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Help CenterHot Rolled Carbon Steel Round Bar 4140 Alloy Steel 42CrMo4 1.7225 40mm-300mm
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Hemaokang Steel (Shandong) Co., Ltd. is pleased to present our premium Hot Rolled Carbon Steel Round Bar 4140 Alloy Steel 42CrMo4 1.7225 in diameters ranging from 40mm to 300mm. As a reliable manufacturer with an annual export value exceeding US$50 million, we combine advanced hot rolling technology with strict quality control to deliver high-strength, durable round bars suitable for demanding industrial applications. Our product offers excellent machinability, wear resistance, and uniform mechanical properties, making it an ideal choice for shafts, gears, axles, and structural components.
This round bar is manufactured from high-quality alloy steel 4140 (equivalent to 42CrMo4 / 1.7225), ensuring consistent chemical composition and mechanical performance. The hot rolling process refines the grain structure, enhancing toughness and reducing internal stress. With a diameter range of 40mm to 300mm, we can supply customized lengths and surface finishes (black, peeled, or turned) according to your project requirements. Each batch is thoroughly tested to meet ISO9001 standards, guaranteeing traceability and reliability.
Key Features & Technical Specifications
- High Strength & Toughness – The 4140 alloy offers excellent tensile strength (850–1000 MPa) and impact resistance, suitable for heavy-load components.
- Heat Treatable – Can be quenched and tempered to achieve desired hardness (HRC 28–35 typical) and mechanical properties.
- Wide Diameter Range – 40mm to 300mm, with custom lengths up to 12 meters per piece.
- Uniform Chemical Composition – Strict control of C, Mn, Cr, Mo elements ensures consistency across batches.
- Surface Options – Black hot rolled finish as standard; peeled or precision ground finish available upon request.
- Global Compliance – Manufactured under ISO9001 quality management system, meeting international standards.
| Parameter | Value |
|---|---|
| Material Grade | 4140 / 42CrMo4 / 1.7225 |
| Carbon Content (C) | 0.38% – 0.43% |
| Chromium (Cr) | 0.80% – 1.10% |
| Molybdenum (Mo) | 0.15% – 0.25% |
| Tensile Strength (Rm) | 850 – 1000 MPa |
| Yield Strength (Rp0.2) | ≥ 600 MPa |
| Hardness (as rolled) | ≤ 285 HB |
| Diameter Range | 40 mm – 300 mm |
| Standard Length | 6 m / 12 m (customizable) |
| Surface Finish | Black / Peeled / Ground (optional) |
Beyond the standard specifications, we offer value-added services such as cutting to length, heat treatment (quenching & tempering), and surface shot blasting. Our round bars are widely used in the manufacture of automotive components, heavy machinery, mining equipment, oil & gas parts, and structural steelwork. The balanced combination of strength, ductility, and fatigue resistance reduces downtime and extends service life for your end products.
Why Choose Hemaokang Steel?
As a newly established company in 2025, Hemaokang Steel has rapidly built a reputation for excellence using decades of collective industry experience. We operate with a team of 51–100 skilled professionals and maintain an annual export value of US$50 million – US$100 million, serving markets across North America, South America, Europe, Southeast Asia, Africa, and Oceania. Our commitment to quality is certified by ISO9001, ensuring every round bar meets rigorous international standards.
- Strict Quality Control – Each production batch undergoes chemical analysis, mechanical testing, and dimensional inspection.
- Flexible Supply – We accommodate small trial orders as well as large container shipments with fast lead times (15–30 days).
- Competitive Pricing – Direct factory pricing eliminates middlemen, giving you cost advantages without compromising quality.
- Professional Support – Our technical team assists with material selection, heat treatment recommendations, and application advice.
Whether you need standard sizes or custom dimensions, Hemaokang Steel is your trusted partner for alloy steel round bars. Contact us today for a quotation or to discuss your specific requirements. We look forward to building a long-term cooperation with you!
Frequently Asked Questions
Q1: What is the difference between 4140 and 42CrMo4?
They are nearly equivalent grades. 4140 is the AISI/SAE designation, while 42CrMo4 is the European standard (EN 10083-3). Both have similar chemical composition and mechanical properties; 1.7225 is the material number for 42CrMo4. Our product meets all three designations.
Q2: Can you supply round bars with a diameter larger than 300mm?
We currently stock 40mm–300mm. For diameters above 300mm, please inquire; we may offer custom production or alternative sizes upon request.
Q3: Do you provide heat treatment services?
Yes, we offer quenching and tempering, normalizing, and annealing as optional services. Please specify your required hardness range when ordering.
Q4: What is the minimum order quantity (MOQ)?
Our MOQ is typically 1 ton for standard sizes. For trial orders, we can negotiate smaller quantities. Contact our sales team for details.
Q5: How long is the delivery time?
Standard delivery is 15–30 days after order confirmation, depending on quantity and specifications. Urgent orders can be expedited.
Q6: Are the round bars supplied with a mill test certificate?
Yes, each batch comes with a mill test certificate (MTC) showing chemical composition and mechanical properties, in accordance with ISO9001.
Q7: Can you cut the bars to specific lengths?
Absolutely. We can cut to your required lengths (e.g., 1m, 3m, 6m) with precision sawing. Tolerance is typically ±5mm.
Q8: What surface finishes are available?
Standard is black hot rolled surface. We also offer peeled (bright) finish, turned finish, or shot-blasted surface. Each option has different cost and surface roughness.
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