アイシ 442
AISI 442 is a high-chromium ferritic stainless steel designed for high-temperature oxidation resistance and thermal stability. Its elevated chromium content provides better corrosion and heat resistance than standard ferritic grades such as 430 ステンレス鋼.
- 説明
AISI 442 is a ferritic stainless steel grade known for its excellent oxidation resistance, high chromium content, and good high-temperature performance. Compared with common ferritic stainless steels such as 430 ステンレス鋼, AISI 442 contains a much higher chromium content, giving it superior corrosion resistance and heat resistance in oxidizing environments.
This material is commonly used in furnace parts, 熱処理装置, industrial exhaust systems, and high-temperature structural components.
1. Chemical Composition of AISI 442 ステンレス鋼
AISI 442 is a high-chromium ferritic stainless steel.
代表的な化学組成
| 要素 | 代表的な内容 |
|---|---|
| クロム (Cr) | 18.0% – 23.0% |
| 炭素 (C) | ≤ 0.20% |
| マンガン (ん) | ≤ 1.00% |
| シリコン (そして) | ≤ 1.00% |
| リン (P) | ≤ 0.04% |
| 硫黄 (S) | ≤ 0.03% |
| ニッケル (で) | Low or trace |
The high chromium content is the key factor responsible for the material’s oxidation and corrosion resistance.
2. 主な性能特性
優れた耐酸化性
AISI 442 performs very well in high-temperature oxidizing environments due to its high chromium level.
優れた耐食性
The material provides better resistance to oxidation and scaling than standard ferritic grades such as 430 ステンレス鋼.
Ferritic Stainless Steel Structure
As a ferritic stainless steel:
- 磁性体
- Lower thermal expansion than austenitic grades
- Good thermal conductivity
- ニッケル含有量の低減
High-Temperature Stability
AISI 442 maintains good surface stability at elevated temperatures.
3. 機械的性質
| 財産 | Typical Performance |
|---|---|
| 構造 | フェライト |
| 磁気 | 磁気 |
| 耐熱性 | 素晴らしい |
| 耐酸化性 | 非常に高い |
| 耐食性 | 良い |
| 溶接性 | 適度 |
| 成形性 | 適度 |
Compared with austenitic stainless steels, ferritic grades generally have:
- Lower ductility
- Lower weldability
- Better thermal fatigue resistance
4. AISI 442 対 430 ステンレス鋼
| 財産 | AISI 442 | 430 ステンレス鋼 |
|---|---|---|
| Chromium Content | より高い | より低い |
| 耐酸化性 | より良い | 良い |
| 耐熱性 | 優れた | 適度 |
| 耐食性 | より良い | 汎用 |
| 料金 | より高い | より低い |
| High-Temperature Use | 素晴らしい | 限定 |
Because of its higher chromium content, AISI 442 is more suitable for elevated temperature service.
5. Heat Resistance Performance
AISI 442 is often selected for applications involving:
- Continuous high-temperature exposure
- Oxidizing furnace environments
- Thermal cycling conditions
Advantages include:
- Reduced scaling
- Stable oxide layer formation
- Improved thermal oxidation resistance
6. Processing Characteristics
形にする
- Suitable for moderate forming operations
- Lower ductility than 304 ステンレス鋼
溶接
- Welding is possible with controlled procedures
- Preheating and post-weld considerations may be required for thicker sections
機械加工
- Moderate machinability
- Better thermal conductivity than austenitic grades
7. Common Applications of AISI 442 ステンレス鋼
AISI 442 で広く使用されています:
- 炉のコンポーネント
- Heat treatment equipment
- Industrial exhaust systems
- 燃焼室
- 高温ダクト
- 熱処理装置
- Automotive heat-resistant parts
8. Advantages of AISI 442 ステンレス鋼
- High chromium content
- Excellent oxidation resistance
- Good heat resistance
- Magnetic ferritic structure
- Lower nickel content compared with austenitic stainless steels
- Good thermal stability at elevated temperatures
