CK-45

Grade Introduction:
Carbon Steel CK 45 is suitable for mean strained parts of higher dimensions (heavy forged parts) and complexed forms in vehicle manufacturing and machine engineering (e.g. ship shafts, transmission parts, wheel hubs). Lowest application temp. -25 °C, favorable creep behavior up to 480 °C.

Grade Application

Suitable for manufacturing various strong cutting tools with wear-resistant, resistant to impact. Advanced punching die, screw die, the toughness and complicated shape of the punch, etc. Roll cutting tool industry: scraper, serrated knife, iron knives, drill bits, etc.

Forging Industry: Forging Die

Screw industry: heading forming mold, such as teeth, punch.

Addition to other grades

MS, EN1A, EN3B, EN8, EN8D, EN9, EN19, EN24, EN31, EN32B, EN36C, EN41B, EN43B, EN47, EN353, IS2062, 42Crmo4, HCHCR, D2, D3, H-11, H-13, CW-1, OHNS, M2, M35, M42, DIN1.2714, P20, P20+S, P20+Ni, SCM420, ASTMSA-36, ASTMSA-105, SAE1018, SAE4140, SAE8620, 16MNCR5, 20MNCR5, C20, C45, C50, C60, CK45, 20C8, 40C8, 45C8, 55C8, C55MN75, SAE52100, S40C, S355J2G3.

Equivalent Grades

USA German Japan China ISO
ASTM A681 DIN 17350 JIS G4403 GB/T 1299 ISO 4957
1045 CK45 S45C 45 C45E4

Our Supply Range

We supply to automotive ancillaries and OEM customers. The products we manufacture are used as input for manufacturing of automotive and general engineering components. These components are further assembled into systems fitted in automobiles and other engineering applications.

Product Type Size Range
Forged Round Bars 140mm Dia to 850mm
Rolled Round Bars 16mm Dia and above
Forged Flat Bars Thickness: 32mm to 510mm, Width: 65mm to 1050mm
Rolled Flat Bars Thickness: 6mm to 110mm, Width: 25mm to 510mm

Chemical Composition

The following table shows the chemical composition of CK45 steel:

Element C Si Mn P S
Content(%) 0.42-0.5 0.4 0.5-0.8 0.04 0.03

Hardness

Hardness, Rockwell C (Water quenched on 820-870°C, 5 minutes): 201~269HB

Heat Treatment

Heat Treatment of AISI 1045 (CK45) followed by furnace cooling at 50ºF (28ºC) per hour, to 1200ºF (650ºC) soaking and air cooling. Hardening of this grade is carried out from an austenitizing temperature of 1475-1550ºF (800-845ºC) and oil or water quenching.

Hardening

Hardening of this grade is carried out from an austenitizing temperature of 1475-1550ºF (800-845ºC) and oil or water quenching.
Flame and induction hardening may be carried out by heating quickly to the desired case depth and quenching in water or oil. This should be followed by a tempering treatment at 300-400ºF (150-200ºC) to reduce stresses in the case without affecting its hardness. A surface hardness of Rc 58 may be obtained by this treatment.

Tempering

Tempering temperature / ℃ : 552
After tempering hardness HRC or higher: 201-269HB.

Normalizing

840-870°C

Machinability

Machinability is good, rated at 80% that of the AISI 1112 alloy used as a 100% machining rated steel.

Annealing

Full annealing of small C1045 forgings is carried out from 1450-1600ºF (790-870ºC) followed by furnace cooling at 50ºF (28ºC) per hour, to 1200ºF (650ºC) soaking and air cooling.

Mechanical Properties

Elastic modulus 217 GPa at – 100 °C
Elongation 4 -8 % at 20 °C
Poisson’s ratio 0.29 [-]  at 20 °C
Shear modulus 75 – 80 GPa at 20 °C
Tensile strength 580 – 770 MPa at 20 °C
Yield strength 330 – 640 MPa at 20 °C

Physical Properties

Quantity
Value
Unit
Thermal expansion
10 – 10
e-6/K
Thermal conductivity
25 – 25
W/m.K
Specific heat
460 – 460
J/kg.K
Melting temperature
1450 – 1510
°C
Density
7700 – 7700
kg/m3
Resistivity
0.55 – 0.55
Ohm.mm2/m

Thermal Properties

  • Coefficient of thermal expansion α 1.08E-5 1/K at -100 °C
  • Thermal conductivity λ 41.7 W/(m·K) at 20 °C
  • Thermal diffusivity αdiff 11.6 mm²/s at 20 °C

Forging Properties

At first, Pre-Heating to 552℃，Then heat to forged temperature. Next, Soak at 820-870 °C , ensure heat thorough. Then start forged, the forged temperature no low than 560℃. After forging, cool slowly.

Density

Density 7.8 g/cm³ at 20 °C

Supply Cities

Ambattur, Bangalore, Chennai, Coimbatore, Dindigul, Guindy, Madurai, Nellore, Hyderabad, Tirupur, Tuticorin, Madurai, Andhra Pradesh, Karnataka, Puducherry, Kerala, Kanyakumari, Telangana, Salem, Thanjavur, Trichy, Erode, Vellore, Karur, Nagercoil, Kanchipuram, Karaikudi, Pudukottai, Nagapattinam.

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