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Help CenterASTM A311 Type B Stress Relieved Carbon Steel Rod 16mm 32mm 64mm Turned Ground Shaft Bar
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Hemaokang Steel (Shandong) Co., Ltd. proudly introduces our ASTM A311 Type B Stress Relieved Carbon Steel Rod, available in 16mm, 32mm, and 64mm diameters with a precision turned and ground shaft bar finish. Manufactured in our Liaocheng facility and exported globally, this product is designed to meet rigorous industrial demands for high strength, dimensional accuracy, and surface integrity. Whether you need components for heavy machinery, automotive parts, or precision shafts, our steel rod delivers consistent performance and reliability, ensuring your production runs smoothly.
The ASTM A311 specification covers carbon steel bars subject to mechanical stress relief, and the Type B classification indicates a higher level of residual stress reduction through controlled processing. Our turned and ground finish provides an excellent surface quality with tight tolerances, reducing the need for additional machining and saving you both time and cost. Below, we outline the key features and specifications in detail.
Key Features & Benefits
- Stress Relieved (Type B): The material undergoes a controlled stress-relief process to minimize internal stresses, reducing distortion during machining and improving dimensional stability.
- Turned and Ground Finish: Our bars are precision turned and ground to achieve a smooth, bright surface with standard tolerances of h9 to h11, ready for use in high-precision applications.
- Multiple Diameter Options: Available in 16mm, 32mm, and 64mm diameters, with other sizes available upon request to suit your specific needs.
- High Strength & Wear Resistance: The carbon steel composition provides excellent tensile strength and wear resistance, making it ideal for shafts, spindles, and other load-bearing components.
- Excellent Machinability: Despite its strength, the steel is designed for good machinability, allowing for efficient drilling, turning, milling, and threading.
- Customizable Length: Bars can be cut to your required length, offering flexibility for various production setups.
Technical Specifications
| Parameter | Value |
|---|---|
| Standard | ASTM A311 |
| Condition | Type B Stress Relieved |
| Diameter Range | 16mm / 32mm / 64mm (other sizes on request) |
| Surface Finish | Turned and ground, bright finish |
| Tensile Strength | Typically 100-150 ksi (depending on diameter and chemistry) |
| Yield Strength | Typically 75-125 ksi (per ASTM A311) |
| Elongation | 10-20% in 2 inches (dependent on size) |
| Straightness | Within 0.0015 in/ft (tight tolerance) |
| Length | Random 3-6m or cut to specification |
Ideal Applications
- Precision shafts and axles for automotive and machinery
- Spindles, rollers, and conveyor components
- Pins, studs, and fasteners requiring high strength
- Hydraulic cylinder rods and piston rods
- General machining and fabrication projects
- Agricultural equipment parts and structural supports
Quality and Production: Our steel rods are produced under strict quality control measures, with each batch tested to ensure compliance with ASTM A311 standards. The turning and grinding processes are performed on high-precision CNC machines, guaranteeing consistent roundness, surface finish, and size accuracy. We also offer surface treatments such as chrome plating or phosphating as optional services, and can supply bars with special tolerances or mechanical properties upon request.
Why Choose Hemaokang Steel? As a company founded in 2025, we have quickly established a strong export presence with an annual export value of US$50-100 million. Our team of 51-100 employees is dedicated to providing high-quality steel products that meet international standards. We are certified under ISO9001, reflecting our commitment to quality management systems. Our factory is located in Liaocheng, a key steel production hub in China, and we ship globally from Qingdao port, ensuring efficient logistics and competitive pricing.
We serve diverse markets across North America, South America, Europe, Asia, Africa, and Oceania, and we understand the importance of reliable supply chains. Our customers benefit from our flexible production capabilities, responsive customer service, and technical support. Whether you require a single batch or ongoing supply, we are ready to meet your demands with professionalism and integrity.
Ordering Information: To place an order, please provide your desired diameter, length, and quantity. We also accept inquiries for custom sizes and special requirements. Our sales team will respond promptly with a detailed quotation and lead time. We welcome your inquiry and look forward to building a mutually beneficial partnership.
Frequently Asked Questions (FAQ)
-
What does "Type B Stress Relieved" mean?
Type B refers to a specific stress relief treatment process where the bars are heated to a controlled temperature and then cooled slowly. This further reduces internal residual stresses compared to Type A, improving machinability and stability. It is especially beneficial for parts that will undergo additional machining. -
Can you supply other diameters besides 16mm, 32mm, and 64mm?
Yes, we can produce custom diameters within a range of 6mm to 300mm, depending on your specifications. Please contact us with your required size and tolerance, and we will confirm availability. -
What surface finish do you provide? Is it suitable for direct use?
The standard finish is turned and ground, which provides a bright, smooth surface with tight tolerances (typically h9-h11). This finish is suitable for many applications without additional machining. For higher requirements, we can also offer polished or special surface treatments as optional. -
Do you provide material certificates or test reports?
Yes, we can provide a mill test certificate for each batch, including chemical composition and mechanical properties, to ensure full traceability and compliance with ASTM A311. Third-party inspection is also available upon request. -
What is the typical lead time?
For standard sizes and quantities, the lead time is usually 15-25 days after order confirmation. Custom sizes or large orders may take longer, and we will always confirm exact delivery times before proceeding. -
Can you cut the rods to specific lengths?
Absolutely. We offer cutting to precise lengths (e.g., 500mm, 1000mm, or custom) to reduce waste and ready-to-use parts. The cutting tolerance is generally ±2mm, but tighter tolerances are possible on request. -
Is your product suitable for hydraulic cylinder rods?
Yes, these rods are commonly used in hydraulic and pneumatic cylinders due to their good strength, surface finish, and wear resistance. For demanding applications, we can also advise on alternative materials or additional chrome plating. -
Do you export to my country?
We export worldwide. Our main markets include North America, South America, Europe, Asia, Africa, and Oceania. We have experience with international shipping and can arrange all necessary export documentation from Qingdao port.
Trust and Accountability: With our strong export volume of US$50-100 million annually and ISO9001 certification, Hemaokang Steel is a dependable partner for your raw material needs. We are committed to delivering precision-engineered steel rods that enhance your product's performance and reduce your production costs. Contact us today to request a quote or discuss your technical requirements. Our team is ready to provide you with prompt, professional service.
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