The Coefficient of Friction During Hot Rolling of Low Carbon Steel Strips

2002 ◽  
Vol 124 (4) ◽  
pp. 840-845 ◽  
Author(s):  
John G. Lenard ◽  
Leon Barbulovic-Nad
Keyword(s):  
Carbon Steel ◽  
Coefficient Of Friction ◽  
Hot Rolling ◽  
Linear Regression Analysis ◽  
Low Carbon Steel ◽  
Hot Strip Mill ◽  
Low Carbon ◽  
Process Variables ◽  
Steel Strips ◽  
The Coefficient Of Friction

Hot rolling tests were performed on low carbon steel strips with the objective of determining the coefficient of friction as a function of the process variables. The growth of the scale prior to rolling was controlled and the thickness of the layer of scale at the entry remained in the range of 20–100 μm, somewhat higher than in the finishing train of a hot strip mill. Roll separating forces, roll torques, the speed, the reduction and the entry temperature were monitored. The effective coefficient of friction was determined by using a one-dimensional model of the flat rolling process. The coefficient was chosen to allow matching the measured and calculated roll force and the roll torque. An empirical relation, connecting the coefficient of friction to process variables was obtained by non-linear regression analysis.

scholarly journals Hot Rolling Texture of Low Carbon Steel

1966 ◽  
Vol 52 (8) ◽  
pp. 1171-1179 ◽  
Author(s):  
Haruo KUBOTERA ◽  
Kazuhide NAKAOKA ◽  
Takashi NAGAMINE
Keyword(s):  
Carbon Steel ◽  
Hot Rolling ◽  
Low Carbon Steel ◽  
Rolling Texture ◽  
Low Carbon

Microstructure and Properties under Alternating Magnetism after Hot Rolling

2014 ◽  
Vol 1004-1005 ◽  
pp. 1256-1259
Author(s):  
Shen Bai Zheng ◽  
Shi Jie Liu ◽  
Hong Bin Li ◽  
Bin Feng ◽  
Xue Song Hui
Keyword(s):  
Magnetic Field ◽  
Carbon Steel ◽  
Cold Rolling ◽  
Grain Growth ◽  
Hot Rolling ◽  
Magnetic Field Intensity ◽  
Raw Materials ◽  
Low Carbon Steel ◽  
Low Carbon ◽  
The Magnetic Field

The austenite steel after rolling was radiated by the alternating magnetism, and the effects that alternating magnetic on the austenite transition was studied. The result shows that the alternating magnetism promotes the austenitic grain growth of low carbon steel. If the magnetic field intensity is increased, it could provide better performance of raw materials to cold rolling processing.

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.

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