Castings for Washing, Conveying & Fluid Engineering

Washing, pulping, dewatering, and conveying equipment works in the harshest mixed environments: alkaline slurries at pH 8–12, acidic and wet chemical media, abrasive fibers, sand and fillers — corrosion and wear attacking the same part at the same time. Ordinary 304 stainless wears out too fast; ordinary cast iron corrodes too fast. Huasuma casts the parts that survive both: high-consistency pulper rotors, impellers, screw shafts and inlet chambers for the paper and wood industry, plus corrosion-resistant hammers, rake teeth, and forged connecting rods for chemical and process equipment.

Materials are matched to the duty: Cr26/Cr28 high-chrome cast iron for abrasive-corrosive wet-end service, AISI 420 martensitic stainless for hardness with toughness and corrosion resistance, S12108 (309S-type) heat- and corrosion-resistant stainless for hot chemical duty, and duplex stainless for oxidizing bleach environments. Lost-foam, sand, and investment casting processes are selected per part geometry, with dimensions built to your equipment.

Pulper Rotors for High-Consistency Systems

The high-consistency rotor is the working heart of the pulper: spinning in 12–18% consistency stock, it must defiber recycled paper efficiently while alkaline slurry and abrasive contaminants — sand, filler, ink particles — grind at every surface. AISI 420 stainless rotors (HRC 48–52 quenched and tempered, ≥20 J/cm² impact toughness) balance hardness, toughness, and corrosion resistance for medium-wear duty and deliver the best cost-performance. Cr26 high-chrome iron rotors (HRC 56–62) outlast stainless in extreme-wear service with heavily contaminated recycled furnish — typically 2–3× the wear life of 304 in pulping conditions. Rotors from 800–1,500 mm diameter and 150–500 kg are cast to your pulper’s tank volume.

Pulper Impellers, Screw Shafts & Inlet Chambers

Pulper impellers in 304 stainless or Cr26 high-chrome iron (HRC 56–62) serve pulpers from 10 to 50 m³, resisting fiber wrapping and abrasive erosion. Dewatering screw shafts combine a Cr26/Cr28 high-chrome wear surface (HRC 58–64) with a 420 stainless shaft body — wear resistance where the screw meets the stock, structural strength along the shaft — for high-pressure dewatering and thickening duty. Inlet chambers in 420 stainless (HRC 48–52) withstand continuous slurry scouring at the pulper feed. All are dimensioned to mainstream pulper and thickener models, with custom sizes on request.

Corrosion-Resistant Hammers for Fertilizer & Chemical Crushers

Crushing wet, acidic fertilizer and chemical feed destroys ordinary hammers twice over: impact wear plus corrosive spalling of the hammer face. AISI 420 martensitic stainless hammers solve both — HRC 48–52 after quenching with ≥20 J/cm² impact toughness after tempering, and a surface that does not rust or delaminate in wet, acidic duty. Compared with conventional high-manganese hammers, 420 hammers hold their face far longer in fertilizer service, extending continuous run time between change-outs. Shell-mold precision casting delivers consistent geometry piece after piece.

Rake Teeth & Guard Plates in Heat- and Corrosion-Resistant Stainless

S12108 stainless (309S-type: Cr 22–24%, Ni 12–15%) rake teeth and guard plates serve classification and dewatering equipment in hot, corrosive chemical environments: continuous service up to 800 °C with strong oxidation and sulfidation resistance. In acid and alkali duty they outlast high-manganese steel equivalents 2–3×, because the section no longer erodes from corrosion between abrasive losses. Mechanical properties in solution-treated condition: ≥450 MPa tensile, ≥245 MPa yield, ≥20% elongation, ≥40 J/cm² impact toughness at HB 180–210.

Forged Connecting Rods for Presses, Crushers & Process Drives

The connecting rod converts rotation into reciprocation — and lives under cyclic tension-compression plus bending at extreme fatigue stress. Huasuma forges rods in 40Cr and 42CrMo4 alloy steel (45# and QT400-18 ductile iron options for low-speed, light-duty service) by closed-die forging, so the metal grain flow follows the rod body — fatigue strength no casting can match. Quench-and-temper to HRC 28–35 balances strength and toughness: 42CrMo4 rods deliver ≥1,080 MPa tensile and ≥930 MPa yield with ≥63 J room-temperature impact. Precision machining holds center distance to ±0.10 mm, big-end bore to ±0.02 mm, small-end bore to ±0.01 mm, with bearing surfaces at Ra 0.4–1.6 μm — no eccentric wear, no early failure. Rod weights from 50 to 3,000 kg cover mechanical presses, crusher drive trains, and chemical agitator and reactor drives.

Material Selection for Wet & Corrosive Duty

• Cr26 / Cr28 high-chrome iron — HRC 56–64; the wear-plus-corrosion answer for alkaline pulping and dewatering; 2–3× the life of 304 in pulper service.
• AISI 420 martensitic stainless — HRC 48–52, ≥20 J/cm² toughness; rotors, inlet chambers, fertilizer hammers where impact meets corrosion.
• 304 stainless — baseline corrosion resistance for light-wear wet-end positions.
• S12108 (309S-type) stainless — continuous service to 800 °C; hot, corrosive classification and dewatering duty.
• Duplex stainless — oxidizing bleach-plant environments (ClO₂ / H₂O₂) where 304 falls short.
• 40Cr / 42CrMo4 forged steel — fatigue-critical drive components, quenched and tempered to HRC 28–35.

Every melt is verified before pouring — furnace-front temperature and sample chemistry — and finished parts pass hardness testing, metallographic verification, and dimensional checks. Material certificates and inspection reports ship with each order. Huasuma runs an ISO 9001 quality system with 30 years of casting export experience worldwide.

Why Huasuma for Washing & Conveying Wear Parts

Wet-end and chemical-service parts fail from two directions at once — our material selection is built for exactly that. Tell us your equipment model, media chemistry, and current wear life, and our engineers will recommend a grade and stand behind it. Send drawings or a sample for a 24-hour quotation.

Explore our metal casting capabilities and steel forging services, or contact our specialists.