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Grade Introduction:
C55MN75 Carbon steels are steels having carbon as the major alloying element. They also contain up to 1.2% manganese and 0.4% silicon. In addition, residual elements like copper, molybdenum, aluminum, chromium, and nickel are present in these steels.
 
Grade Application:
  • Agricultural implements
  • Heavy machinery components
  • Wear-resistant parts
  • Ring-rolling tools
  • Battering tools
  • Hand tools
  • Springs
 
Equivalent grades:
 
Addition to other grades:
MS, EN1A, EN3B, EN8, EN8D, EN9, EN19, EN24, EN31, EN32B, EN36C, EN41B, EN43B, EN47, EN353, IS2062, 42Crmo4, OHNS, HCHCR, D2, D3, H-11, H-13, CW-1, M2, M35, M42, 2714, SKD-11, P20, P20+S, P20+Ni, SCM 420, ASTM SA-36, ASTM SA-105, SAE 1018, SAE 1020, SAE 4140, SAE 8620, 16MNCR5, 20MNCR5, C20, C35, C40, C45, C50, C60, CK45, 20C8, 40C8, 45C8, 55C8, SAE 52100, S40C, S355J2G3.
 
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Chemical composition:
 
Mechanical Properties:
 
PROPERTIES

 

                         METRIC           
                         IMPERIAL                      
Tensile strength, ultimate
660 MPa
95700 psi
Tensile strength, yield
560 MPa
81200 psi
Modulus of elasticity
190-210
GPa
29700-30458
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)
10%
10%
Reduction of area
40%
40%
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:
 
Heat treatment:
 
Hardening:
 
Tempering:
 
Physical Properties:
PROPERTIES
METRIC
IMPERIAL
Density
7.85 g/cm3
0.284 lb/in3
 
Thermal Properties:
 
Forging Properties:
 
Stress Reliving:
 
Normalizing:
Normalize at 1550° to 1625°F (843° to 885°C)
 
Annealing:
Full anneal at 1525° to 1600°F (829° to 871°C) before furnace cooling process anneal at 1100° to 1225°F (593° to 663°C) after cold working
 
Density:
PROPERTIES
METRIC
IMPERIAL
Density
7.85 g/cm3
0.284 lb/in3
 
Machinability:
Sulfured or chlorinated cutting oils for high-speed steel cutters
No oil for carbide-tip tools
Grind high-speed steel turning tools
8-12° side rake
6-10° back rake
7-9° side and end relief
12-16° side cutting-edge angle
8-14° end cutting-edge angle
Nose radius 10% of cut depth
Grind carbide-tip tools
6-12° side rake
2-8° back rake
6-10° side and end relief
8-12° end cutting-edge angle
8-16° side cutting-edge angel
1/32” nose radius
 
Welding:
 
Supply Cities:
Ahmedabad, Amaravathi, Ambattur, Bangalore, Belgaum, Chennai, Chittoor, Coimbatore, Dindigul, Mysore, Nellore, Hyderabad, Kochi, Mangalore, Tirupur, Tuticorin, Madurai, Andhra Pradesh, Karnataka, Puducherry, Kerala, Tamil Nadu, Telangana, Salem, Thanjavur, Trichy, Erode, Vellore, Ranipet, Sivakasi, Karur, Hosur, Nagercoil, Kanchipuram, Karaikudi, Neyveli, Cuddalore, Kumbakonam, Thiruvannamalai, Pollachi, Rajapalayam, Gudiyatham, Pudukottai, Vaniyambadi, Ambur, Nagapattinam, Trivandrum, Vijayawada, Guntur, Thirupathi, Nazarathpet, Kakinada, Kurnool, Kadapa, Nizamabad, Mahabubnagar, Karimnagar.
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