Technical conditions for plates of P275NH
1. Scope
The technical conditions apply to plates of P275NH with thickness not more than 250mm. (8mm-250mm)
2. Dimension, Shape, Weight and Permissible Deviation
The dimension, shape, weight and permissible deviation shall meet the requirements of EN10029.
3. Technical conditions
3.1 Chemical composition (Ladle analysis)
The chemical composition of plates shall be accordance with the following table 1.
Table 1 Chemical composition (Ladle analysis)
|
C
|
Si
|
Mn
|
P
|
S
|
Cr
|
Cu
|
Mo
|
Nb
|
V
|
|
Max 0.16
|
Max 0.40
|
0.80- 1.50
|
Max 0.025
|
Max 0.015
|
Max 0.30
|
Max 0.30
|
Max 0.08
|
Max 0.05
|
Max 0.05
|
3.2 Carbon equivalent (CEq)
Carbon equivalent shall be not more than 0.42 for plates of P275NH.
Carbon equivalent shall be calculated as follows:
CEq=C+Mn/6+(Cr+Mo+V)/5+(Ni+Cu)/15 (%)
3.3 Mechanical properties
The mechanical properties of P275NH shall meet the requirement as table 2.
Table 2 Tensile properties
|
Thickness mm
|
Yield strength MPa
|
Tensile strength MPa
|
-20C Akv (J)
|
Elongation %
|
|
8-60
|
Min 275
|
390-510
|
Min 30J
|
Min 24
|
|
60-100
|
Min 255
|
390-510
|
Min 30J
|
Min 24
|
|
100-150
|
Min 255
|
390-510
|
Min 30J
|
Min 24
|
|
150-250
|
Min 235
|
370-490
|
Min 30J
|
Min 24
|
3.4 Surface quality
The surface quality of plates shall be accordance with EN10163-2.
3.5 Ultrasonic inspection
Plates shall be ultrasonic inspected per EN10160-1999 S2E2.
3.6 Test method and inspection rules
Test items, sampling quantity, sampling method and test method shall conform to table 4.
Table 4 Test items for plates
|
No.
|
Test item
|
Quantity, Piece
|
Sampling method
|
Test method
|
|
1
|
Chemical composition (Ladle analysis)
|
1 (per batch furnace number)
|
EN10028-3
|
EN10028-3
|
|
2
|
Tensile test
|
1 (Rolled pc)
|
EN10028-1
|
EN10028-1
|
|
3
|
Impact test at -20C
|
1 (Rolled pc)
|
EN10028-1
|
EN10028-1
|
|
4
|
Thickness tension
|
3 (Rolled pc)
|
EN10164
|
EN10164
|
4. Package, marking and certificate
Package, marking and certificate shall conform to EN10028-1.
5. The third party inspection
The chemical composition, tensile test and Charpy -V impact test for plates of P275NH shall be witnessed by surveyor of GL.
6. Delivery conditions
The delivery conditions for plates of P275NH shall be Normalized.
7. Other requirements
The other requirements for plates of P275NH shall be accordance with EN10028-3.
MTC accordance with EN10204 3.1