S235JR+N grade steel refers to S235JR steel products supplied in the normalized state, i.e. after heating to a suitable temperature, annealing and quiet cooling in air. Through this operation, the steel acquires a fine-grained structure, leading to improved mechanical properties. This operation is used especially for unalloyed structural steels, which can then be hot-formed or further heat-treated.
S235JR+N steel chemical composition
A very important factor determining the mechanical properties of a given steel is its chemical composition. According to melt analysis, the chemical composition of S235JR+N steel should be in accordance with the values given in the table below.
| Designation | C in % max. for a product with nominal thickness in mm | Mn % max. | P % max. | S % max. | N % max. | Cu % max. | |||
|---|---|---|---|---|---|---|---|---|---|
| Steel mark | No. of steel | ≤ 16 | >16 ≤ 40 | >40 | |||||
| S235JR | 1.0038 | 0,17 | 0,17 | 0,20 | 1,4 | 0,035 | 0,035 | 0,012 | 0,55 |
Steel S235JR+N mechanical properties
| Steel | Mechanical properties | ||||
|---|---|---|---|---|---|
| Steel mark | Rp0.2 [MPa] | Rm [MPa] | HB | Elongation [%] | Impact strength |
| S235JR | 175-235 | 360 - 510 | 100 - 154 | 21-26 | 27 J (20°C) |
S235JR+N steel application
S235JR steel is a grade very often used for building structures, it is well weldable and resistant to brittle fracture. It is usually supplied in hot-rolled condition and can be used in a wide variety of structures, such as bridges, machinery and as a material for structural components designed for strength, as well as for structures for overhead line conductors.
S235JR vs S355J2 comparison
When comparing S235JR steel with another equally popular structural steel, S355J2, the first thing to note is that they differ in yield strength, i.e. 235 MPa or 355 MPa. A higher value of the stress required to initiate macroscopic plastic deformation is exhibited by S355J2 steel, and in connection with this it also shows higher strength, i.e. Rm ranges from 470 to 630 MPa. Another difference has been determined by the type designation JR and J2 and stands for impact strength i.e. the material's resistance to fracture under dynamic loading.
JR - impact strength of 27 J at 20℃
J2 - impact strength of 60 J at -20℃
| Steel | Mechanical properties | |||
|---|---|---|---|---|
| Steel mark | Rp0.2 [MPa] | Rm [MPa] | HB | Impact strength |
| S235JR | 235 | 360 - 510 | 100 - 154 | 27 J (20°C) |
| S355J2 | 355 | 470 - 630 | 146 - 187 | 60J (-20°C) |
Go back to steel grades homepage
Go back