Product Overview
Carbon steel flat bars serve as foundational structural and mechanical components across industrial manufacturing. Produced via hot rolling or cold drawing, these bars offer predictable machinability, structural rigidity, and weldability. Standard inventory supports immediate processing or direct structural integration into OEM assemblies, machinery frames, and load-bearing brackets.
Technical Specifications
|
Parameter |
Standard Specification |
|
Material Grades |
ASTM A36 / ASME SA36, AISI 1018 / 1045, EN 10025 S235JR / S355JR, JIS G3101 SS400 |
|
Production Process |
Hot Rolled (HR) / Cold Drawn (CD) / Annealed |
|
Thickness Range |
3 mm to 100 mm (1/8 inch to 4 inches) |
|
Width Range |
10 mm to 300 mm (3/8 inch to 12 inches) |
|
Standard Length |
5.8m, 6m, 12m, or precision cut-to-length |
|
Tolerances |
ASTM A484 / EN 10058 / ISO 9445 standards |
|
Surface Finish |
Black (Hot Rolled), Pickled & Oiled (P&O), Cold Drawn Bright |
|
Mill Test Reports |
EN 10204 3.1 certification provided per heat lot |
Product Advantages
Strict Dimensional Stability:
Multi-roller straightening equipment and controlled rolling parameters maintain tight thickness, width, and straightness tolerances (<= 0.5 mm/m), minimizing secondary machining setup times.
Weldability & Formability:
Low-to-medium carbon grades (such as ASTM A36 and AISI 1018) permit standard MIG, TIG, and stick welding without requiring pre-heating.
Consistent Mechanical Properties:
Uniform grain structure across the cross-section ensures predictable yield and tensile strength under industrial operating conditions.
Traceable Metallurgy:
Every production heat links directly to in-house optical emission spectrometer chemical analysis reports, eliminating material inconsistency risks in structural applications.
Applications
Industrial Machinery: Machine bases, slide rails, structural mounting plates, and equipment enclosures.
Automotive & Transport: Trailer frames, hitch assemblies, and structural reinforcement brackets.
Construction & Infrastructure: Embedded plates, lintels, grating supports, and architectural framework elements.
Metal Fabrication: Flanges, gussets, clamps, and custom machined components.
Customization & Processing
Manufacturing capabilities extend beyond stock mill lengths to match specific fabrication requirements under ISO 9001 certified protocols:
Precision high-speed cold saw cutting and laser sizing to exact lengths with tight length tolerances (+/- 0.5 mm).
Mechanical shot blasting, anti-rust oil application, and acid pickling to remove mill scale prior to customer painting or plating.
Square edge, deburred edges, or custom radiused corners available upon request.
Quality Control & Inspection
Internal manufacturing protocols verify product integrity at three distinct operational stages:
Raw Material Verification: In-house optical emission spectrometer testing confirms chemical composition against mill sheets prior to processing.
Dimensional Monitoring: Automated micrometer checks and laser profile measurement verify thickness, width, and straightness deviations during production runs.
Mechanical Testing: Universal testing machines verify tensile strength, yield strength, and elongation per lot in accordance with ASTM/EN standards. Third-party inspection (SGS, BV, TUV) welcomed prior to dispatch.
Packaging & Shipping
Bundling:
Securely strapped with high-tensile steel bands into 1-to-3 metric ton lifts to prevent transit shifting.
Protection:
Wooden dunnage applied underneath bundles for forklift handling; industrial anti-rust oil applied to bare steel surfaces for ocean freight protection.
Loading:
Optimized for 20GP/40GP containers with moisture-absorbing desiccant bags, or bulk breakbulk shipping to minimize transit corrosion.
FAQ
Q: What is the difference between hot-rolled and cold-drawn carbon steel flat bars?
A: Hot-rolled bars feature scaled surfaces and broader dimensional tolerances, suited for general structural use. Cold-drawn bars offer tighter tolerances, a smooth finish, and higher yield strength due to cold working.
Q: Do you provide Mill Test Reports (MTRs) with shipments?
A: Yes. Every order ships with an EN 10204 3.1 Mill Test Report detailing chemical composition, mechanical test results, and heat numbers traceable to raw steel billets.
Q: Can you supply cross-referenced equivalents for American and European standards?
A: Yes. We regularly supply material certified to dual or multi-standards (e.g., ASTM A36 matched with EN 10025 S235JR/S355JR) to fit international project blueprints.
Q: What is the standard MOQ for custom dimension orders?
A: Minimum order quantities depend on the grade and dimensions, typically starting at 3 metric tons per size for non-standard production runs or specialized thickness requirements.
Q: How are the flat bars protected against rust during ocean transport?
A: Bars receive an application of corrosion-inhibiting industrial oil, are tightly strapped, and container shipments are packed with industrial desiccant bags to prevent condensation damage.
Q: Do you accommodate third-party pre-shipment inspections?
A: Yes. We regularly cooperate with independent inspection agencies such as SGS, BV, and TUV designated by international buyers.
Request a Quote
Submit material specifications, required international standards, quantities, and destination port to receive a formal commercial quotation within 24 hours.
Email: ellie_dong@126.com
Required RFQ Details: Standard/Grade, Thickness x Width x Length, Quantity (Tons/Pieces), Destination Port.
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