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This article will specifically share the material characteristics and the quality control factors of raw materials of prestressed concrete steel wires for your study and reference.
The carbon content of prestressed concrete steel wire is generally between 0.6% and 0.90%. Should comply with the relevant national standards. The diameter of the wire rod is φ6.5~14.0mm, and the metallographic structure of the wire rod is mainly sorbate, and there should be no martensite, reticular cementite, and structures that are harmful to performance. Next, let's learn about the material characteristics and the quality control factors of raw materials of prestressed concrete steel wires.
High-performance structural prestressed concrete steel wire requires high-quality clean steel wire to manufacture.
Prestressed concrete requires prestressed steel wire to have comprehensive mechanical properties such as sufficient tensile strength, excellent toughness, high fatigue strength, and low-stress relaxation.
When PC steel wires, PC steel strands, PC steel rods, and other prestressed steel wires made of special wires for prestressed steel are used in concrete products, it can not only save steel but also significantly improve the performance of concrete during use, delay the appearance of cracks and reduce high loads.
The width of crack expansion under the horizontal, reducing or even eliminating the deflection under the service load can improve the shear bearing capacity and fatigue strength of concrete products.
Raw material quality control factors
Size control—control the rolling temperature to make the rolling temperature of the same batch tend to be consistent, and try to reduce the size fluctuation of the rolled piece caused by the temperature change affecting the deformation resistance and spreading.
The implementation of micro-tension rolling reduces the influence of rolling tension, the most important factor causing the dimensional accuracy of the rolling stock, to the minimum. Optimize the roll pass design and enhance the error elimination function of the pass system in the rolling process. The Morgan sixth-generation finishing mill is used, equipped with ORBIS optical caliper, which can detect line diameter deviation, ovality, and other indicators online.
Surface quality-Implement billet grinding, control billet quality, remove various defects on the surface of billets and prevent the formation of scars, pits, folds, cracks, inclusions, and other surface defects caused by the introduction of wire rods; avoid the formation of deep grooves due to improper handling of billet when the wire is rolled. Thoroughly remove the head and tail of the billet to avoid shrinkage, porosity, delamination, inclusions, and other defects in the wire.
Chemical composition-Improve the purity of molten steel through the long-flow converter or high-proportion hot metal hot charging electric furnace steelmaking process. Import high-quality iron ore, select high-purity raw and auxiliary materials reduce impurity elements into molten steel. Use LF furnace or supplemented by VD method or RH method for secondary refining to accurately adjust the chemical composition of molten steel.
Cleanliness—Strictly control the process of ladle refining, tundish metallurgy, and continuous casting, so that non-metallic inclusions are fully removed, and high cleanliness of steel is achieved, which is beneficial to improve the processing performance and comprehensive mechanical properties of cold heading steel wire rods.
Segregation-Electromagnetic stirring at the end and advanced dynamic modular light reduction technology are used during continuous casting to minimize the center segregation of the billet and avoid the formation of band-like structure and center segregation in the wire.
Uniformity-In order to make the steel highly uniform, various technologies such as extremely low superheat casting, mold electromagnetic stirring, end electromagnetic stirring, dynamic light pressing, constant pulling speed casting, and uniform heating are used in steel manufacturing process.
Metallographic structure-Controlled rolling and controlled cooling are implemented on Morgan's sixth-generation rolling mill so that the wire rod can obtain a metallographic structure that is conducive to drawing or cold heading processing.
If you want to get more relevant information after reading the above, we are happy to share our professional knowledge with you.
As an experienced manufacturer of prestressed concrete products, CHUNPEN has become a leader in the industry with our excellent manufacturing technology and strict quality inspection system. We have a professional production team that fully controls the selection of products, manufacturing processes, and exports. At the same time, we will also provide thoughtful services and effective solutions according to the diverse needs of customers. If you want to buy our prestressed concrete steel wire, please contact us immediately!