SPECIFICATIONS OF PERSIAN FOOLAD INDUSTRIAL GROUP PRODUCTS
Ductility and weldability
The Persian Foolad Industrial Group produces high strength products that also have high ductility. The relative elongation of some of rib-400 products tested in the company have been at the level of A2 (rib 340). This means that, in addition to high strength, the products have the proper weldability and high resistance to fatigue and cyclic, dynamic and shocking loads. Fatigue and the more destructive cyclic loads, which cause lower steel strength failures, particularly in bridges because of alternative stress cycles, and tensile-pressure stresses that generate hysteresis loops, all significantly depend on the degree of steel ductility. this issue is more important in buildings and installations exposed to dynamic and shocking seismic stress
since the steel can break before it reaches the tensile strength and eventually cause the collapse of the
building. The Persian Foolad Industrial Group, utilizing cutting-edge technology and equipment, experienced domestic and international experts, and modern laboratory and research facilities, constantly endeavors to improve the mechanical properties of deformed rebars, including their high degree of ductility and increased strength. These achievements are due to the following reasons:
Given the effect of intersection of transverse and longitudinal ribs on stress and fatigue concentration, as proved in several tests and researches, the Persian Foolad Group has-taken a major step on this important issue by using the most modern CNC notching machines with highly accurate ribs, in which the rollers are designed in such a way that the transverse and longitudinal ribs never get close to each other, and standard-specified intervals are carefully complied with, which ultimately, cause more bonding between concrete and rebar.
The use of suitable billets for increasing the ductility of steel (affecting the Rm/Reh ratio increase), due to having alloying elements, entails higher spending on buying billets, which ultimately, results in enhanced mechanical properties and improved microscopic structures. This is especially important in large deformed rebars. Moreover, using original and standard machinery in the rolling mill is an important factor in producing rebars with standardized tolerance and dimensions and specific mechanical properties, associated with proper microscopic structures. The Persian Foolad Group uses front-line rebar manufacturing line and advanced machinery in all rolling processes, including rolling speed, billet temperature, and deformation rate per pass, in order to maintain completely stable conditions throughout the production line. Furthermore, in order for continuous quality control and improvement of products, all tests including chemical analyses and mechanical tests are regularly conducted on the products, using advanced laboratories and research facilities at the factory site.
All CLASS A3 (rib 400) rebar products manufactured in the Persian Foolad industrial group comply with the latest version of Iranian National Standard, and have a minimum tensile strength of 400 Mpa.