C75S, 1.1248, AISI 1075, XC70 - Carbon low-alloy structural steel for oil hardening for lightweight springs according to PN-74/H-84032 and EN 10132-4.

 

Standards Steel Grades
Chemical Composition %
C: Mn: Si: P: S: Cr: Mo: Ni: Cu:
PN 75
0.72 - 0.80 0.50 - 0.80 0.17 - 0.37 <0.040 <0.040 <0.30 - <0.30 <0.25
EN / DIN C75S - C 75 S - 1.1248 - 1248
0.70 - 0.80 0.60 - 0.90 0.15 - 0.35 <0.025 <0.025 <0.40 <0.10 <0.40 -
AFNOR XC 75 - XC75
0.70 - 0.80 0.40 - 0.70 0.15 - 0.30 <0.035 <0.025 - - - -
DIN C75 - C 75 - 1.0605
0.70 - 0.80 0.60 - 0.80 0.15 - 0.35 <0.045 <0.045 - - - -
GOST 75
0.72 - 0.80 0.30 - 0.70 0.17 - 0.37 <0.035 <0.035 <0.15 - <0.15 <0.20
DIN Ck 75 - Ck75
0.70 - 0.80 0.60 - 0.80 0.15 - 0.35 <0.035 <0.035 - - - -
DIN 75Cr1 - 75 Cr 1 - 1.2003 - 2003
0.70 - 0.80 0.60 - 0.80 0.25 - 0.50 <0.03 <0.03 0.30 - 0.40 - - -
BS CS80
0.75 - 0.85 0.50 - 0.90 0.05 - 0.35 <0.045 <0.045 - - - -
JIS S 75 CM - S75CM
0.70 - 0.80 0.60 - 0.90 0.15 - 0.35 <0.030 <0.035 <0.20 - <0.20 <0.30
STAS OLC 75A - OLC75A
0.70 - 0.80 0.50 - 0.80 0.17 - 0.37 <0.040 <0.040 <0.30 - <0.30 <0.25
ČSN / STN 12081 - 12 081
0.70 - 0.80 0.40 - 0.65 <0.35 <0.035 <0.035 - - - -
ASTM AISI 1075
0.70 - 0.80 0.40 - 0.70 - <0.040 <0.050 - - - -

 

Steel C75S - 75 grade - specification and application

75 steel - C75S - Carbon spring steel with low hardening capacity for lightweight springs for oil hardening. It is characterized by resistance to abrasion and high strength. Used for low-loaded springs and springs, spring parts, clock springs, saws for cutting stones in the form of tapes and sheets.

As a constructional steel, it is used for medium-weight machine parts such as bolts and bucket links, rolls, molding boards, agricultural machinery parts, press plates and ball mills, press rods, and briquette presses. Non-weldable steel, resistant to temper embrittlement, prone to decarburization and oxidation during heat treatment.


Mechanical and physical of 75 - C75S grade

Mechanical and physical properties
Heat-treated state C75S +QT
Tensile strength Rm 1200 - 1900 MPa
Hardness HV HRC 370 - 580 HV 38.5 - 54.0 HRC
Cold-rolled state C75S +CR
Tensile strength Rm ≤ 1170 MPa
Hardness HV ≤ 320 HV
Soft state after smoothing rolling C75S +A+LC
Tensile strength Rm ≤ 640 MPa
Yield point Re ≤ 510 MPa
Elongation A > 15%
Hardness HV HRC < 200 HV < 93 HB
General properties of C75S grade
Tensile strength Rm ≥ 1080 MPa
Yield point Re ≥ 880 MPa
Hardness in the raw condition ≤ 285 HB
Hardness in softened condition ≤ 241 HB
Contraction Z ≥ 30%
Elongation A ≥ 9%
Density ρ ~7.85 kg/dm³
Linear Expansion Factor α20-100℃ ~11.4 ⋅ 10⁻⁶ K⁻¹
Heat capacity cp 20-100℃ ~483 J ⋅ ​kg⁻¹ K⁻¹
Heat conductivity λ20℃ 49.81 W ⋅ m⁻¹ K⁻¹

 


Heat treatment of C75S, C75, 1.1248 steel - process and temperatures

Heat treatment
Process Cooling Temperatures
Normalizing annealing in air 790 - 820℃
Softening annealing 660 - 700℃
Hardening in oil 810 - 830℃
Tempering in air 460 - 500℃

 


In the 75 and C75S grades the company provides:

 


Equivalents of 75 PN grade

gat. 75, C75S, C 75 S, 1.1248, 1248, XC 75, XC75, C75, C 75, 1.0605, 75, CS80, S 75 CM, S75CM, OLC 75A, OLC75A, ČSN 12081, ČSN 12 081, AISI 1075, 75Cr1, 75 Cr 1, 1.2003, 2003


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