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Non-quenched and tempered steel for heavy truck balance shaft and manufacturing method thereof

A non-quenched and tempered steel, heavy-duty vehicle technology, applied in the field of automobile manufacturing, can solve the problems of difficult to meet the higher requirements of steel strength and toughness, no application of non-quenched and tempered steel, low toughness, etc., to achieve high fatigue life, good strength. The effect of toughness matching and excellent performance

Inactive Publication Date: 2015-05-27
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The tensile strength of the most successful F+P type non-quenched and tempered steel in China is lower than 1000MPa, and its toughness is low, so it is difficult to meet the higher requirements for the strength and toughness of steel for lightweight vehicles
Moreover, at present, there is no precedent for the application of non-quenched and tempered steel on the balance shaft of heavy-duty vehicles of domestic commercial vehicle manufacturers.

Method used

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  • Non-quenched and tempered steel for heavy truck balance shaft and manufacturing method thereof
  • Non-quenched and tempered steel for heavy truck balance shaft and manufacturing method thereof

Examples

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Effect test

Embodiment 1

[0036] This embodiment provides a non-quenched and tempered steel for heavy-duty automobile balance shafts. The non-quenched and tempered steel includes the following components by mass percentage: C: 0.24%, Si: 0.33%, Mn: 1.96%, P: 0.007%, S : 0.039%, Cr: 0.49%, V: 0.12%, Ni: 0.03%, Cu: 0.04%, Mo: 0.01%, Ti: 0.012%, Alt: 0.030%, N: 0.014%, O: 0.0015%, H : 0.00005%, Sn: 0.003%, Sb: 0.002%, As: 0.006%, Pb: 0.005%, and the rest is Fe.

[0037] The preparation method of the above-mentioned non-quenched and tempered steel for the balance shaft of heavy-duty vehicles, the process of the preparation method is batching → electric furnace smelting → LF refining → VD vacuum treatment → continuous casting, and the specific operation steps are as follows:

[0038] (1) Prepare ingredients according to the above components and send the ingredients to the electric furnace for smelting. The P content is strictly controlled at 0.008%. The tapping temperature of molten steel is 1610°C. After s...

Embodiment 2

[0045] This embodiment provides a non-quenched and tempered steel for heavy-duty automobile balance shafts. The non-quenched and tempered steel includes the following components by mass percentage: C: 0.24%, Si: 0.32%, Mn: 1.95%, P: 0.007%, S : 0.040%, Cr: 0.51%, V: 0.10%, Ni: 0.04%, Cu: 0.04%, Mo: 0.01%, Ti: 0.015%, Alt: 0.021%, N: 0.015%, O: 0.0008%, H : 0.00008%, Sn: 0.002%, Sb: 0.003%, As: 0.003%, Pb: 0.006%, and the rest is Fe.

[0046] It is characterized in that: the process of the preparation method is batching → electric furnace smelting → LF refining → VD vacuum treatment → continuous casting, and the specific operation steps are as follows:

[0047] (1) Do the ingredients according to the above components and send the ingredients to the electric furnace for smelting. The P content is strictly controlled at 0.009%. The tapping temperature of the molten steel is 1650°C. After smelting, the LF refining furnace is used for refining, and the aluminum feeding wire 2.2 is ...

Embodiment 3

[0054] This embodiment provides a non-quenched and tempered steel for heavy-duty automobile balance shafts. The non-quenched and tempered steel includes the following components in terms of mass percentage: C: 0.24%, Si: 0.31%, Mn: 2.00%, P: 0.005%, S : 0.036%, Cr: 0.50%, V: 0.12%, Ni: 0.06%, Cu: 0.03%, Mo: 0.08%, Ti: 0.015%, Alt: 0.023%, N: 0.014%, O: 0.0010%, H : 0.00010%, Sn: 0.006%, Sb: 0.002%, As: 0.006%, Pb: 0.005%, and the rest is Fe.

[0055] It is characterized in that: the process of the preparation method is batching → electric furnace smelting → LF refining → VD vacuum treatment → continuous casting, and the specific operation steps are as follows:

[0056] (1) Prepare ingredients according to the above components and send the ingredients to the electric furnace for smelting. After smelting, LF refining furnace is used for refining. The P content is strictly controlled at 0.007%. The tapping temperature of molten steel is 1620°C. kg / t, VD is used for vacuum treatm...

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Abstract

The invention discloses a non-quenched and tempered steel for a heavy truck balance shaft. The non-quenched and tempered steel is prepared from the following components in percentage by mass: C, Si, Mn, P, S, Cr, V, Ni, Cu, Mo, Ti, Alt, N, O, H, Sn, Sb, As, Pb and Fe. The invention also provides a preparation method of the non-quenched and tempered steel for the heavy truck balance shaft; the non-quenched and tempered steel is produced by virtue of smelting and refining, and reasonable heating, rolling control and cold control processes, and is excellent in properties: the tensile strength of the steel is 960-1000MPa, the yield strength of the steel is 700-750MPa, the elongation percentage of the yield is greater than or equal to 15%, the percentage reduction of area of the steel is greater than or equal to 40% and the longitudinal impact of the steel at the normal temperature of 20 DEG C is greater than or equal to 50J; in addition, the steel has an excellent toughness match, and is excellent in processability, high in forging technical adaptability and steady in performance.

Description

technical field [0001] The invention relates to a non-quenched and tempered steel and a manufacturing method thereof, in particular to a non-quenched and tempered steel used for an upper balance shaft of a heavy-duty vehicle and a manufacturing method thereof, belonging to the field of automobile manufacturing. Background technique [0002] The balance shaft assembly is the main component used in the balance suspension device of the double rear axle series heavy-duty vehicles. The balance shaft bracket bears the girder and acts as a support point. When the shaft bracket rotates, the leaf spring is installed on the shaft housing through bolts, and its two ends are grafted to one end of the two axle housings through rubber bearings. There is no rigid fixing between the leaf spring and the axle housing, and small longitudinal sliding can be done. The function of the balance shaft is to make the tire tilt up easily and have large movements without affecting the other three sides...

Claims

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Application Information

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IPC IPC(8): C22C38/60
Inventor 陶涛包雪鹏孙龙凤任元和
Owner NANJING IRON & STEEL CO LTD
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