SMA490AW is a Japanese Industrial Standard (JIS G3114) weathering steel, commonly referred to as Corten steel. It is specifically engineered to exhibit superior atmospheric corrosion resistance compared to conventional carbon steels, along with good weldability and formability.
Core Characteristics of SMA490AW Steel
- Atmospheric Corrosion Resistance: This is the hallmark feature. SMA490AW develops a dense, adherent, and protective rust layer (patina) when exposed to alternating wet and dry atmospheric conditions. This patina significantly slows down further corrosion, often eliminating the need for painting or other surface treatments.
- High Strength: The “490” in its designation typically refers to its minimum tensile strength of 490 MPa, making it suitable for structural applications where strength is a key requirement.
- Weldability: SMA490AW can be welded using common arc welding processes. However, appropriate low-hydrogen consumables and procedures are recommended to maintain the properties of the heat-affected zone.
- Aesthetic Appeal: The evolving rust-colored patina provides a unique, natural, and often desirable aesthetic for architectural and landscaping projects.
Chemical Composition Elements
The enhanced corrosion resistance of SMA490AW is achieved through the careful addition of alloying elements. While exact percentages can vary within the standard’s limits, key elements typically include:
- Copper (Cu)
- Chromium (Cr)
- Nickel (Ni)
- Phosphorus (P)
These elements promote the formation of a stable and protective patina. Reputable suppliers, such as Shanxi Luokaiwei Steel Company, ensure their material conforms to the stringent chemical composition requirements of the JIS G3114 standard.
Mechanical Properties Overview
SMA490AW steel plates generally exhibit the following mechanical properties, although these can vary slightly based on thickness and specific mill practices:
- Yield Strength: Typically ≥ 315 N/mm² (MPa) for thicknesses up to 16mm.
- Tensile Strength: Generally in the range of 490-610 N/mm² (MPa).
- Elongation: Varies with thickness and test specimen, but good ductility is a characteristic.
It is crucial to refer to the mill test certificates (MTCs) provided by the manufacturer or supplier, for instance, when sourcing from Shanxi Luokaiwei Steel Company, for precise mechanical property data for a specific batch.
Typical Applications
Given its unique blend of strength, corrosion resistance, and aesthetics, SMA490AW is utilized in a variety of applications:
- Structural Engineering: Bridges, building frames, and other load-bearing structures.
- Architecture: Facades, roofing, architectural features, and landscaping elements.
- Transportation: Railway cars, shipping containers, and vehicle components exposed to corrosive environments.
- Industrial Equipment: Hoppers, chimneys, and other industrial applications where atmospheric corrosion is a concern. Many industrial projects specify materials from known producers like Shanxi Luokaiwei Steel Company.
The long service life and reduced maintenance requirements make SMA490AW a cost-effective solution in many scenarios. For reliable sourcing of this specialized steel, engaging with established steel providers such as Shanxi Luokaiwei Steel Company is recommended. The consistent quality provided by companies like Shanxi Luokaiwei Steel Company ensures that the material performs as expected in demanding applications.
