Flat Steel Bar
Product Overview
Flat steel bars function as structural components and base stock for machinery manufacturing, structural framing, and component fabrication. Produced via hot rolling, cold drawing, or forging, these bars provide uniform cross-sections with predictable mechanical performance. Supplied as direct mill production runs or immediate spot-inventory fulfillment based on OEM specifications and project timelines.
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Technical Specifications
Procurement relies on verified material grades, dimensional tolerances, and execution standards.
Standard Grades:
ASTM A36, AISI 1045, AISI 4140, EN S275JR, S355JR, C45
Thickness Range:
3 mm to 100 mm (0.12 in to 4.0 in)
Width Range:
10 mm to 300 mm (0.40 in to 12.0 in)
Standard Lengths:
3 meters, 6 meters, 12 meters, or custom cut lengths (+/- 2 mm tolerance)
Edge Types:
Square edge (slit or sheared), mill edge, and deburred edges
Execution Standards:
ASTM A6 / A6M, EN 10058, DIN 1017
Product Advantages
Dimensional Stability:
Controlled rolling and cooling parameters minimize residual stress, reducing warping during subsequent machining or laser cutting.
Consistent Mechanical Properties:
Tensile strength, yield strength, and elongation verified per heat number via destructive testing.
Weldability:
Low carbon variants (e.g., A36, S275JR) deliver predictable fusion welding performance without pre-heating for standard thicknesses.
Surface Condition:
Scale-free options available via shot blasting and inline pickling, ready for immediate priming or CNC machining.
Machinery & Equipment: Base plates, structural gantry frames, conveyor guide rails, and motor mounts.
Structural Engineering: Building bracing, bridge components, grating support bars, and stair stringers.
Automotive & Transportation: Trailer chassis reinforcement, leaf spring components, and hitch assemblies.
Agricultural Machinery: Tillage tool shanks, frame brackets, and implement wear plates.
Customization & Processing
Cutting Services:
High-speed cold sawing and band saw cutting for exact length requirements with minimal burrs.
Surface Treatments:
Hot-dip galvanizing (HDG), black oxide, anti-rust oil coating, and shot blasting (Sa 2.5 standard).
Edge Conditioning:
Chamfering, radius edge milling, and thermal edge smoothing.
eat Treatment:
H Annealing, normalizing, and quench-and-tempering (Q&T) for alloy grades like 4140.
Quality Control & Inspection
Manufacturing processes integrate inline and offline verification to eliminate dimensional and metallurgical defects, with full accommodation for third-party inspections (e.g., SGS, TÜV, BV) prior to shipment.
Dimensional Verification: Laser micrometer gauging monitors thickness and width continuously across the rolling line. Straightness and camber checked on flat verification tables.
Chemical Analysis: Spectrometric testing performed on every heat ladle to confirm carbon, manganese, silicon, sulfur, and phosphorus limits conform to ASTM/EN specifications.
Mechanical Testing: Tensile testing machines and Charpy V-notch impact testers verify yield strength, ultimate tensile strength, and impact toughness.
Traceability: Each bundle stamped with heat numbers and accompanied by an EN 10204 3.1 Mill Test Certificate (MTR) prior to release.
Packaging & Shipping
Bundling: Secured with high-tensile steel strapping at intervals preventing sag or shifting during transit.
Protection: Woven polypropylene wrapping applied for corrosion-sensitive grades or sea freight shipments. ISPM 15 compliant heat-treated wooden dunnage and pallets utilized for international customs compliance.
Export Terms & Logistics: Containerized loading and break-bulk shipping coordinated from major export ports, supporting standard commercial terms (FOB, CIF, CFR).
Marking: Weatherproof metal tags displaying steel grade, heat number, dimensions, bundle weight, and PO number.
FAQ & Request a Quote
Request a Quote
Provide your required steel grade, dimensions (thickness x width x length), quantity, destination port, and preferred trade term (FOB/CIF) to receive a formal quotation with mill lead times and certified test documentation within 24 hours.
As one of the most professional flat steel bar manufacturers and suppliers in China, we're featured by quality products and low price. Please rest assured to buy high-grade flat steel bar in stock here from our factory.