C67S, 1.1231, XC68, AISI 1065 - Carbon low-alloy spring steel for oil hardening for lightweight springs according to EN 10132-4.

 

Standards Steel Grades
Chemical Composition %
C: Mn: Si: P: S: Cr: Mo: Ni: Cu:
EN / DIN C67S - 1.1231 - Ck 67 - Ck67
0.65 - 0.73 0.60 - 0.90 0.15 - 0.35 <0.025 <0.025 <0.40 <0.10 <0.40 -
DIN Ck68 - Ck 68 - C68E - 1.1234 - C 68 E WW
0.60 - 0.75 <0.70 0.20 - 0.45 <0.025 <0.025 - - - -
PN grade 65
0.62 - 0.70 0.50 - 0.80 0.10 - 0.40 <0.04 <0.040 <0.30 <0.10 <0.30 <0.30
ISO CS65 - CS 65
0.59 - 0.70 0.60 - 0.90 0.10 - 0.35 <0.035 <0.030 - - - -
JIS S65CM - S 65 CM
0.60 - 0.70 0.60 - 0.90 0.15 - 0.35 <0.030 <0.035 <0.20 - <0.20 <0.30
AFNOR XC68 - XC 68
0.65 - 0.73 0.40 - 0.70 0.15 - 0.35 <0.035 <0.025 - - - -
DIN C 67 - C67 - 1.0603
0.65 - 0.72 0.60 - 0.90 0.15 - 0.35 <0.045 <0.045 - - - -
GOST 65
0.62 - 0.70 0.30 - 0.70 0.17 - 0.37 <0.035 <0.035 <0.15 - <0.15 <0.20
EN 2CS67 - 2 CS 67 - 1.1231
0.65 - 0.72 0.60 - 0.90 0.15 - 0.40 <0.035 <0.035 - - - -
DIN 70Cr2 - 70 Cr 2 - 1.2007 - 2007
0.65 - 0.70 0.75 - 0.90 0.20 - 0.30 <0.030 <0.030 0.55 - 0.70 - - -
EN 1CS67 - 1 CS 67 - 1.0603
0.52 - 0.72 0.60 - 0.90 0.15 - 0.40 <0.045 <0.045 - - - -
SAE AISI 1065 - J403
0.60 - 070 0.60 - 0.90 - <0.030 <0.050 <0.30 <0.12 <0.40 <0.40
ČSN / STN ČSN 12 061 - 12061
0.57 - 0.65 0.50 - 0.80 0.15 - 0.40 <0.04 <0.04 <0.25 - <0.30 <0.30

 

C67S, 1.1231 - specification and application

Structural steel with low hardening capacity designed for less loaded springs, periodically working for oil hardening and surface hardening with dimensions up to 10mm.

Used as steel for valve springs, coupling springs, shock absorbers, tool steel for i.e. hammers, punches, rakes, chisels, flat springs, adjustable steel washers, and other spring elements.

C67S steel is non-weldable, prone to decarburization and oxidation during heat treatment, and is not resistant to atmospheric corrosion.


Mechanical and physical properties of C67S according to PN-EN 10132-4

Mechanical and physical properties
Heat-treated state C67S +QT
Tensile strength Rm 1200 - 1900 MPa
Hardness HV HRC 370 - 580 HV 38.5 - 54.0 HRC
Cold-rolled state C67S +CR
Tensile strength Rm < 1140 MPa
Hardness HV < 315 HV
Soft state after smoothing rolling C67S +A+LC
Tensile strength Rm < 510 MPa
Yield point Re < 640 MPa
Elongation A > 16%
Hardness HV HRB < 200 HV < 92 HRB
Density ρ 7,82 kg/dm³

 


Heat treatment - 65 / C67S steel grades

Heat treatment of C67S grade
Process Cooling temperatures
Normalizing annealing in air 800 - 830℃
Softening annealing 660 - 700℃
Hardening in oil 830 - 850℃
Tempering in air 460 - 500℃

 


In the C67S and 65 grades the company provides:

 


List of equivalents and other determinations of C67S steel:

C67S, 1.1231, Ck 67, Ck67, Ck68, Ck 68, C68E, 1.1234, C 68 E WW, gat. 65, CS65, CS 65, S65CM, S 65 CM, XC68, XC 68, C 67, C67, 1.0603, 65, 2CS67, 2 CS 67, 1.1231, 1CS67, 1 CS 67, SAE 1065, J403, ČSN 12 061, ČSN 12061, 70Cr2, 70 Cr 2, 1.2007, 2007


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