Choose carbon steel for suitable dry industrial service, SS304 for many general food-processing duties, and SS316 when the process needs greater resistance to chloride-related corrosion. Galvanised steel is a coated option for compatible, mildly corrosive conditions. The right choice depends on the product, cleaning routine, actual belt temperature and mechanical duty—not on the material name alone.
A honeycomb (flat wire) conveyor belt uses formed flat strips connected by cross rods. These parts, the edge finish and any attached components must suit the same process. This guide compares the four material options and explains what to check before ordering a new belt or upgrading an existing one.
Honeycomb belt construction. Appearance alone does not identify the alloy grade; confirm the strip and cross-rod materials.
The Four Material Options at a Glance
Material
When to consider it
Main selection limit
What to confirm
Carbon steel
Dry handling, component drying and compatible industrial heating.
Rust, scale and product contamination may rule it out in wet or corrosive service.
Steel grade, atmosphere, actual belt temperature and permissible load.
Galvanised steel
Mild atmospheric moisture where a zinc coating is compatible with the process.
Coating wear, heat and chemical attack; product-contact suitability needs review.
Coating type and condition, cleaning chemicals and thermal exposure.
SS304
Many baking, cooling, drying, washing and freezing duties.
Chloride exposure and aggressive cleaning can cause localised corrosion.
Product chemistry, cleaning routine, surface condition and duty rating.
SS316
A candidate for more demanding salt, brine or acidic-product exposure.
Improved corrosion resistance does not mean immunity to seawater, bleach or hot brine.
Concentration, temperature, contact time, drainage and cleaning compatibility.
Read this as a selection guide, not a belt temperature-rating chart. An alloy’s oxidation resistance does not establish the safe working temperature of a loaded, moving belt.
Carbon Steel: A Practical Option for Dry Industrial Duties
Carbon steel can be an economical starting point when moisture and chemical exposure are limited and the product can tolerate contact with the belt. “Carbon steel” covers different grades and conditions; a mild-steel designation alone does not define allowable belt pull or performance in a furnace.
Where it can make sense
Dry component handling: moving suitable manufactured parts where corrosion is controlled and surface cleanliness meets the process requirements.
Industrial drying and curing: handling non-food products, including suitable coated components, after checking the temperature, oven atmosphere and load.
Controlled-atmosphere heating: an application-specific option when the selected grade and belt construction have been reviewed for the process.
Wet washing, condensation, acidic residues or repeated chemical cleaning can make carbon steel a poor choice. For heated service, assess oxidation and scale formation together with loss of strength. There is no universal 400°C limit that can be applied to every carbon-steel honeycomb belt.
For direct food contact, select materials and construction against the actual process and documentation requirements. Do not assume that every carbon-steel application is prohibited, or that changing to stainless steel alone makes an assembly suitable.
Galvanised Steel: Moisture Protection with Coating Limits
Galvanised steel adds a zinc coating to a steel base. It may suit light-duty handling in damp warehouses, packaging operations or sheltered outdoor service where the coating is compatible with the product. Wear at contact points and damage to the coating should be considered alongside atmospheric exposure.
Temperature reference: For hot-dip galvanised coatings, the American Galvanizers Association recommends about 200°C (392°F) as the maximum for long-term continuous exposure. Above this, coating behaviour changes; it is not an instant, universal failure point. This guidance is for the coating, not a certified operating limit for a conveyor belt. See the AGA guidance.
Confirm the actual coating process before applying hot-dip galvanising data. Acids, strong alkalis, cleaning chemicals and abrasive products can affect coating life. For food-contact service, obtain a specific suitability assessment; zinc-coated material should not be treated as universally acceptable or universally prohibited without considering the application.
SS304: A Useful Starting Point for General Food Processing
SS304 is a chromium-nickel austenitic stainless steel. Its protective passive surface helps resist corrosion in many everyday food-processing environments. It is commonly considered for baking, food drying, cooling and suitable washing or freezing duties.
Match the grade to the whole cleaning cycle
Review the food or product residue, wash water and cleaning formulation together. Dilute food acids and suitable alkaline cleaners may be compatible, but concentration, temperature and exposure time matter. A cleaner described as “food-grade” is not automatically compatible with every stainless-steel component.
Baking and food drying: confirm the actual belt temperature, product loading, support arrangement and any residues that remain after the return run.
Cooling and washing: check condensation, water chemistry, drainage and whether residues collect at strip-to-rod contacts.
Freezing: specify the minimum belt temperature and cooling medium. Blast freezing and direct cryogenic exposure are different duties.
Chlorides can trigger pitting or crevice corrosion. This is a reason to compare 304 with 316 under the actual conditions, rather than declaring 304 sufficient whenever the product is unsalted. Cleaning water and chemicals may introduce the more demanding exposure.
SS316: Greater Chloride Resistance, with Defined Limits
The molybdenum addition in SS316 improves resistance to pitting and crevice corrosion compared with SS304 in many chloride-containing environments. It is a useful candidate for salted products, brine exposure and certain acidic processes. Selection still depends on the chemistry and operating conditions.
Process
Why consider SS316
What can change the decision
Seafood handling
Salt residues or brine may make 304 unsuitable.
Direct seawater exposure, warm stagnant liquid and trapped deposits can still attack 316.
Meat marinating and cheese brining
Salt and food acids may create a more demanding environment.
Brine strength, acidity, temperature and time between cleaning cycles.
Dairy and other frequently cleaned lines
Some product and cleaning conditions justify greater corrosion resistance.
