55C8

 

Grade Introduction:

55C8 Carbon steels have carbon as the key alloying element in their composition. They also contain up to 0.4% silicon and 1.2% manganese. In addition, the residual elements such as copper, molybdenum, aluminum, chromium, and nickel are present in these steels.

55C8 is a water resisting carbon steel whose wear resistance and hardenability are increased by the addition of a small quantity of chromium.

Grade Application:

• Levers

• Bolts

• Nuts

• Studs

Equivalent grades:

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.

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Chemical composition:

The following table shows the chemical composition of 55C8 steel:

Element	C	Mn	Si	S	P
Content (%)	0.310 – 0.380	0.60 – 0.90	98.63 – 99.09	0.050 Max	0.040 Max

Mechanical Properties:

PROPERTIES	METRIC	IMPERIAL
Tensile strength, ultimate	585 MPa	84800 psi
Tensile strength, yield	370 MPa	53700 psi
Modulus of elasticity	190-210 GPa	29700-30458 ksi
Bulk modulus (typical for steel)	140 GPa	20300 ksi
Bulk modulus (typical for steel)	140 GPa	20300 ksi
Shear modulus (typical for steel)	80 GPa	11600 ksi
Poissons ratio	0.27-0.30	0.27-0.30
Elongation at break (in 50 mm)	0.3	0.3
Reduction of area	0.53	0.53
Hardness, Brinell	183	183
Hardness, Knoop (converted from Brinell hardness)	204	204
Hardness, Rockwell B (converted from Brinell hardness)	89	89
Hardness, Vickers (converted from Brinell hardness)	192	192
Machinability (based on AISI 1212 steel. as 100 machinability)	65	65

Hardness:

Heat treatment:

Hardening:

Tempering:

Physical Properties:

PROPERTIES	METRIC	IMPERIAL
Density	7.85 g/cm 3	0.284 lb/in 3

Thermal Properties:

THERMAL PROPERTIES	METRIC	IMPERIAL
Thermal expansion co-efficient (@20°C/68°F)	11 µm/m°C	6.11 µin/in°F
Thermal conductivity	51.9 W/mK	360 BTU in/hr.ft 2 .°F

Forging Properties:

Stress Reliving:

Normalizing:

Annealing:

Density:

Machinability:

Welding:

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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