Analysis of St52-3 and S275JR Hot-Rolled Low-Alloy High-Strength Steel Plates

1. Standards and Grade Systems

Historical Standard (St52-3)

 

Originates from the German DIN standard (e.g., DIN 17100), classified as low-alloy high-strength structural steel, later replaced by the European EN standard.

Naming Rule:

St: Stahl (German for "steel").

52: Approximate tensile strength of 520 MPa (actual range: 490–630 MPa).

-3: Indicates room-temperature impact resistance (non-EN standard system, interpretation requires reference to specific standards).

 

 

 

 

 

 

 

Mechanical Properties Comparison (Thickness ≤16mm)

Grade	Standard	Yield Strength (MPa)	Tensile Strength (MPa)	Elongation (%)	Impact Performance	Typical Application Scenarios
St52-3	Old DIN standard	≥355 (low-alloy)	490–630	≥22	Room-temperature impact (non-EN)	Bridges, heavy machinery, pressure vessels
S275JR	EN 10025-2	≥275 (carbon steel)	410–560	≥23	20℃ impact energy ≥27J	General steel structures, non-cold regions

 

 

 

Core Characteristics

St52-3 (Low-Alloy High-Strength Steel)

 

High Strength: Yield strength ≥355 MPa, suitable for heavy-load structures.

Good Toughness: Although not strictly a low-temperature steel, it has better room-temperature impact resistance and can be used in non-extremely cold regions.

Weldability: Low carbon equivalent (CEV ≈0.4%), generally no preheating required, suitable for welding large structures.

Workability: Cold formable (e.g., bending, punching) in hot-rolled state, but deformation must be controlled to avoid cracking.

 

S275JR (High-Yield Carbon Steel)

 

Economical: Lower cost than low-alloy steel, suitable for scenarios with moderate strength requirements.

Wide Applicability: Balanced mechanical properties at room temperature, commonly used in building frames, mechanical components, etc.

Limitations: Impact resistance only applicable at room temperature (20℃), prone to brittle fracture in low-temperature environments, and lower strength than low-alloy grades.

 

 

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