Plat Keluli Terluluhawa
Weathered steel plate is a type of corrosion-resistant structural steel that develops a protective rust layer when exposed to the atmosphere. This property is why it is called keluli luluhawa.
Gred biasa seperti A588, A242, A606, SPA-H, and S355J2W digunakan secara meluas dalam jambatan, seni bina, struktur landskap, dan pembinaan luar, offering long service life with reduced maintenance requirements.
- Penerangan
Weathered steel plate, juga dikenali sebagai plat keluli luluhawa, is a type of low-alloy structural steel designed to resist atmospheric corrosion. The material forms a lapisan pelindung seperti karat yang stabil on its surface when exposed to the environment. This layer protects the internal steel from further corrosion and gives the material its distinctive brown appearance.
Because of this property, weathering steel is widely used in jambatan, seni bina, reka bentuk landskap, dan aplikasi struktur luar.
Why It Is Called Weathering Steel
Weathering steel is named for its ability to resist the effects of weather exposure. When ordinary carbon steel is exposed to rain and air, rust continues to grow and eventually weakens the structure.
Weathering steel behaves differently:
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Protective Patina Formation
The steel forms a dense oxide layer (patina) on the surface after exposure to rain and oxygen. -
Reduced Corrosion Rate
This patina slows down further corrosion and protects the underlying metal. -
Long-Term Durability
Once the protective layer stabilizes, the corrosion rate becomes much lower than that of ordinary steel.
This natural process allows weathering steel to perform well outdoors without frequent painting or coatings.
Common Grades of Weathering Steel Plates
Weathering steel plates are produced under several international standards. Each grade has slightly different chemical compositions and mechanical properties.
| Gred keluli | Standard | Aplikasi Biasa |
|---|---|---|
| A588 | ASTM | Jambatan, heavy structural components |
| A242 | ASTM | Structural plates and architectural panels |
| A606 | ASTM | Cadar nipis, roofing and cladding |
| SPA-H | DIA | Panel seni bina, struktur landskap |
| S355J2W | DALAM | Structural steel for buildings and bridges |
These grades all contain alloying elements that improve corrosion resistance.
Key Alloying Elements in Weathering Steel
Weathering steel contains specific alloy elements that help create the protective patina.
| unsur | Fungsi |
|---|---|
| Tembaga (Cu) | Promotes formation of protective rust layer |
| Chromium (Cr) | Meningkatkan ketahanan kakisan |
| nikel (Dalam) | Meningkatkan ketahanan cuaca |
| silikon (Dan) | Meningkatkan rintangan pengoksidaan |
| Fosforus (P) | Helps stabilize the rust layer |
The combination of these elements allows the steel surface to form a padat, lapisan oksida yang stabil that slows corrosion.
Common Applications of Weathered Steel Plates
Weathered steel plates are widely used in projects exposed to outdoor conditions.
Pembinaan Jambatan
Weathering steel plates are used for galang jambatan, rasuk, and structural supports because they reduce maintenance requirements.
Pelapisan Senibina
The natural rust color makes weathering steel popular for fasad bangunan, exterior wall panels, and decorative structures.
Landskap dan Reka Bentuk Bandar
Weathered steel plates are commonly used for:
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Tepi taman
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Parut pokok
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Arca luar
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Dinding penahan landskap
Industrial Structures
Keluli luluhawa juga digunakan dalam kereta api, bekas, and outdoor industrial equipment.
