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ATF Crusher Parts
Slurry Pump Impellers | Cr27 600+ BHN | ATF

Slurry Pump Parts

Slurry Pump Impellers | Cr27 600+ BHN | ATF

Cr27 high-chrome (600+ BHN) rubber ceramic impellers. Matched to pump model slurry density & particle size. Abrasion & erosion resistant.

Impellers Volutes High-Chrome

Key Specifications

High-Chrome Grades
A05 (Cr27), A07 (Cr27Mo), A49 Hyperchrome
Chrome Hardness
600–700+ BHN (grade-dependent)
Rubber Grades
R55 (55 Shore A), R26 (40 Shore A), R08 Neoprene
Balance Standard
ISO 1940 G2.5 dynamic balance
Pump Compatibility
Warman AH, Metso HM/MD, KSB GIW, ITT Goulds
Size Range
1.5/1 through 20/18 (Warman frame equivalent)
Max Temperature
70 C (rubber), 120 C (chrome)
Certification
ISO 9001 manufacturing, full MTR supplied

Key Features of ATF Slurry Pump Impellers

High-Chrome White Iron (Cr27)

Premium A532 Class III chrome iron with 27% chromium content delivers 600+ BHN hardness. Industry standard for coarse abrasive slurries in mill discharge and cyclone feed applications.

Natural Rubber Lined

Soft natural rubber (40-60 Shore A) provides superior erosion resistance for fine particle slurries below 150 microns. Ideal for flotation circuit and tailings applications.

Ceramic Insert Technology

Silicon carbide or alumina ceramic inserts in high-wear vane areas extend service life 2-3x in ultra-abrasive applications. Available for select impeller sizes.

Precision Hydraulic Profiles

Vane geometry reverse-engineered from OEM designs using 3D scanning. Maintains original pump curve characteristics and efficiency after replacement.

Dynamic Balance

All impellers dynamically balanced to ISO 1940 G2.5 standard. Reduces vibration, bearing loads, and mechanical seal stress for extended component life.

Wear-Resistant Coatings

Optional tungsten carbide HVOF coating or ceramic plasma spray on suction inlet areas where cavitation-erosion accelerates wear.

Impellers

Slurry Pump Impellers: The Heart of Centrifugal Slurry Pumps

Impellers are the rotating component at the centre of every centrifugal slurry pump, and their design, material, and condition are the single most significant factors determining pump head, flow rate, efficiency, and maintenance intervals. As the impeller spins at speeds of 400–1,200 RPM depending on pump frame size, vanes accelerate slurry outward through centrifugal force, converting mechanical energy into hydraulic energy that drives the slurry through the piping system. In abrasive slurry service typical of mining and mineral processing, impeller wear is the primary performance-limiting factor. ATF manufactures aftermarket impellers from A05 high-chrome white iron (Cr27, 600–650 BHN per ASTM A532 Class III), A07 Cr27Mo with added molybdenum for corrosion resistance (650–700 BHN), A49 hyperchrome (700+ BHN) for extreme abrasion, and natural rubber (R55 at 55 Shore A, R26 at 40 Shore A) for fine-particle and corrosive applications. Every impeller is dynamically balanced to ISO 1940 G2.5 to minimise vibration, bearing loads, and mechanical seal stress.

Mining and mineral processing applications subject impellers to extreme erosion-corrosion from abrasive solids—including silica, alumina, magnetite, and other hard minerals at concentrations of 10–50% solids by weight—combined with chemically aggressive carrier fluids ranging from pH 2 to pH 12. Material selection must balance erosion resistance against corrosion resistance, with the optimal choice depending on slurry pH, particle size distribution (D85 above or below 150 microns is the primary decision threshold), solids concentration, and impeller tip speed. ATF manufactures aftermarket impellers in high-chrome alloys, natural rubber, neoprene, polyurethane, and ceramic composite configurations to match any application requirement. All impeller hydraulic profiles are reverse-engineered from OEM designs using 3D scanning and CMM verification to ensure replacement impellers maintain original pump curve characteristics, efficiency ratings, and NPSH performance.

35+ Years Experience
OEM-Fit Guarantee
ISO 9001 Certified
Slurry pump impeller in high-chrome white iron manufactured by ATF

A05 high-chrome white iron impeller dynamically balanced to ISO 1940 G2.5 for mining slurry pump applications

OEM Compatibility

ATF manufactures aftermarket impellers for all major slurry pump brands used in mining and mineral processing. Parts are engineered to OEM specifications with guaranteed dimensional fit and hydraulic performance.

Warman / Weir Minerals

  • AH Series (1.5/1, 2/1.5, 3/2, 4/3, 6/4, 8/6, 10/8, 12/10, 14/12, 16/14, 18/16, 20/18)
  • AHP Series (High Pressure)
  • L Series (Light Duty)
  • M Series (Medium Duty)
  • HH Series (Heavy Duty High Head)

Metso (Sala/Thomas/Orion)

  • HM Series
  • HR Series
  • HS Series
  • MD Series Mill Discharge
  • VF Series Froth

KSB GIW

  • LSA Series
  • LCC Series
  • LCV Series
  • MDX Mill Duty
  • TBC Tailings/Booster

ITT Goulds

  • XHD Extra Heavy Duty
  • SRL Slurry
  • 5500 Series
  • CV 3196 Chemical/Slurry

Flowserve

  • Durco Mark III Slurry
  • IDP Slurry

Schurco Slurry

  • S Series
  • H Series
  • SC Series

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Impeller Material Options

Impeller material selection is driven by slurry characteristics including particle size, solids concentration, pH, and temperature. High-chrome alloys dominate coarse particle applications while elastomers excel with fine particles and corrosive slurries.

