APPLICATION SOLUTION
Necklaces
Chains for fashionable necklaces
Annotated Chain Configuration
Key dimensional and structural features of our heavy-duty conveyor chain assembly, designed for maximum load-bearing capacity and extended service life.
Usage Constraints
Understanding the environmental and operational limits is essential for selecting the correct chain specification. Below are the key constraints for this application scenario.
Temperature Range
Continuous operation verified from sub-zero cold storage environments to high-temperature furnace discharge applications. For temperatures exceeding 250°C, consult our engineering team for specialised alloy recommendations.
Maximum Working Load
Rated working load based on a 5:1 safety factor. Peak shock loads up to 650 kN permissible for short-duration events. Load distribution across multiple strands must be verified during system design.
Chemical Exposure
Stainless steel variants resistant to mildly acidic and alkaline environments. For concentrated acid, caustic soda, or chlorine-rich atmospheres, specify 316L stainless with appropriate surface passivation.
Wear Conditions
Chains operating in abrasive media (sand, cement, ore) require hardened rollers and bushings. Sliding wear applications (drag conveyors) benefit from case-hardened link plates and precision-matched components.
Moisture & Humidity
Outdoor and washdown environments require corrosion-resistant materials and surface treatments. Stainless steel or zinc-nickel plated carbon steel options available with salt-spray ratings exceeding 500 hours.
Duty Cycle
Designed for non-stop production environments. Lubrication intervals and inspection schedules are calibrated for 8,000-hour continuous operation between major service events. Auto-lubrication systems recommended for inaccessible locations.
Recommended Chain Types
Based on the application parameters, our engineering team recommends the following chain types with suitability ratings for your specific operating conditions.
Materials & Surface Treatments
Selecting the right material and surface finish combination directly impacts chain service life, maintenance frequency, and total cost of ownership.
Alloy Steel (40Cr / 42CrMo)
RecommendedAdvantages
- High tensile strength (1,000-1,200 MPa)
- Excellent fatigue resistance after heat treatment
- Good wear resistance when case-hardened
- Cost-effective for high-volume production
- Wide availability of certified raw material
Limitations
- Requires surface coating for corrosion protection
- Susceptible to hydrogen embrittlement during plating
- Not suitable for food-grade or hygienic applications
Available Finishes
Stainless Steel 304
AlternativeAdvantages
- Excellent corrosion resistance in atmospheric conditions
- Good performance in food processing environments
- No additional coating required
- Wide operating temperature range
- Good weldability for custom attachments
Limitations
- Lower tensile strength than alloy steel (~520 MPa)
- Susceptible to galling under high contact pressure
- Higher material cost than carbon/alloy steel
- Limited hardness after heat treatment
Available Finishes
Stainless Steel 316L
SpecialtyAdvantages
- Superior corrosion resistance with molybdenum content
- Resistant to chloride pitting and crevice corrosion
- Suitable for marine and chemical processing environments
- Low carbon content improves weld corrosion resistance
- Excellent performance in acidic conditions
Limitations
- Highest material cost among common chain steels
- Lower strength than heat-treated alloy steel
- Longer lead time for raw material procurement
- Work hardening during forming requires process control
Available Finishes
Manganese Steel (Hadfield)
SpecialtyAdvantages
- Exceptional work-hardening under impact loading
- Surface hardness increases from 200 HB to 550+ HB in service
- Superior impact and abrasion resistance
- Ideal for crusher and heavy impact conveyor applications
- Tough core remains ductile for shock absorption
Limitations
- Difficult to machine — requires specialised tooling
- Poor performance under pure sliding wear without impact
- Higher density increases chain weight
- Limited suppliers of certified Hadfield steel
Available Finishes
Performance Requirements
Key mechanical and physical performance parameters that your chain must meet for this application. All values are verified through our quality testing programme.
Ultimate tensile strength tested per ISO 15654. Safety factor of 5:1 applied to derive working load limit.
Measured elongation at fracture point. Values exceeding 1.5% indicate material ductility issues or inadequate heat treatment.
Rotating bending fatigue life at 10% failure probability. Validated at 50% of rated working load under ISO 15654 conditions.
