The invention relates to steel for cold
forging of a
universal joint fork of a passenger car and a manufacturing method of the steel. The steel comprises the following chemical components in percentage by
mass: 0.04 to 0.10 percent of C, 0.01 to 0.12 percent of Si, 0.40 to 0.60 percent of Mn, less than or equal to 0.015 percent of P, 0.020 to 0.035 percent of S, less than or equal to 0.10 percent of Cr, less than or equal to 0.10 percent of Ni, less than or equal to 0.10 percent of Cu, less than or equal to 0.02 percent of Mo, 0.020 to 0.050 percent of Al, 0.007 to 0.009 percent of N and the balance of Fe and inevitable
impurity elements. The texture of the steel is ferrite and
pearlite, and the spheroidization rate of the
pearlite is larger than or equal to 85%. The production process
route comprises the steps of molten iron pretreatment, primary
smelting in a converter, refining,
continuous casting,
continuous casting billet cooling,
continuous casting billet heating, rolling, cooling, spheroidizing annealing and lathing. Taking a bar with the
diameter phi of 20-40 mm as an example, the surface
hardness is smaller than or equal to 110 HV30; Rp0.2 is smaller than or equal to 280 MPa, Rm is smaller than or equal to 360 MPa, the
ductility A5 is larger than or equal to 40%, the
percentage reduction of area Z is larger than or equal to 75%, and a product has excellent
plasticity and low deformation resistance and is steel for cold
forging with ideal performance.