Product Overview
Stainless steel flat bars are solid rectangular metal sections produced via hot rolling, cold drawing, or laser cutting. Applied as structural members, base plates, and raw stock for machined components, they deliver high tensile strength, resistance to chemical and atmospheric corrosion, and clean surface aesthetics.
Production integrates electric arc furnace (EAF) melting, precision rolling mills, and multi-stage roller straightening lines to control thickness variation, edge squareness, and internal residual stress. Every production batch carries verifiable EN 10204 3.1 Mill Test Certificates.
Technical Specifications
|
Parameter |
Specification Details |
|
Standard Grades |
Austenitic: 304, 304L, 316, 316L, 321 Duplex: 2205 (UNS S32205 / S31803) Martensitic: 410, 420 |
|
Manufacturing Standards |
ASTM A276 / A484, ASME SA276, EN 10088-3, JIS G4318 |
|
Thickness Range |
3.0 mm - 50.0 mm (0.118 inch - 1.968 inch) |
|
Width Range |
10.0 mm - 200.0 mm (0.393 inch - 7.874 inch) |
|
Standard Lengths |
3.0m, 5.8m, 6.0m, or cut-to-length as specified |
|
Surface Finishes |
Hot Rolled Annealed & Pickled (No. 1), Cold Drawn (2B/Cold Finished), Polished (#4 / Grit 180-320) |
|
Tolerances |
ASTM A484 / EN 10279 standard tolerances (precision tolerance up to h11 available upon request) |
Product Advantages
Dimensional Stability:
Roller-leveled and precision-straightened to maintain camber and twist within tight industrial limits, reducing secondary machining setup time.
Corrosion Resistance:
Controlled chromium and nickel chemistry forms a stable passive oxide film, preventing oxidation in chemical, marine, and food-processing environments.
Weldability:
Low carbon variants (304L / 316L) suppress carbide precipitation during GTAW/GMAW welding, preserving corrosion resistance at heat-affected zones.
Traceability:
Permanent heat number stamping on individual bars linked directly to digital MTC records via barcode tracking.
Applications
Industrial Machinery: Machine tool beds, structural support frames, guide rails, and mounting brackets.
Food & Pharmaceutical Equipment: Conveyor system components, mixing tank reinforcement rings, and sanitary processing skids.
Chemical & Marine Engineering: Valve bodies, pump bases, fasteners, and seawater desalination structural fixtures.
Architectural & Construction: Handrails, facade anchoring systems, and heavy structural trim.
Customization & Processing
End-to-end processing services reduce scrap rates and streamline manufacturing workflows prior to final assembly:
Cutting Services: High-speed band sawing, laser cutting, and plasma cutting for exact cut-to-length blanks.
Surface Treatments: Mechanical polishing, brushing, and passivation treatments to eliminate free iron and enhance passive film recovery.
Edge Conditioning: Deburred edges, radius rounding, and chamfering to meet safety and assembly requirements.
Custom Tolerances: Tight-tolerance cold-drawn sizing executed on multi-die drawing benches.
Quality Control & Inspection
Manufacturing operations comply with ISO 9001 quality management standards. The in-house testing facility executes:
Chemical Analysis: Optical Emission Spectrometer (OES) verification performed on every heat.
Mechanical Testing: Tensile strength, yield strength, elongation, and Brinell/Rockwell hardness testing.
Dimensional Inspection: Laser micrometer measurement verifying thickness, width, edge squareness, and straightness.
Defect Detection: Eddy current testing or ultrasonic testing for internal flaws on critical structural grades.
Packaging & Shipping
Standard export packaging prevents transit corrosion and mechanical damage during international ocean freight:
Bundling:
Bundled with heavy-duty steel strapping and reinforced with protective wooden spacers.
Surface Protection:
Interleaved with anti-rust paper or wrapped in waterproof moisture-barrier plastic film.
Crating:
Fumigation-free wooden boxes or robust iron frames applied for heavy gauge or precision-finished bars.
Logistics:
Direct container loading from the manufacturing facility to major ports with complete packing lists and shipping documentation.
FAQ
Q: What is the difference between 304 and 316 stainless steel flat bars?
A: Grade 304 contains 18 percent chromium and 8 percent nickel, suitable for general atmospheric and food-grade environments. Grade 316 adds 2 percent molybdenum, which increases resistance to chlorides, marine atmospheres, and industrial chemical exposure.
Q: Can you provide Mill Test Certificates (MTC) prior to shipment?
A: Yes. EN 10204 3.1 MTCs detailing chemical composition, mechanical test results, and heat numbers are supplied digitally upon order dispatch and can be provided in advance upon request.
Q: What are your standard minimum order quantities (MOQ)?
A: For standard stock dimensions and grades (304/316, standard thicknesses), the MOQ is 1 metric ton per size. For custom dimensions, non-standard grades, or specific cut lengths, MOQs are evaluated based on rolling schedules.
Q: Do you provide cut-to-length services, and what are the length tolerances?
A: Yes. Band saws and laser cutting lines operate to standard cut-to-length tolerances of +/- 2.0 mm, with tighter tolerances down to +/- 0.5 mm available for machined components.
Q: How do you protect the flat bars from surface damage during sea freight?
A: Bars are bundled with steel straps, wrapped in moisture-resistant plastic film, and separated by wooden battens. For polished finishes, individual PVC protective masking or crating is applied.
Q: What international standards do your stainless steel flat bars comply with?
A: Products comply with ASTM A276, ASTM A484, ASME SA276, and EN 10088-3. Material certification and third-party inspection (SGS, BV, TUV) can be arranged prior to shipment.
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