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Hemaokang Steel (Shandong) Co., Ltd. is an export-focused manufacturer and supplier of engineering steel products located in Liaocheng, Shandong, China. We produce high quality S45C/C45 carbon steel solid rods through a cold drawn and annealed process. These round bars have a consistent hardness range of HB180-220, which provides excellent machinability while retaining the strength needed for shafts, spindles, gears, pins, and other industrial parts. With an annual export value of US$50 million to US$100 million and a professional team of 51 to 100 employees, we serve overseas buyers with stable supply and reliable service.
Product Introduction
S45C and C45 are medium-carbon structural steel grades widely used in manufacturing. Cold drawing improves the dimensional accuracy and surface finish of the round bar, while annealing relieves internal stress and creates a more uniform metallurgical structure. The final hardness of HB180-220 is deliberately controlled to give a good balance between cutting performance and mechanical strength. This product is especially suitable for customers who need a machinable steel bar for components requiring moderate strength, good wear resistance after heat treatment, and a dependable surface for machining or coating.
Key Features and Benefits
- Controlled hardness HB180-220: Stabilizes cutting pressure, reduces tool wear, and makes machining more predictable.
- Cold drawn precision: Offers closer tolerances and better straightness than hot-rolled bars, reducing the need for excessive stock removal.
- Annealed condition: Lowers internal stress, improves ductility, and supports cleaner threads and smoother milled surfaces.
- Smooth surface: Provides a dense outer layer that decreases burr formation and simplifies pre-treatment before manufacturing.
- Custom lengths: Available as fixed lengths or cut-to-size according to your production needs.
- Flexible supply: Suitable for small trial orders and large container shipments, with packing designed for exports.
Technical Specifications
| Parameter | Specification |
| Material | S45C / C45 carbon steel |
| Process | Cold drawn, full annealed |
| Hardness | HB 180 - 220 |
| Diameter | Ø10 mm - Ø250 mm or customized |
| Length | 3 m - 12 m or specified length |
| Straightness | Controlled within relevant standard limits |
| Surface | Smooth black oxide or bright finish |
| Delivery condition | Cold drawn and annealed |
| Packing | Bundles with steel strapping and waterproof material |
| Inspection | In-house inspection, test certificate upon request |
Typical Chemical Composition
| Element | Typical Percentage |
| Carbon (C) | 0.42 - 0.50% |
| Silicon (Si) | 0.17 - 0.37% |
| Manganese (Mn) | 0.50 - 0.80% |
| Phosphorus (P) | ≤ 0.035% |
| Sulfur (S) | ≤ 0.035% |
Applications
- Shafts, spindles, axles and connecting rods for light and medium duty equipment.
- Gears, gear shafts, racks and general machine tool parts.
- Bolts, studs, pins and fasteners that require consistent core hardness.
- Structural components for frames, brackets and mechanical supports.
- Precision turned parts for automotive, agricultural and general engineering sectors.
Quality and Export Experience
Our manufacturing facility operates under an ISO9001 certified quality management system. Incoming raw material, in-process production and finished bar dimensions are checked before shipment. Mill test certificates and material test reports are available upon request, giving you clear documentation for specification compliance. We understand the importance of smooth logistics: our main shipping port is Qingdao, which allows efficient containerized cargo movement to many regions. Our team regularly supplies buyers in North America, South America, Eastern Europe, Southeast Asia, Africa, Oceania, the Middle East, and other international markets. Whether you need regular restocking or a one-time project order, we can provide a responsive quotation and production schedule.
Customization and Order Support
- Length cutting: bars can be cut to a fixed length or machined on request.
- Surface options: black oxide finish, bright finish or peeled surface are available according to requirement.
- Order quantities: flexible MOQ for common sizes, with special packaging and loading arrangements for large orders.
- Documentation: commercial invoice, packing list, mill test certificate and other export documents can be provided.
Frequently Asked Questions
Q1: What is the difference between S45C and C45?
S45C is usually defined under JIS G4051, while C45 is a common designation in EN/DIN standards. They are both medium-carbon steel grades with similar chemical composition and mechanical behavior. In many engineering parts, one can be used as an equivalent to the other, but you should always confirm the required standard and hardness for your specific application.
Q2: Why is the hardness controlled at HB180-220?
This hardness range gives a stable balance between machinability and strength. With HB180-220, the material is easier to turn, mill, drill and grind than harder grades, while still maintaining enough strength for structural and mechanical parts.
Q3: Can you supply material cut to a specific length?
Yes. We regularly supply bars cut to customer specified lengths. Please provide the exact dimensions and quantities, and we will confirm the cutting and production schedule.
Q4: Do you provide material test certificates?
Yes. We can provide a mill test certificate and material test report upon request. The report typically includes heat number, chemical composition, hardness and mechanical properties.
Q5: What is the export packing method?
Small size round bars are usually bundled, tightly strapped with steel strips and wrapped with waterproof material. Large diameter bars are packed in loose bundles or secured in containers according to the shipping method, to avoid damage during transport.
Q6: What is the minimum order quantity?
MOQ depends on the diameter, length and surface requirements. For common sizes, we can accept a trial order to help you evaluate the product quality and delivery performance. Please send your specification for a direct quotation.
Q7: Do you support third-party inspection?
Yes. Third-party inspection is welcome and can be arranged before shipment. We can also provide in-house inspection reports to support your incoming quality check.
Q8: Which port do you ship from?
Our main shipping port is Qingdao, China. Depending on the order volume and destination, other nearby ports can also be arranged after discussion.
If you are looking for a reliable carbon steel round bar supplier with consistent hardness, good machinability and strong export capability, please contact Hemaokang Steel with your required diameter, length and quantity. We will provide a clear quotation and suitable processing advice for your project.
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