Description
EN30B Alloy Steel Introduction:
EN30B is a high-strength nickel-chromium-molybdenum alloy steel renowned for its exceptional toughness, wear resistance, and hardenability. The steel’s composition, with a high nickel content, contributes to excellent strength and toughness, even in large sections. EN30B is typically supplied in the hardened and tempered condition, and it exhibits superb fatigue resistance, making it ideal for applications subjected to heavy stresses, wear, and repeated loading.
EN30B alloy steel is widely used in industries such as aerospace, automotive, and general engineering, where components must endure high stresses, impact, and wear. It is a versatile material with excellent machinability and hardening capabilities, making it suitable for a wide range of manufacturing and engineering applications.
EN30B Alloy Steel Application:
EN30B alloy steel is used in applications that require high strength, toughness, and resistance to wear and fatigue. Common applications include:
- Aerospace Industry: Components like landing gears, engine shafts, and structural parts.
- Automotive Industry: Gears, crankshafts, and heavy-duty axles.
- Engineering Components: Spindles, couplings, and heavy-duty shafts.
- Power Generation: Turbine blades, connecting rods, and heavy-load bearing parts.
- Oil and Gas: Drill collars, valve stems, and components for drilling equipment.
- Tooling: High-stress tools like forging dies and cutting tools.
EN30B Alloy Steel Equivalent Grades:
| Standard | Equivalent Grade |
|---|---|
| BS970 | EN30B |
| AISI/SAE | 4340 |
| DIN | 1.6582 |
| UNS | G43400 |
| JIS | SNCM439 |
EN30B Alloy Steel Chemical Composition:
The table below shows the chemical composition of EN30B alloy steel:
| Element | Composition (%) |
|---|---|
| Carbon (C) | 0.28-0.33 |
| Silicon (Si) | 0.10-0.35 |
| Manganese (Mn) | 0.45-0.70 |
| Nickel (Ni) | 3.00-3.75 |
| Chromium (Cr) | 1.00-1.25 |
| Molybdenum (Mo) | 0.20-0.30 |
| Phosphorus (P) | 0.035 max |
| Sulfur (S) | 0.035 max |
EN30B Alloy Steel Mechanical Properties:
EN30B offers excellent mechanical properties, making it ideal for high-stress applications. The following table outlines the typical mechanical properties of EN30B alloy steel:
| Property | Value (Typical) |
|---|---|
| Tensile Strength (MPa) | 930 – 1080 |
| Yield Strength (MPa) | 680 |
| Elongation (%) | 13 |
| Impact Toughness (J) | 40 (at 20°C) |
| Hardness (HB) | 248 – 302 |
EN30B Alloy Steel Heat Treatment:
EN30B can undergo various heat treatment processes to enhance its mechanical properties:
- Annealing: Heat to 820-850°C, hold until temperature is uniform, then cool slowly in the furnace to refine the grain structure.
- Hardening: Heat to 840-870°C, then quench in oil or water to achieve maximum hardness.
- Tempering: After hardening, temper at 500-600°C to reduce brittleness and improve toughness, based on desired properties.
EN30B Alloy Steel Hardness:
EN30B alloy steel has a hardness range of 248 – 302 HB in the hardened condition. When tempered, the hardness typically falls within the range of 200 – 280 HB, depending on the tempering temperature.
EN30B Alloy Steel Physical Properties:
| Property | Value |
|---|---|
| Density | 7.85 g/cm³ |
| Thermal Conductivity | 42 W/m·K (at 20°C) |
| Specific Heat Capacity | 460 J/kg·K |
| Modulus of Elasticity | 205 GPa |
EN30B Alloy Steel Forging Properties:
EN30B can be forged at temperatures ranging from 850°C to 1150°C. After forging, the material should be cooled slowly in the furnace or sand to avoid the creation of internal stresses and cracking.
EN30B Alloy Steel Stress Relieving:
EN30B should undergo stress-relieving after heavy machining or significant deformation to reduce internal stresses. Stress relieving can be done by heating the steel to 550-650°C, holding it at this temperature for a specified time, and then cooling slowly.
EN30B Alloy Steel Normalizing:
Normalizing of EN30B is performed at a temperature range of 840-880°C followed by air cooling. This process improves mechanical properties and refines the grain structure of the material.
EN30B Alloy Steel Annealing:
EN30B alloy steel is annealed by heating to 820-850°C, soaking until the temperature is uniform, and then slowly cooling in the furnace. This process softens the material and makes it easier to machine.
EN30B Alloy Steel Machinability:
EN30B offers good machinability in the annealed condition. However, due to its high toughness, machining operations such as turning, drilling, and milling should be performed with appropriate tooling and cutting parameters to achieve optimal results.
EN30B Alloy Steel Welding:
Welding of EN30B is not generally recommended due to the high risk of cracking, especially in hardened and tempered conditions. However, if welding is required, preheating to 200-300°C and post-weld heat treatment are recommended to reduce residual stresses and prevent cracking.
EN30B Alloy Steel Applications:
EN30B is used in a variety of high-stress applications across multiple industries:
- Aerospace Components: Landing gear, engine components, and structural parts that must endure high stress and wear.
- Automotive Parts: Gears, shafts, and heavy-duty crankshafts that require excellent toughness and fatigue resistance.
- Engineering Components: High-stress parts such as spindles, axles, and couplings.
- Oil and Gas Industry: Drilling equipment, valve stems, and components that face high wear and tear.
- Tooling: Dies, molds, and other tools subjected to high loads and impacts.
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.
