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High-strength non-quenched and tempered steel connecting rod for heavy-duty car and manufacturing method thereof

A heavy-duty vehicle, non-quenched and tempered steel technology, applied in engine components, mechanical equipment, etc., can solve the problems of complex processing procedures, high steel consumption, easy bending, etc. big effect

Inactive Publication Date: 2020-11-03
SINO TRUK JINAN POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, connecting rods for heavy-duty vehicles are still mainly produced by quenched and tempered steel such as 40CrH, which not only has complicated processing procedures, high energy consumption, and large steel consumption, but also is easy to bend after quenching and tempering, and difficult to straighten.

Method used

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  • High-strength non-quenched and tempered steel connecting rod for heavy-duty car and manufacturing method thereof
  • High-strength non-quenched and tempered steel connecting rod for heavy-duty car and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Embodiment 1: A non-quenched and tempered steel connecting rod for high-strength heavy-duty vehicles, the following components are by weight percentage C0.39%, Si 0.56%, Mn 1.40%, P 0.014%, S 0.034%, Cr0.17%, V : 0.1%, Nb: 0.03%, C segregation content is 15%, S segregation content is 25%; its plastic index is 5% for transverse sample A5, Z is 10%, and the connecting rods produced adopt medium frequency induction heating furnace Heating, the heating temperature of the material section is 1160°C, the production cycle is 30S, and the die forging is carried out on the 3150t hot die forging press - descaling - hugging (trimming + correction), and then the hanging line controls the cooling, and the shot blasting is carried out after the off-line Descaled, its mechanical properties are R P0.2 600MPa, R m : 900MPa,A 5 is 12%, and the impact energy is 7J.

[0016] The plastic index of raw materials is shown in Table 1, the C segregation content is 2.24%, and the S segregation...

Embodiment 2

[0025] Embodiment 2: A non-quenched and tempered steel connecting rod for high-strength heavy-duty vehicles, the following components are by weight percentage C0.30%, Si 0.40%, Mn 1.10%, P 0.035%, S 0.030%, Cr0.10%, V : 0.05%, Nb: 0.015%, C segregation content is 10%, S segregation content is 20%; its plasticity index is 6.5% for transverse sample A5, Z is 11%, and the connecting rod is produced by medium frequency induction heating furnace Heating, the heating temperature of the material section is 1160 ℃, the production cycle is 30S, and the die forging is carried out on the 3150t hot die forging press - descaling - hugging (trimming + correction), and then the hanging line controls the cooling, and the shot blasting is carried out after the off-line Descaled, its mechanical properties are R P0.2 is 717MPa, R m : 1014MPa,A 5 = 13%, impact energy = 7J.

Embodiment 3

[0026] Embodiment 3: A non-quenched and tempered steel connecting rod for high-strength heavy-duty vehicles, the following components are by weight percentage C0.50%, Si 0.70%, Mn 1.50%, P 0.030%, S 0.050%, Cr0.30%, V : 0.15%, Nb: 0.040%, C segregation content is 12%, S segregation content is 23%; its plasticity index is 7% for transverse sample A5, Z position 11%, and the connecting rod produced adopts medium frequency induction heating furnace Heating, the heating temperature of the material section is 1160 ℃, the production cycle is 30S, and the die forging is carried out on the 3150t hot die forging press - descaling - hugging (trimming + correction), and then the hanging line controls the cooling, and the shot blasting is carried out after the off-line Descaled, its mechanical properties are R P0.2 Bit 703MPa, R m : 1011MPa,A 5 = 15.5%, impact energy = 8J.

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Abstract

The invention discloses a high-strength non-quenched and tempered steel connecting rod for a heavy-duty car and a manufacturing method thereof, and mainly relates to the field of manufacturing of non-quenched and tempered steel connecting rods. The steel comprises the following components in percentage by weight: 0.30-0.50% of C, 0.40-0.70% of Si, 1.10-1.50% of Mn, less than or equal to 0.035% ofP, 0.030-0.050% of S, 0.10-0.30% of Cr, 0.05-0.15% of V and 0.015-0.040% of Nb, and the plasticity indexes are as follows: the transverse sample A5 is more than or equal to 5%, Z is more than or equalto 10%, the C segregation content is less than or equal to 15%, and the S segregation content is less than or equal to 25%. The manufacturing method has the beneficial effects that the manufacturingprocess of the connecting rod can be greatly simplified, the strength of the produced connecting rod is higher, and correction is more convenient.

Description

technical field [0001] The invention relates to the field of manufacturing non-quenched and tempered steel connecting rods, in particular to a non-quenched and tempered steel connecting rod for high-strength heavy-duty vehicles and a manufacturing method thereof. Background technique [0002] Non-quenched and tempered steel is a kind of steel that achieves or approaches the mechanical properties of quenched and tempered steel through non-alloying (addition of Nb, V, Ti, N, B, etc.), controlled forging (rolling) and controlled cooling, etc., canceling the heat treatment process. High-quality or special-quality structural steel is the abbreviation of non-quenched and tempered medium-carbon micro-alloy structural steel, also known as micro-alloyed steel, which mainly simplifies the process and cancels quenching and tempering heat treatment, reduces energy consumption, and reduces manufacturing costs. At present, connecting rods for heavy-duty vehicles are still mainly produced ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/24C22C38/26B21K1/76
CPCB21K1/766C22C38/002C22C38/02C22C38/04C22C38/24C22C38/26
Inventor 纪同圣张继魁董伦鲁统轮李良晨季伟肖进于权武强亓茂富
Owner SINO TRUK JINAN POWER
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