St37 Carbon Structural Steel (DIN Standard)

St37 is a widely used non-alloy carbon structural steel specified under the German DIN (Deutsches Institut für Normung) standards. It is valued for its excellent weldability, formability, and cost-effectiveness, making it a staple in general structural and fabrication applications. Below is a detailed breakdown:

1. DIN Standards & Classification

St37 is primarily defined in the historical DIN standard DIN 17100 (now superseded by the European EN 10025 series, but still referenced in many industries). Within DIN 17100, St37 is classified based on its form and processing:

 

St37-2: The most common variant, referring to hot-rolled steel with improved toughness (notch impact testing at room temperature).

St37-3U: A variant with better impact resistance, tested at 0°C ("U" indicates "unnotched" or enhanced toughness).

St37-4: Used for cold-formed parts, with stricter controls on mechanical properties.

 

 

 

 

 

 

2. Chemical Composition

St37 is a low-carbon steel, with its chemistry tightly controlled to ensure workability:

 

Carbon (C): ≤ 0.20% (low carbon content ensures good weldability and ductility).

Manganese (Mn): 0.30–0.60% (improves strength and hot workability).

Silicon (Si): ≤ 0.30% (aids deoxidation during production).

Phosphorus (P): ≤ 0.045% (harmful impurity, limited to avoid brittleness).

Sulfur (S): ≤ 0.045% (controlled to prevent hot cracking during welding/rolling).

Iron (Fe): Balanced (the remaining composition).

 

 

 

 

 

 

 

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