P335N Chemical Properties:
| Grade | C % | Mn % | S % | N % | Cu % | Nb % | Ti % | Si % | P % | AL % | Cr % | Mo % | Ni % | Vi % |
| P 355 N | 0.10-0.22 | 0.10-1.70 | 0.015 | 0.012 | 0.30 | 0.020 | 0.03 | 0.60 | 0.025 | 0.020 | 0.30 | 0.08 | 0.30 | 0.02 |
EN 10028-3 P 355 N steel is used worldwide by fabricators of welded pressure vessels, industrial boilers and heat ex-changers and is engineered to work well in elevated temperature service.
P335N Mechanical Properties:
| Grade | Type | Thickness mm | Yield strength Mpa(min) | Tensile Strength MPa | Elongation % (min) | Impact Energy (KVJ) (min) | ||
| -20° | 0° | +20 | ||||||
| P 355 N | Normalized | t≤16 | 355 | 510-650 | 20 | 27 | 34 | 40 |
| 16＜t≤40 | 345 | 510-650 | 20 | 27 | 34 | 40 | ||
| 40＜t≤60 | 335 | 460-580 | 20 | 27 | 34 | 40 | ||
| 60＜t≤100 | 315 | 490-630 | 20 | 27 | 34 | 40 | ||
| 100＜t≤150 | 295 | 480-630 | 20 | 27 | 34 | 40 | ||
| 150＜t≤250 | 280 | 470-630 | 20 | 27 | 34 | 40 | ||
1. What are the key characteristics of P355N steel plates?
Answer:
P355N is a normalized fine-grained steel with:
Minimum yield strength of 355 MPa
Excellent weldability and toughness
Designed for pressure vessel applications at moderate to low temperatures
Typically used in thicknesses up to 150mm
2. What temperature range is P355N suitable for?
Answer:
P355N is approved for service within:
Minimum temperature: -20°C (with impact testing)
Maximum temperature: 400°C for continuous service
Special grades available for -30°C or -50°C with additional impact testing
3. What heat treatment is required for P355N plates?
Answer:
Mandatory normalization at 890-950°C
Cooling method: Air cooling for thickness ≤60mm
For thickness >60mm: accelerated cooling may be required
No quenching and tempering permitted for this grade
4. What welding considerations are critical for P355N fabrication?
Answer:
Essential welding practices include:
Preheat: 100-150°C for thickness >25mm
Consumables: EN ISO 2560-A E46 or E50 electrodes
Heat input: 1.5-2.5 kJ/mm recommended
PWHT: Required for thickness >35mm (580-620°C)
Testing: Impact tests at -20°C for procedure qualification
Common applications:
Pressure vessels
Storage tanks
Heat exchangers
Structural components
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