SAE 8620 round bar — ready stock in Mumbai
We supply SAE 8620 (21NiCrMo2) as round bar, Ø14–315 mm, from ready stock at Darukhana, Mumbai. Cutting is available if the balance piece is also taken, and every dispatch ships with a mill test certificate.
Need the weight? Use our round bar weight calculator — kg per metre and total weight for any size.
Related guides: Equivalent grades chart · Hardness in HRC · BS 970 codes explained · How to read a mill test certificate
SAE 8620 is a versatile, cost-effective low-alloy carburising steel. After carburising, hardening and tempering it develops a hard, wear-resistant case (58–63 HRC) over a tough, shock-resistant core — one of the most widely used case-hardening grades in general engineering and automotive manufacture.
Weight %, balance iron. Left: what we actually supply. Right: the international standard, for reference. The alloying elements match SAE 8620 exactly. The mill range allows more phosphorus and sulphur (up to 0.045%) than SAE J404 (0.030% and 0.040%). If your drawing calls for the strict standard, mention it in your enquiry. Every dispatch comes with the mill test certificate for its heat.
| Element | As supplied: Indian mill range, % | Standard: SAE J404 8620, % |
|---|---|---|
| Carbon (C) | 0.18–0.23 | 0.18–0.23 |
| Silicon (Si) | 0.15–0.35 | 0.15–0.35 |
| Manganese (Mn) | 0.70–0.90 | 0.70–0.90 |
| Phosphorus (P) | max 0.045 | max 0.030 |
| Sulphur (S) | max 0.045 | max 0.040 |
| Chromium (Cr) | 0.40–0.60 | 0.40–0.60 |
| Nickel (Ni) | 0.40–0.70 | 0.40–0.70 |
| Molybdenum (Mo) | 0.15–0.25 | 0.15–0.25 |
Typical values in the carburised, hardened and tempered condition.
| Property | Typical value |
|---|---|
| Case hardness (surface) | 58–63 HRC |
| Core hardness | 30–45 HRC |
| Core tensile strength | 650–950 MPa |
| Core yield strength | 400–700 MPa |
| Core elongation A5 | 10–15 % |
| Supply hardness (annealed) | max. 197 HB |
| Transformation point | Temperature (°C) |
|---|---|
| Ac1 | 720 |
| Ac3 | 840 |
| Ms (core) | 400 |
| Treatment | Temperature cycle | Cooling / quenching |
|---|---|---|
| Normalizing | 870–900 °C | In still air |
| Carburising | 880–930 °C | Case depth to requirement |
| Core refining | 870–900 °C | Quench in oil |
| Hardening | 780–820 °C | Quench in oil |
| Tempering | 150–200 °C | In air |
| Soft annealing | 680–710 °C | Furnace cool |
Indicative hardness gradient from the carburised surface into the tough core, for a typical effective case depth. Actual profile is set by the carburising cycle.
Typical values at ambient temperature unless stated.
| Property | Typical value |
|---|---|
| Young’s modulus | 205 GPa |
| Poisson’s ratio | 0.30 |
| Shear modulus | 80 GPa |
| Density | 7,850 kg/m³ |
| Thermal expansion (20–300 °C) | 11.6 µm/m·K |
| Specific heat | 470 J/kg·K |
| Thermal conductivity | 46 W/m·K |
| Electrical resistivity | 0.20 µΩ·m |
What sizes of SAE 8620 do you stock?
SAE 8620 round bar from Ø14 to Ø315 mm, from ready stock at Darukhana, Mumbai. We do not stock SAE 8620 in square or flat.
What is the minimum order quantity?
Our minimum order is 100 kg.
Do you cut bars to size?
Yes. Cutting is available provided the balance piece is also taken by the buyer; cutting is charged extra.
Is delivery included in the price?
Prices are ex-Darukhana, Mumbai. Loading, transport and cartage are extra, charged at actuals.
Do you provide a mill test certificate?
Yes. Every dispatch is accompanied by a mill test certificate stating the actual results for that heat.
What are the equivalent grades of SAE 8620?
Common equivalent designations for SAE 8620 include 21NiCrMo2, 1.6523, 805M20, SNCM220. Please confirm suitability for your application with our team.
Need SAE 8620 in a specific size?
We hold SAE 8620 round bar in ready stock from Ø14mm to Ø315mm. Send us the size and quantity for a fast quote.
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