Description
20C8 Grade Introduction:
20C8 is an unalloyed low carbon steel grade, commonly used for case hardening. When carburized, it exhibits a hard, wear-resistant surface with a core strength of 430-490 N/mm². Known for its machinability and weldability in its supply condition, 20C8 is ideal for lightly stressed components used in general engineering applications.
20C8 Grade Applications:
This steel is widely used for components subject to wear, such as:
- Collets
- Cams
- Rollers
- Bushes
- Spindles
- Gears
20C8 Equivalent Grades:
- IS: 20C8
- BS: C20, 070M20
- DIN: C20, 3D
- SAE: 1018, 1019, 1021, 1022
Additional Comparable Grades:
- MS, EN1A, EN3B, EN8, EN9, EN24, EN31, EN32B, EN36C, EN41B, EN43B, EN47, EN353, IS2062
- 42CrMo4, HCHCR, D2, D3, H-11, H-13, CW-1, OHNS M2, M35, M42
- DIN-1.2714, P20, P20+S, P20+Ni, SCM420, ASTM SA-36, ASTM SA-105
- SAE1018, SAE1010, SAE4140, SAE8620, 16MNCR5, 20MNCR5, C20, C45, C50, C60, CK45
- 20C8, 40C8, 45C8, 55C8, C55MN75, SAE52100, S40C, S355J2G3
20C8 Chemical Composition:
| Element | Content (%) |
|---|---|
| Carbon (C) | 0.15 – 0.25 |
| Manganese (Mn) | 0.60 – 0.90 |
| Silicon (Si) | 0.15 – 0.35 |
| Sulfur (S) | Max 0.40 |
| Phosphorus (P) | Max 0.40 |
20C8 Mechanical Properties:
| Property | Value |
|---|---|
| Tensile Strength (N/mm²) | 430 |
| Impact (Izod) (J) | 18 |
| Impact (KCV) (J) | 39 |
| Hardness (Brinell) | 35 |
20C8 Hardness:
The hardness of 20C8 can be improved through carburizing, followed by quenching and tempering.
20C8 Heat Treatment:
The heat treatment process, including heating, soaking, and cooling times, varies depending on the component’s size and shape. Factors like furnace type, quenching medium, and handling also influence the heat treatment procedure.
20C8 Hardening:
Hardening of 20C8 is achieved by heating to 760-780°C, followed by quenching in water.
20C8 Tempering:
Tempering is recommended to relieve stress and achieve maximum case toughness. The tempering temperature typically ranges from 150-200°C.
20C8 Physical Properties:
- Density: The density of 20C8 is consistent with other low-carbon steels, approximately 7.85 g/cm³.
20C8 Thermal Properties:
| Property | Imperial | Metric |
|---|---|---|
| Thermal Conductivity | 360 BTU in/hr.ft².°F | 51.9 W/mK |
20C8 Forging Properties:
For optimal forging results, soak 20C8 at 1177°C (2150°F) for 1 hour before forging. Avoid working below 1010°C (1850°F). After forging, post-work solution treatment is required for best results.
20C8 Stress Relieving:
Stress relieving of 20C8 is recommended after heavy machining or forming to eliminate residual stresses.
20C8 Normalizing:
Normalizing 20C8 involves heating to around 900°C and air cooling to improve its mechanical properties.
20C8 Annealing:
Annealing is performed at temperatures ranging from 800-850°C, followed by slow cooling to relieve stresses and soften the material for machining.
20C8 Machinability:
Characterized by long, gummy chips, 20C8 offers good machinability in its annealed state. For best results, parts should be machined in the H1150M condition, followed by post-machining solution treatment before final hardening.
20C8 Welding:
20C8 can be welded successfully using common fusion and resistance welding techniques. Oxyacetylene welding is not recommended. If necessary, AWS E/ER630 filler metal should be used for welding.
Our Supply Range:
- We supply a wide range of sizes and forms in 20C8 steel.
Price List:
- 20C8: Competitive pricing based on order volume and specific requirements.
Supply Cities:
Mumbai 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, Visakhapatnam, Kochi, Kerala, Hubli-Dharwad, Karnataka, Ghaziabad Kolkata.
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