Chrome Moly EN24 Alloy Steel Bars

Name: Chrome Moly EN24 Alloy Steel Bars
Brand: JAYANT IMPEX
Price: 76.0 INR
Availability: InStock

76.0 INR/Kilograms

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Product Details:

Type Round Bar / Rod
Application Engineering, Automotive, Aerospace, Transmission Shafts, Gears, Bolts, Fasteners
Technique Hot Rolled / Cold Drawn
Specific Use High tensile applications, Machined Components
Diameter 16mm - 300mm
Material Chrome Moly EN24 Alloy Steel
Tolerance H8, H9, H10 (as per requirement)
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Chrome Moly EN24 Alloy Steel Bars Price And Quantity

Price 76.0 INR/Kilograms
Minimum Order Quantity 1 Kilograms

Chrome Moly EN24 Alloy Steel Bars Product Specifications

Standard BS 970, AISI 4340, EN24, DIN 1.7218
Processing Forged, Rolled, Heat Treated, Annealed
Length 2 meters to 6 meters (custom lengths available)
Grade EN24, 817M40, 1.7218, 34CrNiMo6
Finish Bright, Black, Peeled, Polished
Tolerance H8, H9, H10 (as per requirement)
Specific Use High tensile applications, Machined Components
Diameter 16mm - 300mm
Technique Hot Rolled / Cold Drawn
Material Chrome Moly EN24 Alloy Steel
Application Engineering, Automotive, Aerospace, Transmission Shafts, Gears, Bolts, Fasteners
Type Round Bar / Rod

Machinability Good
Surface Condition Smooth, free from laps and cracks
Impact Value 50 Joules min at -46C
Ultimate Tensile Strength 1000 MPa min
Available Forms Bars, Rods, Cut Pieces
Heat Treatment Annealed, Normalized, Quenched & Tempered
Hardness 28-34 HRC (can be supplied as hardened & tempered)
Elongation 13% min
Yield Strength 850 MPa min
Corrosion Resistance Moderate (coating available upon request)

Product Description

EN24 (defined under the British standard BS 970 as 817M40) is a highly popular, high-tensile alloy steel. While often grouped broadly under "chrome-moly" due to its chromium and molybdenum content, it is more accurately classified as a Nickel-Chromium-Molybdenum (Ni-Cr-Mo) steel.

The addition of nickel gives it significantly better through-hardening properties and core toughness compared to standard chrome-moly grades like 4140 (EN19), making it the go-to choice for heavy-duty components operating under severe stress.

Global Equivalents

When cross-referencing across international material tracking systems, EN24 lines up closely with these major specifications:

USA (AISI/SAE): 4340
Germany (DIN / WNr): 34CrNiMo6 / 1.6582
Europe (EN): 34CrNiMo6 or 817M40
Japan (JIS): SNCM439
France (AFNOR): 35NCD6

Chemical Composition (Typical %)

The balanced chemistry of EN24 allows it to retain high shock resistance and ductility even at high tensile strengths.

Carbon (C)	Chromium (Cr)	Nickel (Ni)	Molybdenum (Mo)	Manganese (Mn)	Silicon (Si)
0.36% 0.44%	1.00% 1.40%	1.30% 1.70%	0.20% 0.35%	0.45% 0.70%	0.10% 0.35%

Mechanical Properties (Condition T)

EN24 bars are most commonly supplied in the "Condition T" heat-treated state (hardened and tempered to a tensile range of 8501000 MPa), offering an optimal blend of strength and machinability.

Tensile Strength: 850 1000 MPa (N/mm)
Yield Strength: 650 MPa
Elongation: 13%
Impact Strength (Izod): 47 J
Hardness: 248 302 HB

Key Technical Characteristics

Through-Hardening: Due to the nickel content, large section sizes can be hardened uniformly to the core via oil quenching, avoiding the soft centers common in lower alloy steels.
Machinability: In its pre-hardened state (Condition T), it machines relatively well with standard carbide tooling.
Nitridation/Induction: Excellent response to surface hardening techniques if you need an incredibly wear-resistant skin (reaching up to 60-65 HRC) while maintaining a tough, flexible core.

Common Industrial Applications

Because it handles combinations of high load, wear, and shock beautifully, you will typically find EN24 bars used for:

High-torque crankshafts, axles, and steering knuckles.
Heavy-duty power transmission gears, pinions, and splined shafts.
Structural bolts, specialized high-tensile fasteners, and heavy clamping hardware.
Drill stems and retaining blocks for oil and gas tooling.

Exceptional Mechanical Properties for Demanding Applications

EN24 steel bars combine high yield (850 MPa) and tensile strength (1000 MPa) with a minimum elongation of 13% and robust impact resistance (50 Joules at -46C). This makes them suitable for components exposed to heavy loads and high stress, such as transmission shafts, gears, and fasteners in critical industries.

Versatile Processing and Finishing Options

Available in forged, rolled, and heat-treated conditions-including annealed, normalized, quenched, and tempered-EN24 bars offer versatility to meet varied industry specifications. Customers can choose from bright, black, peeled, and polished surface finishes, with tight tolerances (H8, H9, H10) ensuring consistent quality.

Tailored Solutions and Industry Standards

Manufactured to comply with BS 970, AISI 4340, EN24, and DIN 1.7218 standards, Chrome Moly EN24 Alloy Steel Bars can be provided in custom sizes and lengths. With coatings for enhanced corrosion resistance available upon request, these bars are supplied across India by leading dealers, exporters, fabricators, and manufacturers.

FAQ's of Chrome Moly EN24 Alloy Steel Bars:

Q: How are EN24 Alloy Steel Bars typically processed to achieve high hardness and strength?

A: EN24 Alloy Steel Bars can be supplied in hardened and tempered, annealed, or normalized conditions. Through processes like forging, rolling, heat treatment (quenching and tempering), the bars attain a hardness of 28-34 HRC and superior mechanical strength, making them fit for demanding applications.

Q: What applications are most suited for Chrome Moly EN24 Steel Bars?

A: Due to their high tensile strength, impact resistance, and good machinability, EN24 bars are commonly used in engineering, automotive, and aerospace sectors for making transmission shafts, gears, bolts, fasteners, and various machined components requiring high reliability and precision.

Q: When should I consider requesting corrosion-resistant coatings for EN24 steel bars?

A: If the intended application involves exposure to corrosive environments or outdoor service, opting for a protective coating is recommended. While EN24 offers moderate corrosion resistance, coatings further protect the surface and extend service life, which can be requested at the time of order.

Q: Where are Chrome Moly EN24 Alloy Steel Bars manufactured and supplied from?

A: EN24 Alloy Steel Bars are produced and distributed by reputed dealers, exporters, fabricators, manufacturers, producers, retailers, suppliers, and traders across India, ensuring easy accessibility and local support for various industry needs.

Q: What surfaces and tolerances are available for EN24 steel bars?

A: These alloy steel bars are available in smooth, defect-free finishes such as bright, black, peeled, and polished. They can be supplied with precise tolerances-H8, H9, or H10-based on customer requirements, ensuring compatibility with critical and high-precision assembly operations.

Q: How does the machinability of EN24 Alloy Steel benefit fabrication?

A: EN24's good machinability allows for efficient and precise shaping of components, reducing production times and tool wear. This makes it highly advantageous for fabricators producing complex parts or requiring consistent high-quality finishes.

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