熱間圧延軟鋼板
Hot rolled mild steel sheet is widely used due to its cost efficiency, excellent workability, and reliable mechanical performance. Common grades such as A36, S235, and Q235 are ideal for structural and general industrial use.
Hot rolled stainless steel sheets, 含む 304, 316, そして 2205, offer enhanced corrosion resistance and durability, making them suitable for demanding environments such as chemical processing and marine applications.
- 説明
Hot rolled mild steel sheet is produced by rolling steel at high temperatures, typically above 900°C. At this temperature, the steel becomes more ductile and can be easily formed into sheets, プレート, とコイル.
主な特徴:
- Scaled, rough surface finish
- Excellent formability and ductility
- 良好な溶接性
- Lower production cost compared to cold rolled steel
- Wider dimensional tolerances
It is widely used in structural and industrial applications where surface finish is not critical.
Common Grades of Hot Rolled Mild Steel Sheet
Hot rolled mild steel grades are defined by international standards such as ASTM, で, and GB.
Typical Grade Comparison Table
| 学年 | 標準 | 降伏強さ (MPa) | 抗張力 (MPa) | 伸長 (%) |
|---|---|---|---|---|
| A36 | ASTM | ≥250 | 400–550 | 20–23 |
| S235 | で 10025 | ≥235 | 340–470 | ≥26 |
| S275 | で 10025 | ≥275 | 430–580 | ≥22 |
| S355 | で 10025 | ≥355 | 470–630 | ≥22 |
| Q235 | ギガバイト/トン 700 | ≥235 | 370–500 | 20–25 |
| Q345 | ギガバイト/トン 700 | ≥345 | 470–630 | 20–22 |
| 1018 | AISI/SAE | 310–420 | 380–540 | ≥28 |
Grade Characteristics
- Low carbon steel (≤0.25%): Excellent forming and welding performance
- Medium carbon steel (0.25–0.6%): より高い強度, lower ductility
- High carbon steel (>0.6%): 高硬度, limited formability
Industrial Properties of Hot Rolled Mild Steel
Mechanical Performance
- Moderate strength with good toughness
- High ductility suitable for bending and forming
- Stable mechanical properties for large-scale applications
Fabrication Advantages
- Easy to cut, drill, そして溶接する
- Suitable for heavy fabrication and structural components
- Efficient for mass production
表面特性
- Oxide scale formed during hot rolling
- Not suitable for decorative applications without further processing
- Can be pickled or coated for improved appearance and corrosion resistance
代表的な用途
- Structural frames and supports
- 建設資材
- 機械部品
- Automotive structures
- Storage tanks and pipelines
Hot Rolled Stainless Steel Sheet – Grades and Industrial Performance
In industrial applications, hot rolled mild steel is often compared with hot rolled stainless steel due to differences in corrosion resistance and alloy composition.
Common Hot Rolled Stainless Steel Grades
オーステナイト系ステンレス鋼
- 304: 汎用, 優れた耐食性
- 316: Improved corrosion resistance with molybdenum, suitable for marine and chemical environments
- 321: Stabilized for high-temperature applications
フェライト系ステンレス鋼
- 430: 磁気, 適度な耐食性
- 409: Good heat resistance, commonly used in exhaust systems
二相ステンレス鋼
- 2205: High strength combined with excellent corrosion resistance
Industrial Performance of Stainless Steel
機械的性質
- Good strength and ductility
- High impact resistance
- Suitable for both structural and precision applications
耐食性
- Chromium content forms a protective oxide layer
- Superior resistance to oxidation and chemical exposure
- 316 and duplex grades perform well in chloride environments
Processing Characteristics
- Surface scale after hot rolling
- Requires pickling or descaling for improved corrosion performance
- Good weldability with proper procedures
アプリケーション
- 化学処理装置
- Marine and offshore structures
- 食品加工機械
- Oil and gas industry
- Architectural and industrial systems
Mild Steel vs Stainless Steel (熱間圧延)
| 財産 | Mild Steel Sheet | ステンレス鋼板 |
|---|---|---|
| 構成 | 低炭素 | Alloyed with chromium, ニッケル |
| 耐食性 | 低い | 高い |
| 強さ | 適度 | Moderate to high |
| 溶接性 | 素晴らしい | 素晴らしい |
| 表面仕上げ | 粗い, スケーリングされた | Scaled (漬けることができます) |
| アプリケーション | 構造的および産業的 | 腐食性および高性能環境 |
