En36 — Alloy Steel Grade Specification, Properties & Equivalents
En36 is a premier British Standard (BS 970:1955) alloy steel, widely recognized in India for its exceptional combination of high tensile strength, toughness, and wear resistance. Primarily used in its hardened and tempered condition, En36 steel finds critical applications in the
En36 is a premier British Standard (BS 970:1955) alloy steel, widely recognized in India for its exceptional combination of high tensile strength, toughness, and wear resistance. Primarily used in its hardened and tempered condition, En36 steel finds critical applications in the Indian automotive and heavy machinery sectors. Its excellent response to heat treatment makes it a go-to material for components subjected to high stress, fatigue, and abrasion. Procurement engineers and fabricators across India, especially in industrial hubs like Pune and Chennai, rely on En36 for manufacturing vital parts such as gears, crankshafts, camshafts, spindles, and high-load pins. The demand for En36 is driven by its predictable performance and its ability to withstand severe operating conditions, ensuring longevity and reliability in demanding applications. MetaleMart offers comprehensive sourcing solutions for En36, connecting buyers with reputable Indian manufacturers and stockists.
Chemical Composition of En36
| Element | Weight % |
| Carbon (C) | 0.30 - 0.40 |
| Silicon (Si) | 0.10 - 0.35 |
| Manganese (Mn) | 0.40 - 0.70 |
| Phosphorus (P) | Max 0.050 |
| Sulphur (S) | Max 0.050 |
| Chromium (Cr) | 0.90 - 1.50 |
| Molybdenum (Mo) | 0.20 - 0.35 |
| Nickel (Ni) | 1.40 - 2.00 |
Mechanical Properties of En36
| Property | Value (Hardened & Tempered at 550°C approx.) |
| Tensile Strength (Ultimate) | 850 Min MPa |
| Yield Strength (0.2% offset) | 700 Min MPa |
| Elongation at Break | 12% Min |
| Impact Strength (Izod) | 60 J Min (at room temp) |
| Hardness (Brinell) | 255 - 302 HB |
| Density | 7.85 g/cm³ |
| Modulus of Elasticity | 200 GPa |
En36 Available Forms in India
| Shape | Typical Sizes | Standard Length |
| Round Bars | 15mm - 250mm diameter | 6 Metres (random/cut-to-size) |
| Bright Bars | 20mm - 100mm diameter | 6 Metres (random/cut-to-size) |
| Forgings | Customised to order | As per order requirement |
Real-world Applications of En36 Steel
- Automotive Gearing: Manufacturing of high-stress gears for transmissions and differentials.
- Crankshafts & Camshafts: Producing durable crankshafts and camshafts for engines.
- Heavy Machinery Components: Used for high-load pins, shafts, and connecting rods.
- Aerospace: Applications requiring high strength-to-weight ratio and fatigue resistance.
- Tooling: Certain types of dies and molds requiring high wear resistance.
- Mining Equipment: Components subjected to extreme wear and impact.
- Oil & Gas: Downhole drilling components and high-pressure fittings.
- Power Generation: Turbine shafts and critical rotating components.
En36 Machinability & Weldability
Machining En36 requires careful consideration due to its inherent hardness, especially after heat treatment. In its annealed state, En36 exhibits good machinability, comparable to other medium carbon alloy steels. However, in the hardened and tempered conditions (typically >300 HB), machining becomes significantly more challenging, necessitating the use of: **Tool Selection:** Carbide tooling is strongly recommended for turning, milling, and drilling hardened En36. High-speed steel (HSS) tools may be suitable for lower hardness ranges or for annealed conditions. **Cutting Parameters:** Lower cutting speeds and increased feed rates are crucial to prevent tool overheating and premature failure. Specific speeds and feeds will depend on the exact hardness, tooling geometry, and machine rigidity. Flood coolant is essential at all times. **Weldability:** Welding En36 is generally not recommended in the hardened and tempered condition due to the high risk of cracking. If welding is unavoidable, it should be performed in the annealed state. A pre-heat of 200-300°C and a post-weld heat treatment (PWHT) involving slow cooling from around 600°C are critical to mitigate cracking. Low hydrogen electrodes are mandatory, and careful joint design is required. The high alloy content, particularly Nickel and Chromium, in En36 demands stringent welding procedures to maintain its integrity.En36 Heat Treatment & Processing
