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, assiettes, and coils.

Caractéristiques clés:

• Scaled, rough surface finish
• Excellent formability and ductility
• Bonne soudabilité
• 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, DANS, and GB.

Typical Grade Comparison Table

Grade Characteristics

• Low carbon steel (≤0.25%): Excellent forming and welding performance
• Medium carbon steel (0.25–0.6%): Résistance supérieure, lower ductility
• High carbon steel (>0.6%): High hardness, 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, and weld
• Suitable for heavy fabrication and structural components
• Efficient for mass production

Caractéristiques des surfaces

• 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

Applications typiques

• Structural frames and supports
• Construction materials
• Composants de machines
• 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

Acier inoxydable austénitique

• 304: Usage général, excellente résistance à la corrosion
• 316: Improved corrosion resistance with molybdenum, suitable for marine and chemical environments
• 321: Stabilized for high-temperature applications

Acier inoxydable ferritique

• 430: Magnétique, résistance modérée à la corrosion
• 409: Good heat resistance, commonly used in exhaust systems

Acier inoxydable duplex

• 2205: High strength combined with excellent corrosion resistance

Industrial Performance of Stainless Steel

Propriétés mécaniques

• Good strength and ductility
• High impact resistance
• Suitable for both structural and precision applications

Résistance à la corrosion

• 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

Applications

• Équipement de traitement chimique
• Structures marines et offshore
• Machines de transformation des aliments
• Oil and gas industry
• Architectural and industrial systems

Acier doux vs acier inoxydable (Laminé à chaud)