Technical conditions for plates of SA516Gr70 Used For Nuclear Island Reactor
1. Scope
The technical conditions apply to plates of SA516Gr70 Used For Nuclear Island Reactor support part and liftinglug and etc with thickness range 8mm-100mm.
2. Adopt standard:
ASME SA516/SA516M-10 Standard Specification for Pressure Vessel Plates, Carbon Steel, for Moderate- and Lower-Temperature Service
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.
4. Technical conditions
4.1 Chemical composition
The chemical composition of plates shall be accordance with the following table 1.
Table 1 Chemical composition
Grade | Type | C | Si | Mn | P | S | Cu |
SA516Gr70 | Ladle analysis | Max 0.25 | 0.15- 0.40 | 0.85- 1.20 | Max 0.015 | Max 0.005 | Max 0.15 |
Product analysis | Max 0.25 | 0.13- 0.45 | 0.79- 1.30 | Max 0.018 | Max 0.005 | Max 0.15 |
4.2 Steel making process: EAF+LF/VD
4.3 Tensile properties
The SWHT properties of SA516Gr70 shall meet the requirement as table 2&3.
Table 2 Tensile properties
Thickness mm | Yield strength MPa | Tensile strength MPa | Elongation % |
Max 20mm | Min 260 | 485-620 | Min 21 |
Over 20mm | Min 260 | 485-620 | Min 21 |
4.4 Impact properties
Impact test in the longitudinal and transverse for plates of SA516Gr70 shall meet the requirements per table 3.
Table 3 Impact properties
Transverse test at 0℃ | |
Average side-swell value | Average impact energy |
Min 0.38mm Single Min 0.25mm | Min 27J Single Min 20J |
4.5 Hardness: Max 22HRC
4.6 SWHT rules:
SWHT Temperature | operation |
Under 315℃ | Charging |
More then 315℃ | Heating rate: Max 55℃/h |
608+/-13℃ | Holding 24 hours |
More then 315℃ | Cooling rate: Max 55℃/h |
Under 315℃ | Air cooling to room temperature |
4.7 Surface quality
The surface quality of plates shall be accordance with ASTM A20/A20M.
4.8 Ultrasonic inspection
Plates shall be ultrasonic inspected per ASTM A578/A578M level A.
4.9 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 | ASTM A751 | / |
Tensile test | 1 (per rolled pc) | ASTM A20/A20M | ASTM A370 | SWHT |
Charpy-V impact test at 0C | 3 (per rolled pc) | ASTM A20/A20M | ASTM A370 | |
Hardness | 1 (per rolled pc) | GB/T2975 | GB/T 230.1 | |
Ultrasonic test | Each product pc | ASTM A578/A578M | ||
5. Package, marking and certificate
Package, marking and certificate shall conform to SA20/SA20M.
6. The third party inspection
The chemical composition, tensile test and Charpy -V impact test and HIC test for plates of SA516Gr70 shall be witnessed by surveyor of clients.
7. Delivery conditions
The delivery conditions for plates of SA516Gr70 shall be Normalized.
8. Other requirements
The other requirements for plates of SA516Gr70 shall be accordance with SA516/SA516M-2010.
MTC accordance with EN10204: 2004 3.1
