Round Steel Bar
Product Overview
Round steel bar serves as a primary industrial raw material for CNC machining, automotive drivelines, fluid power systems, and heavy equipment manufacturing. Produced via primary electric arc furnace (EAF) melting, ladle refining, and systematic hot-rolling, forging, or cold-drawing, these solid metal bars provide the structural integrity and machinability required for critical OEM components.
Operating integrated rolling mills and forging presses, we supply industrial-grade round bars in diameters ranging from 10 mm to 1000 mm. Every production batch complies with global metallurgical standards (ASTM, EN, JIS, GB) and is delivered with verifiable EN 10204 3.1 Mill Test Certificates.
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Technical Specifications
|
Parameter |
Specification Details |
|
Diameter Range |
Hot Rolled: 16 mm - 500 mm Forged: 150 mm - 1000 mm Cold Drawn: 10 mm - 80 mm |
|
Standard Lengths |
3m, 5.8m, 6m, 12m, or custom cut-to-length (±2 mm) |
|
Steel Grades |
Carbon Steel: AISI 1018, 1045, 1020, 1035 Alloy Steel: AISI 4140, 4340, 8620, 5140 Stainless Steel: 304/304L, 316/316L, 410, 420, 17-4PH |
|
Delivery Condition |
Hot Rolled (HR), Annealed (A), Normalized (N), Quenched & Tempered (Q+T), Cold Drawn (CD) |
|
Dimensional Tolerance |
Hot Rolled: ASTM A29 / EN 10060 Cold Drawn: h9, h11, h13 |
|
Surface Finish |
Black, Peeled, Turned & Polished (T&P), Centerless Ground (CG) |
Product Advantages
Strict Dimensional Control:
Multi-roll straightening and centerless grinding achieve tight diameter tolerances (h9/h11), minimizing machining stock allowance and setup time for CNC operations.
Homogeneous Microstructure:
Inline temperature-controlled rolling and thermal annealing eliminate internal mechanical stress, ensuring uniform hardness across the entire cross-section.
Low Inclusion Metallurgy:
Vacuum degassing and ladle refining control sulfur and phosphorus limits, preventing subsurface defects during deep drilling, boring, or turning.
Direct Mill Integration:
Operating 3 hot-rolling lines and 2 heavy forging presses ensures stable volume output, flexible alloy chemistry adjustments, and competitive factory pricing.
Power Transmission: Rotors, drive shafts, spindles, and gear blanks for industrial gearboxes and automotive drivelines.
Fluid Power: Piston rods, hydraulic cylinders, and high-pressure valve components requiring superior tensile strength.
Fastener Manufacturing: High-strength bolts, studs, anchor rods, and specialized industrial fasteners.
General Engineering: Machined pins, rollers, structural columns, and OEM equipment replacement parts.
Customization & Processing
Precision Saw Cutting:
High-speed automatic band saws provide square-cut ends with zero burrs, holding fixed lengths within ±1 mm for direct machine loading.
Thermal Processing:
In-house heat treatment furnaces execute full annealing, normalizing, quenching, and tempering to hit target Brinell (HB) or Rockwell (HRC) hardness specs.
Surface Peeling & Grinding:
Removes surface decarburization, micro-fissures, and mill scale, supplying clean bright steel bars ready for automated production lines.
Custom Chemistry:
Tailored alloy adjustments available for specific mechanical property requirements based on minimum order quantities (MOQ).
Quality Control & Inspection
Manufacturing operations are strictly executed under ISO 9001:2015, IATF 16949, and PED 2014/68/EU certified quality management systems to guarantee regulatory compliance for pressure equipment and automotive supply chains.
Chemical Analysis: Direct-reading optical emission spectrometer (OES) verifies melt chemistry prior to downstream rolling or forging.
Mechanical Testing: Universal testing machines measure tensile strength, yield strength, elongation, and reduction of area, backed by Brinell and Rockwell hardness testers.
Non-Destructive Testing (NDT): 100% automated ultrasonic testing (UT) detects internal micro-voids and inclusions in compliance with ASTM A388 and EN 10302.
Dimensional Verification: Laser micrometers monitor online diameter consistency, supplemented by surface roughness profilometer checks.
Secure Bundling: High-tensile steel strapping secures bars into 2,000 kg to 3,000 kg bundles, optimized for safe overhead crane handling at customer facilities.
Corrosion Defense: Industrial anti-rust oil is applied to all bright and ground bars; optional VCI (Volatile Corrosion Inhibitor) paper lining and waterproof wrapping protect shipments during ocean transit.
End Protection: Heavy-duty plastic caps are fitted onto precision-machined or ground bar ends to prevent impact deformation during long-haul transport.
Logistics Flexibility: Containerized shipping (20GP/40GP) for standard lengths, or bulk break-bulk vessel chartering for oversized forged bars.
FAQ & Request a Quote
Request a Quote
Provide your required steel grade, diameter, length, delivery condition, and destination port to receive a commercial quotation within 24 hours.
[Request a Quote Form / Contact Engineering Sales]
As one of the most professional round steel bar manufacturers and suppliers in China, we're featured by quality products and low price. Please rest assured to buy high-grade round steel bar in stock here from our factory.