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EN8 Chemical Composition

Understanding the chemical composition of EN8 steel is essential because it directly influences the material’s properties such as strength, hardness, toughness, and weldability. These characteristics largely depend on the precise ratios and types of elements present in its composition.

Table of Contents

  • EN8 Chemical Composition
  • EN8 Steel Mechanical Properties
  • EN8 Material Equivalent
  • 080M40 Steel Hardness
  • EN8 vs EN9 Steel
  • Forging of Carbon Steel Grade EN8
  • Heat Treatment of EN8 Carbon Steel
  • Product Range of EN8 Steel
  • DIN 1.0511 Thermal Properties
  • Annealing of 080M40 Steel
  • C45 Grade Surface Finish & Tolerance
  • Surface Hardness of S45C Steel
  • Testing Methods for 1045 Steel

EN8 Chemical Composition

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

Equivalent Properties of 080M40 Steel

The mechanical properties of EN8 steel are critical as they define its strength, tensile capabilities, and durability. The yield strength, tensile strength, and impact strength play a vital role in determining how well the material performs under various conditions. This allows manufacturers and engineers to select the most suitable material for specific applications.

Material equivalents provide a universal understanding of the steel’s identity across different regions and standards.

Mechanical Properties of EN8 Steel

Heat Treatment Yield Strength Rm Tensile Strength Rm Rp 0.2 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 Equivalents

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

1045 Steel is Easily Machinable, Refer DIN 1.0511 Hardness

The composition of 1045 steel offers excellent hardness and machining capabilities. This highlights that 080M40 steel can adjust its overall hardness through different heat treatment processes, making it highly versatile. This adaptability allows manufacturers and fabricators to modify its properties to meet specific application requirements, enhancing performance and durability.

Hardness of 080M40 Steel

Heat Treatment Hardness
HB
Normalizing 152/207
146/197
Quenching 179/229
Tempering 201/255

Comparison: EN8 vs EN9 Steel

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 Carbon Steel Grade EN8

Forging or Hot Rolling 1100 – 850°C

Carbon Content of S45C Steel is Between 0.36-0.44%, View EN8 Grade Heat Treatment

Please note the percentage of carbon can vary slightly based on the specific application needs.

Heat treatment is essential to achieve desired mechanical properties. Below are the key heat treatment processes:

  • Soft annealing is performed on previously hardened steel to soften it.
  • Normalizing refines grain structure and enhances machinability.
  • Hardening increases the hardness of the material’s surface.
  • Tempering reduces brittleness from the hardening process, improving toughness and ductility.

Heat Treatment of EN8 Carbon Steel

Soft Annealing 680 – 710°C (in furnace)
Normalizing 840 – 880°C (in air)
Hardening 820 – 860°C (in water/oil)
Tempering 550 – 660°C (in air)

Available Product Range of EN8 Steel

EN8 Steel Plates and Sheets
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 Bars
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 Bars
Rolled Flat Bar Thickness: Up to 50mm
Width: Up to 455mm
Forged Flat Bar Thickness: Up to 305mm
Width: Up to 455mm
EN8 Steel is Ideal for Industrial Applications, Explore Thermal Properties of 080M40 Steel

EN8 steel is ideal for industrial use due to its excellent strength, machinability, and durability. Additionally, it possesses superior thermal properties, enhancing its versatility in applications requiring precise material characteristics. This ensures outstanding performance in varying thermal conditions within an industrial setting.

Thermal Properties of DIN 1.0511

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

Annealing of 080M40 Steel

Annealing Temperature 680-710°C

Surface Finish & Tolerance of C45 Steel

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
C45 Steel Can Be Used in High-Temperature Conditions, Refer to EN8 Grade Steel Surface Finish

The surface finish and tolerance are critical parameters that determine the suitability of the material for various applications. Manufacturers can make informed decisions based on these specifications. Proper detailing of surface finish and tolerance ensures optimal performance, durability, and longevity of the final product.

Surface Hardness of S45C Steel

Surface Hardness Minimum 55 HRC

Testing Methods for 1045 Steel

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