BLOG

Home page

What Standard Defines High‑Strength Steel for Expressway Guardrails?

Release time:

2026-04-12

This article interprets the professional explanation about the official standards of high‑strength steel used in expressway guardrails. It covers key mechanical indexes including yield strength, tensile strength, elongation after fracture and yield ratio, and clarifies the applicable conditions of high‑strength steel guardrails on 120 km/h expressways.

Traffic guardrail knowledge

What is high-strength steel? High-strength means a yield strength of 700Mpa and a tensile strength of 750Mpa, that is, the tensile strength reaches 750Mpa, and the elongation after fracture reaches ±20%.

The national standard for elongation after fracture in the production process of high-strength steel is 12%. Since high-strength steel guardrails have the performance and function of protecting against impact and ensuring safety on expressways, their elongation after fracture should be higher.

In the process of domestic use and R&D of high-strength steel, the most difficult thing to achieve is the elongation after fracture. In fact, since we started developing this product in 2018, the hardest thing to reach and achieve has been this index. There is also the yield ratio, which is relatively easier to control.

Now we can completely achieve the yield ratio between 18-20. However, only the guardrail plates pressed from 3mm thick steel plates by those recognized steel mills can be fully used on expressways with a design speed of 120km/h. Only such guardrail plates can be called high-strength steel guardrails.

Latest News

Hot-Dip Galvanizing for Coastal Solar Projects: 85μm vs 65μm—Which Lasts Longer in Typhoon Climates?

Many solar mounting systems fail prematurely in coastal regions due to insufficient galvanizing thickness. Learn the real difference between 85μm and 65μm zinc coatings for PV mounting structures in typhoon-prone environments. Beifang Group provides ASTM A123-compliant solar brackets engineered for Southeast Asia and Middle East projects.

2026-06-02

Saudi Vision 2030 Road Safety: How to Pass SASO Certification for Imported Guardrails

Learn how imported highway guardrails can meet Saudi SASO certification requirements under Vision 2030 infrastructure projects. Shandong Beifang Group supplies hot-dip galvanized guardrails with MTC reports, ISO certification, and export experience for Middle East highway contractors.

2026-05-28

Sourcing Highway Guardrails from China: A Procurement Guide for Philippine DPWH Contractors

Shandong Beifang Group（Tomex）manufactures galvanized and powder-coated highway guardrails for Philippine DPWH contractors. Equipped with 7 hot-dip galvanizing lines, 10 guardrail roll-forming lines, and annual production capacity of 1.5 million tons. Export-ready with ASTM, AASHTO, and customized engineering support for tropical environments.

2026-05-22

Solar Mounting Solutions for Tropical & Desert Climates: How Beifang Group's PV Brackets Withstand Typhoons, Sandstorms & Salt Air

Shandong Beifang Group (Tomex) manufactures hot-dip galvanized PV mounting brackets engineered for Southeast Asia and Middle East climates. ISO 9001 certified, ≥85μm zinc coating, customizable for 60m/s wind loads. Project references in Philippines and Saudi Arabia. Get free engineering consultation.

2026-05-13

How to Choose the Right Carbon Steel for Guardrails & Solar Mounting Structures

Shandong Beifang Group（Tomex） supplies galvanized steel materials for highway guardrails and solar mounting structures. Learn how carbon steel hardness, zinc coating, and material grades affect service life, corrosion resistance, and project cost in tropical, coastal, and desert environments. ISO-certified manufacturer with customized engineering support.

2026-05-08

Highway Guardrail Installation Process Explained | Precision Engineering by Shandong GuanXian BeiFang Group

This article introduces the complete highway guardrail installation process developed by Shandong GuanXian BeiFang Group, covering every step from site survey to final inspection. It highlights how professional engineering, strict quality control, and global standards ensure durable road safety systems.

2026-04-29