Development of Steel HT60 with Low Susceptibility to Liquid Zinc Embrittlement for Power Transmission Tower

Susceptibility of structural steel to liquid metal embrittlement during hot‐dip galvanizing in zinc 5 %‐aluminum alloy

“…The specimens were then prestressed and heated to 470 °C in liquid zinc and in air, respectively, and a load was applied until the specimens fractured. Using the ratio of the resulting fracture stresses of “in liquid zinc” to “in air,” the dependence of liquid metal embrittlement susceptibility on the alloying constituents of the steel was derived by means of regression analysis and incorporated into the standardization for the design of high‐strength steel tower structures as a carbon equivalent for galvanized components [24, 27, 28]. The impact of molten zinc on liquid metal embrittlement behavior of structural steel was investigated by using cold‐formed hollow sections made of mild steel, whereby the spectrum of zinc alloying elements was limited to relatively low total contents in the range of 0.05 %–0.65 % by mass [29].…”

“…Liquid metal embrittlement has been observed and described for a long time with regard to the metal combination of liquid zinc and solid steel. In addition to cracking in spot welds and during hot forming of continuous galvanized and high-strength thin sheet metal, occurring in the recent past, this phenomenon has been known for long, particularly in the field of batch hot-dip galvanizing, where damage to boiler steel and galvanized material has been reported [8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26]. However, these investigations had in common that they were carried out on pure or quasipure zinc melts.…”