Alloy Steel EN 353 is a nickel-chromium alloy case-hardening steel engineered for components that demand a hard, wear-resistant surface combined with a tough and resilient core. Supplied in accordance with EN 10084 standards, EN 353 derives its performance from controlled alloying additions of nickel and chromium, which enhance hardenability, fatigue strength, and resistance to impact after carburizing or carbonitriding heat treatment. This combination allows the steel to achieve high surface hardness while preserving core toughness and dimensional stability.
With good machinability in the annealed condition and excellent performance after heat treatment, Alloy Steel EN 353 is ideally suited for high-duty mechanical and power-transmission components. It is extensively used in gears, pinions, shafts, cams, sprockets, and automotive drivetrain parts where repeated loading, surface wear, and shock resistance are critical. Owing to its reliable heat-treatment response, long service life, and consistent mechanical properties, Alloy Steel EN 353 remains a preferred material for precision engineering and heavy-duty industrial applications.
Forged bars with refined grain and improved fatigue strength
High resistance to shock and cyclic loading
Reliable performance in demanding service conditions
Preferred for automotive and heavy engineering components
ALLOY STEEL EN 353 ROUND BAR EQUIVALENT GRADES
STANDARD
EN
DIN
IS
AISI / SAE
Alloy Steel EN 353
EN 10084 EN 353
1.7131 (20MnCr5)
IS 1570 (20MnCr5)
AISI 5120
SPECIFICATION OF ALLOY STEEL EN 353 ROUND BAR
Size
22 mm up to 800 mm
Thickness
1 – 2 inch
Length
3 meter, 6 meter
Form
Alloy Steel Round, Hex, Flat, Half Round, Oval, Rectangular
in Black & Bright Finish
CHEMICAL COMPOSITION OF ALLOY STEEL EN 353 ROUND BAR
Grade
C
Mn
Si
S
P
Cr
Ni
EN 353
0.35 – 0.45
0.60 – 1.00
0.10 – 0.35
0.050 max
0.050 max
—
—
MECHANICAL PROPERTIES OF ALLOY STEEL EN 353 ROUND BAR
Grade
Tensile Strength (MPa) min
Yield Strength 0.2% Proof (MPa) min
Elongation (% in 50 mm) min
Alloy Steel EN 353
551
241
30
💡 Practical Difference in Use
Use Alloy Steel EN 353 Round Bars when: components must withstand high surface wear, repeated loading, and impact while maintaining a tough and resilient core. Alloy Steel EN 353 is a nickel-chromium alloy case-hardening steel that offers superior hardenability and fatigue strength compared to plain carbon grades, especially after carburizing or carbonitriding.
→ Example: high-duty gears, pinions, transmission shafts, cams, and power-train components.
Bright Finished / Machined Alloy Steel EN 353 Round Bars when: close dimensional accuracy, smooth surface quality, and predictable machining behavior are required before heat treatment.
→ Example: precision gear blanks, machined shafts, bushings, and critical wear-resistant parts.
Applications of Alloy Steel EN 353 Round Bars
Alloy Steel EN 353 round bars are selected for applications where high surface hardness, excellent fatigue resistance, and long service life are essential under demanding operating conditions.
Automotive & Power Transmission: Gears, pinions, shafts, sprockets, and drivetrain components.
Heavy Engineering: Cams, couplings, spindles, and wear-critical machine parts.
Industrial Machinery: Case-hardened components exposed to cyclic and shock loads.
When to Choose Alloy Steel EN 353 Round Bars?
Material selection depends on required surface hardness, fatigue life, impact resistance, and the need for reliable heat-treatment response.
Choose Alloy Steel EN 353 Round Bars when:
High wear resistance after case hardening is required
Excellent fatigue strength under cyclic loading is critical
Tough core strength is needed to resist shock and impact
Used in high-duty automotive and industrial components
Consistent heat-treatment response is essential
Long service life and reliability are priorities
Bright / Machined Alloy Steel EN 353 Round Bars are preferred when:
Tight dimensional tolerances are required before heat treatment
Smooth surface finish improves machining accuracy
Precision turning, milling, or drilling is involved
Uniform microstructure is important for carburizing
Used in precision gears, shafts, and transmission parts
Controlled distortion after heat treatment is needed
Industries That Use Alloy Steel EN 353 Round Bars
Alloy Steel EN 353 round bars are widely used in industries that demand high wear resistance, fatigue strength, and dependable performance in critical mechanical systems.
Automotive & Powertrain
Used in heavily loaded and rotating components.
Uses
Gears, pinions, shafts, transmission components.
Why Alloy Steel EN 353?
Superior case-hardening response and fatigue resistance.
Heavy Engineering
Used in wear-critical and impact-loaded machinery parts.
Uses
Cams, couplings, spindles, engineered components.
Why Alloy Steel EN 353?
Tough core strength with a hard, durable surface.
Industrial Machinery
Used in high-duty mechanical assemblies.
Uses
Wear parts, shafts, precision machine components.
Why Alloy Steel EN 353?
Reliable performance under cyclic and shock loading.
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