Contact Platform Support
Help CenterAISI 4140 Alloy Steel Round Bar Hot Rolled 25mm-300mm Annealed For Heavy Duty Use
Product Spotlights
Related Products
-
AISI 1045 Hot Rolled Carbon Steel Rod 8mm-150mm Diameter Construction Grade Round BarNegotiableMOQ: 1 Ton -
ASTM A36 Hot Rolled Carbon Steel Rod 6mm-200mm Black Bar For Structural SupportNegotiableMOQ: 1 Ton
-
Hot Rolled Carbon Steel Rod AISI 1018 10mm-50mm Mill Test Report Included Round BarNegotiableMOQ: 1 Ton
-
Hot Rolled Carbon Steel Rod For Shaft Manufacturing AISI 1045 20mm-100mm With Bending ServiceNegotiableMOQ: 1 Ton
-
Carbon Steel Plate ASTM A36 6mm 8mm 10mm Thickness 1500mm 2000mm Width Hot Rolled for Structural UseNegotiableMOQ: 1 Ton
Hemaokang Steel (Shandong) Co., Ltd. is proud to present our premium AISI 4140 Alloy Steel Round Bar in hot rolled and annealed condition, designed specifically for heavy duty applications. With an annual export value exceeding US$50 million and serving global markets across North America, Europe, Asia, and beyond, we ensure consistent quality and reliable supply. This product offers excellent strength, toughness, and wear resistance, making it the ideal choice for demanding industrial components.
Product Overview: Our AISI 4140 round bars are manufactured using advanced hot rolling technology, followed by a full annealing process to achieve a uniform microstructure and improved machinability. The bars are available in diameters from 25mm to 300mm, catering to a wide range of heavy duty machinery parts, shafts, gears, and structural components.
Key Features & Benefits
- High Strength & Toughness: AISI 4140 alloy steel offers excellent tensile strength and impact resistance, suitable for load-bearing applications.
- Annealed Condition: The annealing process reduces hardness and improves ductility, making the bar easier to machine and form.
- Wide Diameter Range: 25mm to 300mm options allow flexibility for various project requirements.
- Consistent Quality: Manufactured under strict quality control with ISO9001 certification, ensuring reliable performance.
- Customizable Lengths: Available in standard lengths or cut to your specifications.
- Versatile Applications: Ideal for heavy duty shafts, gears, axles, bolts, and machinery parts.
Technical Specifications
| Property | Value |
| Standard | ASTM A29/A29M |
| Chemical Composition (typical) | C: 0.38-0.43%, Mn: 0.75-1.00%, Cr: 0.80-1.10%, Mo: 0.15-0.25% |
| Tensile Strength (annealed) | ≥ 655 MPa |
| Yield Strength (annealed) | ≥ 415 MPa |
| Hardness (annealed) | ≤ 217 HB |
| Diameter Range | 25mm – 300mm |
| Length | Standard 6m, customizable up to 12m |
| Surface Finish | Black (as rolled) or Bright (optional) |
Applications
This AISI 4140 hot rolled annealed round bar is widely used in heavy duty environments where strength and durability are critical. Common applications include:
- Heavy machinery shafts and spindles
- Industrial gears and pinions
- Axles and connecting rods
- High-strength bolts and fasteners
- Tool holders and jigs
- Structural components for mining and construction equipment
Why Choose Hemaokang Steel?
As a newly established company in 2025, Hemaokang Steel has quickly built a reputation for excellence, with an annual export value between US$50 million and US$100 million. Our team of 51-100 experienced professionals ensures strict quality control at every stage. We hold ISO9001 certification, guaranteeing that our products meet international standards. Our products are trusted by clients in North America, South America, Europe, Asia, Africa, Oceania, and the Middle East. We offer flexible customization, competitive pricing, and reliable logistics to meet your project deadlines.
Contact us today for a quote or to discuss your specific requirements. Experience the durability and performance of our AISI 4140 alloy steel round bar – the backbone of heavy duty industrial applications.
Frequently Asked Questions (FAQ)
1. What is the difference between annealed and normalized AISI 4140?
Annealing involves heating and slow cooling to soften the steel, making it easier to machine and form. Normalizing uses air cooling, resulting in slightly higher strength but lower ductility. Our annealed round bar is optimized for machinability and dimensional stability.
2. Can I get the bars cut to specific lengths?
Yes, we offer custom cutting services. Standard lengths are 6m, and we can cut to any size up to 12m upon request. Please contact us for details.
3. Is the surface finish black or bright?
The standard surface is black (as rolled from hot rolling). A bright (machined) surface is available as an option. Please specify your preference when ordering.
4. What certifications do you have?
We are ISO9001 certified. Our products comply with ASTM A29/A29M standards. Mill test certificates are provided with each shipment.
5. What is the minimum order quantity?
The MOQ depends on the diameter and length. Typically, we require a minimum of 1 ton for standard sizes. For smaller quantities, please contact us.
6. How long does shipping take?
Shipping time varies by destination. For most international orders, we estimate 20-35 days from order confirmation. We work with reliable freight forwarders to ensure timely delivery.
7. Can this material be heat treated after machining?
Yes, AISI 4140 is a through-hardening steel that responds well to heat treatment (quenching and tempering). The annealed condition provides a good starting point for further heat treatment to achieve desired hardness and strength.
8. Do you offer samples?
Yes, we can provide small samples for evaluation. Please contact our sales team with your requirements. Sample costs and shipping are negotiable.
Send Inquiry to This Supplier
You May Also Like
-
Carbon Steel Plate SS400 SPHC 2mm 3mm 4mm 5mm 6mm 1219x2438mm Hot Rolled Building MaterialNegotiableMOQ: 1 Ton
-
Carbon Steel Plate ASTM A36 S235JR 1 Year Warranty Free Sample Support Technical Support for ExportNegotiableMOQ: 1 Ton
-
Carbon Steel Plate S235JR S275JR S355JR 3mm 4mm 5mm 6mm 8mm 10mm 1500x3000mm LengthNegotiableMOQ: 1 Ton
-
Carbon Steel Plate 4mm 6mm 8mm 10mm 1500x3000mm With Mill Test Report and Custom Cutting ServiceNegotiableMOQ: 1 Ton
-
Carbon Steel Plate Hot Rolled 6mm 8mm 10mm 1500mm Width for Steel Structure and Bridge EngineeringNegotiableMOQ: 1 Ton
-
Carbon Steel Plate 10mm 12mm 15mm A283 Gr C for Shipbuilding and Offshore Platform ApplicationNegotiableMOQ: 1 Ton
-
Carbon Steel Plate A516 Gr 60 70 10mm 12mm 15mm 2000x6000mm Mill Test Report for Pressure VesselNegotiableMOQ: 1 Ton
-
Carbon Steel Sheet A283 Gr C A516 Gr 70 4mm 6mm 8mm 10mm 12mm Hot Rolled Mill EdgeNegotiableMOQ: 1 Ton
-
Carbon Steel Plate Q235B Q345B 8mm 10mm 12mm 16mm 1500x3000mm Hot Rolled Standard CompliantNegotiableMOQ: 1 Ton
-
Carbon Steel Pipe ASTM A106 Gr. B, Sch160, 2" NPT Threaded, High Pressure 3000 PSINegotiableMOQ: 1 Ton
