Prediction of the Mechanical Properties of Hot-Rolled Low Carbon Steel Strips in Correlation to Chemical Compositions and Rolling Conditions

2011 ◽  
Vol 462-463 ◽  
pp. 401-406 ◽  
Author(s):  
Jiratthanakul Noppon ◽  
Somrerk Chandra-ambhorn
Keyword(s):  
Mechanical Properties ◽  
Carbon Steel ◽  
Steel Strip ◽  
Low Carbon Steel ◽  
Chemical Compositions ◽  
Low Carbon ◽  
Coiling Temperature ◽  
Empirical Formulas ◽  
The Difference ◽  
Hot Rolled

Seven thousand sets of data consisting of mechanical properties, chemical compositions, and rolling parameters of industrial hot-rolled coils were analysed using multiple regression. This was to establish empirical formulas to predict mechanical properties of steel as a function of chemical compositions and rolling parameters. The empirical formulas predicting yield strength (YS), ultimate tensile strength (UTS) and percentage of elongation (EL) of low carbon steel strip were obtained, e.g. YS = 461+ 418 C + 61.6 Mn + 796 P ¬– 303 S + 159 Si + 146 Cu + 204 Ni + 49.7 Cr + 1127 V + 1072 Ti + 3674 Nb – 266 Mo – 6299 B – 76.3 Al – 557 Sn – 3.54 THK – 0.00758 WID – 0.114 FT – 0.223 CT. The rolling parameters in equation included finishing temperature (FT), coiling temperature (CT), thickness (THK) and width (WID) of strip. R-Square values for the formulas predicting YS, UTS, and EL were 82.3%, 90.1%, and 75.8% respectively. These equations were validated by using another 120 hot-rolled coils. The averages of absolute values of the difference between the predicted and actual values of YS, UTS, and EL were 9.6 MPa, 7.8 MPa, and 2.7 % respectively. Correlation of chemical compositions and rolling conditions with mechanical properties was discussed in the paper.

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.

Microstructures and Mechanical Properties of Low Carbon Steel Hot Rolled in Ferrite Region Based on CSP Line

2019 ◽  
Vol 90 (7) ◽  
pp. 1800643
Author(s):  
Xuewen Hu ◽  
Guoning He ◽  
Huan Peng ◽  
Bo Jiang ◽  
Chaolei Zhang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Carbon Steel ◽  
Low Carbon Steel ◽  
Low Carbon ◽  
Ferrite Region ◽  
Microstructures And Mechanical Properties ◽  
Hot Rolled

Cold Rolling Effect on Microstructure and Mechanical Properties of Low Carbon Al-Killed Steels

2015 ◽  
Vol 812 ◽  
pp. 315-320
Author(s):  
Enikö Réka Fábián ◽  
Áron Kótai
Keyword(s):  
Mechanical Properties ◽  
Cold Rolling ◽  
Low Carbon Steel ◽  
Optical Microscope ◽  
Low Carbon ◽  
Coiling Temperature ◽  
Steel Sheets ◽  
Hot Rolled ◽  
Ebsd Method ◽  
Scanning Electron

It have been studied the cold rolling effects on the microstructure of samples prepared from Al-killed low carbon steel sheets with high coiling temperatures. The microstructure of the hot rolled steels sheet is formed from ferrite and large carbides when the coiling temperature is high. The cold rolling affects the steel mechanical and electrochemical properties due to microstructural changes. We have studied the microstructure by optical microscope and scanning electron microscope. Low angles grain boundaries and the texture of samples were studied by EBSD method.

Prediction of shape defects during cooling of hot rolled low carbon steel strip

2004 ◽  
Vol 31 (1) ◽  
pp. 93-96 ◽  
Author(s):  
R. Colás ◽  
L.A. Leduc ◽  
M.A. Neri
Keyword(s):  
Carbon Steel ◽  
Steel Strip ◽  
Low Carbon Steel ◽  
Low Carbon ◽  
Hot Rolled

Effects of Niobium on Microstructure and Hardness of Base Plate and Coarse Grained HAZ of High Strength X70 Grade UOE Linepipe Steel

2020 ◽  
Author(s):  
Taro Kizu ◽  
Ryutaro Sakai ◽  
Hiroshi Imoto ◽  
Shigeru Endo ◽  
Frank Barbaro
Keyword(s):  
Mechanical Properties ◽  
Carbon Steel ◽  
Weld Zone ◽  
Low Carbon Steel ◽  
Coarse Grained ◽  
Microstructural Development ◽  
Chemical Compositions ◽  
Low Carbon ◽  
Austenite Grain Size ◽  
Niobium Content

Abstract The present study systematically evaluated base plates and Coarse Grained Heat Affected Zone (CGHAZ) properties of linepipe steels by using the controlled addition of increasing levels of niobium in a low carbon steel for comparison with other alloying combinations of Mn, Ni, Mo and V using laboratory melts and processed under simulated production conditions. The effects of niobium and other alloying elements on the mechanical properties and microstructural development, have been quantified with the intention of maintaining constant CGHAZ hardness in order that specific compositional effects can be directly compared. Characteristics of martensite and austenite (M-A) constituents in terms of size, shape and chemical composition has also been assessed. It is demonstrated that niobium additions up to 0.1 mass% in a low carbon steel design provide opportunities to improve pipeline mechanical properties, service performance and safety. For the CGHAZ, austenite grain size was limited as the niobium content increased. Weld HAZ microstructures were relatively similar with little influence of niobium content on MA character, although the hardness was noted to increase with increasing niobium content, which would be beneficial to ensure adequate resistance to weld zone softening. Bainite and small volume fractions of MA (nearly equal 2%) was a characteristic feature of CGHAZ of the materials having constant CGHAZ hardness, irrespective of chemical compositions examined. Other MA characteristics, such as size and cementite fraction, were also very similar among the steels.

Development of trimming technology for hot rolled ultra-low carbon steel

1993 ◽  
Vol 90 (7-8) ◽  
pp. 917-922
Author(s):  
Y. Matsuda ◽  
M. Nishino ◽  
J. Ikeda
Keyword(s):  
Carbon Steel ◽  
Low Carbon Steel ◽  
Low Carbon ◽  
Ultra Low Carbon Steel ◽  
Hot Rolled
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