Description
Carbon Steel & Heavy-Duty Ladder Sprockets — Maximum Load Capacity for Mining, Quarrying & Bulk Material Conveyors
Ever-power Australia Driven Sprocket Co., Ltd. manufactures carbon steel and cast iron ladder sprockets engineered for the most demanding heavy-load conveyor applications in Australian industry. Three material tiers — standard C45 carbon steel, induction-hardened tooth variants and spheroidal graphite (SG) cast iron — address escalating wear, impact and abrasive-dust challenges encountered in iron-ore mining, coal handling, cement batching, quarry aggregate processing and timber milling.
We supply mining maintenance contractors, bulk material handling OEMs, quarry operators and heavy-industrial fabricators across every Australian state and territory. All heavy-duty sprockets are manufactured under our ISO 9001 : 2015 quality system with full material traceability and hardness verification.
1. Technical Specifications
| Parameter | C45 Standard | Induction Hardened | Cast Iron HD |
|---|---|---|---|
| Material | C45 / 1045 (0.42-0.50% C) | C45 base + surface hardened | GGG60 / GGG70 SG Iron |
| Core Hardness | HRC 20-30 | HRC 20-30 (core) | HRC 25-35 |
| Tooth Hardness | HRC 20-30 | HRC 50-58 (case 1.5-3.0 mm) | HRC 25-35 |
| Tensile Strength | 580-650 MPa | 580-650 MPa (core) | 600-800 MPa |
| Max Continuous Temp | 400°C | 350°C | 350°C |
| Tooth Count Range | 8 – 120 teeth | 8 – 120 teeth | 10 – 95 teeth |
| Pitch Range | 9.525 – 76.2 mm | 9.525 – 76.2 mm | 12.7 – 76.2 mm |
| Bore Range | 15 – 200 mm | 15 – 200 mm | 25 – 250 mm |
| Hub Style | Type A / B / C / Split | Type A / B / C / Split | Type B / C / Split / Weld-on |
| Surface Treatment | Zinc plate / Black oxide | Zinc plate / Black oxide | Shot blast / Primer coat |
2. Product Features
◆ Induction-Hardened Tooth Flanks
Medium-frequency induction coils selectively heat tooth surfaces to 850-950°C then water-quench, achieving HRC 50-58 case hardness over 1.5-3.0 mm depth while the hub retains ductile core toughness. Dramatically extends re-pitch intervals in abrasive-dust environments.
◆ SG Cast Iron Shock Resistance
Spheroidal graphite iron (GGG60/GGG70) absorbs impact energy from lump ore and ROM material without catastrophic fracture. Tensile strength exceeding 600 MPa with superior fatigue resistance versus grey cast iron or standard steel.
◆ H7 Bore Tolerance
All bores machined to H7 tolerance for interference fit on hardened shafts. Keyways to AS 2062 / DIN 6885 specification. Split-hub options for rapid field replacement without full shaft disassembly.
◆ 2-3x Wear Life
Field data from Pilbara iron-ore and Hunter Valley coal operations confirms induction-hardened ladder sprockets deliver 2-3x the service life of untreated C45 alternatives in continuous abrasive-dust conveyor duty.
◆ Cost-Effective C45 Baseline
For moderate-duty general industrial conveying, warehousing sortation and grain handling, standard C45 normalised or Q&T steel provides the optimal strength-to-cost ratio.
◆ Weld-On & Split-Hub Options
Cast iron heavy-duty sprockets available with weld-on hubs for permanent installation on apron feeder shafts, or split hubs for maintenance-friendly replacement on operating conveyors.
3. Compatibility Information
Chain Standards: ANSI 40 through ANSI 240 (single, double, triple strand), ISO 606 / DIN 8187, heavy-series engineering steel chains, bush chains and apron-feeder link chains.
Shaft Diameter Range: 15 mm to 250 mm. Keyways machined to AS 2062 / DIN 6885. Taper-lock bush, QD bush and interference-fit bore options.
Coupling Compatibility: Compatible with fluid couplings, torque limiters and heavy-duty chain couplings used in mining conveyor drive trains.
4. Selection Guide
C45 Standard: General industrial conveying, warehousing, grain handling and moderate-duty packaging where ambient humidity is controlled and abrasive dust is minimal. Most cost-effective option.
Induction Hardened: High-cycle conveyors in abrasive environments — timber milling, cement batching, mineral sands, coal handling. The hardened case (HRC 50-58) resists abrasive flank wear while the ductile core absorbs shock loading.
Cast Iron HD: Shock-loaded bulk material conveyors — ROM ore apron feeders, primary crusher discharge, coal bunker reclaim conveyors and aggregate screening plants. Choose GGG70 for the highest tensile strength and fatigue resistance.
5. Material & Manufacturing Process
C45 / 1045: Mill-certified medium-carbon steel bar stock, normalised or quenched-and-tempered to HRC 20-30. CNC machined, zinc plated or black oxide finished.
Induction Hardened: C45 base sprocket machined to finished dimensions, then tooth flanks selectively heated by medium-frequency induction coils (850-950°C) and water-quenched. Case depth 1.5-3.0 mm verified by micro-hardness traverse. Surface finished with zinc plate or black oxide.
