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Register a new userApply Heat treatment by Thermex to improve mechanical properties of reinforced steel Application research on reinforced bars manufactured in Arabian Steel Company (ASCO)
تطبيق المعالجة الحرارية بالتيرمكس لتحسين بعض الخواص الميكانيكية لقضبان فولاذ التسليح "دراسة تطبيقية لمعالجة قضبا نفولاذ التسليح المصنعة في الشركة العربية لدرفلة الحديد (اسكو)"
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يتم انتاج قضبان التسليح في مصنع الشركة العربية لدرفلة الحديد آسكو، بمواصفات عالية من حيث المرونة و قوة الشد، التي تصل الى مستويات عالية، مقارنة باستخدام المعادن الخلائطية, و ذلك عن طريق استخدام المعالجة الحرارية بالتيرمكس أثناء العملية الانتاجية على خط الانتاج. المعالجة بالتيرمكس هي تعريض قضبان الفولاذ خلال العملية الانتاجية للماء بشكل مفاجئ ضمن ظروف انتاجية محددة و من ثم تتم عملية المراجعة الذاتية من خلال اعادة التسخين الذاتية بعد الخروج من التيرمكس و من ثم التبريد الطبيعي في درجة حرارة الجو المحيط, تتم هذه العملية على خط الانتاج بعد خروج الفولاذ من مرحلة الدرفلة النهائية, و تكون العملية ثابتة و مؤتمتة. تركزت الدراسة على التيرمكس و مكوناتة في المرحلة النهائية من عملية الدرفلة, و تأثيره على خواص الشد و القساوة لقضبان فولاذ التسليح.
In line quenching and tempering has allowed ASCO (Arabian Steel Company) to have higher ductility bar at higher strength levels compared with classic rebar production with substantial reduction in alloy consumption by using heat treatment (thermex) during production proses on production line. QTB (Quenching Tempering Bars) is an alternate means of strengthening long bars by quenching the bars with water and then allowing the bars to self-tempering and hardened case, the process is performed in line with the rolling process, after the finishingarea. The process is stable and controlled, and it's effective on hardness and strength properties on reinforced steel bars The research has concentrate on Thermex and Thermex elements in finishing area of rolling process.
References used
GEORGE E . TOTTEN . stell heat treatment metallurgy and technologiessecond . CRC press . 2007 . p 883
LUNDBERG SVEN- ERIK. Quenched and Self-tempered Rebar – process Overview, Layouts, Operational parameters and Cost Savings. AISTech 2010 proceedigs, Volume II , pp. 719- 726
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Waste resulting from construction operations affect the project, so that it adds
financial values of the project, without leading to any improvement in it,or to improve the
functional capabilities of the project, and lead to increased quantities re
quired, thereby
increasing the cost of the project and the accumulation of environmentally harmful solid
waste.
In this research, We will discuss the most important factors affecting the increase
waste in the Syrian construction projects by identifying the most important causess that
lead to an increase in waste materials, as well as identify the most important causes that
lead to increased waste associated with design, storage or supervision. These factors will
be arranged to determine the most effective on the project. At the end of the research we
will formulated mathematical model to Optimize cutting of reinforced steel bars and
Lindo program will be used to solve this model. It has been shown by the study that a
large proportion of waste is resulting from random cutting bars.
Thepaper studies the mechanical properties ofsteel fibers reinforced lightweight
concrete.This kind of concrete is produced by usingscoria aggregateswhich can be found
abundantly in Syria. Thelightweight concrete mixeswere designed for three differ
ent
percentage of steel fibers (0, 0.5, 0.75)%.
Different tests were performed to determine mechanical properties of product
concrete such as compressive strength, elasticity modulus, splitting tensile strengthand
flexural strengthalso; the stress–strain diagram of produced lightweight concrete was
established under compression.
The results showedanincrease of the compressive, splitting tensile and flexural
strengths reach up 16.9%, 25.6%, and 53.6% respectivelywhen the steel fibers were used.
Also the results indicated the importance of using the steel fibers to improve the
performance of concrete and change its brittle behavior to ductile behavior.
In this work, Ck85 carbon steel was subjected to cyclic heat
treatment.
Process that consisted of cyclic short-duration (3.4 minutes)
holding at 800 C (above Ac3 temperature) followed by forced air
cooling. After 8 cycles (about a total 1 hour du
ration of heating and cooling cyclic), the microstructure mostly contained fine ferrite
grains and spheroidzed cementite. This microstructure possessed
an excellent combination of strength and ductility. The disintegration of lamellar pearlite through dissolution of cementite
at boundaries lamellar during short-duration holding above Ac3
temperature, and the generation of lamellar defects during nonequilibrium forced air cooling were the main reasons of
accelerated spheroidization. The strength initially increased mainly
due to the presence of finer microconstituents (ferrite and pearlite)
and then marginally decreased with the elimination of lamellar
pearlite and appearance of spheroid cementite in the microstructure.
In this research, specimens of aluminum alloy 6061 were
received, and chemical composition was investigated. After
that solution heat treatment was applied on it at 530°C, a
section of these specimens was quenched in water and anther
quenched in
oil, and two sections were aged at 160°C for
times (1,3,5 h), and thus obtained six samples differ in
condition of heat treatment in addition to as received
specimen.
In this research, a simple cylinder concrete model was analyzed. This model is simple and single in the center of cylinder for plain reinforcement and cubic model for deformed reinforcement. If we made a tension load on the reinforcement bar until we
reach to the destruction by using non-linear analysis for the three dimension subjects by using the finite element ANSYS to study the bond stress between the concrete and the reinforcement.
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