Lembaran Keluli Lembut Gelek Panas
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, termasuk 304, 316, dan 2205, offer enhanced corrosion resistance and durability, making them suitable for demanding environments such as chemical processing and marine applications.
- Penerangan
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, pinggan, dan gegelung.
Ciri-ciri utama:
- Scaled, rough surface finish
- Excellent formability and ductility
- Kebolehkimpalan yang baik
- 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, DALAM, and GB.
Typical Grade Comparison Table
| Gred | Standard | Kekuatan Hasil (MPa) | Kekuatan Tegangan (MPa) | Pemanjangan (%) |
|---|---|---|---|---|
| A36 | ASTM | ≥250 | 400–550 | 20–23 |
| S235 | DALAM 10025 | ≥235 | 340–470 | ≥26 |
| S275 | DALAM 10025 | ≥275 | 430–580 | ≥22 |
| S355 | DALAM 10025 | ≥355 | 470–630 | ≥22 |
| Q235 | GB/T 700 | ≥235 | 370–500 | 20–25 |
| Q345 | GB/T 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%): Kekuatan yang lebih tinggi, lower ductility
- High carbon steel (>0.6%): Kekerasan yang tinggi, 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, gerudi, dan kimpalan
- Suitable for heavy fabrication and structural components
- Efficient for mass production
Ciri-ciri Permukaan
- 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
Aplikasi Biasa
- Structural frames and supports
- Bahan binaan
- Komponen jentera
- 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
Keluli Tahan Karat Austenit
- 304: General-purpose, rintangan kakisan yang sangat baik
- 316: Improved corrosion resistance with molybdenum, suitable for marine and chemical environments
- 321: Stabilized for high-temperature applications
Keluli Tahan Karat Feritik
- 430: Magnet, rintangan kakisan sederhana
- 409: Rintangan haba yang baik, commonly used in exhaust systems
Keluli Tahan Karat Dupleks
- 2205: High strength combined with excellent corrosion resistance
Industrial Performance of Stainless Steel
Sifat Mekanikal
- Good strength and ductility
- High impact resistance
- Suitable for both structural and precision applications
Rintangan Kakisan
- 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
Aplikasi
- Peralatan pemprosesan kimia
- Marine and offshore structures
- Jentera pemprosesan makanan
- Oil and gas industry
- Architectural and industrial systems
Mild Steel vs Stainless Steel (Digulung Panas)
| Harta benda | Mild Steel Sheet | Lembaran Keluli Tahan Karat |
|---|---|---|
| Komposisi | Karbon rendah | Alloyed with chromium, nikel |
| Rintangan Kakisan | rendah | tinggi |
| kekuatan | Sederhana | Moderate to high |
| Kebolehkimpalan | Cemerlang | Cemerlang |
| Kemasan Permukaan | Kasar, scaled | Scaled (can be pickled) |
| Aplikasi | Structural and industrial | Corrosive and high-performance environments |
