New economically effective steel strips production technologies (based on materials of international conferences)

2020 ◽  
Vol 76 (2) ◽  
pp. 153-162
Author(s):  
B. N. Matveev
Keyword(s):  
Raw Materials ◽  
Rolling Mills ◽  
Arc Furnaces ◽  
Steel Strips ◽  
Steel Coils ◽  
Treatment Facilities ◽  
Production Technologies ◽  
Endless Rolling ◽  
Hot Rolled ◽  
Wide Assortment

Production of steel rolled products by using traditional metallurgical technologies are rather material- and energyintensive and its concentration at gigantic steel plants resulted in the increased expenses for transportation of raw materials and finished products. To solve the problems, a practice of comparatively small metallurgical plants (mini-mills) construction is becoming widespread in the world steel industry. The mini-mills include modern electric arc furnaces, ladle steel treatment facilities and steel continuous casters combined with continuous rolling mills. The review complied from materials of international conferences, taken place in 2015–2019. In the review achievements in equipment and technology of metal products at mini-mills development considered, as well as analysis of modern economical methods of steel coils presented. It was shown, that the methods of strips endless rolling, widely used already at industrial scale in several countries, enable producing rather thin hot-rolled strips from liquid steel. Universal casting-rolling aggregates (CRA) developed, by which high quality strips of rather wide assortment can be produced. For a mass production of rather thin (down to 0.8 mm) hot-rolled strips, which can in many applications substitute more expensive coldrolled ones, compact aggregates of endless casting-rolling are recommended, which provide the yield of up to 98%. Concepts of the CRA elaborated for production of steel strips of wide assortment, from ultrathin strips to thick (25 mm) ones. The concepts include application of thermomechanical treatment to increase the mechanical properties of the rolled products from various steels, including low-alloyed ones.

Shape Measurement for Hot Rolled Steel Strips

1979 ◽  
Author(s):  
P. Petit ◽  
G. Tourscher ◽  
M. Machet ◽  
M. Kassel
Keyword(s):  
Shape Measurement ◽  
Rolled Steel ◽  
Steel Strips ◽  
Hot Rolled ◽  
Hot Rolled Steel

scholarly journals Analysis and prevention of vertical cracking phenomena during deep drawing of hot- rolled sg295 steel strips

1996 ◽  
Vol 27 (5) ◽  
pp. 1241-1250 ◽  
Author(s):  
Sunghak Lee ◽  
Chang Gil Lee ◽  
Dongil Kwon ◽  
Sung-Ho Park ◽  
Nack J. Kim
Keyword(s):  
Deep Drawing ◽  
Steel Strips ◽  
Hot Rolled

Influence of oxide scales on the corrosion behaviors of B510L hot-rolled steel strips

2016 ◽  
Vol 23 (7) ◽  
pp. 769-778 ◽  
Author(s):  
Cheng Man ◽  
Chao-fang Dong ◽  
Hui-bin Xue ◽  
Kui Xiao ◽  
Xiao-gang Li ◽  
...  
Keyword(s):  
Rolled Steel ◽  
Oxide Scales ◽  
Steel Strips ◽  
Corrosion Behaviors ◽  
Hot Rolled ◽  
Hot Rolled Steel

Development of Tensile Test to Investigate Mechanical Adhesion of Thermal Oxide Scales on Hot-Rolled Steel Strips Produced Using Different Finishing Temperatures

2011 ◽  
Vol 462-463 ◽  
pp. 407-412 ◽  
Author(s):  
Komsan Ngamkham ◽  
Satian Niltawach ◽  
Somrerk Chandra-ambhorn
Keyword(s):  
Carbon Steel ◽  
Low Carbon Steel ◽  
Ex Situ ◽  
Low Carbon ◽  
Coiling Temperature ◽  
Steel Strips ◽  
Thermal Oxide ◽  
Mechanical Adhesion ◽  
Hot Rolled ◽  
Scale Surface

The objective of this work was to carry out tensile tests to investigate the effect of finishing temperature on mechanical adhesion of thermal oxide scale on hot-rolled low carbon steel strips. Two hot-rolled low carbon steel strips were produced in an industrial hot rolling line by fixing a coiling temperature at 620 °C and varying finishing temperatures at 820 and 910 °C. Two testing methods were conducted. First, each of a number of samples was subjected to a given imposed strain with ex-situ imaging of scale surface after straining. Second, only one sample was strained in a test with ex-situ imaging of scale surface at every 2 mm elongation of the sample. A spallation ratio, an area where scale was spalled out and normalised by the total area observed by microscope, was plotted as a function of the imposed strain. These two methods gave the same tendency of results as follows. At a given strain, the spallation ratio of scale on steel produced using higher finishing temperature was larger. The gradient of spallation ratio with respect to the imposed strain of that scale was also steeper. This reflects the higher susceptibility of scale to spall out with increasing imposed strain. This behaviour might be related to the larger thickness of scale on steel produced using higher finishing temperature. For the second testing method, lowering the magnification of microscope to observe scale spallation from 50x to 20x increased R2 of the curve of spallation ratio versus the imposed strain, as well as improved the reproducibility of the test.

