Anhui Litong Rare Earth Steel Cable Co., Ltd.: Galvanized Steel Strand, Building a Safe Line of Defense Across Multiple Fields
I. Core Structure and Classification: Adapting to Diverse Needs
The core advantage of galvanized steel strand stems from its scientific structure: it uses multiple high-carbon steel wires as the base material, adopting a concentric stranding method of "central wire + outer layer wires". The outer wires are evenly arranged around the central wire and twisted, which ensures uniform force distribution among the wires, greatly improves the overall tensile strength, and maintains good flexibility. The company's galvanized steel strands mainly include the 1×7 type (7-wire stranding), supplemented by special specifications such as 1×19 type, to meet the load-bearing requirements of different scenarios.
In terms of classification, it can be divided into ordinary stranded type and compacted type according to cross-sectional structure—the former is suitable for conventional scenarios, while the latter reduces wire gaps through compaction technology to enhance structural density and corrosion resistance; according to tensile strength, it is classified into grades such as 1570MPa, 1770MPa and 1860MPa, corresponding to different load requirements; according to zinc layer thickness, there are ordinary galvanized and thick galvanized types. The thick galvanized products have a zinc layer weight of ≥610g/m², suitable for high-corrosion environments. The rich specification system enables the products to accurately match the needs of various projects.
II. Outstanding Performance: Dual Advantages of Strength and Weather Resistance
(1) High-Strength Bearing Capacity: Safety Guarantee
Relying on high-quality raw materials and precision stranding technology, the company's galvanized steel strands have a tensile strength of up to 1860MPa, capable of withstanding huge tensile force and impact loads. In scenarios such as bridge suspension and geotechnical anchoring, it can stably transmit stress, resist deformation risks caused by external loads, and provide core guarantee for the safety of engineering structures. Its breaking force is much higher than the industry average, ensuring long-term reliable use without failure.
(2) Galvanized Protection: Strong Corrosion Resistance
The galvanized layer is the "anti-corrosion armor" of the steel strand. The company adopts the hot-dip galvanizing process, which forms a metallurgical bond between the zinc layer and the steel wire, resulting in strong adhesion and resistance to peeling. It can effectively isolate air, moisture and corrosive media to prevent steel wire rust. In harsh environments such as coastal salt spray and industrial humidity, the service life of the product is 2-3 times longer than that of ordinary steel strands, significantly reducing operation and maintenance replacement costs.
(3) Flexibility and Processability: Adapting to Complex Scenarios
Despite its outstanding strength, the galvanized steel strand still maintains good flexibility, which can be bent, cut and installed according to engineering needs, adapting to complex construction environments such as bridges, towers and foundation pits. Its stranded structure reduces stress concentration on individual steel wires, maintaining structural stability under repeated bending and long-term stress, and combining construction convenience with use reliability.
III. Core Production Process: Precision Control from Raw Materials to Finished Products
(1) Raw Material Selection: Controlling Quality from the Source
The company adheres to selecting high-quality high-carbon steel wire rods from Shagang Group, with sulfur and phosphorus content below 0.025% and stable mechanical properties, laying a solid foundation for product strength; the zinc ingots adopt Grade 0 high-purity zinc with a purity of ≥99.99%, ensuring a uniform and dense galvanized layer. Each batch of raw materials must undergo multiple inspections such as composition analysis and mechanical testing, and unqualified raw materials are firmly rejected.
(2) Wire Drawing and Stranding: Precision Determines Performance
The wire rods are made into specified steel wires through multiple cold drawing processes, with diameter tolerance controlled within ±0.02mm to ensure uniform performance of single wires; in the stranding process, computer-controlled multi-head stranding equipment is used to strictly control the lay length and tension, ensuring tight arrangement and balanced force of the wires, and avoiding performance shortcomings caused by uneven stranding.
(3) Hot-Dip Galvanizing and Testing: Building a Solid Defense for Protection and Quality
The continuous hot-dip galvanizing process is adopted, where the steel wires undergo pickling, annealing, hot-dip galvanizing and other processes, resulting in uniform and controllable zinc layer thickness; the finished products must pass multiple tests including zinc layer adhesion, tensile strength, torsion performance and corrosion resistance, while complying with GB/T 1200-2016 standards and international ASTM A475 requirements, with a pass rate stably above 99.9%.
IV. Wide Applications: "Safe Link" Across Multiple Fields
(1) Power Transmission: Stable Support for Lifeline
In power lines, galvanized steel strands are used as overhead ground wires and tower stay wires, resisting extreme weather such as strong winds and ice coating, and protecting the safe operation of transmission lines. The company's products have been applied in multiple provincial power grid projects, adapting to 110kV-500kV voltage levels, with a total supply exceeding 8,000 kilometers, and have gained recognition from State Grid Corporation of China for their high stability.
(2) Construction and Infrastructure: "Backbone" of Engineering Structures
In bridge construction, it is used for suspension systems and prestressed anchoring; in geotechnical engineering, it serves as the core material for foundation pit support and slope anchoring; in building curtain walls, it undertakes load-bearing and fixing functions. With high strength and corrosion resistance, the products have assisted in the smooth completion of projects such as the Hong Kong-Zhuhai-Macao Bridge auxiliary project and Hefei Metro foundation pits.
(3) Communication and Other Fields: Guarantee for Stable Transmission
In the communication industry, it acts as a load-bearing component for communication cables, ensuring the stability of cable erection at high altitudes; at the same time, it is widely used in highway guard cables, port terminal fixing, agricultural greenhouse frames and other scenarios, becoming a cross-industry "versatile" material.
V. Future Outlook: Technological Upgrading to Empower Green Development
Facing the market demand for high-performance and long-life materials, the company will continue to optimize production processes, develop upgraded products such as zinc-aluminum alloy coatings and rare earth-modified galvanized steel strands, and further improve corrosion resistance and strength; at the same time, it will promote energy-saving transformation of production processes, reduce energy consumption per unit product, and align with the "dual carbon" goal. In the future, Anhui Litong Rare Earth Steel Cable Co., Ltd. will continue to focus on quality, providing higher-quality galvanized steel strand products for power, infrastructure, communication and other fields, and building a solid safe line of defense for projects.