Upgraded Standards for Prestressed Concrete Steel Wire

Driven by the quality enhancement and upgrading of infrastructure, the large-scale implementation of new energy projects, and the comprehensive advancement of green manufacturing policies, the prestressing steel wire industry has moved beyond extensive production models to enter new phase of development characterized by higher standards, higher precision, intelligence, and eco-friendliness.

The implementation of new national standards（GB/T 5223-2025 Steel Wire for Prestressing of Concrete）—coupled with the iterative evolution of intelligent manufacturing technologies—has further enhanced product safety performance, structural stability, and service durability.

As a professional manufacturer of prestressing steel wire, we follow industry standards and technological trends, leveraging our intelligent and low-carbon production capabilities to supply high-quality steel materials for wide range of engineering projects.

I. Comprehensive Enhancement of Industry Quality

On May 1, 2026, the new standard for prestressing steel wire GB/T 5223-2025 came into effect, as the core foundation for the industry's quality upgrade. This standard integrates and supersedes two previous standards—GB/T 5223-2014 and GB/T 30828-2014—thereby achieving the unification and optimization of industry standards. 

It thoroughly resolves long-standing issues such as fragmented standards, inconsistent technical specifications, and chaotic testing protocols, ensuring the entire process of product manufacturing, inspection, and acceptance is governed by authoritative regulations.

1.1 Upgraded Core Mechanical Performance Indicators

The new standard significantly optimizes the load-bearing performance of the product while tightening requirements for several critical parameters. This fundamentally enhances product precision and overall performance, aligning them with the same requirements of high-end infrastructure projects.

Specifically, the new standard raises the minimum ratio of the 0.2% yield force to the tensile strength from 85% to 88%, thereby effectively bolstering structural load-bearing stability and safety. Concurrently, it has stricter limits on key parameters such as elongation, dimensional tolerance, straightness, and weight deviation, as below:

1.2 New Specialized Testing

Addressing the complex service conditions associated with offshore engineering, nuclear power, long-span bridges, and wind turbine towers, the new standard introduces three mandatory testings: hydrogen embrittlement susceptibility, stress corrosion, and fatigue performance. This measure serves to reduce risks—such as brittle fracture, corrosion-induced failure, and long-term fatigue damage—at the source, thereby fully meeting the application requirements for ultra-high-strength prestressing steel wire with 1960 MPa and above. 

Currently, our production line has undergone the necessary modifications according to the new standard; consequently, our products have completed the full suite of tests mandated by the new national standard. With comprehensive qualifications and acceptance procedures, we can support wide range engineering projects.

II. High-Standard Intelligent Manufacturing

Today, industry competition has evolved from price into a comprehensive capabilities encompassing quality, precision, and stability. Traditional production models can not meet the standards of modern engineering; consequently, intelligent and digitized production has become a core advantage for enterprises.

2.1 Intelligent Production

Our facility has completed the upgrade of its automated production line for prestressed steel wire. From the selection of high-carbon wire rod raw materials and multi-pass precision drawing, to the tension-stabilization heat treatment conducted at 380°C, each stage is controlled by automated equipment, and the data is fully traceable. We maintain product dimensional accuracy within ±0.01 mm and limit fluctuations in mechanical properties within 3%. This ensures the consistency of our products and the quality can be tested by third-party institutions.

2.2 Intelligent Quality Inspection

Leveraging automated inspection equipment and Manufacturing Execution System (MES), we conduct comprehensive inspections including the appearance, dimensions, and mechanical properties of all products. Our low-relaxation prestressing steel wire outperforms standard national requirements, exhibiting a 1,000-hour relaxation rate of ≤1.5%. This effectively resolves the issues of unstable relaxation performance and significant differences in service life of traditional products, providing a long-term guarantee for the safe operation of engineering projects.

III. Comprehensive Implementation of Green Manufacturing

Guided by "Dual Carbon" policies and the main trend toward raw material selection in engineering projects, low-carbon production capacity and ultra-low emission credentials have become significant factors in engineering bidding project; consequently, green manufacturing has emerged as a defining trend.

We continuously optimize the eco-friendly processes in our manufacturing—such as acid pickling and phosphating, heat treatment—and have successfully completed ultra-low emission upgrades across our production line. Through equipment iteration and process optimization, the overall energy consumption of our production line has been reduced by 9.5%, and carbon emissions have been cut by 15.3%, thus we earning comprehensive certification for green manufacturing.

Our intelligent, eco-friendly production lines can support high-end prestressed steel wire of ultra-high strength, low relaxation, and corrosion resistance. In addition, they fully meet the requirements of green building and low-carbon material selection, and can be widely applied to various projects, including wind power generation devices, Bridges and railway sleepers, etc.

Summary

At present, the prestressed steel wire industry is in a critical period of transformation with triple upgrades in standards, processes and production capacity: national standards are becoming increasingly strict, intelligent production is being fully popularized, and green manufacturing has become an essential need for the industry. The entire market has officially entered a high-quality development stage centered on high quality, high stability and high compliance.

As a professional manufacturer, our factory strictly adheres to the latest national standard GB/T 5223-2025 throughout the entire production line. We can supply all specifications of common type, low relaxation type and anti-corrosion special prestressed steel wire ranging from 1570MPa to 2360MPa.

Our factory has sufficient raw material in stock, stable product quotations, and our products have long been serving key projects such as Bridges, high-speed rail sleepers, wind power new energy, municipal infrastructure, and nuclear power supporting facilities. Welcome to visit our factory for on-site inspection and sample purchase,and hope we can establish a long-term and stable cooperative relationship!