Ck15k, DIRO-Ck 15, Eschmann Ck 15, Klockner Ck 15, TS Ck 15, Almenit 1141, BOHLER E920, C15E, DE1141, EW Ck15, IS1141, OVAKO 017A, UHB Ck15