SG Cast Iron: GGG60/GGG70 castings poured in bonded-sand moulds, heat-treated (normalised + tempered), then CNC machined to finished dimensions. All castings ultrasonically inspected for internal defects. Shot-blasted and primer-coated for transport corrosion protection.
6. Application Scenarios
⚒Iron Ore & Coal Mining
Induction-hardened and SG cast iron sprockets drive apron feeders, AFC conveyors and ROM bin discharge systems processing 3,000-5,000 tph of abrasive bulk material in Pilbara and Hunter Valley operations.
🏗Cement & Concrete Batching
Induction-hardened C45 sprockets resist fine cement and silica dust abrasion on clinker conveyors, bucket elevators and batch plant feed systems.
⚙Quarry & Aggregate
SG cast iron heavy-duty sprockets tolerate shock loading from lump stone and gravel on vibrating feeder discharge and screening plant transfer conveyors.
🌾Agricultural Grain Handling
Zinc-plated C45 sprockets on grain auger discharge, elevator leg drives and chaff-spreading conveyors. Balanced wear life and cost-effectiveness for seasonal agricultural machinery.
7. Customer Testimonials
★★★★★ — Pilbara Iron Ore Contractor, Australia
GGG70 cast iron sprockets with induction-hardened teeth on our primary crusher apron feeder. Tooth wear rate reduced by 60%, replacement interval extended from 12 weeks to 26 weeks. Significant maintenance cost saving.
★★★★★ — Coal Handling Plant, Hunter Valley, Australia
Induction-hardened C45 sprockets on our overland conveyor. 18 months in service with minimal flank wear. Good bore accuracy and keyway fit.
★★★★ — Cement Manufacturer, Indonesia
C45 standard grade for our clinker cooler conveyor. Price-competitive and adequate wear life for our moderate-abrasion application. Reordered for a second kiln line.
★★★★★ — Quarry Operator, South Africa
SG iron heavy-duty sprockets handling 500 mm lump stone on our primary screen discharge. No tooth fractures after 10 months of continuous operation.
★★★★★ — Grain Handler, Western Australia
Zinc-plated C45 sprockets on our grain elevator legs. Good corrosion protection through the wet season. Competitive pricing for our fleet of 14 elevators.
8. Frequently Asked Questions
9. Recommended Accessories
🔗Heavy-Duty Roller Chains
ANSI heavy-series and ISO 606 roller chains in single, double and triple strand. Heat-treated pins and bushings matched to hardened sprocket teeth.
⚙Taper-Lock & QD Bushings
Split taper-lock and QD bush adaptors in carbon steel and stainless steel for quick sprocket installation and removal.
⚪Heavy-Duty Pillow Block Bearings
SN-series and SAF-series split plummer block bearing housings for heavy-shaft conveyor drives. Grease-lubricated, sealed for dusty environments.
10. Installation Guide
Step 1: Inspect shaft for scoring, corrosion or dimensional wear. Shaft must be within tolerance for the specified bore fit (H7 interference or slip).
Step 2: For interference-fit bores, heat sprocket uniformly to 120-150°C in an induction heater or oil bath. Slide onto shaft and allow to cool naturally. Do not quench.
Step 3: Insert key, verify seating. For split-hub designs, torque bolts to specification in a cross pattern.
Step 4: Align with mating sprocket using straight edge. Maximum angular misalignment: 0.5 degrees. Maximum offset: 1.0 mm.
Step 5: Install chain, tension to 2-4% sag. For apron feeder chains, follow OEM tensioning procedure. Re-check after 48 hours of operation.
11. Maintenance & Inspection
Lubrication: Apply EP-grade chain lubricant every 250-500 operating hours depending on dust exposure. In sealed environments, extend to 1000 hours.
Wear Measurement: Use a sprocket wear gauge or vernier caliper to measure tooth thickness at pitch circle monthly. Replace when tooth width reduction exceeds 2.0 mm or chain seating depth exceeds 3.0 mm beyond nominal for heavy-duty applications.
Visual Inspection: Check for tooth tip chipping, flank scoring, hub cracking and keyway deformation quarterly. Any cracking warrants immediate replacement.
Replacement Interval: C45 standard: 3,000-6,000 hours. Induction hardened: 8,000-15,000 hours. SG cast iron HD: 6,000-12,000 hours (varies with abrasive loading).
12. Certifications & Standards
Manufactured to ISO 606, ANSI B29.1, DIN 8187/8188 and AS 2050 dimensional standards. Material verified against ASTM A29 (carbon steel) and EN 1563 (SG cast iron). ISO 9001 : 2015 certified facility, SGS/TUV audited. Full mill certificates, hardness test reports and Certificates of Conformance supplied.
13. Why Choose Ever-power
We are Ever-power Australia Driven Sprocket Co., Ltd. — specialists in heavy-duty ladder sprockets with 20+ years of supply to Australian mining contractors, quarry operators and bulk material handling OEMs. We own the full production chain: CNC machining, induction hardening, heat treatment and CMM inspection — all under one roof. No outsourced steps. Over 15,000 SKUs delivered. 98.4% on-time dispatch. 200+ active Australian accounts.
14. Get a Quote Today
Provide your chain pitch, tooth count, bore size, shaft details and operating environment. We will recommend the optimal material tier and deliver a formal quotation within one business day.
