Technical conditions for plates of SA387Gr22CL2 used for nuclear power plant

Technical conditions for plates of SA387Gr22CL2 used for nuclear power plant

1.    Scope
The technical conditions apply to plates of SA387Gr22CL2 used for nuclear power plant, equivalent to MPS-GDFT-CPR1000-Gr22-PL specification.
2.    Adopt standard:
ASME SA387/SA387M Specification for pressure vessel plates, alloy steel, Chromium-Molybdenum
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/+2.5mm
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
Grade    Type    C    Si    Mn    P    S    Mo
SA387Gr22CL2    Ladle analysis    0.05- 0.15    Max 0.50    0.30- 0.60    Max 0.025    Max 0.010    0.87- 1.13
    Product analysis    0.05- 0.15    Max 0.50    0.30- 0.60    Max 0.025    Max 0.015    0.87- 1.13


4.2    Steel making process: EAF+LF/VD
4.3    Mechanical properties
The mechanical properties of SA387Gr22CL2 shall meet the requirement as table 2&3.
Table 2 Tensile properties
Thickness mm    Yield strength MPa    Tensile strength MPa    Elongation %    High temp. 350C tensile test
8-120    Min 310    515-690    Min 18    Rp0.2>=185MPa

4.4    Impact properties
Impact test in the longitudinal and transverse for plates of SA387Gr22CL2 shall meet the requirements per table 3.
Table 3 Impact properties
Grade    Sampling size    Room temp. Transverse Akv(J)
SA387Gr22CL2    10x10x55    Min 45
    7.5x10x55    Min 39
    5x10x55    Min 30


4.5    SWHT: Simulated Post-Weld Heat Treatment of Mechanical Test Coupons shall be prepared in 600+/-10 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 B.
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 SA370    /
Tensile test    1 (per rolled pc)    ASTM A20/A20M    ASME SA370    SWHT
Charpy-V impact test at -20C    3 (per rolled pc)    ASTM A20/A20M    ASME SA370    
Hardness    1 (per rolled pc)    GB/T2975    GB/T 230.1    
Product analysis    1 (per rolled pc)    ASTM A20/A20M    ASME SA370    +N
Ultrasonic test    Each product pc    ASTM A578/A578M    
HIC test    See 5.HIC    NACE TM0284    NACE TM0284    SWHT

5.    HIC sampling method: Per heat number/ thickness/ heat treatment rules combine one group.
6.    Package, marking and certificate
Package, marking and certificate shall conform to A20.
7.    The third party inspection
The chemical composition, tensile test and Charpy -V impact test for plates of SA387Gr22CL2 shall be witnessed by surveyor of clients.
8.    Delivery conditions
The delivery conditions for plates of SA387Gr22CL2 shall be Normalized+ Tempered.
9.    Other requirements
The other requirements for plates of SA387Gr22CL2 shall be accordance with SA387/SA387M-2010.
MTC accordance with EN10204: 2004 3.1
More technical details and the MTC require please contact us.