EN19 Alloy Steel Round Bar: Complete Guide for SEO Optimization
EN19 Alloy Steel Round Bar is a versatile, high-strength engineering material used across a wide range of industries. Known for its combination of toughness, wear resistance, and high tensile strength, EN19 is a popular choice for components that undergo high stress and heavy loads. This guide covers everything you need to know about EN19 round bars, from technical specifications and grades to applications and available sizes.
What is EN19 Alloy Steel Round Bar?
EN19 Alloy Steel, also known as 42CrMo4, is an alloy of carbon, chromium, and molybdenum. It is renowned for its excellent mechanical properties, especially when it comes to strength, toughness, and wear resistance. This makes it a popular material for manufacturing critical components in high-stress environments.
Chemical Composition of EN19 Alloy Steel
The composition of EN19 steel includes:
- Carbon (C): 0.36-0.44%
- Chromium (Cr): 0.90-1.20%
- Manganese (Mn): 0.60-0.90%
- Molybdenum (Mo): 0.15-0.30%
- Silicon (Si): 0.10-0.35%
This specific alloy composition gives EN19 its high strength, good ductility, and excellent resistance to wear and fatigue.
Key Mechanical Properties of EN19 Round Bar
- Tensile Strength: 850-1000 N/mm²
- Yield Strength: 680-880 MPa
- Hardness: 248-302 HB (after heat treatment)
- Elongation: 11-15%
- Impact Resistance: Excellent, particularly when tempered
- Machinability: Good in annealed condition
- Weldability: Requires preheating due to its high carbon content
EN19 Alloy Steel Round Bar Heat Treatment
EN19 steel is typically supplied in the quenched and tempered condition to optimize its mechanical properties. Key heat treatment processes include:
- Hardening: Heat to 840-870°C, then quench in oil to achieve high hardness.
- Tempering: For increased toughness, tempering is conducted between 550°C and 700°C.
- Annealing: To improve machinability, EN19 can be annealed by heating to 680-710°C and slowly cooling.
Applications of EN19 Alloy Steel Round Bar
Thanks to its high tensile strength and resistance to fatigue, EN19 round bars are widely used in various industries. Here’s a detailed look at its applications:
| Industry | Application | Reason for Use |
|---|---|---|
| Automotive | Shafts, axles, gears, engine parts | High tensile strength, toughness, wear resistance |
| Mechanical | Machine tool spindles, bolts, high-stress parts | Fatigue resistance, machinability |
| Oil & Gas | Drill collars, rotary shafts, piping components | High strength, corrosion resistance |
| Power Transmission | Gears, crankshafts, power transmission components | Resistance to wear and dynamic loads |
| Aerospace | Engine components, fasteners, landing gear parts | Light weight, strength, and toughness |
| Construction | Heavy-duty structural parts, bridges | Load-bearing capacity, toughness |
Grades and Variants of EN19 Alloy Steel Round Bar
EN19 steel is available in several grades depending on the specific mechanical and chemical requirements. Below are the different grades along with their key characteristics:
| Grade | Standard | Tensile Strength | Hardness | Typical Applications |
|---|---|---|---|---|
| EN19 | BS 970: 1991, 42CrMo4 | 850-1000 N/mm² | 248-302 HB | General engineering, shafts, gears |
| EN19T | Tempered EN19 | 1000-1200 N/mm² | 280-320 HB | Higher strength, used in demanding applications |
| EN19A | Annealed EN19 | Lower tensile strength | 180-240 HB | Easier to machine, suitable for custom parts |
Key Features of EN19 Alloy Steel Round Bar
- High Tensile Strength: EN19 offers excellent tensile strength, making it suitable for high-stress applications.
- Durability: Its superior wear and fatigue resistance extend the lifespan of components, especially under dynamic loads.
- Toughness: Even after tempering, EN19 maintains its toughness, making it ideal for heavy-duty machinery.
- Machinability: EN19 is easy to machine in its annealed form, allowing for custom shaping and precision engineering.
- Versatility: Its wide range of applications makes EN19 a versatile choice for various industries, including automotive, aerospace, and construction.
Common Sizes and Availability of EN19 Round Bar
EN19 Alloy Steel Round Bars are available in a variety of sizes and finishes to meet the needs of different applications. Some common sizes include:
| Diameter (mm) | Length (mm) |
|---|---|
| 10 mm | 6000 mm |
| 20 mm | 6000 mm |
| 50 mm | 6000 mm |
| 100 mm | 6000 mm |
| 200 mm | 6000 mm |
Custom sizes and lengths are available upon request.