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Help Center1020 1045 4140 Carbon Steel Round Bar Diameter 10-300mm Round Rod for Automotive Machinery Manufacturing
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What Is Carbon Steel Round Bar？
Product Definition：
Carbon steel round bar is a solid, cylindrical long product manufactured from carbon steel billets through hot rolling, forging, or cold drawing processes-1-7. With carbon as the primary alloying element (typically 0.05-0.50%), it offers an excellent balance of strength, ductility, machinability, and cost-effectiveness – making it one of the most widely used materials in construction, machinery manufacturing, automotive, and infrastructure projects--1.
Product Forms：
| Form | Manufacturing Process | Diameter Range | Surface | Key Features |
|---|---|---|---|---|
| Hot Rolled Round Bar | Rolled from billet at high temperature | 5.5 – 250 mm | Mill scale (black) | Most economical, good for general structural use-1 |
| Forged Round Bar | Formed by forging under pressure | 50 – 500+ mm | Black, smooth | Higher density, better mechanical properties, suitable for large diameters |
| Cold Drawn Round Bar | Drawn through die at room temperature | 5.5 – 100 mm | Bright, smooth | Tight tolerances, excellent surface finish-1 |
Key Characteristics：
| Feature | Description |
|---|---|
| High Strength | Tensile strength from 370–600+ MPa depending on grade and heat treatment- |
| Excellent Machinability | Low to medium carbon content ensures good cutting and drilling performance |
| Good Weldability | Suitable for arc welding, gas welding, and resistance welding (grade dependent) |
| Heat Treatable | Medium carbon grades (20#, 45#) can be quenched and tempered for enhanced properties- |
| Cost-Effective | Most economical choice for structural and mechanical applications |
| Wide Size Range | Diameter from 5.5mm to 500mm, length up to 12m |
| 100% Recyclable | Environmentally friendly with no loss of properties |
Typical Applications by Industry：
| Industry | Applications | Recommended Grades |
|---|---|---|
| Construction & Infrastructure | Reinforcing bars, structural supports, anchor bolts, scaffolding components | Q235, A36, SS400, S235JR- |
| Machinery Manufacturing | Shafts, gears, spindles, rollers, machine tool parts, connecting rods | 20#, 45#, 1045, S45C- |
| Automotive | Axles, crankshafts, transmission shafts, steering components, suspension parts | 45#, 1045, S45C- |
| Fastener Manufacturing | Bolts, studs, nuts, threaded rods, standard parts | Q235, 20#, 1020 |
| Steel Pipe & Tube | Seamless pipe billets, tube blanks | Q235, Q355, 20#-1 |
| Oil & Gas | Drill pipe components, wellhead equipment, valve stems | Q355, 45#, 4140 |
| General Fabrication | Brackets, gussets, repair sections, custom machined parts | Q235, A36 |
Key Specifications – Carbon Steel Round Bar
| Parameter | Specification / Range | Remarks |
|---|---|---|
| Standards | ASTM A36, A283, A663; GB/T 700, GB/T 699, GB/T 14292; EN 10025; JIS G3101, JIS G4051; DIN | Others on request- |
| Structural Grades | Q235 (A/B/C/D), A36, SS400, S235JR/J0/J2, S275JR | Most common for construction- |
| Higher Strength Grades | Q355 (B/C/D/E), S355JR/J0/J2, SS490, SS540, A572 Gr.50 | Load-bearing structures-5 |
| Carbon/Machinery Grades | 20#, 45#, 1020, 1045, S20C, S45C, C22, C45 | For mechanical parts, heat treatment-1 |
| High Carbon Grades | 55#, 60#, 1060, S55C, S60C | High strength, wear resistance- |
| Alloy Grades | 40Cr, 42CrMo, 4140, 4130, 40Mn2 | Higher strength, specialized applications-7 |
| Diameter Range – Hot Rolled | 5.5 mm – 250 mm | Standard range-1 |
| Diameter Range – Forged | 50 mm – 500+ mm | Large diameters |
| Diameter Range – Cold Drawn | 5.5 mm – 100 mm | Precision applications-1 |
| Length | 3 m, 4 m, 6 m, 9 m, 12 m, or custom cut | Tolerance ±5–10mm |
| Surface | Black (mill scale), bright (cold drawn), peeled, polished | See Screen 8 |
| Straightness | ≤3 mm per meter (standard); ≤1.5 mm per meter (precision) | |
| Density | 7.85 g/cm³ | |
| Testing | Chemical analysis (OES), tensile, hardness (HB), impact (Charpy), UT (optional) | Mill cert EN 10204 3.1 |
| Packaging | Bundled with steel straps, wooden pallet | Seaworthy, ISPM 15 |
Wuxi Yansheng Technology Co., Ltd. – Company Profile
Wuxi Yansheng Technology Co., Ltd. is a comprehensive technology enterprise specializing in high-quality metal raw material supply and precision processing services. Located in Wuxi City, a major steel distribution center in China, the company leverages the mature industrial chain advantages of the Yangtze River Delta region to provide professional material solutions to global customers.
