The invention discloses a low-
alloy structural steel component for preparing a
petroleum drilling tool, which comprises the following elements in percentage by
mass: 0.32 to 0.41 percent of carbon, 0.12 to 0.38 percent of
silicon, 0.65 to 1.20 percent of
manganese, less than or equal to 0.010 percent of
phosphorus, less than or equal to 0.008 percent of
sulfur, 0.75 to 1.35 percent of
chromium, 0.2 to 0.4 percent of
molybdenum, less than or equal to 0.3 percent of
nickel, 0.01 to 0.04 percent of
niobium, 0.005 to 0.015 percent of
titanium and the balance of iron. The
alloy element ratio is improved and the technological process is optimized on the basis of the prior art, the problems that 4137MA
alloy structural steel is insufficient in
toughness, coarse and large in grain, limited in strength, poor in high-temperature stability and the like are successfully solved, no technical obstacle exists when the 4137MA alloy structural steel is implemented under the conditions of the prior art, and a
petroleum drilling tool made of the 4137MA alloy structural steel is good in
mechanical property and good in performance. Compared with the prior art, the material has the advantages of simple structure and high use safety, so that the probability of occurrence of accidents such as thread slipping or rod breakage of the
petroleum drilling tool is remarkably reduced, the popularization and application of the material have greater
economic benefits and
social benefits, the
mechanical property and the use reliability of the petroleum drilling
tool material are remarkably improved, and a
safer and more durable material solution is provided for petroleum
drilling engineering.