Carbon Steel EN 353 is a low-carbon, nickel-chromium alloyed case-hardening steel primarily designed for components that require a tough core combined with a hard, wear-resistant surface. Produced in accordance with EN 10084 specifications, EN 353 is well known for its excellent response to carburizing or carbonitriding heat treatments, which significantly enhance surface hardness while maintaining good core toughness and shock resistance. Its controlled alloying elements improve hardenability and ensure consistent mechanical properties after heat treatment.
With good machinability in the soft annealed condition and excellent dimensional stability after case hardening, Carbon Steel EN 353 is ideally suited for precision mechanical parts subjected to repeated stress and wear. It is widely used in gears, shafts, pinions, cams, bushes, and transmission components where surface durability and fatigue resistance are critical. Carbon Steel EN 353 remains a preferred material for automotive, industrial machinery, and engineering applications that demand long service life, reliability, and consistent performance under cyclic loading.
Preferred for heavy-duty automotive and industrial parts
CARBON STEEL EN 353 ROUND BAR EQUIVALENT GRADES
STANDARD
EN
DIN
IS
ASTM / AISI
Carbon Steel EN 353
EN 10084 EN 353
DIN 1.7131
IS 1570 (20MnCr5)
AISI 5120
SPECIFICATION OF CARBON STEEL EN 353 ROUND BAR
Size
22 mm up to 800 mm
Thickness
1 – 2 inch
Length
3 meter, 6 meter
Form
Carbon Steel Round, Hex, Flat, Half Round, Oval, Rectangular
in Black & Bright Finish
CHEMICAL COMPOSITION OF CARBON 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 CARBON STEEL EN 353 ROUND BAR
Grade
Tensile Strength (MPa) min
Yield Strength 0.2% Proof (MPa) min
Elongation (% in 50 mm) min
Carbon Steel EN 353
551
241
30
💡 Practical Difference in Use
Use Carbon Steel EN 353 Round Bars when: a combination of surface hardness and core toughness is required for components subjected to wear, repeated loading, and impact. EN 353 is a case-hardening grade that performs best after carburizing or carbonitriding, making it suitable for parts that need a hard outer layer with a tough inner core.
→ Example: gears, pinions, shafts, cams, and transmission components.
Bright Finished / Machined Carbon Steel EN 353 Round Bars when: accurate dimensions, smooth surface finish, and consistent machining behavior are required before heat treatment.
→ Example: precision gears, machined shafts, bushes, and wear-resistant mechanical parts.
Applications of Carbon Steel EN 353 Round Bars
Carbon Steel EN 353 round bars are selected for applications where surface wear resistance, fatigue strength, and long service life are more important than general structural strength.
Automotive & Transmission: Gears, pinions, shafts, and drivetrain components.
General Engineering: Cams, bushes, spindles, and wear parts.
Industrial Machinery: Case-hardened components exposed to cyclic loads.
When to Choose Carbon Steel EN 353 Round Bars?
Material selection depends on heat treatment requirements, wear resistance, fatigue life, and machining needs before case hardening.
Choose Carbon Steel EN 353 Round Bars when:
Case-hardening is required for surface durability
Good core toughness is needed to absorb shock loads
Components are subjected to wear and fatigue
Used in gears, shafts, and transmission systems
Machining is done prior to heat treatment
Long service life is critical
Bright / Machined Carbon Steel EN 353 Round Bars are preferred when:
Close dimensional tolerances are required
Smooth surface finish is important before carburizing
Precision turning, drilling, or milling is involved
Consistent microstructure is needed for heat treatment
Used in precision automotive or machinery parts
Uniform hardness after case hardening is desired
Industries That Use Carbon Steel EN 353 Round Bars
Carbon Steel EN 353 round bars are widely used in industries that require high wear resistance, fatigue strength, and reliable performance after heat treatment.
Automotive Industry
Used in high-wear, rotating, and transmission parts.
Uses
Gears, pinions, shafts, drivetrain components.
Why Carbon Steel EN 353?
Excellent case-hardening response and fatigue resistance.
Industrial Machinery
Used in wear-resistant mechanical assemblies.
Uses
Cams, spindles, bushes, machine parts.
Why Carbon Steel EN 353?
Tough core with a hard, durable surface.
General Engineering
Used in precision and fatigue-loaded components.
Uses
Wear parts, shafts, precision assemblies.
Why Carbon Steel EN 353?
Consistent performance after carburizing.
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