ST52-3 steel, produced under DIN17100 standard. St52-3 steel is regarded as unalloy structural steel . St52-3 is equivalent to S355 of European standard, and Material number of German standard: 1.0570. It is mainly used in civil construction, underground engineering, bridge, ocean engineering and automobile and machinery manufacturing.

DIN 17100 STEELS FOR GENERAL STRUCTURAL PURPOSES (DIN17100)

1. Scope

1.1 This Standard applies to steel sections (including wide flange beams), steel bars, wire rod, flat products(strip, plate, wide flats) seamless and welded, square and rectangular hollow sections, forgings and semi-finished products in the general structural steels nemed in Tables 1 to 3 which are delivered in the hot formed or normalized condition after production.

1.2 products from steels according to this Standard are for use in welded (but see Section 834.2), riveted and screwed structural components, They are not intended for heat treatment - apart from stress-relieving heat treatment and normalizing.

1.3 This Standard does not cover the following products from steels for general structural purposes :

Seamless and welded tubes and precision steel tubes, see standards below mentioned
DIN 1626 Part 1 to Part 4,
DIN 1629 Part 1 to part4,
DIN 2391 Part2, DIN 2393 part 2,
DIN 2394, DIN 2395 Part 2, DIN 2395 part3).
DIN2391 Part 1. Description: Tube, steel tube, precision tube,Seamless precision steel hollow tube, dimensions.

DIN2391 Part 2. Description: Seamless Precision Steel tubes, technical delivery conditions

Steel castings(See DIN 1681).
Cold rolled flat products without coating (see DIN 1623 Part2, new version in preparation).

Flat steel products with coatings(DIN Standards in preparation).

Bright finished steel (see DN 1652).

Cold rolled sections (see DIN 17118).

Cold finished steel hollow sections (DIN Standards in preparation).