Press Welded Steel Grating (Stainless Steel)

1. Product Overview

Stainless Press Welded Steel Grating is manufactured using advanced high-voltage resistance welding technology. Unlike manual welding, our automated process fuses austenitic stainless steel cross bars into bearing bars under immense pressure and heat, creating a seamless, monolithic joint. Leveraging our facility’s four high-capacity pressure welding lines, we produce premium-grade panels with exceptional consistency. This automated capability allows us to manufacture custom-sized panels directly, minimizing material waste and ensuring a cost-effective solution for hygiene-critical environments like food processing and pharmaceuticals.

2. Technical Parameters

Feature	Specification Details (Stainless Steel)	Standards & Notes
Material Grade	SS304, SS304L, SS316, SS316L, SS321	Austenitic series for maximum passivity
Bearing Bar Type	Plain / Serrated	Serrated recommended for oily/wet zones
Bearing Bar Depth	20mm – 60mm	Calculated based on structural deflection
Bearing Bar Thickness	3mm – 6mm	5mm common for sanitary platforms
Cross Bar Size	6mm,8mm,10mm	Resistance-welded to eliminate crevices
Mesh Pitch (Center)	20mm – 100mm (Range Available)	Custom pitches to minimize off-cut waste
Panel Dimensions	Width ≤ 1000mm, Length ≤ 7000mm	Customized to fit container & galvanizing limits
Surface Treatment	Pickling & Passivation, Polishing	Restores chromium oxide layer; sanitary finish
Manufacturing Std	ASTM A380, ANSI/NAAMM, ISO 9001	Compliance with hygienic global codes

 

Common mesh hole spacing：

 

Bearing bar	Cross Bar
15,08				38,1	50,8	76,2	101,6
17,15				38,1	50,8	76,2	101,6
20,77		24,0		38,1	50,8	76,2	101,6*
23,69		24,0		38,1	50,8	76,2	101,6*
25,00						76,2	101,6
30,15				38,1	50,8	76,2	101,6
33,00			31,75
34,30	19,25	24,0		38,1	50,8	76,2	101,6
41,45		24,0		38,1	50,8	76,2	101,6
45,23				38,1	50,8	76,2	101,6
51,45				38,1	50,8	76,2	101,6
60,30		24,0		38,1	50,8	76,2	101,6
68,60		24,0		38,1	50,8	76,2	101,6

 

bearing bar profile：

bearing bar 2mm	bearing bar 3mm	bearing bar 4mm	bearing bar 5mm
20/2	20/3	20/4	20/5
25/2	25/3	25/4	25/5
30/2	30/3	30/4	30/5
35/2	35/3	35/4	35/5
40/2	40/3	40/4	40/5
45/2	45/3	45/4	45/5
50/2	50/3	50/4	50/5
	60/3	60/4	60/5
	70/3	70/4	70/5
	80/3	80/4	80/5

 

 

2. Engineering Notes:

Engineering Notes: Stainless steel design must prioritize the material’s specific deflection characteristics, especially in Chemical Processing or Offshore platforms where safety under load is critical. Because our high-voltage resistance welding creates a localized fusion with a minimal heat-affected zone, the grating retains its inherent structural properties as-welded. For Sterile or Food-Grade environments, we recommend the Polishing finish to provide a surface that resists the adhesion of organic residues. For industrial-only applications where cost-efficiency is paramount, the grating is typically supplied without post-weld chemical treatment, relying on the high chromium content of the base alloy for localized corrosion resistance.

 

 

3. Product Advantages

1.Homogeneous Resistance-Welded Joints: Our high-voltage welding process creates a molecular bond at every intersection. Unlike press-locked gratings which have mechanical gaps, our fused joints are completely crevice-free. This eliminates “dirt traps,” preventing the accumulation of bacteria and contaminants, which is the primary requirement for food-grade and sterile facility certifications.

