C20
Grade Introduction:
C-20 carbon steel is an unalloyed low carbon mild steel grade supplied as a hot rolled or bright drawn finish bar. As a low carbon steel grade, it provides low strength with good machinability and is suitable for welding.
Grade Application
Commonly used for general engineering C-20 is suitable for applications such as bolts, shafts, spacers, hubs, base plates, brackets. fixtures and jigs.
Equivalent Grades
| Stocked Product | BS 970:1955 | British Standards | European | Werksoff | SAE/AISI | Lesser | Greater |
| 070M20 (070) | EN3AEN32 | 080A15 | C15C20ST52-3(ST5)S235(S23)S275(S27 & S28) | 1.04021.04011.1151 | 10201023 | – | LF2 (LF2) |
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 C20 steel:
| Element | C | Mn | Si | S | P |
| Content(%) | 0.17-0.23 | 0.30-0.60 | 0.10-0.40 | ≤0.045 | ≤0.045 |
Mechanical Properties
| MECHANICAL PROPERTIES | METRIC | IMPERIAL |
| Tensile strength | 425 MPa | 61600 psi |
| Yield strength | 360 MPa | 52200 psi |
| Shear modulus | 80.0 GPa | 11600 ksi |
| Bulk modulus | 140 GPa | 20300 ksi |
| Elastic modulus | 190-210 GPa | 27557-30458 ksi |
| Poisson’s ratio | 0.27-0.30 | 0.27-0.30 |
| Elongation at break | 0.15 | 0.15 |
| Reduction of area | 0.4 | 0.4 |
| Hardness Brinell | 121 | 121 |
| Hardness, Knoop | 140 | 140 |
| Hardness, Rockwell B | 68 | 68 |
| Hardness, Vickers | 126 | 126 |
| Machinability | 65 | 65 |
Heat Treatment
When hardening C-20 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 component. Other considerations during the heat treatment process include the type of furnace, quenching medium, and workpiece transfer facilities.
Hardening
As a low carbon steel C-20 is not ideally suited for heat treatment (EN8 or EN9 may be a better-suited option). If hardening is required heat to a temperature of 880-910°C. Quench in water and temper.
Machinability
Surface ‘ripping’ is more evident in EN3 so lubrication is essential. Fairly high surface speeds should be used with moderate feeds. Screw cutting is easy with cutting oil and achieving a fine finish is achieved with slight polishing. Very nice to weld with good flow and strength.
Annealing
C-20 is commonly supplied bright drawn or as rolled. If annealing is required heat to 880-910°C, furnace cool.
Physical Properties
- Annealed hardness | HBS: 156 max
- Tensile strength,σb/≥ MPa: 400
- Yield strength, σ0.2/≥ MPa: 270
- Elongation, δ ≥(％): 27.0
- Impact, ≥J /Akv: –
Thermal Properties
| PROPERTIES | METRIC | IMPERIAL |
| Thermal conductivity | 51.9 W/mK | 360 BTU in/hr.ft².°F |
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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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.
