Hot Rolled and Cold Drawn Steel Round Bar
Specification
| Parameter | Range / Options |
| Diameter | 6 mm: 500 mm (1/4": 24") |
| Length | 3 m: 12 m (standard: 6m) |
| Tolerance Standards | EN 10277, ASTM A29, JIS G3124 |
Material Standard
| Material Type | Standard | Common Grades |
| Carbon Steel | ASTM A36 / A29 | A36, 1018, 1045, 1215 |
| EN 10083 / 10025 | S235JR, S355JR, C45 | |
| JIS G3101 / G4051 | SS400, S45C, SCM435 | |
| Stainless Steel | ASTM A276 / A484 | 304/L, 316/L, 303, 310S, 630 (17-4PH) |
| EN 10088 | 1.4301, 1.4401, 1.4305 | |
| Alloy Steel | ASTM A29 | 4140, 4340, 8620 |
| EN 10084 | 16MnCr5, 20MnCr5 | |
| Tool Steel | ASTM A681 | O1, D2, A2, M2 |
| Aluminum | ASTM B221 | 6061, 6063, 7075, 2024 |
| Brass / Bronze | ASTM B16 / B124 | C36000, C46400 |
Manufacturing Methods
Hot Rolling:
Steel is heated above recrystallization temperature (approximately 1200°C) and passed through rolling mills. This process produces bars with lower dimensional accuracy and a scaled surface, but offers cost-effectiveness suitable for construction and general applications where finish is not critical.
Cold Rolling / Drawing:
Hot-rolled bars are pulled through dies at room temperature, resulting in superior surface finish, tighter dimensional tolerances, and increased strength. These bars are ideal for precision components and machined parts.
Peeling:
The surface layer is removed by cutting to achieve high dimensional accuracy, a glossy finish, and defect-free surface condition.
Centerless Grinding:
Bars are ground to precise diameter tolerances, providing extreme precision, excellent straightness, and a polished surface for demanding applications.
Extrusion:
Common for aluminum and copper, where billets are forced through a die opening to produce long lengths with consistent cross-sections.
Applications
Machinery and Mechanical Components:
Round bars are extensively used to manufacture shafts, gears, spindles, rollers, pins, and bushings. Their cylindrical shape makes them ideal for rotating parts and components requiring symmetry.
Automotive Industry:
Essential for producing axles, drive shafts, steering components, piston rods, and fasteners. High-strength alloy grades are specified for critical drivetrain applications.
Construction and Infrastructure:
Used as reinforcing bars, column supports, braces, and anchors. Hot-rolled round bars provide reliable strength for structural frameworks.
Oil and Gas Industry:
Employed in downhole tools, valve components, pump shafts, and wellhead equipment. Corrosion-resistant stainless and alloy grades perform in harsh environments.
Aerospace and Defense:
Precision-ground bars serve in landing gear components, turbine shafts, structural connectors, and fasteners where strict tolerances and high reliability are required.
Manufacturing and Fabrication:
Raw material for CNC machining, turned parts, bolts, studs, and custom components across all industries.
Marine and Offshore:
Stainless steel and naval brass round bars provide corrosion resistance for hardware, fittings, shafts, and structural elements in marine environments.
Energy and Power Generation:
Used in turbine components, generator shafts, and nuclear reactor internals, often in specialized high-temperature alloys.
Medical and Pharmaceutical:
Stainless steel round bars are specified for surgical instruments, implants, and medical device components requiring biocompatibility and cleanability.
Food Processing:
Sanitary-grade stainless steel bars serve in equipment frames, conveyor components, and processing machinery where hygiene is critical.