Technical conditions for plates of SA203GrE
1. Scope
2. Adopt standard:
ASME SA203/SA203M Standard Specification for Pressure Vessel Plates, Alloy Steel, Nickel ASME SA20/SA20M Standard Specification for General Requirements for Steel Plates for Pressure Vessels
ASME SA370 Standard Test Methods and Definitions for Mechanical Testing of Steel Products
3. Dimension, Shape, Weight and Permissible Deviation
The dimension, shape, weight and permissible deviation shall meet the requirements of ASME SA20/SA20M.
The thickness toleration: -0 mm/+3.5mm
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)
|
Thickness
mm
|
C
|
Si
|
Mn
|
P
|
S
|
Ni
|
Mo
|
V
|
|
Ladle analysis
|
Max 0.10
|
0.15- 0.35
|
0.38- 0.80
|
Max 0.012
|
Max 0.005
|
3.25- 3.70
|
Max 0.12
|
Max 0.05
|
4.2 Steel making process: EAF+LF/VD
4.3 Mechanical properties
The mechanical properties of SA203GrE shall meet the requirement as table 2&3.
Table 2 Tensile properties
|
Thickness mm
|
Yield strength MPa
|
Tensile strength MPa
|
Elongation %
|
Bend test
D=3a
|
|
8-60
|
Min 320
|
490-620
|
Min 21
|
180C un-cracked
|
|
61-100
|
Min 300
|
480-610
|
Min 21
|
180C un-cracked
|
4.4 Impact properties
Impact test in the longitudinal and transverse for plates of SA203GrE shall meet the requirements per table 3.
Table 3 Impact properties
|
Charpy-V Impact
Test temp.
Celsius degree
|
Transverse
|
|
|
Average impact energy
|
||
|
-101 C
|
Min 47J
|
|
4.5 SWHT: Simulated Post-Weld Heat Treatment of Mechanical Test Coupons shall be prepared in 590+/-20 C with min.5 minute per each mm of thickness.
4.6 Surface quality
The surface quality of plates shall be accordance with ASTM A20/A20M.
4.7 Ultrasonic inspection
Plates shall be ultrasonic inspected per ASTM A578/A578M level C.
4.8 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
|
Test item
|
Quantity, Piece
|
Sampling method
|
Test method
|
Sampling conditions
|
|
Ladle analysis
|
1 (per furnace)
|
ASTM A20/A20M
|
ASME SA751
|
/
|
|
Tensile test
|
1 (per heat treatment pc)
|
ASTM A20/A20M
|
ASME SA370
|
SWHT
|
|
Charpy-V impact test at -101C
|
3 (per heat treatment pc)
|
ASTM A20/A20M
|
ASME SA370
|
|
|
Ultrasonic test
|
Each product pc
|
ASTM A578/A578M
|
N, N+T, Q+T
|
|
5. Package, marking and certificate
Package, marking and certificate shall conform to A20.
6. The third party inspection
The chemical composition, tensile test and Charpy V impact test for plates of SA203GrE shall be witnessed by surveyor of client.
7. Delivery conditions
The delivery conditions for plates of SA203GrE shall be Normalized or N+T or Q+T; Tempering TEMP no less than 600 Celsius degree.
8. Other requirements
The other requirements for plates of SA203GrE shall be accordance with SA203/SA203M-2010.
MTC accordance with EN10204: 2004 3.1