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China Suppliers Factory Hot Rolled and Cold Drawn Steel Round Bar for Industrial Applications

Round bars, commonly referred to as round steel bars or steel rods, are essential components in various industrial and construction applications. Manufactured in China, these long, cylindrical metal bars feature a solid circular cross-section and are available in an extensive range of diameters, materials, and finishes. As one of the most versatile forms of steel products, round bars can be produced through hot rolling or cold finishing processes, each providing unique characteristics tailored for specific uses. When searching for reliable suppliers and factories for high-quality round bars, our offerings stand out, ensuring durability and performance for your projects

Product Details

Specification

Parameter	Range / Options
Diameter	6 mm – 500 mm (1/4" – 24")
Length	3 m – 12 m (standard: 6 m)
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 & 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 & Infrastructure

Used as reinforcing bars, column supports, braces, and anchors. Hot-rolled round bars provide reliable strength for structural frameworks.

Oil & Gas Industry

Employed in downhole tools, valve components, pump shafts, and wellhead equipment. Corrosion-resistant stainless and alloy grades perform in harsh environments.

Aerospace & Defense

Precision-ground bars serve in landing gear components, turbine shafts, structural connectors, and fasteners where strict tolerances and high reliability are required.

Manufacturing & Fabrication

Raw material for CNC machining, turned parts, bolts, studs, and custom components across all industries.

Marine & Offshore

Stainless steel and naval brass round bars provide corrosion resistance for hardware, fittings, shafts, and structural elements in marine environments.

Energy & Power Generation

Used in turbine components, generator shafts, and nuclear reactor internals, often in specialized high-temperature alloys.

Medical & 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.

Frequently Asked Questions

Q What diameter range is available for round bars?

Round bars are available in diameters ranging from 6 mm to 500 mm (1/4" to 24"), with standard lengths between 3 m and 12 m. The most common stock length is 6 m.

Q What is the difference between hot-rolled and cold-drawn round bars?

Hot-rolled bars are produced at high temperatures and have a scaled surface with lower dimensional accuracy, making them cost-effective for structural use. Cold-drawn bars are processed at room temperature, resulting in a superior surface finish, tighter tolerances, and higher strength — ideal for precision machined components.

Q Which material grade should I choose for corrosion-resistant applications?

For corrosion resistance, stainless steel grades such as 304, 316, or 316L are recommended. Grade 316/316L offers superior resistance to chlorides and marine environments. For extreme conditions, duplex or super-duplex grades may be considered.

Q What tolerance standards do your round bars conform to?

Our round bars conform to internationally recognized tolerance standards including EN 10277 (European), ASTM A29 (American), and JIS G3124 (Japanese), ensuring compatibility with global engineering specifications.

Q What manufacturing method provides the highest dimensional accuracy?

Centerless grinding provides the highest dimensional accuracy and the best surface finish among all manufacturing methods. It delivers extreme precision in diameter tolerances and excellent straightness, making it suitable for the most demanding engineering applications.

Q Are round bars suitable for food processing and medical applications?

Yes. Sanitary-grade stainless steel round bars (typically 304 or 316L) are widely used in food processing equipment, pharmaceutical machinery, surgical instruments, and medical implants due to their biocompatibility, cleanability, and resistance to contamination.