Bucket Tips 144-1358 Replacement Parts

The bucket teeth are made of alloy structural steel 40CrMnMo

The Application of 40CrMnMo Alloy Structural Steel in the Fabrication of Bucket Teeth

40CrMnMo is a high-strength medium-carbon quenched and tempered manganese steel alloy structural steel. Through precise chemical composition (carbon C:0.37% - 0.45%, Silicon Si:0.17% - 0.37%, Manganese Mn:0.90% - 1.20%, Chromium Cr:0.90% - 1.20%, Molybdenum Mo:0.20% - 0.30%), It has achieved a high load-bearing capacity with tensile strength ≥980MPa and yield strength ≥785MPa. Its high hardenability (with an oil quenching critical diameter of 60-100mm) and excellent wear resistance make it an ideal material for heavy-duty engineering machinery components such as bucket teeth.

The key advantage of using 40CrMnMo in the manufacturing of bucket teeth lies in its fatigue resistance and low notch sensitivity, which can effectively cope with impact wear in harsh working conditions such as mines. The heat treatment process involves oil quenching at 850℃ followed by tempering at 600℃, forming a tempered sorbite structure. This ensures a gradient hardness distribution of HRC52-55 on the surface and HRC38-42 in the core, taking into account both wear resistance and toughness.

When manufacturing bucket teeth, the tip density of the teeth should be compacted to 7.8g/cm³ through a closed compound die forging process (hydraulic press tonnage ≥800 tons), and combined with shot peening and tungsten carbide coating treatment (HV≥1200), the corrosion resistance and anti-peeling performance should be further enhanced. The service life was finally verified through destructive tests (such as a 3-ton drop hammer impact).