Chemical Composition( %):
|
Grade/ Material |
Element |
Composition( Max-A, Min-I) |
|
DIN EN 10028-5 P460ML2 |
C |
A:0.16 |
|
Mn |
A:1.70 |
|
|
Si |
A:0.60 |
|
|
P |
A:0.020 |
|
|
S |
A:0.015 |
Mechanical Properties( Mpa)
|
Grade/ Material |
Tensile Test |
MPa |
|
DIN EN 10028-5 P460ML2 |
Tensile Strength |
530-720 |
|
Yield Strength |
I:460 |
|
|
Elongation |
I:17% |
|
|
Impact Test( if any) |
-50℃ |
1. How does the TMCP process differ for P460ML2 production?
Answer:
The thermomechanical controlled processing features:
Higher finish rolling temperature (800-880°C vs 750-850°C)
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
2. What welding parameters are recommended?
Answer:
Qualified Welding Procedure:
Preheat: 150-200°C (for t>20mm)
Consumables: EN ISO 16834-A G 55 5 M21 3Ni1Mo
Heat Input: 1.8-3.0 kJ/mm
Interpass Temp: 150-220°C
PWHT: 600-620°C × 1hr/25mm (t>40mm)
Testing: Impact at -40°C
Critical Notes:
• Root passes require TIG welding
• Hydrogen control (<5ml/100g deposit)
• Hardness surveys mandatory (max 350HV10)
3. When should engineers specify P460ML2?
Answer:
Ideal for:
✔ Refrigerated storage (-40°C)
✔ Chemical process vessels
✔ Cost-sensitive cryogenic projects
✔ Thickness range 20-80mm
Not recommended for:
✖ LNG primary containment (-162°C)
✖ Sour service (H2S environments)
✖ Thick sections (>100mm) requiring Z-direction properties
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