EN8 Chemical Composition

Understanding the chemical composition of EN8 steel is crucial as it directly influences its mechanical properties. The balance of elements like carbon, manganese, silicon, and others determines the material’s strength, hardness, toughness, and weldability. This makes it an ideal choice for various industrial applications where performance and durability are key factors.

Table of contents

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

EN8 Chemical Composition

EN8 is a medium carbon steel that offers a good balance of strength and machinability. Below is the detailed breakdown of its chemical composition:

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

EN8 Steel Mechanical Properties

The mechanical properties of EN8 steel define its behavior under different loads and conditions. These properties include yield strength, tensile strength, impact resistance, and more. Here's a detailed overview of its mechanical characteristics:

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 Equivalents

EN8 steel has several equivalents in different countries, making it easier to find suitable alternatives or compare with other materials. Here is a list of equivalent grades:

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 heat treatment, which allows it to be used in a wide range of applications. Here is the typical hardness range after different treatments:

Heat Treatment Hardness (HB)
Normalising 152–207
Quenching 179–229
Tempering 201–255

EN8 vs EN9 Steel

EN8 and EN9 are both medium carbon steels, but they differ in their carbon content and resulting 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 at high temperatures to improve its structural integrity and workability. The forging temperature range is typically between 1100°C and 850°C.

Heat Treatment of EN8 Carbon Steel

Proper heat treatment is essential to achieve the desired mechanical properties. Below is the standard heat treatment process for EN8 steel:

Process Temperature
Soft Annealing 680–710°C (furnace)
Normalizing 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 to suit different manufacturing needs:

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

EN8 steel, also known as DIN 1.0511, exhibits good thermal conductivity and expansion properties, making it suitable for applications requiring stability under varying temperatures:

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 reduce internal stresses and improve the material's workability. The recommended annealing temperature for 080M40 steel is 680–710°C.

Surface Finish & Tolerance of C45 Grade

The surface finish and dimensional tolerance of C45 steel play a vital role in determining its suitability for specific applications. Different finishing methods offer varying levels of precision and quality:

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 a critical factor in determining its wear resistance and overall performance. It typically has a minimum hardness of 55 HRC.

Testing Methods for 1045 Steel

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

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

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June 29, 2025