S355J2G3 low carbon Manganese steel

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S355J2/S355J2+N/S355J2G3, ST52-3, SM490

What type of steel is S355?

S355J2 steel is a carbon manganese ,high yield non alloy steel. It is called S355 because of the average minimum yield for this material is 355Mpa. As a structural steel, it has excellent strength and weldability. It can be readily welded to other weldable steel. For its low carbon equivalent, it possesses good cold-forming properties. S355J2 is generally supplied in a normalized condition.


S355j2 Chemical Composition & Related Specifications

Grade C Si Mn P S
S355J2G3 ≤ 0.22 ≤0.55 ≤1.6 ≤ 0.035 ≤ 0.035


Germany UK China Japan
ST52-3 / 1.0570 En14A / 150M19 16Mn SM 490


S355 specifications

Grade symbol
S355 JR Charpy impact tests at room temperature 20°C
J0 Charpy impact tests at 0°C
J2 Charpy impact tests at -20°C
S355J2 N Supply condition normalised
G3 Supply condition normalised

Mechanical Property

Thickness ,mm 5-100 100-150
Tensile strength,Mpa 470-630 450-650
Thickness ,mm ≤ 16 16-40 40-63 63-80 80-100 100-150 150-200 200-350 > 250
Yield strength,Mpa ≥ 355 ≥ 345 ≥ 335 ≥ 325 ≥ 315 ≥ 295 ≥ 285 ≥ 275 ≥ 265
Thickness ,mm 5-40 40-63 63-100 100-150
Elongation,% ≥20 ≥19 ≥18 ≥18
Impact,J J2: 27J at – 20°C


Normalizing of Carbon steel S355J2

Normalizing is used to refine the structure of forgings that might have cooled non-uniformly after forged and considered as a conditioning treatment before final heat treatment. Normalizing temperature for S355J2 steel should be carried out between 890℃-950℃. hold suitable time for the steel to be thoroughly heated to complete the ferrite to austenite transformation. Cool in still air.

Application of S355 Carbon steel

S355J2 is a low carbon structural steel grade often used for application which require better mechanical properties than that of S275 and S235 grade. It is widely used in engineering and construction industries.

What does J2G3 mean?
Besides S355J2G3 grade, there are other grades in EN10025 such as S355J2G4, S355J2, S355J0 etc. For Grade S355J2G3, J2G3 means that the delivery status is normalized, the impact energy at -20 °C is 27J, and G3 is the means of characterizing the deoxidation method.
What is the yield strength of steel?
Yield strength is the maximum stress that can be applied before it begins to change shape permanently. This is an approximation of the elastic limit of the steel. If stress is added to the metal but does not reach the yield point, it will return to its original shape after the stress is removed.