Yuantai Derun Group: Leading Manufacturer of Zinc-Aluminium-Magnesium Steel in China
Leading Manufacturer of Zinc-Aluminum-Magnesium Steel in China
Yuantai Derun Group is a leading brands in China’s square and rectangular steel pipe industry ,proudly listed among the Top 500 manufacturing enterprises in China. As a key participant in the national square and rectangular tube standard-setting committee, Yuantai Derun has a long-standing commitment to innovation and product development, with the objective of achieving the company’s “second curve” of sustainable growth.
In 2023, the Yuantai Derun-Tangshan production base commenced operations, boasting an annual capacity of 5 million tons. Zinc-Aluminum-Magnesium (ZAM) steel coils and ZAM steel pipes are the newly developed products, which represent a new generation of high -performance anti-corrosion materials.
About Zinc-Aluminum-Magnesium Steel
The Zinc-Aluminum-Magnesium (ZAM) coil is manufactured through a series of sophisticated processes, including hot rolling, pickling, cold rolling, and coating. Its unique coating composition includes zinc (Zn), aluminum (Al), and magnesium (Mg), which work together to provide exceptional surface protection.
Compared with conventional hot-dip galvanized steel, ZAM steel products provide enhanced corrosion resistance, increased edge protection, and a longer service life. In corrosion tests, In corrosion tests, ZAM materials have demonstrated surface corrosion resistance that is over twice that of conventional galvanized coatings. Furthermore, the corrosion resistance of these materials after forming has been shown to improve by 2 to 5 times, depending on the forming method and environment.
Neutral Salt Spray Test (NSS Test) for Zinc-Aluminum-Magnesium Steel Products
The Neutral Salt Spray (NSS) test is a widely used accelerated corrosion testing method that has been applied in numerous industries for decades. The product is able to simulate long-term environmental corrosion under controlled laboratory conditions. The test employs a 5% sodium chloride (NaCl) solution which is characterized by neutral pH range of 6–7 as the spray medium. The test temperature is maintained at 35°C, and the salt fog deposition rate is controlled between 1–2 ml/80 cm² per hour.
A common equivalence for corrosion resistance is:
A 24 hours of NSS test ≈ 1 year of natural environmental exposure
Please find blow a comparison of test results. Let us examine the test together!
Group 1: Steel Coils
Baosteel Zinc-Aluminum-Magnesium (ZAM) Coil vs. Hot-Dip Galvanized (HDG) Coil
Hot-Dip Galvanized (HDG) Coil Zinc-Aluminum-Magnesium (ZAM) Coil
The above shows the results after 168 hours of the Neutral Salt Spray (NSS) test.
Group 2: Steel Pipes
Yuantai Zinc-Aluminum-Magnesium (ZAM) Pipe vs. Pre Galvanized Steel Pipe
Galvanized Strip Pipe Zinc-Aluminum-Magnesium pipe
The following essay will provide a detailed analysis of conventionally galvanized square and rectangular pipes.
Conventional Galvanized Square & Rectangular Pipes
Surface Rating: Grade 1
Defect Area Ratio: 35%–45%
Appearance Level: I (cracking observed)
Observation: The samples exhibited signs of corrosion of the base metal, indicating that under neutral salt spray conditions, the samples’ protection was limited.
Yuantai ZAM (Zinc-Aluminum-Magnesium) Pipes：
Surface Rating: Grade 8
Defect Area Ratio: 0.15%–0.2%
Appearance Level: B (minimal darkening resulting from coating corrosion)
Observation: The samples exhibit only slight discoloration, which is indicative of excellent corrosion resistance and durable surface integrity.
Pre Galvanized Steel Pipe Zinc-Aluminum-Magnesium pipe
The above shows the results after 240 hours of the Neutral Salt Spray (NSS) test.
Pre Galvanized Steel Pipe Zinc-Aluminum-Magnesium pipe
The above shows the results after 480 hours of the Neutral Salt Spray (NSS) test.
The Advantages of Yuantai Derun ’s Zinc-Aluminum-Magnesium Products
1.Exceptional corrosion resistance – Demonstrates durability even in the hardest environments.
2.Excellent formability –ensures the coating remains strong and protective after bending, welding, or other fabrication processes.
3.High adhesion and coating stability – ensure a flawless surface finish, thereby extending the product's service life.
4.Environmentally friendly and cost-effective – reducing extending replacement cycles, making it a wise choice for sustainable applications.
