- 説明
Corten sheet metal is a type of weathering steel sheet designed for outdoor use. It forms a dense protective rust layer after exposure to natural weather, which helps reduce further corrosion. This material is commonly used in construction, 造園, transportation, and industrial structures because it combines structural strength with natural corrosion resistance.
Corten sheet metal is often supplied under standards such as:
- ASTM A606 タイプ 4
- ASTM A588
- で 10025 S355J2W
- Q355NH
It is generally available in thicknesses from 0.8 mm to 6 mm for sheet products, while thicker materials are classified as corten steel plate.
Main Properties of Corten Sheet Metal
The key advantage of corten sheet metal is its ability to form a stable oxide patina. 通常の炭素鋼とは異なります, the rust layer on corten is compact and adherent, slowing down corrosion inside the steel.
Typical Chemical Composition
| 要素 | 代表的な内容 (%) | 関数 |
|---|---|---|
| 炭素 (C) | 0.10–0.20 | Basic strength |
| 銅 (銅) | 0.25–0.40 | 耐食性の向上 |
| クロム (Cr) | 0.40–0.65 | Enhances patina formation |
| ニッケル (で) | 0.30–0.65 | Increases weather resistance |
| リン (P) | ≤0.15 | Helps stabilize rust layer |
| マンガン (ん) | 0.80–1.25 | 靭性の向上 |
These alloying elements make corten different from common mild steel, although it is still classified as low-alloy carbon steel.
機械的性質
| 財産 | 代表値 |
|---|---|
| 降伏強さ | ≥ 345 MPa |
| 抗張力 | 485–630MPa |
| 伸長 | ≥ 20% |
| 硬度 | 130–190HB |
| 密度 | 7.85 g/cm³ |
Corten sheet offers good strength and outdoor durability, but it is not intended for high-wear conditions.
Corten Sheet Metal vs Abrasion Resistant Steel
Corten steel and abrasion resistant steel are often compared because both are used in harsh environments. Their design purposes are different.
| 財産 | コルテンシートメタル | 耐摩耗鋼 |
|---|---|---|
| Main feature | Weather resistance | 耐摩耗性 |
| 硬度 | 130–190HB | 360–600 HB |
| 表面 | 保護錆層 | Usually painted |
| Main alloy | 銅, Cr, で | C, ん, B |
| Best application | 屋外構造物 | Heavy wear equipment |
| 機械加工 | Easier | More difficult |
| 溶接性 | 良い | 適度 |
Main Difference
Corten sheet metal resists atmospheric corrosion, while abrasion resistant steel resists mechanical wear and impact.
例:
- Corten sheet is suitable for façade panels, ガーデンスクリーン, and containers.
- Abrasion resistant steel is suitable for dump truck liners, 破砕機, and mining chutes.
This means corten performs better in rainy outdoor conditions, while wear plate performs better in environments with sand, 砂利, or constant friction.
Why Corten Is Still Carbon Steel
Many inspection reports classify corten as carbon steel. This is normal because corten is a low-alloy carbon steel, not stainless steel.
Its base material is still iron and carbon, but alloying elements improve weather resistance. このため:
- It can rust naturally
- It can be welded like structural steel
- It is magnetic
- It has better outdoor durability than standard carbon steel
The protective rust layer is the major difference between corten and ordinary carbon steel.
Common Applications of Corten Sheet Metal
Corten sheet metal is widely used in:
- Architectural wall cladding
- Outdoor decorative panels
- 庭の縁取り
- Landscape retaining walls
- Railway vehicles
- 輸送用コンテナ
- 彫刻
- Bridge components
Its natural rust finish makes it popular for projects where appearance and durability are both important.
