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Non-quenched and tempered steel and preparation method and application thereof

A non-quenched and tempered steel, ladle refining technology, applied in the field of steel making and rolling, can solve the problems of harsh process conditions, difficult to control reasonably, and achieve the effect of improving comprehensive performance, reducing operation difficulty, and improving shock absorption energy

Pending Publication Date: 2022-06-28
CHENGDE JIANLONG SPECIAL STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the invention needs to strictly control the type and content of each component element of the steel, the process conditions are harsh, and it is difficult to reasonably control

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] The present embodiment provides a non-quenched and tempered steel and a preparation method thereof. The preparation method includes sequentially performing converter smelting, ladle refining, vacuum refining, billet continuous casting, heat treatment, bar rolling, cooling bed air cooling and stacking. Chill slowly. The converter smelting, ladle refining, vacuum refining and billet continuous casting are carried out by the method provided in Example 1 of CN 114150225A, and are not repeated here.

[0042] In this embodiment, the heating treatment includes preheating, heating and soaking in sequence; wherein, the temperature of the preheating is 900°C, and the time is 60 minutes; the temperature of the heating is 1190°C, and the time is 70 minutes; The soaking temperature was 1205° C. and the time was 100 min.

[0043] In this embodiment, the bar rolling includes preliminary rolling, finishing rolling and finishing rolling in sequence; wherein, the temperature of the prel...

Embodiment 2

[0046] The present embodiment provides a non-quenched and tempered steel and a preparation method thereof. The preparation method includes sequentially performing converter smelting, ladle refining, vacuum refining, billet continuous casting, heat treatment, bar rolling, cooling bed air cooling and stacking. Chill slowly. The converter smelting, ladle refining, vacuum refining and billet continuous casting are carried out by the method provided in Example 1 of CN 114150225A, and are not repeated here.

[0047] In this embodiment, the heating treatment includes preheating, heating and soaking in sequence; wherein, the temperature of the preheating is 800°C, and the time is 65 minutes; the temperature of the heating is 1140°C, and the time is 75 minutes; The soaking temperature was 1180° C. and the time was 110 min.

[0048] In this embodiment, the bar rolling includes preliminary rolling, finishing rolling and finishing rolling in sequence; wherein, the temperature of the prel...

Embodiment 3

[0051] The present embodiment provides a non-quenched and tempered steel and a preparation method thereof. The preparation method includes sequentially performing converter smelting, ladle refining, vacuum refining, billet continuous casting, heat treatment, bar rolling, cooling bed air cooling and stacking. Chill slowly. The converter smelting, ladle refining, vacuum refining and billet continuous casting are carried out by the method provided in Example 1 of CN 114150225A, and are not repeated here.

[0052] In this embodiment, the heating treatment includes preheating, heating and soaking in sequence; wherein, the temperature of the preheating is 900°C, and the time is 55 minutes; the temperature of the heating is 1240°C, and the time is 65 minutes; The soaking temperature was 1230° C. and the time was 80 min.

[0053] In this embodiment, the bar rolling includes preliminary rolling, finishing rolling and finishing rolling in sequence; wherein, the temperature of the preli...

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Abstract

The invention provides non-quenched and tempered steel and a preparation method and application thereof. The preparation method sequentially comprises the steps of converter smelting, ladle refining, vacuum refining, square billet continuous casting, heating treatment, bar rolling, cooling bed air cooling and stack cooling and slow cooling. The temperature of the heating treatment is less than or equal to 1240 DEG C; the heating treatment time is 200 to 250 minutes; the heating treatment comprises preheating, heating and soaking which are carried out in sequence; and the bar rolling comprises primary rolling, finish rolling and finish rolling which are sequentially carried out. According to the preparation method, the comprehensive performance of the non-quenched and tempered steel is improved, especially the impact absorbing energy of the non-quenched and tempered steel is improved, meanwhile, the process conditions are simplified, and the operation difficulty is reduced.

Description

technical field [0001] The invention belongs to the technical field of steel making and rolling, and relates to a non-quenched and tempered steel, in particular to a non-quenched and tempered steel and a preparation method and application thereof. Background technique [0002] Non-quenched and tempered steel is widely used in automobiles, construction machinery and other fields due to its excellent performance, high efficiency and energy saving, low cost of use and environmental protection. Non-quenched and tempered steel is the most widely used. [0003] However, compared with quenched and tempered steel, the impact absorption energy of non-quenched and tempered steel bars in the hot-rolled state is relatively low in terms of physical properties. According to GB / T 15712-2008, the approximate tensile strength range of ferrite-pearlite type non-quenched and tempered steel is 600-900MPa, and the room temperature U-notch impact absorption energy is 20-40J. Basically, except f...

Claims

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Application Information

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IPC IPC(8): C21D8/06
CPCC21D8/065
Inventor 王雪原刘健张志民周胜刚李文博
Owner CHENGDE JIANLONG SPECIAL STEEL