Technical conditions for plates of NVE690
1. Scope
The technical conditions apply to plates of NVE690 with thickness not less than 80mm. (80mm-300mm)
2. Dimension, Shape, Weight and Permissible Deviation
The dimension, shape, weight and permissible deviation shall meet the requirements of DNV-OS-B101.
Thickness tolerance: -0~+3.0mm
Length tolerance: -0~+50mm
3. Technical conditions
3.1 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 | Cr | Ni | Mo | Cu | Alt | Nb | V | Ti |
Max 0.20 | 0.10- 0.50 | Max 1.70 | Max 0.030 | Max 0.030 | Max 0.20 | Max 0.40 | Max 0.08 | Max 0.35 | Min 0.020 | 0.020- 0.050 | 0.05- 0.10 | 0.007- 0.050 |
Note: Nb+V+Ti =<0.12%
3.2 Steel making process: EAF+LF/VD
3.3 Tensile properties
The tensile properties of NVE690 shall meet the requirement as table 2.
Table 2 Tensile properties
Thickness mm | Yield strength MPa | Tensile strength MPa | Elongation % |
80-100 | Min 690 | 770-940 | Min 14 |
3.4 Impact properties
Impact test in the longitudinal and transverse for plates of NVE690 shall meet the requirements per table 3.
Table 3 Impact properties
Charpy-V Impact test | Transverse | Longitudinal | ||
Test temp. | Single energy | Average impact energy | Single energy | Average impact energy |
-40 Celsius degree | Min 49J | Min 70J | Min 70J | Min 100J |
3.5 Grain size
Grain size for plates shall be according to DNV-OS-B101.
3.6 Surface quality
The surface quality of plates shall be accordance with DNV-OS-B101
3.7 Ultrasonic inspection
Plates shall be ultrasonic inspected per EN10160 S1E1.
3.8 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
No. | Test item | Quantity, Piece | Direction | Test menthod |
1 | Product analysis | 1 (per heat treatment pc) | / | According to DNV Rules |
2 | Tensile test | 1 (per heat treatment pc) | Transverse | |
3 | Charpy-V impact test at -40C | 3 (per heat treatment pc) | Transverse | |
4 | 3 (per heat treatment pc) | Longitudinal |
4. Package, marking and certificate
Package, marking and certificate shall conform to DNV-OS-B101.
5. The third party inspection
The chemical composition, tensile test and Charpy -V impact test for plates of NVE690 shall be witnessed by surveyor of DNV.
6. Delivery conditions
The delivery conditions for plates of NVE690 shall be Normalized.
7. Other requirements
The other requirements for plates of NVE690 shall be accordance with DNV-OS-B101.
MTC accordance with EN10204: 2004 3.2
