Steel tube used for hollow stabilizer bar of automobile and manufacturing method of steel tube

Abstract

The invention discloses a steel tube used for a hollow stabilizer bar of an automobile and a manufacturing method of the steel tube. The steel tube is prepared from the following chemical components in mass percent: 0.28 to 0.40 percent of C, 0.05 to 0.35 percent of Si, 1.05 to 1.60 percent of Mn, 0.1 to 0.6 percent of Mo, 0.001 to 0.006 percent of B, 0.015 to 0.060 percent of Al, 0.1 to 0.8 percent of Cr, 0.003 to 0.06 percent of Ti, not greater than 0.006 percent of S, not greater than 0.015 percent of P, not greater than 0.003 percent of O and the balance Fe and other inevitable impurities,wherein Mo+50B+Cr is not less than 0.7 percent but is not greater than 1.3 percent. The steel tube disclosed by the invention is high in strength and plasticity, has high torsion fatigue resistance under a relatively high stress level, and can meet the using requirement of the stabilizer bar under a high-stress condition; and the specific performance indexes are shown as follows: as-quenched tensile strength is not less than 1700 MPa, as-quenched yield strength is not less than 1300 MPa, as-quenched ductility is not less than 12 percent, inner surface decarburization depth and outer surface decarburization depth are both 0, and under the condition of 550 MPa, the number of times of torsion fatigue is greater than 1200000.

Description

technical field [0001] The invention relates to a steel pipe for a hollow stabilizer bar of an automobile and a manufacturing method thereof. Background technique [0002] The stabilizer bar for the automobile transmission shaft is an auxiliary elastic component in the automobile suspension system. The function of the lateral stabilizer bar is to prevent the body from excessive lateral roll when turning, and to keep the body as balanced as possible. Roll degree and improved ride comfort. The stabilizer bar is actually a horizontal torsion bar spring, which can be regarded as a special elastic element in function. When the body only moves vertically, the suspension on both sides deforms the same, and the stabilizer bar does not work. When the car turns, the body rolls, the suspension on both sides jumps inconsistently, the outer suspension will press against the stabilizer bar, and the stabilizer bar will be twisted, and the elastic force of the bar body will prevent the wh...

AI Technical Summary

Problems solved by technology

[0005] Chinese patent CN104395487A discloses a steel pipe for a hollow stabilizer bar. The hollow stabilizer bar tube designed for the stabilizer bar has better fatigue performance, but more alloy elements are added, the manufacturing cost of the product is higher, and the torsion of the product is relatively high. Fatigue properties cannot meet the needs of tubes for higher stress hollow stabilizer bars

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