Technical conditions for plates of P355NL2
1. Scope
The technical conditions apply to plates of P355NL2 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
|
Alt
|
Cr
|
Cu
|
Mo
|
Nb
|
Ni
|
|
Max 0.18
|
Max 0.50
|
1.10- 1.70
|
Max 0.025
|
Max 0.015
|
Min 0.02
|
Max 0.30
|
Max 0.30
|
Max 0.08
|
Max 0.05
|
Max 0.50
|
3.2 Carbon equivalent (CEq)
Carbon equivalent shall be not more than 0.45 for plates of P355NL2.
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 P355NL2 shall meet the requirement as table 2.
Table 2 Tensile properties
|
Thickness mm
|
Yield strength MPa
|
Tensile strength MPa
|
-50C Akv (J)
|
Elongation %
|
|
8-60
|
Min 355
|
490-630
|
Min 27J
|
Min 22
|
|
60-100
|
Min 355
|
490-630
|
Min 27J
|
Min 21
|
|
100-150
|
Min 315
|
470-610
|
Min 27J
|
Min 21
|
|
150-250
|
Min 295
|
450-590
|
Min 27J
|
Min 21
|
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 -50C
|
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 P355NL2 shall be witnessed by surveyor of GL.
6. Delivery conditions
The delivery conditions for plates of P355NL2 shall be Normalized.
7. Other requirements
The other requirements for plates of P355NL2 shall be accordance with EN10028-3.
MTC accordance with EN10204 3.1