Technical specifications and application area of JIS G3124
The JIS G3124 standard regulates the production of high-strength steel plates designed for the manufacture of boiler equipment and pressure vessels operating under excess pressure. A key feature of this rolled product is the strictly standardized yield strength (or 0.2% proof stress) in the temperature range from normal conditions up to 400 °C. The material possesses excellent weldability characteristics, which is critical for critical welded structures. EV Group China supplies a wide range of these steels, ensuring compliance with all industrial standard requirements.
The range of nominal thicknesses for plate products is presented in the table below:
| Steel Grade | Thickness, mm |
|---|---|
| SEV 245 | from 6 to 150 inclusive |
| SEV 295 | from 6 to 150 inclusive |
| SEV 345 | from 6 to 150 inclusive |
The chemical composition of the steels determines their high operational reliability and processability during heat treatment:
| Steel | C | Si | Mn | P | S | Cu | Mo | Nb | V |
|---|---|---|---|---|---|---|---|---|---|
| SEV 245 | <0.20 | 0.15-0.60 | 0.80-1.60 | <0.030 | <0.030 | <0.40 | <0.35 | <0.05 | 0.10 |
| SEV 295 | <0.19 | 0.15-0.60 | 0.80-1.60 | <0.030 | <0.030 | <0.70 | 0.10-0.40 | <0.05 | 0.10 |
| SEV 345 | <0.19 | 0.15-0.60 | 0.80-1.60 | <0.030 | <0.030 | <0.70 | 0.15-0.50 | <0.05 | 0.10 |
Mechanical properties and strength parameters
EV Group China products undergo strict quality control, ensuring that mechanical characteristics meet the requirements of the JIS G3124 standard to ensure the safety of pressure vessel operations.
| Steel | Thickness, mm | Yield Strength, N/mm2, min. | Tensile Strength, N/mm2 | Elongation, %, min. |
|---|---|---|---|---|
| SEV 245 | up to 50 inclusive | 370 | 510-650 | 16 |
| from 50 to 100 inclusive | 355 | 510-650 | 20 | |
| from 100 to 125 inclusive | 345 | 500-640 | 20 | |
| from 125 to 150 inclusive | 335 | 490-630 | 20 | |
| SEV 295 | up to 50 inclusive | 420 | 540-690 | 15 |
| from 50 to 100 inclusive | 400 | 540-690 | 19 | |
| from 100 to 125 inclusive | 390 | 530-680 | 19 | |
| from 125 to 150 inclusive | 380 | 520-670 | 19 | |
| SEV 345 | up to 50 inclusive | 430 | 590-740 | 14 |
| from 50 to 100 inclusive | 430 | 590-740 | 18 | |
| from 100 to 125 inclusive | 420 | 580-730 | 18 | |
| from 125 to 150 inclusive | 410 | 570-720 | 18 |