As a technology-driven enterprise, Yansheng Tech maintains strategic cooperation with several well-known steel mills (such as TISCO, Baosteel, JISCO, Dongfang Special Steel, etc.) and is an authorized distributor of these mills. Our main products include stainless steel (304/316/BA/EP pipe), carbon steel, silicon steel, copper, aluminum and other materials in the form of sheets, pipes, coils, as well as custom-processed parts.
Core Business Highlights:
Material Supply: We maintain sufficient stock inventory, offering 304/316 stainless steel sheets, pipes, coils, API 5L casing, electrical steel, and more. We also accept orders for special steel grades and non-standard specifications.
Precision Processing: Equipped with imported mirror polishing machines, water jet cutting machines, high-precision slitting/leveling lines, large CNC milling machines, boring machines, and more. We provide customized services including BA/EP pipe finishing, medium plate polishing, matte finishing, embossing, plasma cutting, etc.
Main Applications: Our products are widely used in industries such as solar energy, pressure vessels, boilers, electric heating equipment, petrochemicals, environmental protection machinery, pharmaceutical and food processing, and new energy vehicles.
Our processing center is located in Xishan District, Wuxi City, covering nearly 10,000 square meters, with an experienced technical and service team. We adhere to the business philosophy of "Technology First, Quality Oriented, Service Supreme" , providing 24/7 warehousing and logistics support as well as comprehensive after-sales service. Yansheng Tech is committed to being your trusted long-term partner.
Frequently Asked Questions (FAQ)
Q1. What products do you mainly supply?
We mainly supply stainless steel (304/316/BA/EP pipes), carbon steel, silicon steel, copper, aluminum, and other materials in sheets, pipes, and coils. Customized processing services are also available.
Q2. Do you have stock available?
Yes, we maintain sufficient stock for most standard specifications. For non-standard sizes, we can accept orders with reasonable lead time.
Q3. Can you provide MTC (Mill Test Certificate)?
Yes, we provide MTC for every shipment. Third-party inspection (SGS, TÜV, BV, etc.) is also available upon request.
Q4. Do you support video inspection before shipment?
Yes, we fully support video inspection. You can also arrange an agent or third party to visit our factory for on-site inspection before shipment.
Q5. What are your main export markets?
We export to Southeast Asia, the Middle East, Europe, Africa, and South America. We have rich experience in international trade and export documentation.
Q6. What payment terms do you accept?
We accept T/T (wire transfer), L/C at sight (irrevocable), and sometimes a combination of T/T deposit + L/C balance. Payment terms are negotiable based on order size and customer history.
Q7. Can you provide samples?
Yes, samples are available for most standard products. For custom sizes, we may need to produce small batch samples. Sample cost and shipping are usually borne by the customer, but can be discussed.
Q8. What is your typical lead time?
For stock items: 7–10 days after order confirmation. For custom production: 20–30 days, depending on the specification and quantity.
Q9. What quality certifications do you have?
We provide MTC with every shipment. Our partner mills are ISO9001 certified. We can also assist with third-party inspections (SGS, TÜV, BV) upon request.
Q10. How can I get a quotation?
Please send us your material grade, specification (size, thickness, length), quantity, and preferred trade term (FOB, CIF, DAP, etc.). We will reply with a detailed quotation within 24 hours.
Send Inquiry to This Supplier
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