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4140 Round Alloy Steel Bars

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MOQ : 100 Kilograms

4140 Round Alloy Steel Bars Specification

Size
Customized sizes, commonly 5.5 mm to 300 mm dia

Hardness
197-255 HB (Brinell) annealed; up to 300 HB hardened

Material Composition %
Cr 0.8-1.1%, Mn 0.75-1.0%, Mo 0.15-0.25%, C 0.38-0.43%, Si 0.15-0.30%

Diameter
12 mm to 300 mm (and above, customized)

Recyclable
Yes

Heat Resistance
Yes

Corrosion Resistant
Moderate (requires additional treatment for high corrosion areas)

Product Form
Round Bar

Width
Customizable as required

Coating Type
Optional (Black, Oiled or as per requirement)

Temper
Annealed, Quenched and Tempered

Tensile Strength
655-1080 MPa (as supplied/heat treated)

Chemical Composition
Chromium (Cr): 0.8-1.1%, Manganese (Mn): 0.75-1.0%, Molybdenum (Mo): 0.15-0.25%, Carbon (C): 0.38-0.43%, Silicon (Si): 0.15-0.30%, Phosphorus (P): 0.035%, Sulfur (S): 0.040%

Product Name
4140 Round Alloy Steel Bars

Steel Type
Alloy Steel

Steel Product Type
Round Bar

Grade
AISI 4140

Thickness
N/A (Round bar - refer diameter)

Shape
Round

Steel Standard
ASTM A29, AISI, SAE, EN/DIN 1.7225

Surface
Black, Bright, Peeled or Polished

Composition
Alloy Steel (Cr-Mo)

Application
Shafts, gears, bolts, axles, machine parts

Dimension (L*W*H)
Custom lengths; typically supplied as per order

Weight
Varies by diameter and length

Color
Grey with green-painted ends (identification marking)

Material Grade
4140

Finish Type
Black, Bright, Peeled, Polished

Usage
Automobile, Machinery, Engineering, Structural Applications

Testing Certification
Mill Test Certificate, Ultrasonic tested on requirement

Minimum Order Quantity
As per supplier - often starts from 1 ton

Impact Toughness
Excellent (Charpy V-notch tested for critical applications)

Weldability
Fair (recommended pre & post heat treatment for welding)

Yield Strength
415-835 MPa (as supplied/heat treated)

Machinability
Good in annealed condition

Heat Treatable
Yes (Quenching, Tempering, Normalizing)

Standard Length
5.5 m / 6 m / 9 m / 12 m or as per order

Formability
Good (especially when annealed)

Density
7.85 g/cm3

4140 Round Alloy Steel Bars Trade Information

Minimum Order Quantity
100 Kilograms

Payment Terms
Cash in Advance (CID)

Supply Ability
5000 Kilograms Per Month

Delivery Time
2-5 Days

Main Domestic Market
All India

About 4140 Round Alloy Steel Bars

Grab Yours now and experience unprecedented performance with 4140 Round Alloy Steel Bars-crafted for heroic durability and unbeatable versatility. These top-tier bars deliver instant savings with customizable lengths and diameters, ideal for high-performance shafts, machine parts, and gears. Enjoy excellent impact toughness (Charpy V-notch tested), good machinability in annealed state, and heat treatability for extreme demands. Every bar meets ASTM, AISI, SAE, and EN/DIN standards, backed by mill test certification. Width, finish, and coating are tailored to your requirements for unmatched project compatibility.

Features & Application Areas of 4140 Round Alloy Steel Bars

4140 Round Alloy Steel Bars are engineered for heroic performance in rigorous environments. With yield strength up to 835 MPa and excellent toughness, they excel in shafts, gears, axles, and machine parts. Their formability, machinability, and heat-treatable nature make them a top choice for engineering and structural applications across industries like automobiles, heavy machinery, and construction. The standard and customizable sizes allow seamless integration into specific design requirements and demanding mechanical jobs.

Rate, Delivery, Packing & Dispatch of 4140 Round Alloy Steel Bars

4140 Round Alloy Steel Bars are shipped promptly from leading Indian ports, ensuring reliable delivery rates. Secure packing-bundled or boxed with protective wrapping-guards against transit damage and preserves surface quality. Dispatch begins after final inspection and certification, matching your supply schedule. Sample availability supports product evaluation before committing to larger orders. FOB terms are flexible, making the purchase process efficient and cost-effective for both domestic and international buyers.

FAQ's of 4140 Round Alloy Steel Bars:

Q: How can 4140 Round Alloy Steel Bars be customized to fit my project needs?

A: The bars are available in a wide range of diameters (12 mm to 300 mm and above) and customizable lengths. You can also choose your preferred finish-Black, Bright, Peeled, or Polished-to suit your application specifications.

Q: What are the main benefits of choosing AISI 4140 alloy steel for engineering applications?

A: AISI 4140 offers excellent strength, toughness, and machinability. It is heat treatable for enhanced performance and is ideal for use in gears, shafts, axles, and structural components requiring high reliability.

Q: Where are 4140 Round Alloy Steel Bars typically used?

A: These bars are widely employed in the automotive, machinery, and construction sectors for making parts such as gears, bolts, shafts, and axles due to their outstanding mechanical properties.

Q: What is the process for ordering and receiving a sample of 4140 alloy steel bars?

A: Samples are available upon request for evaluation. After you confirm your requirements, samples are processed for quick dispatch from the supplier's nearest port, subject to standard delivery timelines.

Q: How should 4140 alloy steel bars be handled during welding?

A: Welding is best performed with pre- and post-heat treatment to maintain the material's structural integrity and ensure the best weld results, as recommended by industry standards.

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