Ventura Alloy And Steels Private Limited

100Cr6 Bearing Steel Round Bars – Material Description

100Cr6 is a high-carbon chromium alloy steel designed for bearings and high-wear applications. It is renowned for its high hardness, excellent wear resistance, high fatigue strength, and dimensional stability after heat treatment. This grade is widely used in ball and roller bearings, precision shafts, spindles, and heavy-duty machine components.

It is equivalent to EN31 / AISI 52100 / SAE 52100 / JIS SUJ2, a globally trusted grade in bearing and automotive industries.

Chemical Composition (Typical %) Mechanical Properties Available Sizes of Round Bars

• Hot Rolled / As Rolled: 16 mm – 200 mm dia

• Peeled / Turned / Ground: 12 mm – 120 mm dia (tight tolerances, bright surface)

• Forged Round Bars: 150 mm and above for custom shafts and heavy-duty parts

Heat Treatment

• Annealed Condition: Soft, machinable (~200 HB)

• Hardened & Tempered: Quench at 840–860°C (oil or polymer), temper at 150–200°C to 58–62 HRC

• Stress Relieving: After rough machining, before final hardening

Key Features

• High wear resistance and surface hardness

• Excellent toughness and fatigue strength

• Maintains dimensional stability after heat treatment

• Machinable in annealed condition

Applications

• Bearings: Ball, roller, needle bearings, bearing races

• Automotive: Gear pins, shafts, CV joints, engine components

• Tooling & Dies: Spindles, punches, wear-resistant parts

• Hydraulic & Machinery: Piston rods, guide pins, heavy-duty shafts

Equivalent Grades

• EN / IS: EN31 / 100Cr6

• AISI / SAE: 52100

• JIS: SUJ2

EN31 Round Bars – Material Description

EN31 is a high-carbon chromium alloy steel known for its high hardness, excellent wear resistance, and high fatigue strength. It retains dimensional stability after heat treatment and is widely used for high-precision, wear-resistant components such as bearings and shafts.

Equivalent to AISI 52100 / SAE 52100 / 100Cr6, EN31 is typically supplied in round bar form for machining into critical parts requiring superior surface hardness and durability.

Chemical Composition (Typical %) Available Sizes of Round Bars

Hot Rolled (Annealed) Round Bars

• Sizes: 16 mm to 200 mm dia

• Condition: Annealed (for machining and further hardening)

Peeled / Turned / Ground Round Bars

• Sizes: 12 mm to 120 mm dia

• Condition: Peeled, straightened, and tight tolerance

• Surface Finish: Bright (suitable for precision components)

Forged Round Bars

• Sizes: 150 mm and above

• Application: Custom sizes for shafts and heavy machinery parts

Mechanical Properties (After Heat Treatment) Heat Treatment Response

Annealed Condition:

• Soft for machining (approx. 200 HB)

Hardened & Tempered Condition:

• Quenching at 840–860°C in oil or polymer

• Tempering at 150–200°C to achieve 60–65 HRC

Stress Relieving:

• Done after rough machining and before final hardening

Typical Applications

Bearings:

• Ball & roller bearings, bearing races, needle bearings

Automotive:

• Gear pins, transmission shafts, CV joints, engine parts

Tooling & Dies:

• Punches, spindles, wear-resistant tools

Machinery & Hydraulics:

• Piston rods, guide pins, heavy-duty shafts

Product Condition & Supply Form Key Advantages

✅ Excellent hardness and wear resistance
✅ High fatigue and impact strength
✅ Good machinability in annealed condition
✅ Trusted, industry-standard grade for bearing and automotive applications

EN24 steel (also designated SAE 4340, AISI 4340, or 34CrNiMo6 in European standards) is a medium carbon, low-alloy high-strength steel containing nickel, chromium, and molybdenum. This alloying mix gives the steel a strong balance of high tensile strength, toughness, fatigue resistance, and hardenability — making it suitable for demanding mechanical applications.

