Understanding the chemical composition of EN8 steel is essential as it directly influences its mechanical properties. Elements such as carbon, manganese, and silicon determine the strength, hardness, toughness, and weldability of the material. This makes the composition a key factor in selecting the right grade for specific applications. EN8 is a medium carbon steel known for its good balance between strength and machinability. The following table shows the typical chemical composition: The mechanical properties of EN8 steel are crucial in determining its suitability for various engineering applications. These include yield strength, tensile strength, impact resistance, and ductility. Here's a detailed overview of the mechanical characteristics under different heat treatment conditions: EN8 steel has several equivalents across different countries and standards, making it easier to identify suitable alternatives based on regional specifications: EN8, also known as 080M40, can be heat-treated to achieve varying levels of hardness depending on the application. The following table shows the hardness values after different treatments: While both EN8 and EN9 are carbon steels, they differ in their carbon content and resulting mechanical properties: EN8 steel is typically forged at temperatures ranging from 1100°C to 850°C. This process enhances its microstructure and improves formability, making it ideal for manufacturing complex shapes and components. Proper heat treatment is essential to achieve the desired mechanical properties. Below are the recommended treatment processes: EN8 steel is available in a wide range of products to suit different industrial needs: Thermal properties play a vital role in the performance of EN8 steel under varying temperature conditions: Annealing is a common process used to relieve internal stresses and improve machinability. The recommended temperature range for annealing 080M40 steel is: The surface finish and dimensional tolerance are critical for ensuring the quality and usability of the final product: S45C steel is known for its high surface hardness, which makes it suitable for wear-resistant applications: To ensure quality and compliance, the following testing methods are commonly applied to 1045 steel: Ink For Tempered Glass Panel,Glass Panel Ink,Screen Printing Ink For Glass,Kitchen Tempered Glass Ink,Glass Bottle Printing Ink Lauer Water-Based New Material(Foshan)Co.,Ltd. , https://www.lauerink.com
Table of contents
EN8 Chemical Composition
EN8 Steel Mechanical Properties
Heat Treatment
Yield Strength (MPa)
Tensile Strength (MPa)
Rp 0.2 (MPa)
Impact (J)
Izod (ft.lb)
KCV (J)
MPa
MPa
MPa
Normalised
280
550
–
15
16
245
510
–
–
–
Quenched
385
625/775
355
25
28
Tempered
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
080M40 Steel Hardness
Heat Treatment
Hardness (HB)
Normalising
152–207
Quenching
179–229
Tempering
201–255
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 EN8 Carbon Steel
Heat Treatment of EN8 Carbon Steel
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 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 455mmDIN 1.0511 Thermal Properties
Thermal Conductivity
Thermal Coefficient
37.5 W/m·K
6.5×10â»â¶ W/m·K
Annealing of 080M40 Grade Steel
Process
Temperature
Annealing
680–710°C
C45 Grade Surface Finish & Tolerance
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
Surface Hardness
Minimum 55 HRC
Testing Method for 1045 Steel
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%
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June 29, 2025