En36 steel is valued for its excellent hardenability and response to heat treatment, allowing for precise control over mechanical properties. The typical processing route involves annealing followed by hardening and tempering. **Annealing:** Full annealing is usually performed at temperatures around 800-840°C, followed by slow furnace cooling. This process softens the En36 steel, refines the grain structure, and improves machinability, typically achieving a hardness below 250 HB. **Hardening:** For hardening En36, parts are heated to 800-840°C (depending on prior treatment) and quenched in oil or water. Oil quenching is generally preferred to minimize distortion and cracking, especially for complex shapes. This step transforms the austenite into martensite, significantly increasing hardness. **Tempering:** Tempering En36 is crucial for achieving the desired toughness and balancing hardness. Temperatures typically range from 500°C to 650°C, with higher temperatures yielding higher toughness and lower strength. For example, tempering at 550°C typically results in a tensile strength of around 850 MPa and a Brinell hardness of 255-302 HB. Subsequent slow cooling is necessary. Normalizing, if performed, is typically done around 850°C followed by air cooling. Careful control of these heat treatment cycles is vital for optimising the performance of En36 components.Sourcing En36 Steel in India
En36 steel, a high-performance alloy, is available from several reputable Indian manufacturers and large stockists located primarily in the western and southern industrial corridors. Major producers like SAIL and JSW may offer En36 billets or bars, while dedicated specialty steel suppliers and distributors in Mumbai, Pune, and Chennai maintain significant stocks. Typical Minimum Order Quantities (MOQs) for En36 can range from 500 kg to 2 tonnes, depending on the specific size and form (round bar, bright bar, or custom forgings). The indicative price band for En36 in India, as of recent market assessments, typically falls between INR 250/kg to INR 450/kg, although this can fluctuate based on global nickel and chromium prices, order volume, and specific mill sources. Buyers should always expect Mill Test Certificates (MTC) with comprehensive chemical and mechanical test results as per IS or relevant ASTM/BS standards accompanying any En36 supply, confirming the materialInternational Equivalents for En36 Steel
| Standard | Code |
| IS | 31Cr4Mo1 (Similar, but not exact for Ni content) |
| ASTM | 4027 / 8620 (Similar core properties, En36 has higher Ni) |
| SAE | 4320 / 4340 (Related but distinct alloy compositions) |
| EN | 1.6523 / 15NiCr13 |
| JIS | SCrNiMo4 (Approximate) |
| DIN | 1.6523 / 15CrNi6 |
FAQs about En36
What are the primary uses of En36 steel in India?
En36 steel in India is primarily utilized for manufacturing critical engineering components that demand high tensile strength, toughness, and wear resistance. Common applications include automotive gears, crankshafts, camshafts, heavy-duty shafts, spindles, and high-stress pins in machinery. Its excellent hardenability ensures reliable performance under severe operating conditions, making En36 a preferred choice where material failure is not an option.
What is the typical hardness range for En36 steel after heat treatment?
After appropriate hardening (oil quenching from 800-840°C) and tempering (typically around 550°C), En36 steel commonly achieves a Brinell hardness range of 255 to 302 HB. This hardness level provides an excellent balance between wear resistance and toughness, suitable for demanding applications like gears and shafts. The exact hardness can be fine-tuned by adjusting the tempering temperature and time.
Is En36 steel readily available in India?
Yes, En36 steel is generally available from major steel manufacturers and numerous specialized stockists across India, particularly in industrial hubs like Mumbai, Pune, and Chennai. It is typically supplied in the form of round or bright bars. Availability in specific custom forms like forgings might require longer lead times and specific orders, but standard bar stock is usually accessible.
What are the key alloying elements in En36 steel?
The key alloying elements in En36 steel are Nickel (Ni), Chromium (Cr), and Molybdenum (Mo), alongside a medium carbon content. The significant percentage of Nickel (1.40-2.00%) is crucial for enhancing toughness and hardenability, allowing En36 to achieve deep hardening with good ductility. Chromium contributes to hardenability and wear resistance, while Molybdenum improves hardenability and resistance to tempering, ensuring strength retention at elevated temperatures.
What Mill Test Certificate (MTC) should I expect for En36 steel?
For En36 steel sourced in India, you should expect a comprehensive Mill Test Certificate (MTC) that adheres to either IS standards or the original BS 970 specifications, or potentially ASTM/EN equivalents if specified. The MTC must detail the exact chemical composition (C, Si, Mn, P, S, Ni, Cr, Mo), mechanical properties (Tensile Strength, Yield Strength, Elongation, Hardness), and heat treatment condition of the supplied En36 batch, verifying its compliance with the grade requirements.
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