Chemical composition of Q420FTC wind tower steel plate

Q420FTC plate is a structural steel plate for wind power towers. It is a low-alloy high-strength steel used to manufacture buildings, bridges, and power grids. The steel index of the wind tower plate is required to be high, not only the strength is high, the fracture resistance is strong, but also the toughness in the low temperature state is strong, and it has good weldability. The meaning of Q420FTC, Q is the initial letter of yield, 420 is the yield value, FT is the initial letter of the wind tower, and C is the grade of the steel plate, which can be divided into Q420FTC, Q420FTD, Q420FTE, Q420FTF. When the steel plate is required to have thickness direction performance, the symbols Z15, Z25, and Z35 representing the performance level in the thickness direction shall be added after the second and the grades specified above.

Smelting analysis of chemical elements of Q420FTC wind tower steel plate:

Remarks for ingredients: At least one of Al, Nb, V, Ti should be added to refine grain elements, which can be added separately or in any combination, and ensure that at least one of them has a content of ≥0.015. When mixed, the total amount is ≤0.22; 
Alt can be used instead of Als, at this time Alt≥0.02; if other solid N elements are added, acid-soluble aluminum (Als) and total aluminum (Alt) content are not applicable.
Ceq = C+Mn/6+(Cr+Mo+V)/5+(Ni+Cu)/15
Pcm=C+Si/30+(Mn+Cu+Cr)/20+Ni/60+Mo/15 +V/10+5B

Q420FTC wind tower steel plate implements the standard GB/T28410. Q420FTC steel plates are usually delivered in hot rolling, controlled rolling, normalizing rolling, normalizing, TMCP, TMCP+tempering conditions.