321 2BA Finish Stainless Steel Sheet

321 Stainless Steel Sheet (2BA Finish) is a titanium-stabilized austenitic stainless steel flat product engineered for applications requiring resistance to intergranular corrosion after exposure to temperatures in the chromium carbide precipitation range (427C to 816C).

The 2BA finish (bright annealed, skin-passed) provides a smooth, reflective, and scale-free surface with controlled surface roughness (Ra <= 0.4 um), minimizing surface preparation requirements prior to fabrication, welding, or secondary forming operations. Supplied in standard or custom slit dimensions per ASTM A240 and ASME SA240 specifications.

Titanium Stabilization (Ti >= 5 x C): Prevents chromium carbide precipitation during high-temperature exposure or welding, eliminating the risk of intergranular corrosion.

Controlled 2BA Surface Finish: Bright annealed under a controlled protective atmosphere, yielding a clean, smooth, and semi-reflective surface with low initial surface defect rates.

High-Temperature Mechanical Retention: Maintains structural strength and oxidation resistance in continuous service up to 870C.

Formability: Exhibits excellent ductility and drawing properties typical of austenitic grades, suitable for roll forming, bending, and deep drawing.

To support diverse engineering requirements, 321 sheet is supplied in the following metallurgical conditions:

Condition A (Annealed): Standard mill-annealed delivery state optimized for general corrosion resistance and formability.

Stabilized Heat Treatment: Solution-annealed at 950C to 1120C followed by rapid cooling to ensure complete carbide dissolution and optimal titanium distribution.

Alternative/Companion Grades:

Grade 304/304L: For standard atmospheric environments without elevated temperature exposure.

Grade 316/316L: For enhanced resistance to pitting and chloride-bearing environments.

Grade 321H: Higher carbon variant (0.04% to 0.10%) engineered for enhanced creep resistance at temperatures above 500C.

We supply 321 2BA stainless steel sheets in both standard mill sizes and customized dimensions tailored to specific fabrication schedules:

Thickness Tolerances: Manufactured within strict tolerances per EN ISO 9445 or ASTM A480 (e.g., +/- 0.03 mm for 1.0 mm thickness).

Length & Width Customization: Laser cutting and precision slitting services available down to width tolerances of +/- 0.1 mm.

Edge Condition: Mill Edge or Slit Edge (deburred on request).

Flatness Control: Roller-leveled sheets with maximum deviation from flatness <= 1.5 mm/m to prevent distortion during automatic laser cutting.

Every production lot undergoes rigorous multi-stage metallurgical and dimensional verification:

Chemical Composition Verification: Spectrometric analysis (PMI / OES) conducted per heat to verify titanium-to-carbon ratio and nickel/chromium proportions.

Mechanical Testing: Tensile, bend, and hardness testing performed in accordance with ASTM E8/E8M.

Surface Integrity Inspection:

• Automated and manual visual inspection under 1000-lux lighting to detect micro-scratches, pits, roller marks, or oxidation scale.
• Surface roughness (Ra) verification using contact profilometers.

Traceability: Full Mill Test Reports (MTR) provided in accordance with EN 10204 3.1, traceable via heat numbers stamped or inkjet-printed on protective interleave paper.

To protect the delicate 2BA bright annealed finish from transit damage and moisture-induced staining:

Interleave Protection: PVC protective film (laser-safe or standard polyethylene) applied on the finish side, or paper interleaving between individual sheets.

Packaging Structure: Moisture-resistant kraft paper wrapping, sealed with waterproof outer plastic, secured over heavy-duty wooden skids/pallets with steel strapping.

Export Compliance: ISPM 15 heat-treated wooden pallets suitable for international ocean and air freight.

Loading Capacity: Secure container loading configurations up to 25 metric tons per 20GP container with blocking and bracing to prevent shifting.

To receive a formal quotation for 321 2BA Finish Stainless Steel Sheet, please provide the following technical details to our engineering sales team:

Thickness, Width, and Length (or required cut parts)

Total Quantity (Metric Tons or Number of Sheets)

Surface Protection Requirement (Standard PVC, Laser Film, or Paper Interleaved)

Destination Port / Delivery Location

Required Standards or Additional Third-Party Inspection (TPI) specifications

Engineering Sales Note: Need custom slit widths or specific temper requirements? Our metallurgical team responds within 12 hours with complete MTR samples and custom pricing.

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