The actual cleaning and sanitising formulation; dairy service alone does not require 316.
Chemical-product conveying
Some chemical exposures favour 316 over 304.
The specific chemical mixture and temperature; neither grade suits every acid or chloride solution.
Coastal installations
Airborne salt can increase the corrosion burden.
Salt accumulation, weather exposure, drainage and cleaning frequency.
Bleach and sanitiser exposure need their own review
Changing from 304 to 316 does not make bleach exposure harmless. Hypochlorite can cause localised attack on both grades. Follow an agreed cleaning procedure covering concentration, temperature, contact time and rinsing. BSSA’s hypochlorite guidance explains why exposure control remains necessary.
Assess each sanitiser formulation on its own compatibility data. Do not group quaternary-ammonium products, hypochlorite and all other disinfectants under one material-selection rule.
For continuous seawater contact or hot, concentrated brine, a material beyond 316 may need review. BSSA’s seawater guidance describes the limitations of 316 in these conditions. Also, 316 is not an automatic upgrade for higher furnace temperatures.
Temperature: Specify the Belt Duty, Not Just the Alloy
A catalogue temperature for an alloy may describe oxidation in air under a particular test or service condition. A honeycomb belt must also carry load, articulate around the drive and return, and resist repeated heating and cooling. These requirements can set a lower practical limit.
For ovens and furnaces: provide normal and peak belt temperatures, time at temperature, atmosphere, product load and support spacing. At elevated temperature, creep—gradual deformation under sustained load—can become a design constraint.
For thermal cycling: consider expansion, take-up travel and clearances during heating and cooling, as well as the strength of strip and rod connections.
For freezing: identify the lowest metal temperature and cooling method, including any direct liquid-nitrogen or carbon-dioxide exposure. Review the complete assembly, including drive and support components.
How to use a temperature figure: ask for an agreed operating range for the specific belt construction and load. Figures such as 750°C for 304, 850°C for 316, or −80°C for both should not be treated as universal honeycomb-belt limits. A high-temperature application may need a dedicated heat-resistant alloy, not simply a change from 304 to 316.
A Practical Material-Selection Checklist
Identify the contact conditions. Record the product, whether it directly contacts the belt, and any food-contact or surface-cleanliness requirements. For many general food applications, start by reviewing 304; for suitable dry industrial service, include carbon steel.
Map the wet and chemical exposure. Include wash water, salt, marinades, cleaning and sanitising chemicals. Compare 316 where the chloride burden justifies it. Share product labels or safety/technical data sheets when the chemistry is unclear.
Check heat or cold separately. Provide actual minimum, normal and peak belt temperatures. Do not choose 316 solely because an oven exceeds a generic temperature threshold.
Confirm the belt construction. Identify materials for both flat strips and cross rods, plus the edge and splice arrangement. Check the selected construction against load and drive conditions.
Compare the complete purchase. Review the proposed grade, finish, documentation and mechanical fit alongside price. A higher alloy can address a corrosion problem, but it cannot correct poor drainage, unsuitable cleaning or a mismatched drive.
For a replacement, tell the supplier whether the existing belt gave satisfactory service or failed early. An established specification is a useful starting point; a failed belt provides evidence about what needs to change. Photos of corrosion, wear or distortion are more useful than an unsupported request for the “strongest” grade.
Frequently Asked Questions
Can a carbon-steel honeycomb belt be used outdoors?
Exposure to rain, condensation and humidity can make unprotected carbon steel unsuitable. Galvanised steel may be considered for compatible mild exposure, while stainless steel can be a better candidate for wetter or more corrosive conditions. Coastal salt and cleaning still need review.
Does SS304 automatically mean FDA- or EU-approved?
No. A grade designation is not a food-contact certificate for a finished belt. Suitability also depends on construction, finish, use and cleaning. For example, 21 CFR 117.40 addresses cleanability, corrosion resistance and suitability under intended use. Request the documentation applicable to the supplied belt and destination market.
Can I replace an SS304 belt with SS316?
Often this can be evaluated as a material change, but fit must be checked. Match actual pitch, width, strip and rod dimensions, edge projections, splice and drive geometry. Existing sprocket wear and thermal clearances also matter. Agree the replacement drawing or sample before treating it as interchangeable.
Why is a stainless-steel belt rusting?
Possible causes include an unsuitable grade, trapped chloride-rich residue, unsuitable cleaning, weld or surface condition, and iron contamination from tools or adjacent carbon steel. Check the pattern and location of attack. Changing to 316 will not by itself remove contamination or fix the cleaning procedure.
When should I consider SS316L?
316L is the low-carbon version of 316. It can reduce susceptibility to sensitisation associated with welding and subsequent intergranular corrosion. It is not a general cure for chloride attack or a higher-temperature belt rating. Where welding makes it relevant, confirm the specified standard, material documentation and availability for the proposed construction.
Does changing the material increase belt strength or reduce weight?
Belt mass depends mainly on geometry and material density; it should be quoted for the finished specification. Allowable belt pull depends on grade, material condition, strip and rod dimensions, construction and temperature. Neither 304 nor 316 should be assumed to carry more load than every carbon-steel belt of similar appearance.
Need Help Choosing a Honeycomb Belt Material?
PFM Screen offers carbon steel, galvanised steel, SS304 and SS316 honeycomb belts. Send a belt photo or drawing, the product being conveyed, and your temperature and cleaning conditions. If you do not have the full specification, share what you know so the remaining details can be reviewed.
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