The invention relates to a low-carbon bainitic steel for
engineering machinery, which is prepared from the following chemical components in percentage by weight: 0.05-0.10% of C, 0.20-0.50% of Si, 1.50-1.80% of Mn, at most 0.010% of S, at most 0.018% of P, at most 0.10% of Nb, at most 0.10% of Mo, 0.010-0.040% of Ti, 0.0010-0.0030% of B, 0.20-0.50% of Cr, 0.015-0.050% of Al and the balance of Fe and trace
impurity. The existing equipment is utilized; molten iron pretreatment, reblowing converter
smelting, LF (
ladle furnace) refining, RH refining, and plate blank
continuous casting are carried out; and the contents of part of elements are adjusted, microalloying treatment, TMCP (thermomechanical rolling process) production, controlled rolling and
water cooling are carried out, and no heat treatment is required, thereby obtaining the bainitic steel for
engineering machinery, which has the advantages of high strength and favorable low-temperature
toughness. The bainitic steel for
engineering machinery is widely used in the fields of engineering machinery manufacturing and the like, such as large-size load-bearing
steel structures, large-size earth mover, autocranes, excavators, mining machines, hydraulic supports, electric wheel dump trucks, mine cars and the like.