75CR1 - Breaking the Wall of Technological Monopoly

Rizhao Steel debuts 75CR1 high-carbon steel, ending monopoly and boosting industry

For the industrial chain, the elimination of technological monopolies has provided more material options for downstream enterprises and promoted the material upgrading of equipment such as industrial saw blades.

The 75CR1 features a precise composition of "high carbon and high chromium", and possesses three core advantages:

High strength

High hardness

Excellent wear resistance

It can withstand the high-intensity work in mining operations, ensuring stability and service life during use.

According to the research director of Rizhao Steel, this steel type is mainly suitable for large-scale cutting equipment used in heavy-load conditions, and plays a crucial role in ensuring the continuity of industrial production and reducing equipment maintenance costs.

The development of 75CR1 was not an easy task. The strict requirements for component control accuracy made it a core challenge:

The difficulty in component regulation: The carbon (C) content needs to be precisely controlled within 0.70-0.80%, the chromium (Cr) content should remain stable at 0.30-0.40%, and harmful elements such as phosphorus (P) and sulfur (S) must be strictly limited to below 0.03%. Any minor deviation could lead to the failure of product performance.

High requirements for process collaboration: From the precise adjustment of components in the steelmaking process, to the control of uniformity of the structure during the continuous casting process, and to the performance matching in the rolling stage, all these steps need to be carried out in real-time throughout the entire process.

To overcome these challenges, the cross-departmental technical team of Rizhao Iron and Steel, with the concept of "full-process collaborative innovation", utilized key technical process parameters such as "the process control scheme mentioned in a method for smelting 75GR1 tool steel with ferrovanadium-containing molten iron" to achieve a dual breakthrough in precise composition and stable structure.

These patented technologies not only ensure the stable production of 75CR1, but also demonstrate the enterprise's "systematic operation" capabilities in the research and development of high-end steel.

For the industry, the short process advantage of the ESP production line (which is more efficient and energy-saving compared to traditional methods) provides a new path for the large-scale production of high-end carbon steel at a lower cost.

This successful trial production will have an immeasurable impact on the industry and enterprises. It represents a leap from "following" to "leading", and has multiple implications for the industry:

A relevant official from Rizhao Steel stated that in the future, based on this foundation, they will continue to explore and develop high-carbon steel technology, and through the output of technology, upgrade the production capacity. They will continue to contribute to the development of China's steel industry.

The successful trial production of 75Cr1 high-carbon steel by Rizhao Iron and Steel marks a significant milestone for technological innovation, green transformation, and industrial chain collaboration in China's steel industry. It not only optimizes the competitive landscape of the industry, promotes process upgrading, but also achieves value enhancement throughout the "steel - equipment - application" entire chain by supporting the upgrading of downstream equipment and strengthening the autonomy and controllability of the supply chain. This provides strong impetus for the high-quality development of China's steel industry and the modernization of the industrial chain.

The data for this article is sourced from: official disclosure of Rizhao Iron and Steel Group and public patent documents