40C8

Grade Introduction:

40C8 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, residual elements such as copper, molybdenum, aluminum, chromium, and nickel are present in these steels.

Grade Application:

C40 Steel material is suitable for all general engineering applications requiring a higher strength than mild steel such as:

• General Purpose Axles

• Shafts

• Gears

• Bolts and Studs

• Spindles

• Automotive and General Engineering Components

• General Engineering Parts etc.,

Equivalent grades:

Classification	IS	EN	DIN	AISI/SAE	JIS
Medium Carbon Steel	30C8,35C8,40C8,45C8,50C8, 55C8, CL-III, CL-IV, CL-V	EN-8, EN-8D, EN-9	CK-30, CK-35, CK-40, CK-45, CK-50, CK-55, CK-60	1030 10351040 10451050 10551060	–

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.

 

Our Supply Range:

Price List:

 

Chemical composition:

The following table shows the chemical composition of 40C8 steel:

Element	C	Mn	Si	S	P
Content (%)	0.35 – 0.45	0.60 – 0.90	0.10 – 0.35	0.35 Max	0.35 Max

Mechanical Properties:

PROPERTIES	METRIC	IMPERIAL
Tensile strength Ultimate	660 MPa	95700 psi
Tensile strength Yield	560 MPa	81200 psi
Bulk modulus (typical for steels)	140 GPa	20300 ksi
Shear modulus (typical for steels)	80 GPa	11600 ksi
Elastic modulus	190 – 210 GPa	19700- 30458 ksi
Poisson’s ratio	0.27 -0.30	0.27 -0.30
Elongation at break (in 50 mm)	0.1	0.1
Reduction of area	0.4	0.4
Hardness, Brinell	197	197
Hardness, Knoop (converted from Brinell hardness)	219	219
Hardness, Rockwell B (converted from Brinell hardness)	92	92
Hardness, Rockwell C (converted from Brinell hardness. Value below normal HRC range, for comparison purposes only)	13	13
Hardness, Vickers (converted from Brinell hardness)	207	207
Machinability (based on AISI 1212 steel. as 100 machinability)	55	55

Hardness:

197

Heat treatment:

1611°C – 1367°C

Hardening:

Tempering:

550°C – 660°C

Physical Properties:

PROPERTIES	METRIC	IMPERIAL
Density	7.85 g/cm3	0.284 lb/in³

Thermal Properties:

PROPERTIES	METRIC	IMPERIAL
Thermal expansion co-efficient	11 µm/m°C	6.11 µin/in°F
Thermal conductivity	49.8 W/mK	346 BTU in/hr.ft².°F

Forging Properties:

Preheat the 40C8 steel carefully, then raise temperature to 1050°C for forging. Do not forge below 850°C. After forging cool 40C8 steel slowly, preferably in a furnace.

Stress Reliving:

Normalizing:

Normalizing of 40C8 bright mild steel takes place at 830-860°C (1526°F-1580°F) then it is cooled in air.

Annealing:

680 – 710°C

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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