Wear-resistant and impact-resistant excavator tooth steel and heat treatment process thereof

By employing differentiated heat treatment processes following electric arc smelting and forging, the problem of varying hardness and toughness requirements for bucket tooth steel in existing technologies has been solved, achieving a gradient transition in hardness and improving cost-effectiveness.

CN122406111APending Publication Date: 2026-07-17ANHUI UNIVERSITY OF TECHNOLOGY
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
ANHUI UNIVERSITY OF TECHNOLOGY
Filing Date
2026-06-16
Publication Date
2026-07-17

AI Technical Summary

Technical Problem

Existing heat treatment processes for excavator bucket tooth steel are insufficient to meet the differentiated requirements of high hardness at the tooth tip and high toughness at the tooth root on the same bucket tooth. Furthermore, existing gradient performance preparation processes suffer from complex equipment, high costs, and abrupt performance interface issues.

Method used

A wear-resistant and impact-resistant excavator bucket tooth steel and its heat treatment process are adopted. After electric arc smelting and forging, a box furnace is used to form temperature differential heating. Combined with step quenching, self tempering and medium-temperature tempering, ultrafine grain lath martensite at the tooth tip and tempered sorbite at the tooth root are prepared to achieve a gradient transition in hardness.

Benefits of technology

It achieves a tooth tip hardness of 59-62 HRC and a tooth root hardness of 36-41 HRC, with the hardness continuously decreasing from the tooth tip to the tooth root without abrupt interface, making it suitable for mass production and low cost.

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Abstract

本发明公开了一种耐磨耐冲击挖掘机斗齿钢及其热处理工艺，属于挖掘机零部件制造技术领域。本发明的斗齿钢，其化学成分按质量百分比计为：C 0.30‑0.35%，Si 1.50‑1.80%，Mn 2.10‑2.50%，Cr 1.30‑1.60%，Mo 0.45‑0.55%，V 0.18‑0.22%，Al 0.60‑0.80%，P ≤0.020%，S ≤0.020%，余量为Fe和不可避免杂质。该斗齿钢的热处理工艺将斗齿竖直放置于箱式炉中进行差异化加热，使齿尖区域析出含钼碳化物而齿根区域钼固溶于基体，再经分步淬火、自回火、中温回火及差异化淬火处理，实现了使齿尖硬度达59‑62 HRC，齿根硬度为36‑41 HRC，沿齿尖至齿根方向硬度连续递减，从而获得齿尖高耐磨、齿根高韧性的梯度性能。
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