A05 High-Chrome (Cr27)

Hardness:600-650 BHN
Application:Mill discharge, cyclone feed, coarse tailings >150 microns
Notes:Industry standard for mining. Best erosion resistance for coarse particles

A07 High-Chrome (Cr27Mo)

Hardness:650-700 BHN
Application:Highly abrasive slurries with moderate corrosion
Notes:Molybdenum addition improves corrosion resistance

A49 Hyperchrome

Hardness:700+ BHN
Application:Ultra-abrasive mineral sands, heavy media circuits
Notes:Maximum hardness for extreme erosion applications

R55 Natural Rubber

Hardness:55 Shore A
Application:Fine slurries <150 microns, flotation, tailings transfer
Notes:Superior fine particle erosion resistance, max temp 70C

R08 Neoprene

Hardness:65 Shore A
Application:Oily slurries, moderate chemical exposure
Notes:Better oil and chemical resistance than natural rubber

U01 Polyurethane

Hardness:90 Shore A
Application:Fine abrasive slurries, high-velocity applications
Notes:Excellent cut resistance, limited temperature range

Note: Material codes follow industry-standard Warman/Weir nomenclature. Consult ATF engineering for application-specific recommendations.

FAQ

Impellers FAQs

Find answers to common questions about impellers materials, selection, maintenance, and ordering. Can't find what you're looking for?

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How do I know when to replace slurry pump impellers?
Monitor pump performance metrics including discharge pressure, flow rate, power draw, and vibration levels. A 10–15% reduction in head or flow at constant speed typically indicates significant impeller wear affecting hydraulic efficiency. Physical inspection during maintenance should check vane leading edge thickness, suction and pressure shroud wear, suction eye diameter enlargement, and vane tip erosion patterns. For high-chrome impellers, look for carbide washout (a roughened surface indicating the chrome-carbide matrix is eroding) and cracking at vane roots. For rubber impellers, check for delamination from the steel core, chunking of rubber from vane tips, and swelling from chemical attack. Replace when wear exceeds OEM dimensional limits, when efficiency loss translates into uneconomical power consumption, or when vibration increases beyond acceptable limits indicating imbalance from uneven wear. ATF recommends establishing replacement thresholds based on pump curve deviation and tracking wear rates to predict optimal replacement timing.
Should I use rubber or chrome impellers?
Particle size distribution is the primary selection criterion between rubber and chrome impeller materials. For slurries with a D85 below 150 microns (fine particles), rubber impellers—particularly R55 natural rubber at 55 Shore A—typically provide 1.5 to 3 times longer wear life than high-chrome due to rubber's resilient response to fine particle erosion, where particles bounce off the elastic surface rather than cutting it. For coarser particles above 150 microns, A05 or A07 high-chrome alloys (600–700 BHN) are preferred because the hard chrome-carbide microstructure resists the gouging and cutting action of larger particles that would rapidly destroy rubber. Slurry chemistry is the secondary consideration: rubber performs significantly better in acidic conditions (pH below 5) where chrome suffers corrosion-accelerated erosion, while chrome handles neutral to alkaline slurries (pH 7–12) effectively. Temperature is also critical—rubber is limited to approximately 70 degrees C, while chrome can operate to 120 degrees C. ATF engineers evaluate your complete operating conditions to recommend the optimal material.
What causes premature impeller wear?
The most common cause of premature impeller wear is operating the pump away from its Best Efficiency Point (BEP). At flows below 80% of BEP, internal recirculation increases dramatically, creating high-velocity vortices at the impeller inlet and between vanes that accelerate localised erosion. At flows above 110% of BEP, flow separation on vane surfaces and increased relative velocities cause excessive wear on vane tips and pressure sides. Insufficient NPSH margin (less than 1.5 times NPSHR) causes cavitation—the formation and violent collapse of vapour bubbles—that produces severe pitting erosion on the impeller suction shroud and vane leading edges. Other common causes include excessive solids concentration exceeding the pump design limit, oversized particles that impact vane leading edges at high energy, and incorrect material selection for the slurry conditions. ATF recommends operating pumps within 80–110% of BEP flow and maintaining a minimum NPSH margin of 1.5 times NPSHR to maximise impeller service life.
Can I mix impeller and liner materials?
Yes, mixed material configurations are common in mining slurry pump applications and can optimise total wet-end wear cost when conditions at different component positions favour different materials. A frequently used combination pairs a high-chrome impeller (A05, 600–650 BHN) with rubber volute and frame plate liners (R55, 55 Shore A)—this works well because the impeller operates at high tip speeds where chrome's hardness resists gouging from coarse particles, while the volute and frame plate see lower velocities where rubber's resilience provides excellent fine-particle erosion resistance. Another effective configuration uses a chrome impeller with a rubber throatbush in applications where the suction inlet conditions favour rubber. The key principle is matching material properties to the specific wear mechanism each component experiences: impact angle, particle velocity, particle size, and chemical environment. ATF engineering evaluates each pump position independently and recommends the optimal material combination for minimum total cost of ownership.

Related Slurry Pump Parts

Volute Liners

Casing liners that form the volute chamber, directing flow from impeller to discharge.

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Throatbush Liners

Suction side wear components protecting the pump inlet and frame plate.

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Frame Plates & Expellers

Back liner plates and dynamic sealing components for shaft protection.

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Technical content reviewed by ATF Engineering Team | Metallurgical specifications verified against ASTM/ISO standards

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