EN8 Chemical Composition

Understanding the chemical composition of EN8 steel is essential because it directly influences its mechanical properties. Elements like carbon, manganese, and silicon determine characteristics such as strength, hardness, toughness, and weldability. A well-balanced composition ensures that the material performs reliably in various industrial applications.

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 steel is a medium-carbon steel known for its balanced mechanical properties. Its composition includes carbon, manganese, silicon, sulfur, phosphorus, and iron. Each element plays a vital role in defining the overall performance of the material.

Carbon
0.36–0.44%
Silicon
0.10–0.40%
Manganese
0.60–1.00%
Sulfur
0.05 Max
Phosphorus
0.05 Max
Iron
97.75 to 98.05%

EN8 Steel Mechanical Properties

The mechanical properties of EN8 steel are crucial for determining its suitability in different engineering applications. These properties include yield strength, tensile strength, impact resistance, and ductility. The values can vary depending on the heat treatment applied to the material.

Heat Treatment Yield Strength (MPa) Tensile Strength (MPa) Rp 0.2 (MPa) Impact
Izod (ft.lb) KCV (J)
N 280 550 – 15 16
245 510 – – –
Q 385 625/775 355 25 28
R 465 700/850 450 25 28

EN8 Material Equivalent

EN8 steel has several equivalents across different standards, making it easier to identify suitable alternatives based on regional or application-specific requirements.

Country British USA Australia Japan
Standard EN 10083-2 ASTM A29 AS 1442 JIS G4051
Grades C45 / 1.1191 1045 1045 S45C

Hardness of 080M40 Steel

The hardness of 080M40 steel can be adjusted through various heat treatment processes, making it adaptable for different applications. Here are the typical hardness values after each process:

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 carbon content and resulting mechanical properties:

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 at temperatures ranging from 1100°C to 850°C. This process helps improve the microstructure and enhance the material's mechanical properties.

Heat Treatment of EN8 Carbon Steel

Proper heat treatment is essential to achieve the desired mechanical properties in EN8 steel. The following are the standard treatments:

Heat Treatment 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 wide range of forms and sizes, making it suitable for various industrial applications:

EN8 Steel Plate and Sheet
Strips Thickness: 0.4mm – 4mm
Sheets (Cold Rolled) Thickness: 0.4mm – 4mm
Sheets (Hot Rolled) Thickness: 2.7mm – 12mm
Plates Thickness: 16mm – 150mm
Heavy Plates Thickness: 16mm – 350mm
1045 Steel Round Bar
Rolled Round Bar Diameter: 16mm – 250mm
Heavy Forged Round Diameter: 200mm – 450mm
Heavy Machined Round Diameter: 260mm – 620mm
Heavy Ship Shafts Diameter: 450mm – 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

Thermal Properties of DIN 1.0511

The thermal properties of EN8 steel, such as thermal conductivity and thermal expansion, make it suitable for applications involving temperature variations:

Thermal Conductivity Thermal Coefficient
37.5 W/m K 6.5e-6 W/m K

Annealing of 080M40 Grade Steel

Annealing is a common process used to relieve internal stresses and improve machinability. For 080M40 steel, the recommended annealing temperature is between 680°C and 710°C.

C45 Grade Surface Finish & Tolerance

The surface finish and tolerance of C45 steel play a critical role in its final application. Different finishes are available to meet specific design and performance requirements:

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 around 55 HRC, which makes it suitable for applications requiring high wear resistance and durability.

Testing Methods for 1045 Steel

To ensure the quality and reliability of 1045 steel, the following testing methods are commonly used:

  • Corrosion Testing
  • Chemical Composition Analysis
  • Tensile Strength Test
  • Ultrasonic Testing
  • Visual Inspection
  • Bend Test

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