The 12 mm steel plate (0.09C

0.28Si

1.12Mn

0.020P

0.006S

0.58Cr

0.25Ni

0.32Cu

0.045Nb

0.030Ti) for the bogie frame of high-speed train was successfully developed by hot metal pretreatment -260 t BOF-LF-RH- 170 mm slab casting-rolling process and TMCP (finished rolling at 850℃ fast cooling to 720℃

air cooling). It shows excellent low-temperature impact toughness (impact energy at -60℃ 166 ~ 255 J)

and all properties meets the requirements of YB/T 4684-2018. The microstructure consists of a large amount of polygonal ferrite and a small amount of pearlite. The atmospheric corrosion resistance index I is 6.3 ~6.7

and the relative corrosion rate of the steel plate is 54.7% com¬pared with Q345B by 72 h periodic alternate immersion and dry corrosion test. The surface of the rust layer is very dense. The atmospheric corrosion resistance of the steel plate is excellent.