1.DIN17100 is a German steel standard, which includes many different types of steel materials.
2.SF440A (SF45A)
This is a carbon steel forging product, which belongs to the category of alloy steel. In terms of its chemical composition, the carbon (C) content is below 0.6, the silicon (Si) content is between 0.15 - 0.5, the manganese (Mn) content is between 0.3 - 1.2, and the phosphorus (P) and sulfur (S) contents are below 0.03 and 0.035 respectively1.
3.St52 steel
Grade and corresponding relationship: St52 steel is a non-alloy structural steel grade that complies with DIN17100:1980. Since 2004, this name has been abandoned and there is a new corresponding name. For example, the new name of St52-3 is S355J2 (1.0577), the new name of St52-3U is S355J0 (1.0553), and the new name of St52-3N in EN5525:1993 is S355J2G3, and DIN17100 is also replaced by EN10025-2:2004.
4.stg.50.2
DIN17100 stg.50.2 is a non-alloy engineering steel, and the corresponding grade in China GB is Q275Z.
5. Material use
These steels that meet the DIN17100 standard have different characteristics and are widely used. Non-alloy structural steels such as St52 steel are often used in the manufacture of general structural parts, such as building structures and some frame structures in machinery manufacturing; while carbon steel forgings such as SF440A (SF45A) may be more used in the forging of mechanical parts that have certain requirements for strength and toughness.
