مسبوكات صناعية دقيقة
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Mining & Crushers
Jaw crusher frame / pitman body casting
Cast Steel ASTM A27 Gr70-40 / A148 Gr80-50; Heavy section low-alloy steel
Structural frame – fatigue in cyclic crushing load. Heavy section (wall thickness >50mm common). Casting soundness class specified per applicable standard.
Mining & Crushers
Ball mill liner / lifter bar
27%Cr Hi-Chrome white iron (dominant for hard ore / high ball charge); Mn14Cr2 (impact-moderate); Cr15MoNi martensitic
Weight: 5–200 kg. Hi-chrome white iron: eutectic carbide volume 30–45%. Hardness 600–700 HBN. Life measured in tonnes ground per tonne of liner. OEM or end-user defines material grade.
Mining & Crushers
Blow bar (impact crusher rotor bar)
Hadfield Mn steel Mn14Cr2 (high impact, softer material); 27%Cr Hi-Chrome White Iron (high abrasion, harder rock); Martensitic white iron Cr15MoNi (balanced)
Most common replacement part in impact crushers – high wear rate. Blow bar weight: 10–200 kg. Cr content drives hardness: 27%Cr = ~650 HBN. Match material to feed: Mn for soft high-impact feed; Hi-Cr for hard abrasive rock. Balance weight within set of bars critical.
Mining & Crushers
Bowl liner (concave) – outer crushing surface (stationary)
Hadfield Mn steel ASTM A128 Gr B-3 / Mn14Cr2 / Mn18Cr2; 27% Cr white iron
Must be matched profile to mantle – gap uniformity critical for product gradation. Common material: Mn14Cr2 for most quarry applications. Cr content improves resistance to polishing wear.
Mining & Crushers
Cone / mantle liner (inner crushing surface – rotating cone)
Hadfield Mn steel ASTM A128 Gr B-3 (Mn14Cr2); Mn18Cr2 for medium-hard rock; 27%Cr white iron for highly abrasive low-impact
Profile accuracy critical – crushing gap geometry determines product size. Mn steel work-hardens under compressive impact. Mn18Cr2 suitable for harder rock (granite, basalt). White iron: abrasive low-impact ores (silica sand, limestone).
Mining & Crushers
Eccentric body casting (cone crusher eccentric shaft housing)
Cast Steel ASTM A27 Gr70-40 / A148 Gr80-50; some in ductile iron GJS-500-7
Eccentric bore geometry: OD and ID must be accurately concentric and positioned. Drives gyrating motion of cone. Bronze bushing press-fit into bore – bore tolerance H7.
Mining & Crushers
Feeder trough / pan liner (apron / grizzly feeder)
Hadfield Mn steel Mn13Cr2 / Mn14Cr2; 27%Cr white iron (fine abrasive feed)
Grizzly feeder fingers: Mn steel (tough, work-hardens). Apron pan liners: material matched to feed type. Bolt-on replaceable design.
Mining & Crushers
Hammer / beater (hammer mill)
Hadfield Mn steel ASTM A128 Gr B-3 (high impact soft material); 27%Cr white iron (abrasive); Martensitic Cr15
Smaller than blow bars. Pivot pin hole must be accurate for pin clearance and balance. Hammers run in sets – matched weight important for rotor balance.
Mining & Crushers
Impactor plate / apron liner (impact crusher apron / back plate)
Hadfield Mn steel Mn13Cr2 / Mn14Cr2; 27%Cr white iron; Martensitic Cr15MoNi
Receives impact from fly rock after blow bars. Material selection: same logic as blow bars. Geometry designed to direct material flow and maintain crushing action.
Mining & Crushers
Jaw crusher toggle block / toggle seat (cast)
Cast steel ASTM A27 Gr70-40 or A148 Gr80-50
Toggle transmits crushing force – high compressive load. Cast steel (not Mn) – high compressive strength required not wear resistance.
Mining & Crushers
Jaw plate (fixed jaw / swing jaw) – primary and secondary
Hadfield Manganese Steel (Mn13Cr2): ASTM A128 Gr B-3 (Mn13Cr2); Mn14Cr2; Mn18Cr2 (high abrasion) ; Mn22 (impact-dominant)
ASTM A128 Gr B-3 or Gr C. Water quench heat treatment CRITICAL – non-quenched Mn steel is brittle. Work-hardening surface in service: 200–550 HV from ~175 HBW as-cast. Jaw profile: straight, corrugated, or wave per crusher model. Weight: 50–2000 kg each depending on crusher size.
Mining & Crushers
Main frame / spider casting (cone crusher structural body)
Cast Steel A148 Gr80-50 / Gr105-85; heavy-section low alloy steel
One of the largest wear-exposed structural castings. Spider arms carry top-mounted arm. Wall thickness often 60–120mm. Solidification simulation recommended. Weld repair WPS pre-qualified.
Mining & Crushers
Rotor disc / rotor body (impact crusher rotor)
Cast Steel ASTM A148 Gr105-85 / Gr120-95 or low alloy (structural – not wear material)
Structural casting – fatigue loading from cyclic impact. Blow bars attached – rotor must be balanced after blow bar installation. Bore: H6/k5 tolerance for shaft.
Mining & Crushers
SAG mill shell liner / head liner
Mn steel Mn18Cr2 (high impact); 27%Cr white iron (high abrasion); Martensitic Cr15MoNi; Rubber-metal composite (some designs)
SAG mill liners: large single castings (500–1500 kg). Profile: lifter bars + shell plates. Mn steel dominates for large SAG (impact energy high). White iron for ball mills (lower impact, high abrasion). OEM (FLSmidth, Metso Outotec, Thyssenkrupp) drawing controlled.
Mining & Crushers
Side plates / cheek plates (jaw crusher side liners)
Hadfield Mn steel ASTM A128 Gr B-2 / Gr C; Chrome-Moly White Iron (Cr26 or Cr28) for lower impact / high abrasion
White iron option: extremely hard (wear-resistant) but brittle – suitable only where impact energy is low. Mn steel: tough and work-hardening – better for high impact. Selection depends on feed material hardness and fragmentation.
Mining & Crushers
Trunnion liner / feed chute liner (mill trunnion wear protection)
Cr-Mo white iron; Mn steel; sometimes high-Cr cast iron
Trunnion liner protects structural trunnion from ore abrasion. Dimensional accuracy for fit critical. Often replaceable segments.
Mining & Crushers
Vibrating screen side plate / bearing housing casting
Cast Steel ASTM A27 Gr70-40; Ductile Iron GJS-500-7
High cycle vibration fatigue environment. Bearing bore concentricity and roundness critical – H7 tolerance. Weld repair at stress risers: pre-qualified WPS required.
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