C55, 1.0535, C60, 1.0601, AISI 1050, AISI 1060

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

Table of content:

Standards and chemical composition
Description
Physical and mechanical properties
Heat treatment

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 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

C55, 1.0535, C60, 1.0601 - carbon steel