C55, 1.0535, C60, 1.0601 - carbon steel

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Standards and chemical composition Specification Properties Treatment Replacements

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
PN	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
EN	0.52-0.60	<0.4	0.6-0.9	<0.045	<0.045	<0.4	<0.1	<0.4
EN	C55E / 1.1203
EN	0.52-0.60	<0.4	0.6-0.9	<0.03	<0.035	<0.4	<0.1	<0.4
EN	C55R / 1.1209
EN	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
DIN	0.50-0.57	0.15-0.35	0.4-0.7	<0.025	<0.035	-	-	-
ASTM	AISI 1055 / UNS G10550
ASTM	0.5-0.6	-	0.6-0.9	<0.04	<0.05	-	-	-
PN	60
PN	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
EN	0.57-0.65	<0.4	0.6-0.9	<0.045	<0.045	<0.4	<0.1	<0.4
EN	C60E / 1.1221
EN	0.57-0.65	<0.4	0.6-0.9	<0.03	<0.035	<0.4	<0.1	<0.4
EN	C60R / 1.1223
EN	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
ASTM	0.55-0.65	-	0.6-0.9	<0.04	<0.05	-	-	-

C55 / C60 - description and characteristic

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

Substitutes, equivalents and other species designations

C55E

C55

XC55

Cf53

070M55

OLC55X

AISI 1055

UNS G10550

AISI 1060

UNS G10600

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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