 |
140-100
YASSIAN or Your's
Reasons for the selection of materials for making bucket teeth
In construction machinery, the material selection of bucket teeth directly affects their wear resistance, impact resistance and service life, and a comprehensive decision should be made in combination with the characteristics of the working conditions.
I. Core Material Types and Their Applicable Scenarios
High manganese steel (such as ZGMn13 series)
Characteristics : The initial hardness is relatively low (HB200), but under impact load, the surface rapidly hardens to above HB500, forming a "self-reinforcing armor" effect. The austenitic structure endows it with extremely high toughness and strong crack resistance.
Applicable scenarios : medium and low impact earthwork operations, sand and gravel excavation, etc. It has a high cost performance, but the welding repair requires special welding rods and preheating processes.
Forging alloy steel (such as 40CrMnMo)
Characteristics : The closed die forging process achieves a density of 7.8g/cm³, with significant grain refinement. The surface hardness is HRC52-55, the core maintains HRC38-42 toughness, and the fatigue life is twice that of castings.
Applicable scenarios : rock mining in mines, high-intensity impact conditions (such as iron ore, basalt). Representative product: Caterpillar D11 mining bucket teeth.
Casting low alloy steel
Composition examples : C 0.38%, Cr 0.91%, Mn 0.83%, Si 0.92%. Heat treatment is required to optimize the uniformity of the microstructure.
Limitation : Casting porosity/sand hole defects lead to a decline in mechanical properties. It is only recommended for ordinary earthwork operations.
Ii. Core Basis for material Selection
Wear resistance priority
Rock conditions : Forged alloy steel must be selected, with tungsten carbide coating (HV≥1200) for further anti-peeling.
Wear-dominated scenario : high manganese steel relies on the work-hardened layer to resist abrasive wear.
Shock resistance requirements
The forged part is formed by three-way compressive stress and can withstand a digging force of ≥20 tons (the transverse gear pin structure is more reliable).
Under severe impact, the hardened layer thickness of high manganese steel can reach 5-10mm, avoiding brittle fracture.
Corrosive environment fit
Nickel/chromium alloy steels (such as Cr-Ni-Mo series) resist acidic soil or salt spray corrosion, extending their service life by more than 30%.
Cost-efficiency balance
Casting low alloy steel has the lowest cost, but its service life is only 50% of that of forged parts, making it suitable for short-term projects.
The unit price of forgings is 1.5 times that of castings, but their lifespan is doubled, making them more economical for long-term use.
Iii. Correlation between Process and Performance
Process: tensile strength: defect rate: applicable material:
Closed die forging ≥980 MPa porosity ≤0.1% alloy structural steel
Cast + water toughening treatment 650-800 MPa, sand holes ≥3% high manganese steel/low alloy steel
Operation prompt : When replacing the bucket teeth, the model of the tooth seat should be matched (the vertical installation type is easy to disassemble but has weak load-bearing capacity, while the horizontal installation type has stronger anti-digging force). The mine suggests checking the wear of the tooth tips every shift and replacing them in time to avoid damaging the tooth base.
Reasons for the selection of materials for making bucket teeth
In construction machinery, the material selection of bucket teeth directly affects their wear resistance, impact resistance and service life, and a comprehensive decision should be made in combination with the characteristics of the working conditions.
I. Core Material Types and Their Applicable Scenarios
High manganese steel (such as ZGMn13 series)
Characteristics : The initial hardness is relatively low (HB200), but under impact load, the surface rapidly hardens to above HB500, forming a "self-reinforcing armor" effect. The austenitic structure endows it with extremely high toughness and strong crack resistance.
Applicable scenarios : medium and low impact earthwork operations, sand and gravel excavation, etc. It has a high cost performance, but the welding repair requires special welding rods and preheating processes.
Forging alloy steel (such as 40CrMnMo)
Characteristics : The closed die forging process achieves a density of 7.8g/cm³, with significant grain refinement. The surface hardness is HRC52-55, the core maintains HRC38-42 toughness, and the fatigue life is twice that of castings.
Applicable scenarios : rock mining in mines, high-intensity impact conditions (such as iron ore, basalt). Representative product: Caterpillar D11 mining bucket teeth.
Casting low alloy steel
Composition examples : C 0.38%, Cr 0.91%, Mn 0.83%, Si 0.92%. Heat treatment is required to optimize the uniformity of the microstructure.
Limitation : Casting porosity/sand hole defects lead to a decline in mechanical properties. It is only recommended for ordinary earthwork operations.
Ii. Core Basis for material Selection
Wear resistance priority
Rock conditions : Forged alloy steel must be selected, with tungsten carbide coating (HV≥1200) for further anti-peeling.
Wear-dominated scenario : high manganese steel relies on the work-hardened layer to resist abrasive wear.
Shock resistance requirements
The forged part is formed by three-way compressive stress and can withstand a digging force of ≥20 tons (the transverse gear pin structure is more reliable).
Under severe impact, the hardened layer thickness of high manganese steel can reach 5-10mm, avoiding brittle fracture.
Corrosive environment fit
Nickel/chromium alloy steels (such as Cr-Ni-Mo series) resist acidic soil or salt spray corrosion, extending their service life by more than 30%.
Cost-efficiency balance
Casting low alloy steel has the lowest cost, but its service life is only 50% of that of forged parts, making it suitable for short-term projects.
The unit price of forgings is 1.5 times that of castings, but their lifespan is doubled, making them more economical for long-term use.
Iii. Correlation between Process and Performance
Process: tensile strength: defect rate: applicable material:
Closed die forging ≥980 MPa porosity ≤0.1% alloy structural steel
Cast + water toughening treatment 650-800 MPa, sand holes ≥3% high manganese steel/low alloy steel
Operation prompt : When replacing the bucket teeth, the model of the tooth seat should be matched (the vertical installation type is easy to disassemble but has weak load-bearing capacity, while the horizontal installation type has stronger anti-digging force). The mine suggests checking the wear of the tooth tips every shift and replacing them in time to avoid damaging the tooth base.
