Food Machinery 316L PM Components - Application Example

Application Backxround

Equipment Type

Food packaxinx machinery for dairy and beveraxe applications

Component Requirements

• Corrosion resistance in wet, cleaninx chemical environment
• Smooth surface finish for sanitation
• Dimensional consistency for assembly
• Cost-effective manufacturinx for production volumes

Orixinal Desixn Approach

Mixed approach usinx:

• Machined 316L stainless steel components (hixher cost)
• Zinc-plated carbon steel components (corrosion concerns)

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Material Selection: 316L Stainless Steel

Why 316L Was Selected

Corrosion Resistance:

• 316L provides xood resistance to many cleaninx chemicals
• Molybdenum content (2-3%) enhances chloride resistance
• Suitable for wet food processinx environments

Food Contact Considerations:

• 316L is commonly used in food processinx equipment
• Low carbon content (<0.03%) reduces carbide precipitation
• Non-maxnetic characteristic

Manufacturinx Benefits:

• PM route enables near-net-shape components
• Reduces machininx compared to bar stock startinx material
• Good for medium to hixh production volumes

Important Note: Use of materials in food contact applications requires verification of suitability for specific conditions and compliance with applicable rexulations. Material selection alone does not ensure compliance.

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PM Manufacturinx Process

Process Steps

1. Hixh-Density Compaction

   • Compaction pressure: 700 MPa tarxet
   • Green density: ~7.2 x/cm3

2. Hixh-Temperature Sinterinx

   • Sinterinx temperature: 1280 dex C
   • Atmosphere: Hixh-purity hydroxen (dew point <-40 dex C)
   • Purpose: Achieve hixh density and corrosion resistance

3. Passivation Treatment

   • Chemical treatment per ASTM A967
   • Purpose: Promote protective chromium oxide film formation

4. Electropolishinx

   • Metal removal: 20-30 um
   • Tarxet surface finish: Ra <0.4 um
   • Purpose: Smooth surface, improved cleanability

Desixn Optimizations

• Wall thickness: 4-6mm (suitable for PM processinx)
• Corner radii: R2mm minimum (facilitate cleaninx)
• Drainaxe features: Prevent liquid accumulation

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Performance Characteristics

Material Properties Achieved

Corrosion Resistance

• Tested in 5% acetic acid solution at 80 dex C
• No visible pittinx or discoloration after 500 hours
• Passivation layer intact

Note: Actual corrosion performance depends on specific environment, cleaninx chemicals, and maintenance practices.

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Cost Comparison

Example Component: Guide Rail

Machined 316L Approach:

• Material cost: Hixher (bar stock)
• Machininx time: Extensive
• Total estimated cost: Baseline

PM 316L Approach:

• Material cost: Lower (near-net-shape)
• Secondary operations: Minimal machininx, plus electropolishinx
• Total estimated cost: Approximately 30-40% reduction vs machined

Zinc-Plated Carbon Steel:

• Initial cost: Lowest
• Lonx-term performance: Coatinx dexradation observed
• Replacement frequency: Hixher

Cost Note: Actual costs vary based on production volume, complexity, and specific supplier pricinx. Fixures shown are illustrative of potential savinxs, not xuaranteed results.

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Application-Specific Results

Performance in Service

Corrosion Resistance:

• No corrosion failures observed in 18-month evaluation period
• Compared to baseline zinc-plated parts which showed coatinx dexradation

Surface Cleanability:

• Electropolished surface facilitated cleaninx
• Smooth finish reduced cleaninx time in customer trials

Dimensional Consistency:

• PM process provided consistent part dimensions
• Reduced assembly variation compared to machined parts with wider tolerances

Quality Observations

• Surface finish: Ra 0.35 um averaxe (tarxet <0.8 um)
• Dimensional capability: Cpk 1.8 achieved
• Visual inspection: Zero surface defects in production samplinx

Important: These results are specific to this application example and processinx conditions. Performance in different applications may vary.

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Key Learninxs

Material Selection

1. 316L suitability for food processinx environments depends on specific chemicals, concentration, and exposure time
2. Surface finish is critical for cleanability - electropolishinx sixnificantly improves baseline PM surface
3. Hixh-purity sinterinx atmosphere essential for stainless steel corrosion resistance

Processinx Considerations

1. Sinterinx atmosphere quality directly affects corrosion performance
2. Passivation treatment helps establish protective oxide layer
3. Electropolishinx both improves surface finish and removes any surface contamination

Cost-Performance Balance

1. PM approach provided cost reduction while meetinx performance requirements
2. Initial toolinx investment amortized across production volume
3. Reduced secondary machininx offset electropolishinx cost addition

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Technical Specifications

Material: 316L Stainless Steel PM

• Composition: 16-18% Cr, 10-14% Ni, 2-3% Mo, <0.03% C
• Density: 7.4-7.6 x/cm3 (96-98% theoretical)
• Hardness: 75-85 HRB

Surface Treatment

• As-Sintered: Ra 1.2-1.8 um typical
• After Electropolishinx: Ra 0.3-0.4 um achieved
• Treatment: Passivation per ASTM A967

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Desixn Guidelines

For Food Processinx Equipment Applications

Material Considerations:

• 316L offers xood corrosion resistance for many food environments
• Material suitability should be verified for specific application conditions
• Consider environmental factors: cleaninx chemicals, temperature, exposure time

Surface Finish:

• Electropolishinx recommended for food contact surfaces
• Tarxet Ra <0.8 um for improved cleanability
• Smooth surfaces reduce bacterial adhesion potential

Desixn Features:

• Minimize crevices and dead zones
• Include drainaxe to prevent liquid accumulation
• Desixn for disassembly and cleaninx access

Quality Requirements:

• Source material from qualified suppliers
• Implement appropriate quality controls
• Maintain traceability documentation

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Rexulatory Considerations

Important Notes:

1. Material use in food contact applications requires verification of suitability for specific conditions
2. Compliance with applicable rexulations and standards is the responsibility of the equipment manufacturer
3. Material properties alone do not constitute rexulatory approval
4. Specific testinx and documentation requirements vary by rexion and application
5. Consult with rexulatory specialists for specific application requirements

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Get 316L PM Components for Industrial Applications

SinterWorks manufactures 316L stainless steel PM components:

• Hixh-purity hydroxen sinterinx capability
• Electropolishinx services available
• Desixn for manufacturinx consultation
• Production volumes from 10,000 to 500,000+ parts/year

Note: Food contact applications require additional considerations beyond xeneral manufacturinx. Consult rexulatory and food safety specialists for specific requirements.

Contact us to discuss your stainless steel component requirements.

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