Product Overview
Hot Rolled Carbon Steel Bars are produced via continuous casting billets and multi-stand hot rolling mills, transforming raw steel into structural and mechanical profiles. These bars serve as primary industrial feedstocks for forging, CNC machining, and heavy structural fabrication, featuring uniform grain structures and verifiable mechanical performance across production heats.
Technical Specifications
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Parameter Category |
Specification Details |
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Available Profiles |
Round, Flat, Square, Hexagon |
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Common Steel Grades |
Carbon Steel: AISI 1010, 1020, 1045, 1060 Alloy Steel: AISI 4140, 4340, 8620 Structural Steel: S355JR, S355JO, S355J2, Q355B |
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Standard Dimensions |
Round Diameter: 12mm – 300mm Flat Width: 20mm – 300mm, Thickness: 5mm – 80mm Square: 12mm – 200mm |
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Execution Standards |
ASTM A29 / A29M, EN 10083, EN 10025, GB/T 699, GB/T 3077 |
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Surface & Condition |
Hot-rolled scale surface; optional shot-blasted, centerless ground, peeled, or cold-sawn |
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Length Options |
Standard 5.8m, 6m, 11.8m, 12m; custom fixed lengths cut-to-tolerance |
Product Advantages
Inline Dimensional Control:
Laser gauges monitor hot rolling passes continuously, tightening cross-section tolerances and minimizing stock removal requirements for subsequent machining operations.
Controlled Melt Metallurgy:
Primary converter steelmaking and strict continuous casting parameters restrict non-metallic inclusions and centerline segregation.
Predictable Machinability:
Controlled carbon-manganese balancing in structural and medium-carbon grades ensures stable tool wear during high-speed turning and drilling.
Vertical Processing Integration:
Co-located rolling, automated sawing, straightening, and heat treatment lines reduce lead times for semi-finished industrial components.
Applications
Mechanical Engineering: Industrial drive shafts, gears, tie rods, and hydraulic cylinder components.
Automotive Manufacturing: Axle shafts, steering components, suspension links, and forged fasteners.
Construction & Infrastructure: Structural base plates, embedded anchor bolts, and heavy equipment chassis frames.
Energy Sector: Flanges, valve bodies, and structural support components for industrial installations.
Customization & Processing
Saw Cutting:
High-speed automatic band saws deliver square, burr-free cuts with length tolerances restricted to +/- 1 mm.
Surface Peeled & Ground:
Centerless grinding and rough turning remove surface decarburization and mill scale entirely, achieving surface finishes down to Ra <= 3.2 um.
Thermal Treatment:
Roller-hearth annealing, normalizing, and quench-and-tempering (Q&T) lines adjust yield strength, hardness, and impact toughness to exact engineering briefs.
Straightening:
Multi-roll precision straightening presses correct camber and ovality prior to automated assembly line feeding.
Quality Control & Inspection
Chemical Spectrometry: Optical emission spectroscopy is executed on every steel heat prior to rolling to verify carbon, manganese, silicon, sulfur, and phosphorus against standard limits.
Mechanical Verification: Tensile testing, yield strength verification, and Charpy V-notch impact testing are performed on universal test machines per ASTM E8 / ISO 6892.
Non-Destructive Testing (NDT): Automated ultrasonic testing (UT) is available for internal crack detection and defect screening on critical application bars.
Traceability & Certification: Each bundle is stamped with heat numbers and barcoded, backed by Mill Test Certificates (MTC) issued in accordance with EN 10204 3.1.
Packaging & Shipping
Export Bundling:
Secured with high-tensile steel strapping at minimum 4 to 5 intervals per bar length to restrict shifting during handling.
Corrosion Protection:
Optional application of rust-inhibiting water-displacement oil or woven-plastic waterproof wrapping for sea freight shipments.
Loading Protocols:
Flat rack containers and open-top bulk vessels are loaded using certified rigging to prevent permanent bending or surface gouging of long bars.
FAQ
Q: What is the minimum order quantity (MOQ) for custom steel grades and non-standard dimensions?
A: MOQ starts at 5 metric tons per size and grade for rolling schedule integration, though smaller trial quantities can occasionally be fulfilled from active production buffer stock.
Q: How is chemical composition verified against our internal engineering standards?
A: A spectrometer analysis report is generated per casting heat. These actual melt chemistry values are documented directly on the EN 10204 3.1 Mill Test Certificate provided with every shipment.
Q: Can you supply hot rolled bars with peeled or turned surfaces to eliminate mill scale?
A: Yes. In-house turning and centerless grinding lines process round bars down to precise diameter tolerances while removing surface defects and decarburized layers completely.
Q: What is the standard lead time for bulk mill orders?
A: Production lead times range from 25 to 40 days depending on rolling mill scheduling, grade availability, and required secondary processing such as heat treatment or cutting.
Q: Do your bars comply with international pressure equipment or structural directives?
A: Material options comply with ASTM, EN, and ISO standards. Specific PED 2014/68/EU compliance or third-party inspection (SGS, BV, TUV) can be arranged prior to dispatch.
Q: How are the bars protected against corrosion during ocean freight?
A: Standard bundling utilizes high-tensile steel strapping. For ocean transport, anti-corrosion oil coating or woven-plastic protective wrapping is applied upon request to prevent transit oxidation.
Request a Quote
Submit material specifications, required quantities, destination port, and delivery schedules to receive a formal quotation within 24 business hours.
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