Typical Chemical Composition (approx.):

• Carbon (C): ~0.36–0.44%

• Manganese (Mn): ~0.45–0.80%

• Chromium (Cr): ~0.7–1.4%

• Nickel (Ni): ~1.3–2.0%

• Molybdenum (Mo): ~0.20–0.40%

Mechanical Characteristics:

• High tensile strength (can be 850–1080 MPa or higher in heat-treated condition)

• Good toughness and impact resistance

• Excellent hardenability for deep section heat treatment

• Wear resistance and fatigue strength

• Moderate weldability (best with pre- and post-heat treatment)

Forms & Finishes:
EN24 / SAE 4340 round bars are supplied in various surface finishes — hot rolled, bright, peeled, turned, or polished — in diameters typically from small rods up to large engineering bars depending on the mill and customer requirements.

Heat Treatment:

• Supplied in annealed, as-rolled, or quenched & tempered conditions

• Quenching and tempering typically optimize strength and toughness

• Can be surface hardened (induction, nitriding) for wear-resistant parts

🔧 Key Applications of EN24 / SAE 4340 Round Bars

EN24 / SAE 4340 is used wherever high strength, shock resistance, and reliability under stress are required. Typical industries and components include:

🚗 Automotive & Transportation

• Crankshafts and camshafts

• Gears and pinions

• Axles and drive shafts

✈️ Aerospace & Defense

• Landing gear and critical aircraft structural parts

• Rotor hubs and engine components

🛠 Industrial Machinery

• Heavy-duty shafts

• Couplings, spindles, and pins

• Studs, bolts, and fasteners

🛢 Oil & Gas / Offshore

• Drill shafts and downhole tools

• High stress pressure parts

🏗 Heavy Equipment & Construction

• Load-bearing shafts and structural parts in cranes, rolling mills, mining gear, and material-handling machines

⚙️ General Engineering

• Precision machined components

• Tooling components requiring strength + toughness

Why Choose EN24 / SAE 4340 Round Bars

✔ Superior strength and fatigue resistance compared to many carbon steels
✔ Good machinability in annealed condition
✔ Excellent performance after heat treatment
✔ Versatile in heavy-duty and high-stress applications

EN31 Bearing Steel Round Bars – Material Description

EN31 is a high-carbon chromium alloy steel specifically designed for bearings and high-wear applications. It is known for its high hardness, excellent wear resistance, high fatigue strength, and dimensional stability after heat treatment. EN31 is the preferred grade for manufacturing anti-friction bearings, precision shafts, spindles, and heavy-duty machine components.

It is equivalent to AISI 52100 / SAE 52100 / 100Cr6 / JIS SUJ2, widely trusted in bearing and automotive industries worldwide.

Chemical Composition (Typical %) Mechanical Properties Available Sizes of Round Bars

• Hot Rolled / As Rolled: 16 mm – 200 mm dia

• Peeled / Turned / Ground: 12 mm – 120 mm dia (tight tolerances, bright surface)

• Forged Round Bars: 150 mm and above for custom shafts and heavy-duty parts

Heat Treatment

• Annealed Condition: Soft, machinable (~200 HB)

• Hardened & Tempered: Quench at 840–860°C (oil or polymer), temper at 150–200°C to 58–62 HRC

• Stress Relieving: After rough machining, before final hardening

Key Features

• Superior wear resistance and hardness

• Excellent toughness and fatigue strength

• Maintains dimensional stability after heat treatment

• Can be precision-machined in annealed condition

Applications

• Bearings: Ball, roller, needle bearings, bearing races

• Automotive: Gear pins, shafts, CV joints, engine components

• Tooling & Dies: Spindles, punches, wear-resistant parts

• Hydraulic & Machinery: Piston rods, guide pins, heavy-duty shafts

Equivalent Grades

• AISI / SAE: 52100

• DIN: 100Cr6

• JIS: SUJ2

• IS: EN31 / 4398