Understanding the chemical composition of EN8 steel is crucial for determining its performance in various applications. The elements present in EN8—such as carbon, manganese, silicon, and others—play a significant role in defining its mechanical properties, including strength, hardness, toughness, and weldability. This makes it a popular choice in industrial settings where reliability and durability are key factors.
Table of contents
- EN8 chemical composition
- EN8 steel mechanical properties
- EN8 material equivalent
- 080M40 steel Hardness
- EN8 Vs EN9 Steel
- Carbon Steel Grade EN8 Forging
- Heat Treatment of EN8 Carbon Steel
- Available product range of EN8 steel
- DIN 1.0511 Thermal Properties
- Annealing of 080M40 grade steel
- C45 grade Surface Finish & Tolerance
- Surface hardness of S45C steel
- Testing method for 1045 steel
EN8 Chemical Composition
EN8 is a medium carbon steel known for its balance between strength and machinability. Its chemical composition plays a vital role in determining how it behaves under different conditions. Below is a breakdown of the main components:
EN8 Steel Mechanical Properties
The mechanical properties of EN8 steel define its ability to withstand stress, impact, and deformation. These properties are essential for engineers and manufacturers to determine the best use case for this material. Here’s a detailed look at the mechanical characteristics of EN8 steel:
| Heat Treatment | Yield Strength (MPa) | Tensile Strength (MPa) | Rp 0.2 (MPa) | Impact | |
|---|---|---|---|---|---|
| Izod (ft.lb) | KCV (J) | ||||
| MPa | MPa | MPa | |||
| N | 280 | 550 | – | 15 | 16 |
| 245 | 510 | – | – | – | |
| Q | 385 | 625/775 | 355 | 25 | 28 |
| R | 465 | 700/850 | 450 | 25 | 28 |
EN8 Material Equivalent
Understanding the equivalent grades of EN8 steel helps in selecting the right material based on regional standards and application requirements. Below is a comparison of EN8 with other international standards:
| Country | British | USA | Australia | Japan |
|---|---|---|---|---|
| Standard | EN 10083-2 | ASTM A29 | AS 1442 | JIS G4051 |
| Grades | C45 / 1.1191 | 1045 | 1045 | S45C |
080M40 Steel Hardness
The hardness of 080M40 steel can be adjusted through different heat treatment processes, making it suitable for a wide range of applications. Here are the typical hardness values after various treatments:
| Heat Treatment | Hardness (HB) |
|---|---|
| Normalising | 152–207 |
| Quenching | 179–229 |
| Tempering | 201–255 |
EN8 vs EN9 Steel
While both EN8 and EN9 are medium carbon steels, they differ in their composition and mechanical properties. Here's a comparison:
| Properties | EN8 | EN9 |
|---|---|---|
| Carbon Content | 0.36–0.44% | 0.50–0.60% |
| Hardness | Up to 207 HBW | Up to 255 HBW |
| Tensile Strength | ≥540 MPa | ≥695 MPa |
Forging of EN8 Carbon Steel
EN8 steel is commonly forged or hot rolled within the temperature range of 1100°C to 850°C, ensuring proper grain structure and mechanical properties for further processing.
Heat Treatment of EN8 Carbon Steel
Proper heat treatment is essential to achieve the desired mechanical properties. Here are the recommended steps:
| Process | Temperature |
|---|---|
| Soft Annealing | 680–710°C (furnace) |
| Normalising | 840–880°C (air) |
| Hardening | 820–860°C (water, oil) |
| Tempering | 550–660°C (air) |
Available Product Range of EN8 Steel
EN8 steel is available in a variety of forms and sizes, making it suitable for different industrial applications:
| EN8 Steel Plate and Sheet | |
|---|---|
| Strips | Thickness: 0.4mm to 4mm |
| Sheets (Cold Rolled) | Thickness: 0.4mm to 4mm |
| Sheets (Hot Rolled) | Thickness: 2.7mm to 12mm |
| Plates | Thickness: 16mm to 150mm |
| Heavy Plates | Thickness: 16mm to 350mm |
| 1045 Steel Round Bar | |
| Rolled Round Bar | Diameter: 16mm to 250mm |
| Heavy Forged Round | Diameter: 200mm to 450mm |
| Heavy Machined Round | Diameter: 260mm to 620mm |
| Heavy Ship Shafts | Diameter: 450mm to 1000mm |
| S45C Flat Bar | |
| Rolled Flat Bar | Thickness: Up to 50mm Width: Up to 455mm |
| Forged Flat Bar | Thickness: Up to 305mm Width: Up to 455mm |
DIN 1.0511 Thermal Properties
The thermal properties of EN8 steel make it suitable for environments that require stability under varying temperatures:
| Thermal Conductivity | Thermal Coefficient |
|---|---|
| 37.5 W/m K | 6.5 × 10â»â¶ W/m K |
Annealing of 080M40 Grade Steel
Annealing is performed at a temperature range of 680–710°C to improve machinability and reduce internal stresses.
C45 Grade Surface Finish & Tolerance
The surface finish and tolerance of C45 steel are critical for its suitability in specific applications. Here are the standard tolerances:
| Surface Finish | Turned | Black-Rolled | Polished | Grinding | Cold Drawn | Black-Forged | Peeled |
|---|---|---|---|---|---|---|---|
| Tolerance | (0, +3mm) | (0, +1mm) | Best h11 | Best h9 | Best H11 | (0, +5mm) | Best H11 |
Surface Hardness of S45C Steel
The surface hardness of S45C steel is typically a minimum of 55 HRC, making it ideal for high-stress applications.
Testing Methods for 1045 Steel
To ensure quality and performance, 1045 steel undergoes several testing procedures, including:
- Corrosion Testing
- Chemical Composition Analysis
- Tensile Strength Test
- Ultrasonic Testing
- Visual Inspection
- Bend Test
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