Wugang Q345FT.Q420FT.Q550FT.Q690FT wind power supply
Q345FT.Q420FT.Q550FT.Q690FT supply technology conditions
1 Classification and code
The grade of steel is represented by the yield strength of the Chinese phonetic alphabet, yield strength value, "wind tower" of the first letter of the Chinese phonetic alphabet, quality, etc.
Class symbol and other parts of the composition. For example: Q345FTD
Q - wind tower steel yield strength "bend" the first words of the Chinese phonetic alphabet, uppercase;
345 - yield strength value, unit N/mm2;
FT - "wind tower" the first letter of the Chinese phonetic alphabet;
D - quality grade is D, uppercase.
When the plate thickness direction has required performance, in the above provisions were added after the brand on behalf of thickness (Z to) performance level
Symbol "Z15 (Z25, Z35)". Such as: Q345FTDZ15.
2 dimensions, shape, weight and tolerances
Plate size, shape, weight and tolerances shall comply with the provisions of GB/T 709. (the thickness deviation should be consistent with GB/T 709 partial B
Poor regulation
3 technical requirements
Grade and chemical composition
The grade and chemical composition of steel (melting analysis) should be consistent with the provisions of table 1.
4 smelting method
The wind tower structural steel by converter or electric furnace smelting, refining and should be carried out.
5 Delivery Status
Structural steel plate for wind tower with different grades and thickness,
6 process and mechanical properties
Thickness 12mm steel standard specimens for impact test of 10mm * 10mm * 55mm; thickness less than 12mm steel, should
The impact absorption energy of 5mm * 7.5mm * 55mm * 10mm * 55mm * 10mm is not less than 75% of the specified value of the table 4.
Or 50%, give priority to the larger size of the sample.
The impact test results plate by a group of 3 sample arithmetic mean value calculation. Allows 1 of these tests to be below the specified value
Value, but should not be less than the specified value 70%, otherwise, from the same sampling plate and 3 specimens tested, has 6 sample test
Shall not be less than the prescribed value of the arithmetic mean, allowed to have 2 sample test results is lower than the specified value, but less than the specified value 70%
The specimen is only allowed to have one.
Z to the steel thickness section shrinkage shall comply with the requirements of 5313 GB/T.
7 surface quality
The steel surface should not have bubbles, cracks, scarring, folding, inclusion, pressed into the use of iron oxide of harmful defects. Steel plate should not
A visual hierarchy. If any of these defects are allowed to be cleaned, the depth should not be greater than the thickness of the steel plate, and the plate should be guaranteed.
For the minimum thickness, the defect should be smooth without edges and corners.
8 special requirements
Through negotiation between the parties, steel plate and nondestructive testing, inspection method according to GB/T 2970 or JB/T 4730.3 regulations,
The implementation of standards and levels should be clear in the agreement or contract.
According to the negotiation between the parties, the inspection plate can also be other projects