Salt Resistant ASTM A240 316L Stainless Steel Coil 2B Finish For Construction
Salt-Resistant ASTM A240 316L Stainless Steel Coil 2B Finish for Construction
Product Description
ASTM A240 316L stainless steel coil (UNS S31603) is an ultra-low-carbon austenitic alloy containing 2–3% molybdenum, specifically developed to resist pitting and crevice corrosion in chloride-bearing environments. The 2B finish is produced by cold rolling, annealing and pickling, yielding a smooth, matte silver-grey surface with low and uniform roughness. Molybdenum is the key differentiator from 304: it stabilizes the passive film in the presence of chlorides, raising the pitting resistance equivalent number (PREN) to approximately 24–26 and dramatically extending service life in coastal and de-icing salt exposure. The carbon content is capped at 0.03%, eliminating intergranular corrosion sensitivity after welding and bending. This coil is specified for architectural and structural applications where salt spray, marine atmosphere or industrial pollution would cause 304 to pit and stain.
Key Specifications
| Parameter | Specification |
|---|---|
| Standard | ASTM A240 / ASME SA-240 |
| Grade | 316L (UNS S31603) |
| Finish | 2B Finish |
| Thickness | 0.3mm – 3.0mm (cold rolled) |
| Width | 1000mm – 1500mm |
| Coil Weight | 3 – 8 tons |
| Tensile Strength | ≥485 MPa |
| Yield Strength | ≥170 MPa |
| Elongation | ≥40% |
| Hardness | ≤95 HRB |
| Molybdenum | 2.00 – 3.00% |
| Carbon Content | ≤0.030% |
| PREN | 24 – 26 |
Applications
Salt-resistant 316L 2B coil is used in coastal curtain wall backing, marine railing cladding, seaside roofing and fascia, de-icing salt-exposed bridge parapets, tunnel linings, offshore platform accommodation panels and waterfront building trim.
Product Advantages
Molybdenum blocks chloride pitting. 316L withstands salt spray and de-icing chemicals that cause 304 to pit within months. Ultra-low carbon prevents weld decay. No post-weld annealing required, simplifying site fabrication. 2B finish is uniform and coating-ready. Low roughness supports painting, adhesive bonding and laser cutting without surface preparation.
Product Functions
The coil functions as a corrosion-resistant architectural skin and structural substrate, protecting building envelopes from salt-laden air while providing a cleanable, uniform surface for exterior and interior use.
Instructions for Use
Store indoors or under cover on dry wooden pallets. Cut by laser or plasma; deburr edges. Weld with ER316L filler wire; control interpass temperature below 150°C. Post-weld pickling restores passivation on heat-affected zones.
Precautions
Prevent iron contamination from carbon steel tools and racks—this causes false rust on 316L surfaces. Do not use hydrochloric acid cleaners. Avoid prolonged contact with chloride-rich media above 60°C.
Shipping Information
Standard sizes ship 7–10 days after deposit. Custom slit widths add 5–7 days. Ports: Qingdao, Shanghai, Tianjin.
Payment Terms
T/T (30% deposit, balance before shipment) or irrevocable L/C at sight.
Packaging
PVC film and moisture-proof paper wrap, steel strapping, fumigated wooden pallets. Coil eyes protected with end rings. Labels show grade, size, coil number and weight.
After-Sales Policy
Quality claims accepted within 7 working days with batch number and third-party inspection report. Confirmed material or dimensional non-conformity qualifies for replacement or refund. Surface scratches or iron contamination after processing are not covered. Technical support provided for welding, storage and corrosion assessment.
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