Products Description
SMA400BW is a low-alloy, high-strength weathering steel plate conforming to JIS G3114, specifically designed for long-term outdoor structural applications with excellent atmospheric corrosion resistance.
Unlike ordinary carbon steel, SMA400BW gradually forms a dense oxide layer approximately 50–100 μm thick under natural exposure. This protective layer effectively slows further corrosion, providing a service life of 20–30 years in urban or industrial environments, and over 25 years in coastal or high-humidity conditions.
In addition to corrosion resistance, this steel plate exhibits excellent mechanical properties, with a yield strength of 400 MPa, a tensile strength ranging from 490 to 610 MPa, and an elongation of at least 22%, maintaining good toughness even in low-temperature conditions.
Its chemical composition, with controlled amounts of copper, nickel, and chromium, ensures both structural strength and excellent weldability, allowing it to be used outdoors without additional coatings.
Thanks to its combination of high strength, long-term durability, and low maintenance requirements, SMA400BW is widely used in railway carriages, air preheaters, economizers, bridge structures, container manufacturing, and other structural components exposed to the atmosphere, making it a reliable choice for engineering and construction projects.
Mechanical property for SMA400BW steel plate
| Thickness (mm) | ||||||
| SMA400BW | ≤ 16 | > 16 ≤ 40 | > 40 ≤ 75 | > 75 ≤ 100 | > 100 ≤ 160 | > 160 |
| Yield strength (≥Mpa) | 245 | 235 | 215 | 215 | 205 | 195 |
| Tensile strength (Mpa) | 400-540 | |||||
Chemical composition for SMA400BW steel plate (Ladle Analysis Max%)
| Main chemical elements composition of SMA400BW corten plate | |||||||
| C | Si | Mn | P | S | Cu | Cr | Ni |
| 0.18 | 0.15-0.65 | 1.25 | 0.035 | 0.035 | 0.30-0.50 | 0.45-0.75 | 0.05-0.30 |
Products Application
Due to its high strength and excellent atmospheric corrosion resistance, SMA400BW is widely used in various outdoor structural applications. In the railway industry, it is commonly used for railway carriage components and vehicle underframes, providing reliable load-bearing performance while resisting rain, wind, and humidity.
In the energy and industrial sectors, SMA400BW is applied to air preheaters, economizers, and industrial pipeline structures, where its corrosion resistance ensures long-term stable operation. In bridge and construction projects, it is used for main beams, supporting structures, and deck panels. Even in coastal or high-humidity environments, it can maintain a service life of over 25 years, reducing maintenance and coating requirements.
SMA400BW is also widely used in container manufacturing and large outdoor equipment structures, where the naturally formed dense oxide layer not only extends the material's service life but also provides an attractive reddish-brown patina.
Overall, SMA400BW is ideal for any long-term outdoor structural applications requiring a combination of high strength, corrosion resistance, and low maintenance, making it a preferred weathering steel for construction machinery, transportation, bridges, and landscape architecture.
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