Special Steel Mill for Electrical Steel and AHSS Steel Rolling

The Special Steel Mill is designed for the efficient rolling of hard materials, such as electrical steel and other special-purpose steels, including Electrical Steel and Advanced High-Strength Steel (AHSS). In the steel industry, the challenge of rolling thinner and harder materials requires specialized technology to ensure precision and quality. Special Steel Mills from Primetals Technologies, including the HZ Mill, 12-high CR Mill, KZR Mill, and 6-high Universal Crown Control Mill (UC-MILL), are equipped with small-diameter work rolls to meet these demands effectively.

Special steel mills are engineered to address the challenges of rolling hard materials, particularly electrical steel and AHSS.

HZ Mill (Advanced Split Housing ZR Mill)

The HZ Mill, an advanced split housing ZR Mill, is specifically designed to address the challenges associated with conventional ZR mills, such as limited roll gap opening and indirect-driven AGC cylinders. Primetals Technologies has enhanced this mill with a large gap opening, facilitating easy strip threading and recovery from strip breakage. The mill offers a flexible roll diameter configuration, allowing for greater versatility in processing various materials, including High-Strength Steel (HSS) and Advanced High-Strength Steel (AHSS).

Equipped with a high-response direct-driven AGC cylinder, the HZ Mill ensures precise gauge accuracy, while the rolling force is directly measured by a load cell, providing superior control and stability during the rolling process. These features collectively enhance productivity and ensure stable rolling performance, making the HZ Mill a robust solution for efficiently rolling hard materials.

12-High CR Mill

The 12-high Cold Rolling (CR) Mill, developed independently by Primetals Technologies, is engineered to roll stainless steel, copper alloys, and nickel alloys with exceptional precision and shape control. Compared to traditional ZR mills, the 12-high CR Mill utilizes fewer rolls, offering greater shape control and a significantly broader work roll diameter range. This allows for the precision rolling of a diverse range of materials, from soft to hard, including electrical steel and stainless steel. The mill features a split-type back-up roll frame, enabling automatic work roll changing, which enhances strip threading performance and simplifies maintenance.

Additionally, the mill can be modified from a conventional 4-high mill to a 12-high configuration, with a shift function added to the intermediate roll to prevent back-up roll contact marks from transferring to the strip. This capability makes the 12-high CR Mill ideal for rolling materials with strict surface requirements, ensuring high-quality output and operational efficiency.

Benefits of the Special Steel Mills

• Boosted productivity: the HZ Mill and 12-high CR Mill streamline operations with features like large gap openings and automatic work roll changing, enhancing throughput and efficiency for rolling electrical steel and stainless steel.
• Precision control: advanced technologies ensure exceptional gauge accuracy and shape control, allowing for the production of high-quality steel products that meet stringent industry standards.
• Versatile solutions: flexible roll configurations and adaptable mill setups accommodate diverse materials, enabling customers to respond to market demands and expand their product range effectively.