EN 353

EN 353

Case-Hardening Steel For Demanding Engineering Components

EN 353 is a low-alloy case-hardening steel containing nickel, chromium and molybdenum. It is designed to develop a hard, wear-resistant surface with a tough core, making it suitable for demanding automotive and engineering applications.

Available Forms: Round Bars | Flats | Blocks | Custom Sizes

Key Properties
Built For Surface Hardness. Designed For Core Toughness.

  • High Surface Hardness
  • Tough Core
  • Good Wear Resistance
  • Fatigue Performance
  • Dimensional Stability
  • Engineering Versatility
Category:

Technical Specifications

EN 353 — Technical Specifications

Property Specification
Material EN 353
Steel Type Nickel-Chromium-Molybdenum Case-Hardening Steel
DIN Designation 20NiCrMo5*
Carbon (C) 0.10–0.20%
Silicon (Si) 0.35% Max
Manganese (Mn) 0.50–1.00%
Chromium (Cr) 0.75–1.25%
Nickel (Ni) 1.00–1.50%
Molybdenum (Mo) 0.08–0.15%
Phosphorus (P) 0.035% Max*
Sulphur (S) 0.035% Max*
Available Forms Round Bars, Flats, Blocks*
Supply Full Length / Cut-to-Size

Chemical Composition

Element Composition
Carbon (C) 0.10–0.20%
Silicon (Si) 0.35% Max
Manganese (Mn) 0.50–1.00%
Chromium (Cr) 0.75–1.25%
Nickel (Ni) 1.00–1.50%
Molybdenum (Mo) 0.08–0.15%
Phosphorus (P) 0.035% Max
Sulphur (S) 0.035% Max
Iron (Fe) Balance

 

Applications

Where En 353 Is Used

Gears
For Heavy-duty Power Transmission And Automotive Applications.

Shafts
Suitable For Shafts Exposed To Mechanical Loads And Repeated Stresses.

Pinions
Used In High-load Power-transmission Systems.

Camshafts
Suitable For Automotive And Mechanical Applications Involving Repeated Contact.

Gudgeon Pins
Used In Demanding Automotive Component Applications.

Machining Components
Suitable For Engineered Components Requiring A Hardened Surface And Tough Core.

Heat Treatment

EN 353 is typically processed through carburizing and subsequent hardening/tempering to develop its required case and core properties.

Treatment Typical Range
Soft Annealing 630–670°C
Carburizing Approx. 880–930°C*
Hardening Approx. 840–870°C
Quenching Oil
Tempering 150–200°C

Available Forms

Round Bars
Suitable For Shafts, Gears, pinions, and other machined components.

Flats
For Machining And Specialised Engineering Requirements.

Blocks
Suitable For Manufacturing And Machining Applications.

Custom Sizes
Cut-to-size Material Based On Customer Requirements, Subject To Availability.

Full Length
Material Can Also Be Supplied In Full-length Stock Where Required.

Supply Condition

EN 353 Can Be Supplied In Conditions Suitable For Different Stages Of Manufacturing And Processing.

Annealed
Suitable For Machining And Subsequent Heat Treatment.

Soft Annealed
Used To Reduce Hardness And Improve Machinability.

Carburized
Available As A Heat-treatment Option Where A Hardened Surface Is Required.

Hardened & Tempered
For Applications Requiring Developed Hardness And Mechanical Performance.

Full Length
Available According To Stock And Size Requirements.

Cut-to-size
Prepared According To Specified Dimensions.

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