Technical conditions for plates of NVE420-Z35
1. Scope
The technical conditions apply to plates of NVE420-Z35 with thickness not more than 150mm. (10mm-150mm)
2. Dimension, Shape, Weight and Permissible Deviation
The dimension, shape, weight and permissible deviation shall meet the requirements of DNV RULES.
The flatness of plates shall be =< 5mm/1m and =<8mm/2m.
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)
Grade | Si | Mn | P | S | Cr | Ni | B | C | TAL | Nb | V | Ti |
NVA420 NVD420 NVE420 (Z35) | 0.10- 0.50 | Max 1.70 | Max 0.025 | Max 0.025 | Max 0.50 | Max 0.50 | Max 0.005 | Max 0.18 | 0.02- 0.08 | Max 0.05 | Max 0.05 | Max 0.03 |
3.2 Carbon equivalent (CEq)
Carbon equivalent shall be not more than 0.43 for plates of NVE420-Z35-Z35.
Carbon equivalent shall be calculated as follows:
CE=C+Mn/6+(Cr+Mo+V)/5+(Ni+Cu)/15 (%)
3.3 Tensile properties
The tensile properties of NVE420-Z35 shall meet the requirement as table 2.
Table 2 Tensile properties
Grade | Direction Transverse Akv, J | Yield strength MPa | Tensile strength MPa | Elongation % | |
NVA420 | 0C | Min 28J | Min 420 | 530-680 | Min 18 |
NVD420 | -20C | Min 28J | Min 420 | 530-680 | Min 18 |
NVE420-Z35 | -40C | Min 28J | Min 420 | 530-680 | Min 18 |
3.4 Impact properties
Impact test in the longitudinal and transverse for plates of NVE420-Z35 shall meet the requirements per table 3.
Table 3 Impact properties
Charpy-V Impact test | ||
Test temp. | Test direction | Average impact energy |
0,-20,-40 Celsius degree | Transverse | Min 28J |
3.5 Grain size
Grain size for plates shall be according to DNV RULES.
3.6 Surface quality
The surface quality of plates shall be accordance with DNV RULES.
3.7 Ultrasonic inspection
Plates shall be ultrasonic inspected per EN10160,S1E1.
3.8 Direction of Thickness
Through thickness tension testing shall be done according to EN10164 (%Re ≥ 35)
3.9 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
No. | Test item | Quantity, Piece | Sampling method | Test menthod |
1 | Chemical composition (Ladle analysis) | 1 (per heat treatment pc) | According to DNV RULES. | According to DNV RULES. |
2 | Tensile test | 1 (per heat treatment pc) | ||
3 | Charpy-V impact test at -40C | 3 (per heat treatment pc) | ||
4 | Grain size | 1 | ||
5 | Z35-Direction | 1 | EN10164 | EN10164 |
4. Package, marking and certificate
Package, marking and certificate shall conform to DNV RULES.
5. The third party inspection
The chemical composition, tensile test and Charpy -V impact test for plates of NVE420-Z35 shall be witnessed by surveyor of DNV.
6. Delivery conditions
The delivery conditions for plates of NVE420-Z35 shall be Quenching+ Tempering.
7. Other requirements
The other requirements for plates of NVE420-Z35 shall be accordance with DNV RULES..