Neutral salt spray test (ASTM B117) duration before first red rust. Zinc-nickel plated variants achieve 500+ hours without base metal corrosion.
Case hardness measured at the pin surface. Core hardness maintained at 35–42 HRC for toughness. Depth of case: 0.8–1.2 mm.
Maximum permissible chain elongation after 2,000 hours of accelerated wear testing under load. Exceeding this value triggers chain replacement.
Testing Protocol
Every production batch undergoes a structured testing programme aligned with international standards and your specific acceptance criteria.
Dimensional Inspection
ISO 286-1, ISO 2768-mK
100% dimensional inspection on critical parameters: pitch, inner width, pin diameter, plate thickness, and overall width. Sample size: 20 links per 1,000 links produced. Digital callipers and micrometers calibrated to ISO 17025.
Tensile Testing
ISO 15654, ASTM E8
Destructive tensile testing on representative samples from each heat treatment batch. Computer-controlled 100 kN universal testing machine with digital data acquisition. Minimum 3 samples per batch.
Hardness Testing
ISO 6508-1, ASTM E18
Rockwell hardness testing on pins, bushings, and link plates. Surface hardness and case depth measured on metallographic cross-sections. Micro-Vickers hardness traverse for case depth verification.
Corrosion Resistance
ASTM B117, ISO 9227
Neutral salt spray testing on plated and coated components. Continuous exposure in a controlled 5% NaCl atmosphere at 35°C. Inspection intervals at 24, 72, 168, 336, and 500 hours. Acceptance: no base metal corrosion at specified duration.
Fatigue Testing
ISO 15654, in-house protocol AT-FT-001
Rotating bending fatigue test on assembled chain segments. Testing at 50% and 75% of rated working load. Run-out criterion: 10 million cycles without failure. Data recorded for S-N curve generation.
Wear Testing
In-house protocol AT-WT-003
Accelerated wear testing under controlled load and speed conditions. Chain elongation measured at 500-hour intervals. Wear debris analysis for particle size distribution. Lubricant condition monitoring throughout the test.
Sampling Checklist
Structured sampling and pre-production verification process to ensure your chain meets all specifications before mass production begins.
Timeline:6–8 Weeks
Specification Review & Engineering
- ☐Technical drawing review completedEngineering team reviews all technical drawings and confirms dimensional feasibility against our manufacturing capabilities before proceeding.
- ☐Feasibility report issuedA detailed feasibility report covering material selection, tooling requirements, and production timeline is issued within 5 working days.
- ☐Material certification obtainedMill certificates and material test reports for the specified steel grade are obtained and verified against purchase specifications.
- ☐Quality plan documentedA comprehensive quality plan defining inspection points, sampling frequency, and acceptance criteria is documented and shared with the client.
Tooling & Initial Samples
- ☐Tooling fabricated and verifiedPrecision tooling is fabricated and verified against the approved drawings with dimensional measurement reports.
- ☐Initial samples produced (10-20 links)Initial samples are produced using the new tooling to validate link geometry, pitch accuracy, and surface finish quality.
- ☐Customer feedback on initial samplesSamples are shipped to the customer for evaluation with a full dimensional report and sample comparison documentation.
Revised Samples & Testing
- ☐Revised samples produced (50-100 links)Revised samples incorporating customer feedback are produced in larger quantities for comprehensive evaluation.
- ☐Mechanical testing completedTensile, hardness, and dimensional testing are completed with full test reports issued to the customer.
- ☐Surface finish verificationSurface finish and coating thickness are verified using calibrated instruments against the agreed specification.
- ☐Customer approval of revised samplesRevised samples and test reports are submitted for customer approval before proceeding to golden sample production.
Golden Sample & Production Release
- ☐Golden sample produced and approvedThe final golden sample is produced on production tooling and approved by both parties as the reference standard.
- ☐Golden sample retained by both partiesThe approved golden sample is sealed and retained by both the manufacturer and customer for future comparison.
- ☐Production schedule confirmedMass production schedule, quantities, and delivery milestones are confirmed and documented in the order agreement.
- ☐Packaging specification approvedPackaging materials, labeling, and export documentation requirements are reviewed and approved before production begins.