Technical conditions for plates of P355GH

1.    Scope
The technical conditions apply to plates of P355GH with thickness not more than 250mm. (8mm-250mm) used for Harbin Boiler produce CFB boiler.
2.    Adopt standard:
EN10028-2: 2003 Flat products made of steels for pressure purposes Part 2: Non-alloy and alloy steels with specified elevated temperature properties
EN10163-2:2004 Delivery requirements for surface condition of hot-rolled steel plates, wide flats and sections - Part 2: Plate and wide flats Class B.
3.    Dimension, Shape, Weight and Permissible Deviation
The dimension, shape, weight and permissible deviation shall meet the requirements of EN10029.
4.    Technical conditions
4.1    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    Ti    V    N
0.10- 0.22    Max 0.60    1.10- 1.70    Max 0.025    Max 0.015    Min 0.020    Max 0.30    Max 0.30    Max 0.08    Max 0.020    Max 0.030    Max 0.020    Max 0.012

4.2    Carbon equivalent (CEq)
Carbon equivalent shall be not more than 0.43 for plates of P355GH.
Carbon equivalent shall be calculated as follows:
CEq=C+Mn/6+(Cr+Mo+V)/5+(Ni+Cu)/15 (%)
4.3    Mechanical properties
The mechanical properties of P355GH shall meet the requirement as table 2.
Table 2 Tensile properties
Thickness mm    Yield strength MPa    Tensile strength MPa    0C Akv (J)    Elongation %
8-60    Min 355    490-630    Min 34J    Min 22
60-100    Min 355    490-630    Min 34J    Min 21
100-150    Min 315    470-610    Min 34J    Min 21
150-250    Min 295    450-590    Min 34J    Min 21

4.4    SWHT: The optimized SWHT technology is as follows: heating at 610℃+/-10℃ for 7h, then followed by cooling in furnace to 400℃, then for air cooling.
4.5    Minimum values for the proof strength Rp0.2 at elevated temperatures shall meet the requirements per table 4.





Table 4 High temp Tensile properties
Test TEMP    Thickness mm    320℃    350℃    370℃
Rp0.2
Min (MPa)    8-40    225    214    209
    41-100    218    208    203
    101-250    212    202    197

4.6    Ultrasonic inspection
Plates shall be ultrasonic inspected per EN10160-1999 S2E2.
4.7    Test method and inspection rules
Test items, sampling quantity, sampling method and test method shall conform to table 5.
Table 5 Test items for plates
No.    Test item    Quantity, Piece    Sampling method    Test method
1    Chemical composition (Ladle analysis)    1 (per batch furnace number)    EN10028-2    EN10028-2
2    Tensile test    1 (Rolled pc)    EN10028-1    EN10028-1
3    Impact test at 0C    1 (Rolled pc)    EN10028-1    EN10028-1
4    High temperature tensile test    3 (Rolled pc)    EN10164    EN10164
5    Bend test    1 (Rolled pc)    EN10028-1    EN10028-1
6    UT    1 (Product pc)        EN10160

5.    Package, marking and certificate
Package, marking and certificate shall conform to EN10028-1.
6.    The third party inspection
The chemical composition, tensile test and Charpy -V impact test for plates of P355GH shall be witnessed by surveyor of TUV.
7.    Delivery conditions
The delivery conditions for plates of P355GH shall be Normalized, Temperature range 890-950℃.
8.    Other requirements
The other requirements for plates of P355GH shall be accordance with EN10028-2.
MTC accordance with EN10204 3.2

More technical details and the MTC require please contact us.