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Help CenterTurned Ground Polished 30CrMnSi Round Alloy Steel Bar Diameter 10-500mm EN 10083-3 Application Tool Making
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What Is Alloy Steel Round Bar？
Product Definition：
Alloy steel round bar is a solid, cylindrical long product manufactured from steel containing one or more alloying elements beyond carbon and manganese – such as chromium, molybdenum, nickel, vanadium, titanium, and silicon. These alloying elements enhance the steel‘s mechanical properties, including strength, hardness, toughness, wear resistance, and heat treatability, making alloy steel superior to plain carbon steel for demanding engineering applications.
Why Choose Alloy Steel Over Carbon Steel？
| Factor | Alloy Steel | Carbon Steel |
|---|---|---|
| Strength | Higher (yield up to 930+ MPa) | Moderate (yield up to 355 MPa) |
| Hardness | Higher (up to 300+ HB) | Lower (120–180 HB) |
| Wear Resistance | Excellent | Poor |
| Heat Treatability | Excellent (responsive to QT, carburizing) | Limited |
| Toughness | Good (with proper heat treatment) | Moderate |
| Cost | Higher | Lower |
Key Characteristics：
| Feature | Description |
|---|---|
| High Strength | Tensile strength from 800–1100+ MPa depending on grade and heat treatment |
| Excellent Hardness | Can achieve 30–60 HRC through proper heat treatment |
| Good Toughness | Alloying elements improve impact resistance at high hardness levels |
| Heat Treatable | Suitable for quenching, tempering, carburizing, nitriding, and induction hardening |
| Wear Resistance | Chromium and molybdenum improve resistance to abrasion and wear |
| Fatigue Resistance | Alloy steels offer superior fatigue strength for cyclic loading applications |
| 100% Recyclable | Environmentally friendly with no loss of properties |
Main Alloying Elements & Their Effects：
| Element | Effect |
|---|---|
| Chromium (Cr) | Increases hardenability, wear resistance, and corrosion resistance |
| Molybdenum (Mo) | Improves high-temperature strength, hardenability, and creep resistance |
| Nickel (Ni) | Enhances toughness, impact strength, and low-temperature properties |
| Manganese (Mn) | Increases strength and hardenability, acts as a deoxidizer |
| Silicon (Si) | Improves strength and acts as a deoxidizer |
| Vanadium (V) | Refines grain structure, improves strength and toughness |
| Titanium (Ti) | Refines grain size, improves toughness |
Typical Applications by Industry：
| Industry | Applications | Recommended Grades |
|---|---|---|
| Machinery Manufacturing | Shafts, gears, spindles, rollers, machine tool parts, connecting rods | 40Cr, 42CrMo, 35CrMo |
| Automotive | Crankshafts, camshafts, transmission shafts, axle shafts, gears, steering components | 42CrMo, 20CrMnTi, 40Cr |
| Aerospace | Landing gear components, structural fasteners, engine mounts | 4140, 4340 |
| Oil & Gas | Drill pipe components, wellhead equipment, valve stems, pump shafts | 4140, 42CrMo |
| Construction & Heavy Equipment | Excavator pins, bucket pins, structural components, crane parts | 35CrMo, 42CrMo |
| Fastener Manufacturing | High-strength bolts, studs, nuts, threaded rods | 35CrMo, 42CrMo, SCM435 |
| Gear Manufacturing | Transmission gears, differential gears, pinion shafts | 20CrMnTi, 8620, 40Cr |
| Shipbuilding | Marine shafts, propeller shafts, rudder stocks | 42CrMo, 35CrMo |
Each batch includes EN 10204 3.1 mill test certificate with full chemical and mechanical data. Third-party inspection (SGS, BV, TÜV) supported. MOQ: 5 tons, trial orders welcome.
Key Specifications – Alloy Steel Round Bar
| Parameter | Specification / Range | Remarks |
|---|---|---|
| Standards | GB/T 3077, ASTM A29/A29M, JIS G4053, EN 10083, DIN 17200 | Others on request |
| Cr-Mo Series (High Strength) | 35CrMo, 42CrMo, 40Cr, SCM435, 4140, 4142 | Excellent strength and toughness |
| Cr-Mn-Ti Series (Carburizing) | 20CrMnTi, 15CrMnTi | Gear steel, excellent surface hardness |
| Cr-Mo Series (Carburizing) | 20CrMo, 30CrMo | Good hardenability, weldability |
| Ni-Cr-Mo Series (High Toughness) | 40CrNiMo, 4340, 8620 | High toughness, aerospace grades |
| Cr Series | 15Cr, 20Cr, 35Cr, 50Cr | General alloy structural steel |
| Diameter Range – Hot Rolled | 6 mm – 250 mm | Standard range |
| Diameter Range – Forged | 50 mm – 500+ mm | Large diameters |
| Diameter Range – Cold Drawn | 6 mm – 100 mm | Precision applications |
| Length | 3 m, 4 m, 6 m, 9 m, 12 m, or custom cut | Tolerance ±5–10mm |
| Delivery Condition | Hot rolled, forged, cold drawn, peeled, or ground | See Screen 8 |
| Surface | Black (mill scale), bright (cold drawn), peeled, polished | See Screen 8 |
| Heat Treatment Condition | As-rolled, annealed, normalized, quenched & tempered | See Screen 7 |
| Straightness | ≤3 mm per meter (standard); ≤1.5 mm per meter (precision) | |
| Density | 7.85 g/cm³ | |
| Testing | Chemical analysis (OES), tensile, hardness (HB/HRC), 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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