This invention discloses steel, in particular to steel for large power locomotive traction gear. The steel comprises the following components in
mass percent: 0.16 to 0.21 percent of carbon, 1.50 to 1.80 percent of
chromium, 1.50 to 1.70 percent of
nickel, less than 0.40 percent of
silicon, 0.50 to 0.90 percent of
manganese, less than 0.020 percent of
sulfur, less than 0.020 percent of
phosphor, 0.25 to 0.35 percent of
molybdenum, and balance of iron, wherein
hydrogen content is not more than 2 ppm; and
oxygen content is not more than 20 ppm. Compared with the prior art, the steel for large power locomotive traction gear has the advantages that chemical components are adjusted, carbon content and
nickel content are increased, the strength is ensured and simultaneously the
plasticity is improved,
sulfur content and
phosphor content are adjusted simultaneously, the
processing property is ensured, a novel material which has high strength and good
plasticity and can be processed easily is formed, and the special requirement for the steel for large power locomotive traction gear is satisfied.