This article introduces Q235FTB structural steel for wind turbine towers manufactured by Chinese steel mills, hoping to meet your needs and encourage you to purchase this grade of steel.

Q235FTB Chemical Composition

Grage Class Chemical Composition(Quality Fraction)/%
C Mn  P S Si Nb V Ti Mo Cr Ni Cu Als N
≤ ≤ ≤ ≤ ≤ ≤ ≤ ≤ ≤ ≤ ≤ ≥ ≤
Q235FT B 0.18 0.50~1.40 0.030 0.025 0.50 0.050 0.060 0.050 0.10 0.30 0.30 0.30 0.015 0.012
note：The lower limit of Mn content for steel plates delivered in normalized condition shall be as specified in the table. No lower limit of Mn content shall be required for steel plates delivered in other conditions.

Q235FTB Mechanical properties and processing properties

Grage Class Lower yield strength
Rel /(N/mm²)
≥
Thickness mm		 Tensile strength 
Rm/(N/mm²)		 Elongation after fracture
A/%		 Impact energy
KV2 /J
≥		 180°bending test
d=mandrel diamete
a=specimen thickness
Thickness mm
≤16 ＞16~40 ＞40~100 ≤16 ＞16~100
Q235FT B 235 225 215 360~510 24 47 d=2a d=3a
1. When yield strength is not significant, Rp0.2 can be used instead of lower yield strength.
2. When the thickness is >60mm, the elongation after fracture can be reduced by 1%.
3. The impact test uses longitudinal specimens.
4. Impact test temperatures corresponding to different quality grades:  B: 20℃,  C: 0℃,  D: -20℃,  E: -40℃,   F: -50℃.