Hot Rolled Plain Round Steel Bar , Mild Steel Round Rod Q235B SS400 A36 1045
Hot Rolled Plain Round Steel Bar — Product Description
Product Overview
Hot rolled plain round steel bars (also known as mild steel round rods or round bars) are solid, circular-section steel products with a smooth surface and no ribs or deformations. Produced by hot rolling, they are widely used in construction, machinery manufacturing, fastener production, and general engineering. With excellent machinability, weldability, and formability, plain round bars are one of the most basic and versatile steel products in the industry.
Available in grades Q235B, SS400, A36, 1045, S45C, and 1020, our round steel bars meet the requirements of various international standards including GB/T 702, JIS G3101, ASTM A36, and EN 10025.
Key Specifications
| Parameter | Range |
|---|---|
| Diameter | 6mm – 500mm |
| Length | 6m / 9m / 12m, or customized |
| Surface | Black / mill finish, peeled, turned, or polished |
| Supply Condition | Hot rolled, cold drawn, forged, or quenched & tempered |
| Standard | GB/T 702, JIS G3101, ASTM A36, EN 10025 |
| Package | Bundles with steel strips, or as required |
Grade & Standard Equivalents
| Grade | Standard | Yield Strength (MPa) | Tensile Strength (MPa) | Typical Application |
|---|---|---|---|---|
| Q235B | GB/T 700 | ≥235 | 370–500 | General structure, construction |
| SS400 | JIS G3101 | ≥245 | 400–510 | Building frames, machinery |
| A36 | ASTM A36 | ≥250 | 400–550 | Structural steel, bridges |
| 1045 | ASTM A29 | ≥310 | ≥565 | Shafts, gears, bolts, axles |
| S45C | JIS G4051 | ≥345 | ≥600 | Machinery parts, shafts |
| 1020 | ASTM A29 | ≥210 | ≥380 | Fasteners, general machining |
| Q345B | GB/T 1591 | ≥345 | 470–630 | Heavy-duty structures |
Key Features
- Smooth Surface — Plain round profile, suitable for machining and threading
- Good Machinability — Easy to cut, drill, turn, and thread
- Excellent Weldability — Suitable for welding and fabrication
- High Strength Options — 1045 and S45C offer higher strength for mechanical parts
- Versatile Surface Treatment — Black, peeled, turned, or polished
- Cost-Effective — Economical choice for large-volume applications
Typical Applications
- Construction & Building: Structural supports, bracing, anchors
- Machinery Manufacturing: Shafts, axles, gears, spindles, pins
- Fastener Production: Bolts, nuts, screws, studs
- Automotive Parts: Connecting rods, steering components
- General Engineering: Fencing, gates, handrails, decorative purposes
Quality Assurance
- Mill Test Certificate provided with each shipment
- Chemical Composition & Mechanical Properties tested per heat number
- Dimensional Inspection — diameter, length, and straightness
- Surface Inspection — no cracks, folds, or significant defects
- Third-Party Inspection acceptable (SGS, BV, Intertek, etc.)
Why Choose Our Plain Round Steel Bars
- Full Grade Coverage — Q235B, SS400, A36, 1045, S45C, 1020, Q345B and more
- Wide Size Range — Diameter from 6mm to 500mm, custom lengths available
- Multiple Supply Conditions — Hot rolled, cold drawn, forged, or quenched & tempered
- Flexible Surface Treatment — Black, peeled, turned, or polished as per customer needs
- Stable Quality — Consistent chemical composition and mechanical properties
- Fast Delivery — Large inventory and efficient logistics for prompt shipment
Order Information
- MOQ: 5–25 tons (negotiable)
- Payment Terms: T/T, L/C at sight
- Delivery Time: 7–20 days after deposit
- Packaging: Standard export seaworthy packing — bundled with steel strips, or as customer requirements
- Port of Loading: Tianjin / Qingdao / Shanghai (or as required)
For inquiries, please specify: grade, diameter, length, quantity, surface requirement, and destination port.
Get in Touch
Have questions about our products or want to discuss a custom order? Our team is ready to help you.