2.Production Flexibility & Material Efficiency: With four automated welding lines, we are not limited to standard sheet sizes. We manufacture panels to your project’s exact dimensions. This “Made-to-Measure” approach significantly reduces the cost of stainless steel waste and eliminates the need for aggressive on-site cutting that could compromise the passive layer.

3.Superior Chemical Passivity: Fabricated from premium 304/316L alloys, the resistance-welded structure maintains full electrical continuity and structural rigidity. Combined with professional pickling and passivation, the grating forms a robust self-healing oxide barrier that resists chloride pitting in marine and chemical environments.

4.High-Strength Sanitary Rigidity: The fused intersections provide exceptional lateral stability without using bolts or rivets. This ensures the grating remains rattle-free and structurally sound even under the vibration of heavy processing machinery, while the open mesh allows for unrestricted steam cleaning and airflow.

4. Applications & Engineering Scenarios

1.Food & Beverage Processing: Essential for dairies, breweries, and meat plants where floors undergo daily high-pressure chemical sanitation and must remain bacteria-free.

2.Pharmaceutical Cleanrooms: Deployed in sterile zones requiring non-shedding, non-magnetic surfaces with a high-quality polished finish.

3.Marine & Offshore Platforms: Engineered for oil rigs and coastal infrastructure to withstand harsh salt-spray corrosion while providing safe, non-slip access.

5. Quality Control & Performance

1.Weld Penetration & Fusion Audit: We perform cross-sectional tests to verify that the resistance welding has achieved full depth penetration, ensuring the joint strength is equal to the parent metal.

2.Passivation Integrity Testing (Ferroxyl Test): We utilize the Ferroxyl Test to detect any free iron particles on the surface. This ensures the passivation process is complete and prevents “tea staining” or flash rust after installation.

3.Surface Roughness (Ra) Inspection: For polished orders, we use surface roughness testers to confirm the finish meets the specific sanitary standards required for your medical or food industry application.

 

6. Factory Customization & Engineering Services

1.Precision CNC Notching: We provide expert factory-cut geometric shaping for pipes and columns. Crucially, all cutting is performed before the final pickling/polishing stage to ensure 100% corrosion protection on the cut edges.

2.High-Profile Kick-plates: We offer factory-welded 100mm-150mm High-Profile Kick-plates (Toe-boards) to prevent object falls, fully welded and passivated to meet strict safety codes.

3.Panel Numbering & CAD Layouts: Our engineering team supplies detailed Shop Drawings. Every panel is marked with a Unique ID Number corresponding to the layout, ensuring a fast, error-free installation sequence.

4.Custom Alloy Optimization: We analyze your site’s chemical exposure to recommend the most cost-effective alloy (e.g., 304 vs. 316L) and mesh configuration.

7. FAQ

Q: Why is resistance welding better than manual welding for stainless steel?

A: Resistance welding is faster and more consistent. It minimizes the “Heat Affected Zone” (HAZ) and eliminates weld splatter, resulting in a cleaner, more hygienic joint that is easier to passivate.

Q: Can you produce custom-sized stainless panels to save costs?

A: Yes. Our automated lines allow us to produce the exact width and length you need. This eliminates the high cost of paying for stainless steel scrap that would otherwise be cut off from standard sheets.

Q: How do I prevent contamination during installation?

A: You must use stainless steel tools and fasteners. Never allow carbon steel or iron dust to contact the grating, as this will embed particles and cause rust spots.

Q: Is the polished finish just for looks?

A: No. Polishing smoothens the microscopic surface, making it much harder for bacteria, salt, and dirt to adhere. It is a functional requirement for high-hygiene areas.

 

In summary, Stainless Press Welded Grating delivers unmatched sanitary performance, vibration resistance, and durability for food processing, pharmaceutical cleanrooms, offshore platforms, and marine facilities. Its precise automated joints, material efficiency, and customizable finishes ensure long-term hygiene, safety, and cost-effective reliability in demanding corrosive settings.