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Help CenterASTM A36 Carbon Steel Round Bar Hot Rolled 10mm-300mm Diameter for Structural Support
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Welcome to Hemaokang Steel (Shandong) Co., Ltd. – We are a professional manufacturer and exporter of high-quality carbon steel products. Our ASTM A36 Carbon Steel Round Bar Hot Rolled is engineered for structural support applications, offering excellent strength, weldability, and machinability. With diameter sizes ranging from 10mm to 300mm, this round bar is a versatile choice for construction, bridges, industrial frameworks, and general fabrication. Backed by our ISO9001 quality management system and over US$50 million annual export value, we ensure consistent quality and reliable supply to global customers.
Our hot-rolled round bars are manufactured in strict compliance with ASTM A36/A36M standards, ensuring that each bar meets the required mechanical properties. The hot rolling process gives the bar a scale-free surface and improved ductility, making it ideal for welding and forming. Whether you need short lengths for custom projects or long runs for large-scale construction, we offer flexible cutting and packaging options to meet your specific requirements.
Key Features & Technical Specifications
- Material Grade: ASTM A36 – a widely used carbon steel grade with good strength and formability.
- Diameter Range: 10mm – 300mm (other sizes available upon request).
- Length: Standard 6m, 12m, or custom cut to your specifications.
- Surface Condition: Hot rolled with black finish; optional pickled & oiled for improved appearance.
- Mechanical Properties: Yield strength ≥ 250 MPa, Tensile strength 400–550 MPa, Elongation ≥ 20%.
- Weldability: Excellent – suitable for most welding processes (MIG, TIG, arc welding).
- Machinability: Good – can be easily drilled, turned, and milled.
- Application: Structural support beams, columns, trusses, bridges, industrial machinery, and general fabrication.
Typical Mechanical Properties (ASTM A36)
| Property | Value |
|---|---|
| Tensile Strength | 400 – 550 MPa |
| Yield Strength (min) | 250 MPa |
| Elongation in 200mm (min) | 20% |
| Brinell Hardness (typical) | 119 – 159 HB |
Our ASTM A36 round bars are produced with precise dimensional control. The standard tolerance for diameter is ±0.5mm for sizes up to 100mm, and ±1.0mm for larger diameters. Length tolerance is +0mm / +50mm for standard lengths. We also offer straightness correction to meet your specific requirements.
Benefits for Your Structural Projects
- Cost-Effective: ASTM A36 offers a good balance of strength and cost, making it a popular choice for large-scale construction.
- Easy to Fabricate: Excellent weldability and machinability reduce labor time and tool wear.
- Wide Availability: With diameters from 10mm to 300mm, we can meet diverse project needs with short lead times.
- Reliable Supply: As a company with annual export value over US$50 million and 51-100 experienced employees, we ensure consistent quality and timely delivery.
- Customizable: We offer cutting, threading, chamfering, and surface treatment options to match your exact specifications.
Our production facility in Liaocheng, Shandong, China, is equipped with advanced hot rolling mills and quality testing equipment. Each batch of round bars undergoes chemical composition analysis and mechanical property testing to ensure compliance with ASTM A36. We also provide Mill Test Certificates (MTC) upon request.
Trust & Quality Assurance
Hemaokang Steel (Shandong) Co., Ltd. is committed to delivering excellence. We are certified under ISO9001 quality management system, which governs our production, inspection, and customer service processes. Our products have been exported to North America, South America, Europe, Southeast Asia, Africa, Oceania, the Middle East, and many other regions. With a dedicated team of 51-100 professionals, we ensure that every order is handled with care and precision.
We understand that structural support projects demand material reliability. That is why we source premium steel billets and maintain strict process control. Whether you are a steel distributor, fabricator, or construction company, our ASTM A36 round bars will meet your performance and budget expectations.
Contact us today for a quote or to discuss your custom requirements. We offer competitive pricing, flexible shipping terms (FOB, CIF, CFR, etc.), and samples for approval. Let Hemaokang Steel be your trusted partner in carbon steel solutions.
Frequently Asked Questions (FAQ)
-
What is the tolerance on diameter?
Standard tolerance is ±0.5mm for diameters up to 100mm, and ±1.0mm for 101mm–300mm. Tighter tolerances are available upon request. -
Can you cut the round bars to specific lengths?
Yes, we offer custom cutting to any length from 1m to 12m, with a tolerance of +0mm / +50mm. -
Is the surface pickled and oiled or black?
Standard is hot rolled black finish. Pickled and oiled (P&O) is available as an option to remove scale and improve appearance. -
What welding methods are suitable for this steel?
ASTM A36 is compatible with most common welding processes including MIG, TIG, stick welding, and flux-cored arc welding. Preheating is generally not required for thicknesses under 20mm. -
Do you provide a Mill Test Certificate?
Yes, a Mill Test Certificate (MTC) is provided with each shipment, confirming chemical composition and mechanical properties. -
What is the minimum order quantity?
For standard sizes, the MOQ is 1 ton per size. For special sizes or custom lengths, please contact us for details. -
How long does delivery take?
Typical delivery time is 15–30 days after order confirmation, depending on quantity and size. For urgent orders, express production can be arranged. -
Can I request a sample before bulk order?
Absolutely. We can provide free samples (freight collect) for evaluation. Please contact our sales team to arrange.
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