Microstructure, Texture and Inhibitors of the As-Cast and Hot Rolled Grain-Oriented Silicon Steel by Strip Casting

2016 ◽  
Vol 852 ◽  
pp. 101-104 ◽  
Author(s):  
Wen Qiang Liu ◽  
Cheng Shuai Lei ◽  
Han Mei Tang ◽  
Hong Yu Song ◽  
Hai Tao Liu
Keyword(s):  
Hot Rolling ◽  
Texture Evolution ◽  
Fiber Texture ◽  
Silicon Steel ◽  
Rolling Reduction ◽  
Recrystallization Annealing ◽  
Goss Texture ◽  
Steel Strips ◽  
Columnar Grains ◽  
Hot Rolled

The microstructure and texture evolution of the as-cast and hot rolled grain-oriented silicon steel strips was investigated, and the precipitation of the inhibitors of the hot rolled strips was clarified. The results showed that the microstructure of the as-cast strip was characterized by coarse columnar grains with strong {001}<0vw> fiber texture. The microstructure of hot rolled strips was composed of ferrite and pearlite and the microstructure was gradually refined with increasing hot rolling reduction. In the hot rolled strips, α and γ fiber textures were enhanced at the expense of initial {001}<0vw> fiber texture and Goss texture was generated in the surface and sub-surface layer with increasing hot rolling reduction. Besides, a great number of dispersed MnS particles with the size of 20-30nm were observed in the hot rolled strips. These MnS particles could act as the effective inhibitors during the second recrystallization annealing of the grain-oriented silicon steel.

Application of Recrystallization Texture Evolution Model to Predict Plastic Formability in Steel Strips

2014 ◽  
Vol 783-786 ◽  
pp. 1954-1960
Author(s):  
Toshiharu Morimoto ◽  
Y. Fuyuki ◽  
A. Yanagida ◽  
Jun Yanagimoto
Keyword(s):  
Recrystallization Texture ◽  
Texture Evolution ◽  
Steel Strip ◽  
Rolling Texture ◽  
Interstitial Free ◽  
If Steel ◽  
Taylor Model ◽  
Steel Strips ◽  
Cold Rolled ◽  
Hot Rolled

T.M.C.P.(Thermo Mechanical Control Processing) has been widely used to improveplastic formability in steel strips. We have produced interstitial free steel(IF steel) strips and ferriticstainless-steel strips through T.M.C.P. rolling method. Optimizing conditions of hot rolling, hotrolled annealing, cold rolling and cold rolled annealing, we developed texture prediction model. Wecan predict rolling texture accurately using the conventional Taylor model. Moreover, we preciselypredict recrystallization texture classifying the total number of microscopic􀀁 slips which arecalculated using the Taylor model. We consider that these calculated results provednucleation-oriented model and two types of recrystallization and grain growth mechanisms exit inour studies. One mechanism is that grains which had the small total number of microscopic slips arepreferred orientation for the hot rolled and annealed ferritic stainless-steel strip. The othermechanism is that grains which had the high total number of microscopic slips are preferredorientation for the cold rolled and annealed IF steel strip.

scholarly journals Biodiesel: Raw Materials, Production Technologies and Fuel Properties

2017 ◽  
Vol 9 (1) ◽  
pp. 317-369 ◽  
Author(s):  
Luiz P. Ramos ◽  
Vinícius Kothe ◽  
Maria Aparecida F. César-Oliveira ◽  
Aline S. Muniz-Wypych ◽  
Shirley Nakagaki ◽  
...  
Keyword(s):  
Raw Materials ◽  
Fuel Properties ◽  
Production Technologies

scholarly journals Strain Hardening and Stretch Formability Behavior of Triple Phase (TP) Steel Strips

2021 ◽  
Vol 27 (3) ◽  
pp. 152-156
Author(s):  
Maha ElMeligy ◽  
Taher El-Bitar
Keyword(s):  
Strain Hardening ◽  
Volume Fraction ◽  
Salt Bath ◽  
Holding Time ◽  
Forming Limit ◽  
Stretch Forming ◽  
Steel Strips ◽  
Stretch Formability ◽  
Rolled Condition ◽  
Hot Rolled

The current work explores the strain hardening and stretches formability behaviour of the developed Triple Phase (TP) steel. Double quenched TP steel strips posse three distinguished stages of strain hardening on tensile forming. 1st stage represents the highest n-value reflecting resistance to homogeneous deformation, where steel can be safely stretched. 2nd and 3rd stage reveals lower n-values, where localized thinning exist. On Erichsen testing, the relationship between punch forming force and punch stroke exhibits two forming regions. The 1st region is delineated by a straight line showing an ultra-high strain-hardening rate, which represents a reversible elastic stretch forming.  The 2nd forming region continues to a higher Erichsen punch stroke than that of the 1st region and presents the permanent plastic stretch forming behaviour.  It is found that bainite and martensite clusters created, by double quenching, in TP-steel exaggerated the elastic stretch forming limit 10 times higher than the as-hot rolled condition. 7 min. holding time of strips in the salt bath is considered the most effective for the creation of a useful volume fraction of the bainite phase. However, 21 min. holding time in salt bath grows martensite laths through the bainite aggregates, affecting negatively on stretch formability.

scholarly journals Operational characteristics of the paper factory's biological wastewater treatment facilities

2020 ◽  
Vol 17 (3) ◽  
pp. 162-167
Author(s):  
Yu. A. Feofanov ◽  
Keyword(s):  
Wastewater Treatment ◽  
Raw Materials ◽  
Treatment Plant ◽  
Organic Pollution ◽  
Oxidative Capacity ◽  
Biological Wastewater Treatment ◽  
Cleaning Efficiency ◽  
Operational Characteristics ◽  
Treatment Facilities ◽  
Paper And Pulp

The results of the biological wastewater treatment facilities of the paper factory using raw materials of different kinds (waste paper and pulp) are analyzed. The main performance characteristics of these structures (oxidative capacity for organic pollution and cleaning efficiency) at different loads on them have been determined. Recommendations have been worked out to improve the performance and efficiency of the treatment plant.

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