Technical conditions for plates of A 514GrQ
1. Scope
The technical conditions apply to plates of A 514GrQ with thickness not more than 150mm. (8mm-150mm)
2. Adopt standard:
ASTM A 514/A 514M Standard Specification for High-Yield-Strength, Quenched and Tempered Alloy Steel Plate, Suitable for Welding
ASTM A6/A6M Standard Specification for General Requirements for Rolled Structural Steel Bars, Plates, Shapes, and Sheet Piling
ASTM A370 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 ASTM A6/A6M.
Thickness tolerance: +/-1.52mm
Flatness: 4mm/m
Surface shot blasting or peeled.
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)
C | Si | Mn | P | S | Cr | Ni | Mo | V | B | Ti |
Max 0.18 | 0.15- 0.35 | 0.95- 1.30 | Max 0.020 | Max 0.006 | 1.00- 1.50 | 1.20- 1.50 | 0.40- 0.60 | 0.030- 0.080 | Max 0.005 | Max 0.02 |
Note: Per furnace analysis [N] not more than 80ppm, [O] not more than 30ppm.
4.2 Steel making process: EAF+LF/VD
4.3 Carbon equivalent (CEq)
Carbon equivalent shall be not more than 0.76 for plates of A514GrQ.
Carbon equivalent shall be calculated as follows:
CEq=C+Mn/6+(Cr+Mo+V)/5+(Ni+Cu)/15 (%)
4.4 Mechanical properties
The mechanical properties of A 514GrQ shall meet the requirement as table 2.
Table 2 Mechanical properties
Size mm | Mechanical properties | Lateral expansion
mm | Hardness test 1/4 T HB | |||
Yield strength MPa | Tensile strength MPa | Section shrinkage ratio % | Elongation % | |||
150 | Min 690 | 770-890 | Min 50 | Min 14 | Min 0.38 | 230-290 |
4.5 Impact properties
Impact test in the longitudinal and transverse for plates of A 514GrQ shall meet the requirements per table 3.
Table 3 Impact properties
Charpy-V Impact Test temp. Celsius degree | Transverse 1/4 Thickness | Longitudinal 1/4 Thickness | ||
Average impact energy | Average impact energy | |||
-40C | Min 46J | -40C | Min 69J | |
4.6 Grain size
Grain size for plates shall be according to A 514GrQ.
4.7 Surface quality
The surface quality of plates shall be accordance with ASTM A6/A6M.
4.8 Ultrasonic inspection
Plates shall be ultrasonic inspected per ASTM A578/A578M level C.
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
No. | Test item | Quantity, Piece | Direction | Test menthod |
1 | Hardness | 1 | / | According to ASTM A370 |
2 | Tensile test | 2 (per heat treatment pc) | Transverse/ Longitudinal | |
3 | Charpy-V impact test at -40C | 3 (per heat treatment pc) | Longitudinal | |
4 | 3 (per heat treatment pc) | Longitudinal | ||
5 | Gas analysis | 1 | / | GB/T 14265 |
6 | Non metallic inclusion | 1 | / | GB/T 10561 |
5. Package, marking and certificate
Package, marking and certificate shall conform to ASTM A6/A6M.
6. The third party inspection
The chemical composition, tensile test and Charpy -V impact test for plates of A 514GrQ shall be witnessed by surveyor of ABS.
7. Delivery conditions
The delivery conditions for plates of A 514GrQ shall be Quenching +Tempering.
8. Other requirements
The other requirements for plates of A 514GrQ shall be accordance with A 514GrQ.
MTC accordance with EN10204: 2004 3.2
