Red Ring rolling stands are suitable for use in a wide range of situations. Multi-slit and high-speed technologies ensure that the requirements of high productivity of rebars are safely and efficiently guaranteed. Through bar-in-coil operation by V+ coilers, compact and twist free coils of bars and convex shapes are produced. State-of-the-art cooling technologies are available, for controlling the distortion of merchant bars, for thermo-mechanical rolling and for quenching & tempering both carbon and alloy grades, including stainless. The 2+4 EVO reducing and sizing mill further improves the dimensional accuracy of SBQ bars with a better control of metallurgical structure.
Primetals Technologies has installed or upgraded more than 1,000 rolling mills on six continents. These mills have set worldwide benchmarks for technological leadership, reliability and performance.
Red Ring Series 5
The Red Ring housingless stand design has a high reputation for roughing, intermediate and finishing applications. With more than 7,000 units commissioned worldwide, its design is renowned for its fully automatic operation, high rigidity and ease of maintenance. With an improved resistance to wear of key components, the Series 5 stands are available in different sizes and configurations.
Roughing Solutions for Billets, Blooms and Large Rounds
The roughing area plays an important role in the flexibility of production of a modern mill, the reduction of its layout space, the minimization of the costs of rolling and post-rolling operation. All with automatic operation and maintenance procedures, several applications are available:
- Forging-like rolling, it offers a cost-effective alternative to the ingot-casting route for large dimensions
- Compact rougher, for high reductions in a limited space
- Reversing 2-high stand rougher, in horizontal-vertical with highly flexible process
- Sliding stand rougher, it simplifies the manipulating system and associated civil works
Compact Cassette Rolling Stands (CCR)
The CCR stands suit the demanding requirements of special bar rolling. The extremely rapid cassette change facility, allows for flexible and efficient production, even for orders with a small number of billets. Available with monogrooved or multigrooved stands and also as a reversing block, CCR stands offer an easy access from the top and can be arranged in horizontal, vertical and 45° configurations. Its compact design reduces the building height requirements.
2+4 EVO Bar Reducing and Sizing Mill
The 2+4 EVO reducing and sizing mill uses a patented pass design. A reducing group with 2-Roll stands with high reduction is followed by a sizing group with 4-Roll stands with low reduction. While the 2-Roll high reduction guarantees the desired metallurgical structure, the 4-Roll low reduction provides excellent surface finish and size tolerance. The 2+4 EVO effectively employs the concepts of single-family and free-size rolling, which both reduce the required number of roll sets. The utilization and productivity of the mill are greatly improved.
Inline Cooling Technologies
In a modern mill the mechanical deformation actions are completed by inline controlled cooling technologies in order to obtain important benefits, like an improved process control, the reduction of product non-conformities and lower operation costs. From rebar quenching to thermo-mechanical rolling for quality bars and to inline solubilization of stainless grades, several solutions are available, all with automatic operation and assisted by validated thermo-metallurgical models.
Fig.1- Breakdown mill for special steels
Fig.2- Compact Cassette Rolling stand
Fig.3- EVO 2+4 bar reducing and sizing mill
Today’s steel producers face the dual challenge of ensuring on-time delivery and ever demanding product requirements, while also running a lean operation. Every day the management of a long rolling plant requires continuous optimization of both operating and business practices.
Utilizing the ongoing evolution in technology through data collection, communication, internet of things, control techniques and smart sensors, there is now more information available than ever before. This information will both advance control and monitoring of plant performance, revolutionizing long rolling mill plants worldwide and optimizing the entire value chain, along with improved and more flexible production, utilizing the latest control and drive technology.
Digitalization of Long Rolling Control System – Smart Sensors
Fig.1 - Smart Sensors for digitalization of Long Rolling Control System
Primetals Technologies Long Rolling Process Expert - Transparency for your entire production process
“You cannot manage what you do not measure” – Primetals Technologies Long Rolling Process Expert monitors and collects data from the raw material stage through to the finished product. Its domain extends from the enterprise resource planning (ERP), through Manufacturing Execution Systems (MES), to control systems and down to the plant device level.
The system delivers
- Valuable mill reports for operators and management
- Defined KPI’s to assess plant performance
- Plant to plant performance at corporate level
Fig. 2- Process Expert Long Rolling – cost efficient and modular automation system. Material tracking and roll shop management module included
As an original manufacturer of long rolling equipment, Primetals Technologies offers a true lifecycle support to its customers, and provides them with a unique range of products and services to maximize mill utilization and productivity over the entire plant lifetime. Follow this link to learn more about Lifecycle Services.
Hyundai Steel Company, Dangijn, South Korea
Type of plant
Large bar mill for special steels mainly for the automotive industry
1 million tons per year of billets and end products
Incorporates the state-of-the-art reversing breakdown stand and a finishing train with rolling/sizing stands
The mill produces a large portfolio of high quality products for the automotive applications, meeting the stringent Hyundai's quality requirements of metallurgy, dimensional tolerance and surface finish.