Chemical Composition( %):
|
Grade/ Material |
Element |
Composition( Max-A, Min-I) |
|
DIN EN 10028-2 P265GH |
C |
A:0.20 |
|
Mn |
A:0.80-1.40 |
|
|
Si |
A:0.40 |
|
|
P |
A:0.025 |
|
|
S |
A:0.015 |
Mechanical Properties( Mpa)
|
Grade/ Material |
Tensile Test |
MPa |
|
DIN EN 10028-2 P265GH |
Tensile Strength |
410-530 |
|
Yield Strength |
I:265 |
|
|
Elongation |
I:22% |
|
|
Impact Test( if any) |
-- |
1. What is the key difference between P265GH and P235GH grades?
Answer: The main differences are:
Higher minimum yield strength: 265 MPa vs 235 MPa (hence the naming)
Slightly higher carbon/manganese content (C≤0.20% vs ≤0.16%, Mn≤1.40% vs ≤1.20%)
Better temperature resistance: P265GH maintains strength up to 400°C vs 350°C for P235GH
Thicker applications: Commonly used for sections up to 120mm vs 60mm for P235GH
2. What are the mandatory impact test requirements for P265GH?
Answer: Standard requirements include:
Minimum impact energy: 27J at 0°C (for thicknesses >30mm)
Optional lower temperatures: Available down to -50°C with specified impact values
Testing frequency: One set per 40 tons or heat (whichever is smaller)
Test orientation: Transverse specimens required for thickness >30mm
3. How does P265GH compare to ASTM/ASME equivalents?
Answer: Close equivalents include:
| Property | P265GH | ASME SA-516 Gr 65 | ASTM A285 Gr C |
|---|---|---|---|
| Yield (MPa) | 265 | 240 | 205 |
| Tensile (MPa) | 410-530 | 450-585 | 380-515 |
| CEV (max) | 0.43 | 0.45 | 0.48 |
| Main use | EU pressure vessels | US pressure vessels | Small tanks |
4. What are the permitted heat treatment options for P265GH?
Answer: Three production routes:
Normalized (N): Required for thickness >30mm
Normalized rolled (NR): For improved toughness
As-rolled (AR): Only permitted for thickness ≤30mm
Note: Normalization temperature typically 890-950°C followed by air cooling
5. What special considerations apply when welding P265GH?
Answer: Critical welding factors:
Preheat: 50-100°C recommended for thickness >25mm
Consumables: EN ISO 2560-A E46 or E42 electrodes
Heat input: Limit to 2.5kJ/mm for optimal properties
PWHT: Required when thickness exceeds 35mm (580-620°C)
CEV calculation: Use IIW formula (C+Mn/6+(Cr+Mo+V)/5+(Ni+Cu)/15)
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