AISI 321 Perforated Stainless Steel Sheet

As a trusted global supplier, GNEE possesses extensive experience in exporting AISI 321 perforated stainless steel plates to over 30 countries worldwide, with an annual shipment volume exceeding 500 tons. All raw materials are sourced from certified steel mills, feature a complete furnace batch traceability system, and have been verified through PMI (Positive Material Identification) testing.

Our AISI 321 plates undergo rigorous titanium stabilization treatment to ensure thateven after welding or prolonged exposure to temperatures of 800°Cthey remain completely free from intergranular corrosion. Prior to the perforation process, we conduct 100% PMI testing to verify the titanium content.

Regarding perforation precision, we utilize CNC punching technology to maintain hole diameter tolerances within ±0.05 mm. Simultaneously, our advanced deburring process ensures that the plate edges are smooth, flat, and exhibit minimal burr height. Following perforation, we employ precision roller leveling machines to ensure flatness tolerances remain within 2 mm/m, thereby allowing the plates to be installed or subsequently welded directly without further preparation.

We provide customized unperforated margins based on your specific drawings, ensuring that the plates can be easily welded to equipment frames without compromising the integrity of the hole pattern layout.

 

AISI 321 Perforated Stainless Steel Sheet Specifications

Material Grade	AISI 321 / DIN 1.4541 (Ti-Stabilized)
Thickness Range	0.4 mm – 12.0 mm
Sheet Size	1000x2000, 1220x2440, 1500x3000 mm (Customizable)
Hole Patterns	Round, Square, Slotted, Hexagonal, Decorative
Hole Arrangement	Staggered (60°, 45°) or Straight Row
Hole Diameter (mm)	0.5 mm to 100 mm
Max Open Area	Up to 75%
Post-Processing	Leveling, Deburring, Cutting, Bending, Coating

 

 321 Perforated Stainless Steel Sheet Applications

Aerospace & Aviation: Used in jet engine parts, exhaust manifolds, cabin heaters, and firewalls.
High-Temperature Industrial Processes: Ideal for furnace parts, heat exchangers, and expansion joints.
Chemical & Petrochemical Industry: Used for filter elements and components in volatile, high-heat environments.
Automotive: Used in exhaust systems and heat shields.
General Engineering: Used in ventilation, screening, and machinery components.

 

Lead Time

Standard Thicknesses (0.5mm – 3.0mm) & Regular Perforation Patterns (Round Holes, 60° Staggered): 7 – 10 business days.
Customized Specifications: 5 – 20 business days for special perforation patterns.
Urgent Orders: Gnee maintains an extensive stock of Grade 321 coil material; utilizing high-speed CNC punching machines, we can achieve expedited shipment within 3–5 days.

 

Inspection Items (Quality Inspection - Ensuring 100% Compliance)

Material Composition Testing (PMI Test)
Dimensional & Perforation Accuracy Check
Surface & Burr Inspection
Intergranular Corrosion Test
In accordance with project requirements, an ASTM A262 Practice E report is provided to verify the stability of Grade 321 material following high-temperature welding.

 

Professional Packaging

Surface Protection: The surface of the metal sheets is covered with an 80μm – 100μm PE protective film to prevent scratches during processing and transportation.
Moisture Barrier: Fully wrapped using waterproof Kraft paper and plastic film to prevent salt spray corrosion during sea freight.
Utilizes fumigated wooden pallets (compliant with ISPM-15 standards) or reinforced steel-frame wooden crates.

FAQ 

Q: What are the common perforation patterns available for industrial-grade 321 stainless steel sheets?
A:
Round Holes (60° Staggered): The most common pattern, offering the optimal strength-to-weight ratio.
Round Holes (Straight Row): Suitable for applications requiring specific alignment, though offering relatively lower strength.
Square Holes: Feature a high open area percentage and are frequently used in the fabrication of protective grilles.
Oblong/Slotted Holes: Ideal for the screening or filtration of elongated materials.

 

Q: Is AISI 321 perforated sheet suitable for welding?
A: It is highly suitable. 321 stainless steel possesses excellent weldability. Because this alloy is stabilized with titanium, it does not require post-weld annealing to effectively prevent corrosion in the weld zone. This material is widely utilized in the fabrication of welded components for aerospace and chemical processing equipment.

 

Q: What is the maximum thickness of AISI 321 stainless steel that can be perforated?
A: For heavy-duty industrial screening applications, we are capable of perforating AISI 321 stainless steel sheets up to 12 mm (1/2 inch) in thickness. For sheets exceeding 6 mm in thickness, we typically employ heavy-duty CNC punching presses to ensure the perpendicularity of the hole walls and to minimize hole taper.