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the car clutch structure has undergone fundamental changes, and the traditional spiral spring clutch has gradually been replaced by the membrane spring clutch.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...

Examples

Embodiment 1

[0081] The composition mass percent of the hot-rolled steel strip embodiment of the automobile clutch diaphragm spring of the present embodiment is:

[0082] C: 0.46%, Si: 0.27%, Mn: 1.12%, Al: 0.021%, P: 0.012%,

[0083] S: 0.003%, Cr: 1.26%, V: 0.09%, N: 0.005ppm,

[0084] The balance is Fe and unavoidable impurity elements.

[0085] Manufacturing method embodiment one

[0086] What present embodiment makes is the hot-rolled steel strip of steel strip embodiment one, is to carry out on 180 tons of top and bottom re-blowing converters, slab continuous casting and 2250mm hot continuous rolling mill unit, and it adopts following sequential process route as follows: :

[0087] Hot metal pretreatment→converter smelting→outside refining→slab continuous casting→red feeding→slab heating→high pressure water descaling→rough rolling unit→high pressure water descaling→finish rolling unit→coiling→performance inspection →Packing logo →Storage. Its steps are characterized by:

[00...

Embodiment 2

[0117] The composition mass percent of the hot-rolled steel strip embodiment of the automobile clutch diaphragm spring of the present embodiment is:

[0118] C: 0.57%, Si: 0.25%, Mn: 0.67%, Al: 0.023%, P: 0.008%,

[0119] S: 0.003%, Cr: 0.88%, V: 0.27%, N: 0.004ppm;

[0120] The balance is Fe and unavoidable impurity elements.

[0121] Manufacturing method embodiment two

[0122] What present embodiment makes is the hot-rolled steel strip of steel strip embodiment two, is to carry out on 80 tons of top and bottom re-blowing converters, slab continuous casting and 2250mm hot continuous rolling train unit, and it adopts the following sequential process route as follows: :

[0123] Hot metal pretreatment→converter smelting→external refining→slab continuous casting→slab annealing→slab heating→high pressure water descaling→rough rolling mill→high pressure water descaling→finishing mill rolling→coiling→quality And performance inspection→packaging mark→warehousing. Its steps a...

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...

Examples

Embodiment 1

[0081] The composition mass percent of the hot-rolled steel strip embodiment of the automobile clutch diaphragm spring of the present embodiment is:

[0082] C: 0.46%, Si: 0.27%, Mn: 1.12%, Al: 0.021%, P: 0.012%,

[0083] S: 0.003%, Cr: 1.26%, V: 0.09%, N: 0.005ppm,

[0084] The balance is Fe and unavoidable impurity elements.

[0085] Manufacturing method embodiment one

[0086] What present embodiment makes is the hot-rolled steel strip of steel strip embodiment one, is to carry out on 180 tons of top and bottom re-blowing converters, slab continuous casting and 2250mm hot continuous rolling mill unit, and it adopts following sequential process route as follows: :

[0087] Hot metal pretreatment→converter smelting→outside refining→slab continuous casting→red feeding→slab heating→high pressure water descaling→rough rolling unit→high pressure water descaling→finish rolling unit→coiling→performance inspection →Packing logo →Storage. Its steps are characterized by:

[00...

Embodiment 2

[0117] The composition mass percent of the hot-rolled steel strip embodiment of the automobile clutch diaphragm spring of the present embodiment is:

[0118] C: 0.57%, Si: 0.25%, Mn: 0.67%, Al: 0.023%, P: 0.008%,

[0119] S: 0.003%, Cr: 0.88%, V: 0.27%, N: 0.004ppm;

[0120] The balance is Fe and unavoidable impurity elements.

[0121] Manufacturing method embodiment two

[0122] What present embodiment makes is the hot-rolled steel strip of steel strip embodiment two, is to carry out on 80 tons of top and bottom re-blowing converters, slab continuous casting and 2250mm hot continuous rolling train unit, and it adopts the following sequential process route as follows: :

[0123] Hot metal pretreatment→converter smelting→external refining→slab continuous casting→slab annealing→slab heating→high pressure water descaling→rough rolling mill→high pressure water descaling→finishing mill rolling→coiling→quality And performance inspection→packaging mark→warehousing. Its steps a...