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![Recrystallization during hot rolling (adapted from Figure 1.8 of [5]).](profile/Vincent-Musonda-2/publication/323969640/figure/fig1/AS:665766785466368@1535742579861/Recrystallization-during-hot-rolling-adapted-from-8-of-5.png)
Recrystallization during hot rolling (adapted from Figure 1.8 of [5]).
Source publication
Reinforced bars (rebars) are Thermo-mechanically treated (TMT) bars hot rolled from steel billets produced from scrap melted in an Electric Arc Furnace (EAF) at a temperature of about 1600 ° (usually 1580°). Weight per meter of a low carbon steel rebar is one aspect which has been neglected by some steel producers during the tensile testing in the...
Contexts in source publication
Context 1
... composed of coarse grains of austenite. The austenite grain structure begins to change when the billet passes through the rollers and becomes compressed. During this stage, the austenite grains are elongated into a pancaked structure, and each grain experiences a change in dimension, usually with deformation bands induced within the grains (Fig. 1) [4,5]. of ...
Context 2
... composed of coarse grains of austenite. The austenite grain structure begins to change when the billet passes through the rollers and becomes compressed. During this stage, the austenite grains are elongated into a pancaked structure, and each grain experiences a change in dimension, usually with deformation bands induced within the grains (Fig. 1) [4,5]. of ...
Context 3
... a semifinished product, the microstructure of the billet before rolling is initially composed of coarse grains of austenite. The austenite grain structure begins to change when the billet passes through the rollers and becomes compressed. During this stage, the austenite grains are elongated into a pancaked structure, and each grain experiences a change in dimension, usually with deformation bands induced within the grains (Fig. 1) [4,5]. of ...
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Citations
... Investigating mechanical properties of deformed reinforcement steel bars have become area of interest by many scholars particularly number of statistical studies conducted explicitly with the variability of the mechanical properties of reinforcing steel bars 2-18 . Effect of linear density properties and chemical composition variability studies were also investigated 19,20 . ...
The paper presents statistical analysis of mechanical strength and linear density properties of deformed reinforcing Grade 60 steel bars. Two different lots of samples are identified based on test years for the years 2015–2017 as Lot 1 and 2018–2020 as Lot 2. Yield strength (YS), tensile strength (TS), elongation, mass per length and characteristic ratio of TS and YS are analyzed for rebar diameters of 8, 10, 12 and 16 mm considering both lots. Mechanical and linear density properties are compared statistically using range, mean, standard deviation, coefficient of variance, skewness and kurtosis of the recorded sets of values. Moreover, the results of YS, TS and elongation are analyzed separately by one-way analysis of variance for both lots. The result shows that the aggregate mean values of YS, TS and elongation for Lot 1 and Lot 2 are 593.1 MPa, 701.1 MPa, 14.78%; and 572.5 MPa, 673.8 MPa, 15.47%, respectively. Even though there is a slight decrement in values of YS and TS and increment in elongation from Lot 1 to Lot 2, both lots exceeded values recommended by ASTM A615 standard. Furthermore, with 95% confidence interval, one-way analysis of variance showed that the aggregate data of rebars are dissimilar in terms of YS, TS and percentage elongation with figures showing decrement from Lot 1 to Lot 2.
This study examines the variation in mechanical properties of reinforcing steel bars and its impact on the seismic design of reinforced concrete (RC) bridge columns. The variation of mechanical properties of rebar as per American Society for Testing and Materials (ASTM) A615 and ASTM A706 is studied using 685,351 and 950,000 tensile testing results obtained between the years of 2009 and 2019 from various mills across North America. An analysis is performed using classification and regression trees (CART) to identify parameters with the highest relative influence considering source mill, bar size, and weight per meter. Probability distribution functions are developed for yield and ultimate tensile strength data. The beta distribution shows better agreement with the distributions of yield strength and ultimate tensile strength. Results show that 0.12% of the tensile test data fall below the minimum ASTM standard requirements. In addition, the study also examines the effect of the variability of yield strength of longitudinal rebars on the seismic response of circular bridge columns using fragility analysis.
