Abstract The study results of the effect exerted by steel grade and heat treatment of grinding balls with a diameter of 100 mm on the hardness, wear and impact resistance, as well as on the tendency to quenching crack embrittlement, are presented. The following effects have been studied: alloying carbon steel (0.6–1.5% of C) with 0.9–5.0% of Cr; 0.6–3.0% of Mn and 0.4–1.7% of Si, and for additional alloying (≤12.0% of Cr) exerted on the structure, surface and bulk hardness; as well as relative wear resistance on the impact resistance of balls in the initial and heat-strengthened condition. By dilatometry means, critical temperatures A c 1 and A c 3 of the onset and completion of the polymorphic transformation α → γ in the studied hypoeutectoid and hypereutectoid steels have been determined in the course of heating. It is recommended to perform the quenching of balls with a diameter ≥100 mm made of hypoeutectoid (0.6–0.75% of C) steels alloyed with 0.9–1.1% of Cr, 0.6–0.8% of Mn and 0.2–0.4% of Si in water or oil. In this case, the quenching temperature should amount to 830–850°C or 860–880°C, respectively, whereas the tempering after quenching should be performed at a temperature of 280–320°C.

中文翻译：

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用于转磨机中铁生料磨削第一阶段的磨球

摘要 介绍了钢种和直径100 mm磨球热处理对硬度、耐磨性和抗冲击性以及淬火裂纹脆化趋势影响的研究结果。研究了以下影响： 将碳钢（C 的 0.6-1.5%）与 0.9-5.0% 的 Cr 合金化；0.6-3.0% Mn 和 0.4-1.7% Si，以及对结构、表面和整体硬度施加的额外合金化（≤12.0% Cr）；以及球在初始和热强化状态下的抗冲击性的相对耐磨性。通过膨胀测量法，确定了所研究的亚共析和过共析钢在加热过程中发生和完成多晶型转变α→γ的临界温度Ac 1 和Ac 3 。建议对直径 ≥ 100 mm 的球进行淬火，该球由亚共析（0.6-0.75% C）钢制成，其中含有 0.9-1.1% Cr、0.6-0.8% Mn 和 0.2-0.4% Si水或油。在这种情况下，淬火温度应分别为 830-850°C 或 860-880°C，而淬火后的回火应在 280-320°C 的温度下进行。