Thick Plate Technology for the Last 100 Years: A World Leader in Thermo Mechanical Control Process

Tsuyama, Seishi

doi:10.2355/isijinternational.55.67

Cited by 23 publications

(12 citation statements)

References 25 publications

(17 reference statements)

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“…Upgrading runout tables and developing improved ACC facilities remains a critical area for process development in plate and strip mills across the globe . Advanced cooling systems have been designed, for example, the Super‐OLAC of JFE Steel Corporation and CLC‐μ of Nippon Steel Corporation (now Nippon Steel and Sumitomo Metals Corporation, NSSC), with the aim to combine heavy ACC that approaches theoretical cooling rate limits with improved uniformity of the plate surface temperatures. For example, NSSC reported that with their new cooling equipment the temperature variance across the plate width can be reduced by approximately a factor of two from 50 to 30 °C, as compared to conventional accelerated cooling…”

Section: Introductionmentioning

confidence: 99%

Simulation of Runout Table Cooling

Guemo

Prodanovic

Militzer

2018

steel research int.

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Accelerated cooling on the runout table of hot mills has become a key technology to produce thermo‐mechanically controlled processed (TMCP) steel plates and strips. During runout table cooling austenite decomposition takes place and determines the final microstructure and, hence, the properties of the hot‐rolled steel. There is an increased tendency to produce higher strength TMCP steels with complex microstructures including bainite and martensite. To tailor these microstructures, it is required to carefully design runout table cooling paths and lower the cooling stop and coiling temperature, respectively, for producing flat products with homogeneous mechanical properties. Thus, simulation of runout table cooling is a crucial aspect of process modeling. In the present paper, the status of runout table simulation approaches is reviewed. In particular, the three boiling mechanisms of water cooling, that is, nucleate, transition, and film boiling are discussed. The development of appropriate heat transfer coefficients is rather mature for nucleate and film boiling, respectively. Modeling and controlling the transition boiling regime below the Leidenfrost temperature remains a challenge as heat extraction rates increase with decreasing steel temperature. The status of heat transfer simulations for transition boiling is thus discussed in detail. Currently, the proposed heat transfer correlations, while increasingly based on the underlying physics, still contain a number of empirical parameters that require tuning with experimental and/or mill data. The review is limited to information in the open literature while recognizing that a number of proprietary in‐house runout table cooling models exist that are developed either by equipment makers or steel companies to control accelerated cooling to lower cooling stop or coiling temperatures.

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Section: Introductionmentioning

confidence: 99%

Simulation of Runout Table Cooling

Guemo

Prodanovic

Militzer

2018

steel research int.

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“…Specifically, work piece can be water cooled by using water cooling device near the mill for adjusting the temperature of steel slab effectively between rolling passes. 28) The "rolling-cooling" synchronous technology has obvious advantages for increasing deformation penetration and developing the fine-grain structure in the surface of plate. Schematic illustration of Inter-pass cooling is shown in Fig.…”

Section: Development and Application Of Rolling With Interpass Coolinmentioning

confidence: 99%

Development and Application of Thermo-mechanical Control Process Involving Ultra-fast Cooling Technology in China

Wang

et al. 2019

ISIJ Int.

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Thermo-mechanical control process (TMCP) is an important and effective rolling technology for microstructural control to obtain excellent mechanical properties, such as high strength, excellent toughness and other performances, which consists of controlled hot rolling and controlled cooling. RAL laboratory in China has been making efforts to develop ultra-fast cooling (UFC) technology, which is referred as the core technology for New Generation (NG)-TMCP. The ongoing development of UFC technology, with high cooling capacity and uniform cooling control, provides the effective control of cooling paths for a wide range of water-cooled steel strips and plates. Here, the development and characterization of UFC technology are introduced, and advanced cooling system (ADCOS) for the UFC equipment will be elucidated as well. Moreover, the superior mechanical properties can be obtained by inter-pass cooling technology during rolling processing, which is characterized by water-cooling between controlled rolling passes and further reheating due to the internal heat capacity of plate on its own. The resultant theory and technology can achieve resource conservation, energy saving and emission reduction for green products in the manufacturing process for upgrading of steel industry in China. KEY WORDS: thermo-mechanical control process (TMCP); ultra-fast cooling (UFC); advanced cooling system (ADCOS); strip and plate; inter-pass cooling. 2. Research and Development of Ultra-fast Cooling Technology and Equipment 2.1. Historical Review of Ultra-fast Cooling for Steel Strips and Plates Since the end of the last century, CRM, the top steel research institution in Europe, had carried out in-depth studies in ultra-fast cooling process and developed the ultra-fast cooling system for hot-rolled steel strips and

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“…In Japan, a process called "Super-CR", in which cooling equipment is installed in the side guides in close proximity to the mill, has been developed and applied in order to shorten the waiting time for plate temperature adjustment. 15) Yu et al 16) studied the deformation and mechanical properties of heavy plate in two-dimension (2D) through gradient temperature rolling. Few researches investigate the effect of water cooling on edge shape of heavy plate during hot rolling.…”

Section: Notementioning

confidence: 99%