Hot rolled strip steel for automobile clutch diaphragm spring and manufacturing method thereof

Abstract

The invention relates to hot rolled strip steel for an automobile clutch diaphragm spring and a manufacturing method thereof. The strip steel consists of the following components in percentage by mass: 0.45-0.57 percent of C, 0.12-0.43 percent of Si, 0.62-1.18 percent of Mn, 0.015-0.06 percent of Al, less than or equal to 0.015 percent of P, less than or equal to 0.010 percent of S, 0.85-1.30 percent of Cr, 0.08-0.30 percent of V and less than or equal to 0.005ppm of N. The manufacturing method is characterized by comprising the following steps: I, external refining: LF deep desulfuration+RH vacuum degasification and Ca treatment of balling inclusion; II, slab continuous casting, wherein the casting speed is 0.6-2.0m / min; III, red charging of a slab, wherein the red charging temperature is higher than or equal to 150 DEG C; IV, slab heating, wherein the heating temperature is 1,210-1,280 DEG C; V, rough rolling unit rolling, wherein the rough rolling final temperature is 1,030-1,150 DEG C; VI, fine rolling unit rolling, wherein the fine rolling final temperature is 810-920 DEG C; and VII, strip steel coiling, wherein the coiling temperature is 600-800 DEG C. The tensile strength Rm of the hot rolled strip steel manufactured by using the method is less than or equal to 1,150MPa, the yield strength is less than or equal to 850MPa, the elongation percentage is more than or equal to 18 percent, and the thickness of a decarbonized layer is not larger than 1.1 percent of the thickness of strip belt.

Description

Technical field [0001] The invention involves a car clutch film spring with hot rolled steel and its manufacturing method. technical background [0002] Car clutch is an important part of the car transmission system, and there are many forms of clutch. [0003] With the development of automotive industry technology and the improvement of the manufacturing process, the car clutch structure has undergone fundamental changes, and the traditional spiral spring clutch has gradually been replaced by the membrane spring clutch. [0004] The manufacturing process of membrane springs is more complicated and requires high material and size accuracy.Compared with the spiral spring clutch, its torque capacity is large and stable, the operation is lightweight, the structure is simple, the number of clutch parts is reduced, the structure is compact, high -speed performance, and good balance.In recent years, the film spring clutch has not only been adopted on the car, but also has been widely u...