EN10028-5 P355ML2 For Pressure Vessel Plate

Chemical Composition and Mechanical Properties:

1. What is the primary application advantage of P355ML2 over P355ML1?

Answer:
P355ML2 provides a cost-optimized solution for moderate cryogenic service with:

-40°C impact toughness (vs -60°C for P355ML1)

Relaxed composition limits (S≤0.008% vs 0.006%)

15-20% lower cost while maintaining key performance

Reduced testing requirements for non-critical applications

Better availability in standard thicknesses (≤80mm)

2. How does the TMCP process differ for P355ML2 production?

Answer:
The thermomechanical controlled processing features:

Higher finish rolling temp (800-880°C vs 750-850°C for ML1)

Slower cooling rates (5-15°C/s vs 10-30°C/s)

Reduced microalloying (Nb≤0.04% vs 0.05%)

Optional tempering for thickness >60mm
Resulting in 20% faster production cycles

3. What welding parameters ensure optimal joint performance?

Answer:
Qualified Welding Procedure:

Preheat: 100-150°C (monitored with Tempil sticks)

Consumables: EN ISO 16834-A G 42 4 M21 2Ni

Heat Input Range: 1.8-3.5 kJ/mm (wider than ML1)

Interpass Temp: 150-220°C (infrared controlled)

PWHT: Only required when t>40mm (580-620°C×1h)

Critical Notes:
• No post-weld normalization permitted
• Root passes must use TIG process for critical joints
• Impact test coupons must represent HAZ worst-case

4. When should engineers specify P355ML2 vs P355ML1?

Answer:
Choose P355ML2 when:
✔ Design temps ≥-40°C (process chillers, refrigerated storage)
✔ Budget constraints exist (large volume projects)
✔ Delivery time is critical (standard stock availability)
✔ Non-sour service applications (HIC testing not required)

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