EN 353 round bar — ready stock in Mumbai
We supply EN 353 (815M17) as round bar, Ø16–205 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
Datasheet: Download the EN 353 / 815M17 datasheet (PDF, 2 pages)
EN 353 is a nickel-chromium-molybdenum case-hardening steel. Carburised and hardened, it produces a hard, wear-resistant surface over a strong, shock-absorbing core — the classic choice for gears, shafts and transmission components subject to both wear and impact.
Weight %, balance iron. Left: what we actually supply. Right: the international standard, for reference. Indian mills still make EN 353 to the original BS 970 En353 range, shown on the left. The later 815M17 grade asks for more nickel (1.20–1.70%) and molybdenum (0.10–0.20%). 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: 815M17, BS 970, % |
|---|---|---|
| Carbon (C) | max 0.20 | 0.14–0.20 |
| Silicon (Si) | max 0.35 | 0.10–0.35 |
| Manganese (Mn) | 0.50–1.00 | 0.60–0.90 |
| Phosphorus (P) | max 0.050 | not stated |
| Sulphur (S) | max 0.050 | not stated |
| Chromium (Cr) | 0.75–1.25 | 0.80–1.20 |
| Nickel (Ni) | 1.00–1.50 | 1.20–1.70 |
| Molybdenum (Mo) | 0.08–0.15 | 0.10–0.20 |
Typical values in the carburised, hardened and tempered condition.
| Property | Typical value |
|---|---|
| Case hardness (surface) | 58–62 HRC |
| Core hardness | 30–42 HRC |
| Core tensile strength | 800–1100 MPa |
| Core elongation A5 | 9–12 % |
| Supply hardness (annealed) | max. 217 HB |
| Transformation point | Temperature (°C) |
|---|---|
| Ac1 | 725 |
| Ac3 | 810 |
| Ms (core) | 380 |
| Treatment | Temperature cycle | Cooling / quenching |
|---|---|---|
| Normalizing | 870–900 °C | In still air |
| Carburising | 900–925 °C | Case depth to requirement |
| Core refining | 860–890 °C | Quench in oil |
| Hardening | 820–850 °C | Quench in oil |
| Tempering | 150–200 °C | In air |
| Soft annealing | 650–680 °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) | 12 µm/m·K |
| Specific heat | 460 J/kg·K |
| Thermal conductivity | 42 W/m·K |
| Electrical resistivity | 0.22 µΩ·m |
What sizes of EN 353 do you stock?
EN 353 round bar from Ø16 to Ø205 mm, from ready stock at Darukhana, Mumbai. We do not stock EN 353 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 EN 353?
Common equivalent designations for EN 353 include 815M17, 17NiCrMo6-4 (1.6566) and IS 15Ni5Cr4Mo1. Please confirm suitability for your application with our team.
Need EN 353 in a specific size?
We hold EN 353 round bar in ready stock from Ø16mm to Ø205mm. Send us the size and quantity for a fast quote.
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