It should be noted that St12, St13, and St14 belong to cold-rolled low-carbon steel grades in the DIN EN 10130 standard, which are not low alloy high strength steels. These grades are characterized by low carbon content and excellent formability, making them suitable for deep drawing and cold forming. Below is a detailed introduction:

1. Grade Classification and Core Properties

These grades fall under the EN 10130:2006 standard (cold-rolled low-carbon steel sheets and strips for cold forming), categorized by formability (from low to high):

 

St12: General cold forming quality.

St13: Better formability (improved ductility).

St14: Deep drawing quality (excellent ductility and surface finish).

 

Grade	Yield Strength (Rp0.2, MPa)	Tensile Strength (Rm, MPa)	Elongation (A80, %) ≥	Carbon Content (%) ≤	Typical Application
St12	140–280	270–410	26	0.10	Simple cold-formed parts
St13	130–260	270–390	28	0.08	Moderate deep drawing
St14	120–240	270–370	30	0.06	Complex deep drawing (e.g., car bodies)

 

Key Features:

 

Low Carbon: ≤0.10% carbon ensures softness and ductility, ideal for cold working.

Low Alloy Content: Primarily composed of Fe, C, Mn, Si with minimal alloying elements (not classified as low alloy steel).

Surface Quality: High-precision cold rolling provides smooth surfaces for painting or plating.

 

 

 

 

 

 

 

 

 

 

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