Product Description

We specialize in supplying ASTM A36 hot-rolled carbon steel round bars, fully compliant with the American Society for Testing and Materials (ASTM) standards. As a classic low-carbon structural steel, A36 offers excellent weldability, reliable tensile strength, and good machinability. Manufactured through high-temperature continuous rolling, the bars feature a dense microstructure, stable mechanical properties, and a natural mill scale surface. Widely used in steel construction, machinery manufacturing, bridge engineering, automotive components, and general hardware fabrication. Custom length cutting, peeled/turned finishes, and export-grade anti-rust packaging are available.

Product Specifications

Standard: ASTM A36

Diameter Range: 0.1mm - 500mm (Common sizes in stock)

Chemical Composition: C≤0.25% | Mn 0.75-1.05% | P≤0.04% | S≤0.05% | Si 0.15-0.40%

Mechanical Properties: Yield Strength ≥250 MPa (36 ksi) | Tensile Strength 400-550 MPa | Elongation ≥20%

Surface Finish: Hot-rolled mill scale | Optional peeling / turning / shot blasting

Standard Length: 6m / 9m / 12m (Custom cutting available, tolerance ±2mm)

Packaging: Anti-rust paper + steel strapping / moisture-proof pallet / fumigated wooden crate / VCI vacuum film (Export standard)

Key Features

100% ASTM A36 Compliant

Chemical composition & mechanical properties strictly meet US standards, ensuring batch-to-batch consistency for North American & global structural procurement.

Excellent Weldability & Machinability

Low-carbon design allows welding without preheating; smooth turning, milling, drilling, and tapping with clean chip breakage, ideal for fast production.

Hot-Rolled Quality Assurance

High-temperature rolling refines grain structure, eliminates internal stress, and ensures excellent straightness & concentricity, reducing machining allowances.

Full Size Range & Fast Dispatch

0.1mm-500mm mainstream diameters kept in stock, supporting 3-7 day quick delivery to shorten your production cycle.

Flexible Customization & Inspection

Custom cutting, chamfering, deburring, anti-rust packaging, and third-party inspection (SGS/Intertek) available upon request.

Applications

Steel structures & bridge engineering components

Machinery frames, bases & drive shafts

Fasteners, connectors & standard parts manufacturing

Automotive chassis, suspension links & structural parts

Hardware tools, mold inserts & fixture guide rails

Shipbuilding, offshore engineering & heavy equipment

Why Choose Us?

Direct Mill Sourcing, Transparent Pricing

Direct partnerships with top-tier domestic mills eliminate middlemen, ensuring competitive pricing and long-term supply stability.

Full-Process ISO Quality Control

Strict control from melt composition, rolling temperature curves to final dimensional/NDT inspection. ISO 9001 certified. Mill Test Certificate (MTC) provided with every shipment.

Fast Response & Flexible Delivery

3-7 days for standard stock; urgent orders supported. Flexible for multi-batch & small-quantity procurement to match your production rhythm.

Proven Export Experience

Familiar with ocean freight standards, customs clearance, and compliance. Proficient in COO, SGS inspection, CIPL, and full export documentation for smooth global delivery.

Technical Selection & Processing Support

In-house materials engineering team provides heat treatment recommendations, tolerance optimization, and alternative grade solutions based on drawings/applications.

FAQ

Q1: What’s the difference between ASTM A36 and 1018/1020? Can they be substituted?

A: A36 is a structural steel standard focused on yield strength & weldability, while 1018/1020 are cold-drawn/machining steel standards. They can be partially interchangeable for general fabrication, but A36 is superior for welded load-bearing structures.

Q2: Does the mill scale surface affect welding or machining?

A: No. The natural oxide layer aids chip evacuation during machining. For welding, light grinding or pickling before use is sufficient. For bright finishes, we offer peeling or turning services.

Q3: What is the diameter tolerance? Can tighter tolerances be achieved?

A: Standard hot-rolled tolerance: ±0.5~±1.0mm (varies by diameter). For ±0.1mm or tighter, we recommend upgrading to cold-drawn round bars or precision turning.

Q4: Can you provide material certificates & third-party testing?

A: Yes. Every batch includes the original Mill Test Certificate (MTC). Third-party testing (SGS/Intertek/CTI) for chemical composition & mechanical properties is available upon request.

Q5: What is the MOQ and lead time?

A: Standard grades MOQ: 5-10 tons per diameter. In-stock items ship in 3-7 days. Custom cutting/special packaging takes 10-15 days, confirmed per order.

Q6: How is export packaging protected against rust & moisture?

A: Standard export packing uses moisture-proof anti-rust paper + steel strapping + pallet/fumigated crate. Optional VCI vacuum film available. Fully compliant with seaworthy & salt-spray resistance standards.