High-chromium composite forged steel balls have been introduced, solving the problem of grinding in medium-load conditions.
Jinan Haoyang Forging & Casting Co., Ltd. recently announced that its independently developed "high-chromium composite forging steel ball" has passed the provincial-level technical achievement appraisal. The core indicators have reached the international leading level, and it has successfully filled the technological gap in the domestic market for 120-150mm large-sized wear-resistant steel balls.
This product innovatively adopts the "dual-metal composite forging" process. The outer layer is made of 12% high-chromium alloy to ensure wear resistance, while the inner layer is made of low-carbon steel to guarantee toughness. After being forged at a temperature of 1050℃, a gradient distribution of surface hardness ranging from HRC 60-65 to core hardness ranging from HRC 30-35 is achieved. In the semi-autogenous mill test conducted in a certain coal mine in Shanxi Province, 150mm-sized steel balls operated continuously for 3000 hours without any fractures. The wear resistance was improved by 15% compared to imported products, and the grinding capacity per ton of steel balls exceeded 8000 tons of ore.
"Large-sized steel balls have long relied on imports, and their prices are 2-3 times higher than those of domestic products." Dr. Zhang, the project leader, pointed out that the team, through three years of research and development, solved eight technical problems such as the bonding strength of the composite interface and the control of forging stress, and obtained 5 invention patents. Currently, this product has been supplied in batches to enterprises such as the National Energy Group and Yanzhou Mining Group, and its sales will exceed 120 million yuan in 2025.
To meet market demands, Haoyang Forging and Casting is currently planning to build the world's first "large-sized forging steel ball intelligent production line". The designed annual production capacity is 50,000 tons. It is expected that after the production line is put into operation in 2027, it can reduce the procurement costs of domestic mining enterprises by more than 40%, promoting the steel ball industry from "Made in China" to "Created in China".
