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Pressure purposes-Nickel alloy steel X8Ni9

Category: Pressure Vessel Steel Plate
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Technical conditions for plates of X8Ni9
 
1.       Scope
The technical conditions apply to plates of X8Ni9 with thickness not more than 50mm. (8mm-50mm)
2.       Adopt standard:
BS EN10028-4 Flat products made of steels for pressure purposes-Nickel alloy steels with specified low temperature properties.
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
Mo
V
Ni
Max 0.10
Max 0.35
0.30- 0.80
Max 0.012
Max 0.004
Min 0.02
Max 0.10
Max 0.05
8.5- 10.0
Note: Ni+Cu+Mo =<0.50%
 
4.2   Mechanical properties
The mechanical properties of X8Ni9 shall meet the requirement as table 2.
Table 2 Tensile properties
Thickness mm
Yield strength MPa
Tensile strength MPa
-196 C Akv (J)
Transverse
Elongation %
Bend test
180C
8-30
Min 575
680-820
Min 80J
Min 18
d=3a
31-50
Min 565
680-820
Min 80J
Min 18
d=3a
 
4.3   Surface quality
The surface quality of plates shall be accordance with EN10163-2.
4.4   Ultrasonic inspection
Plates shall be ultrasonic inspected per EN10160-1999 S2E2.
4.5   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)
EN10028-4
EN10028-4
2
Tensile test
1 (Rolled pc)
EN10028-1
EN10028-1
3
Impact test at -196C
3 (Rolled pc)
EN10028-1
EN10028-1
4
Thickness tension
3 (Rolled pc)
EN10164
EN10164
5
Product analysis
1 (Product pc)
EN10028-1
EN10028-1
6
Ultrasonic test
Each product pc
EN10160
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 X8Ni9 shall be witnessed by surveyor of client.
7.       Delivery conditions
The delivery conditions for plates of X8Ni9 shall be Quenching+ Tempered.
8.       Other requirements
The other requirements for plates of X8Ni9 shall be accordance with EN10028-4.
MTC accordance with EN10204 3.1
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