20C8
Grade Introduction:
20C8 Carbon steel is an unalloyed low carbon grade. Components when carburized have a core strength range of 430-490N/mm² with the hard wear-resistant surface case. It is a popular case hardening steel grade for general engineering, readily machinable and weldable in its supply condition. 20C8 is low tensile steel suited for lightly stressed components.
Grade Application
Commonly used for general engineering lightly stressed applications that are subject to wear, 20C8 is suitable for applications such as collets, cams, rollers, bushes, spindles, and gears.
Equivalent Grades
| IS | BS | DIN | SAE | |||||
| Current | Obsolete | Obsolete | Current | Obsolete | Current | Current | – | – |
| 20C8 | C20 | 3D | 070M20 | – | – | – | 1018, 1019, 1021, 1022 | – |
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 and above |
| Rolled Round Bars | 12mm Dia and above |
| Forged Flat Bars | Thickness: 32mm to 510mm, Width: 65mm to 1050mm |
| Rolled Flat Bars | Thickness: 6mm to 110mm, Width: 25mm to 810mm |
Chemical Composition
The following table shows the chemical composition of 20C8 steel:
| Element | C | Mn | Si | S | P |
| Content (%) | 0.15 – 0.25 | 0.60 – 0.90 | 0.15 – 0.35 | 0.40 Max | 0.40 Max |
Heat Treatment
Heat treatment temperatures, including the rate of heating, cooling, and soaking times will vary due to factors such as the shape and size of each steel component. Other considerations during the heat treatment process include the type of furnace, quenching medium, and workpiece transfer facilities.
Tempering
Tempering is recommended for stress relief and maximum case toughness. Tempering ranges from 150-200°C.
Thermal Properties
| Property | Imperial | Metric |
| Thermal Conductivity | 51.9 W/mK | 360 BTU in/hr.ft².°F |
Mechanical Properties
| TYPICAL MECHANICAL PROPERTIES | TENSILE STRENGTH N/MM² | 18 | IMPACT IZOD J | IMPACT KCV J |
| 430 | 18 | 39 | 35 |
Hardening
Harden at a temperature of 760-780°C. Quench in water.
Forging Properties
Soak for 1 hour at 2150 F (1177 C) prior to forging. Do not work below 1850 F (1010 C). Post-work solution treatment is required prior to final hardening.
Machinability
Long, gummy chips characterize this alloy’s machinability. It can be machined in the annealed condition, however, condition H1150M will yield the best results. Post machining solution treatment of parts will be required prior to final hardening if machining in this condition.
Welding
Successfully welded by common fusion and resistance methods, this alloy should not be joined by oxyacetylene welding. AWS E/ER630 filler metal is recommended if required.
Supply Cities
Ambattur, Bangalore, Chennai, Chengalpattu, Coimbatore, Dindigul, Guindy, Madurai, Nellore, Hyderabad, Hosur, Tiruvallur, Tirupur, Tuticorin, Andhra Pradesh, Karnataka, Puducherry, Kerala, Kanyakumari, Telangana, Salem, Thanjavur, Trichy, Erode, Vellore, Karur, Nagercoil, Kanchipuram, Karaikudi, Pudukottai, Nagapattinam, Nemili Thiruvanmiyur, Perungudi, Kurichi, Kakkalur, Keelanagachi, Paramakudi, Thandarai, Alathur, Kodur, Mallur, Gangaikondan, Sriperumbudur, Oragadam,Irungattukottai, Vallam Vadagal, Siruseri,Eraiyur, Manapparai, Perundurai, Ranipet, Gummidipoondi, Cheyyar, Manamadurai, Tindivanam , Mappedu , Thervoykandigai , Nilakottai, Shoolagiri, Kurubarapalli, Bargur, Thirumudivakkam, Cuddalore, Pillaipakkam.
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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.
