Steel for non-quenched-and-tempered crankshaft of engine and preparation method of forging of steel

A non-tempering, engine technology, applied in the direction of manufacturing tools, temperature control, metal processing equipment, etc., to achieve the effect of reducing deformation resistance, large deformation, and refined grains

Active Publication Date: 2021-02-19
NANJING INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, high-end automobile engines have high requirements on the comprehensive mechanical properties of non-quenched and tempered crankshafts, such as grain size, ferrite content, tensile strength, yield strength, and hardness. Traditional crankshaft forging technology has been difficult to meet the above technologies. Require

Method used

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  • Steel for non-quenched-and-tempered crankshaft of engine and preparation method of forging of steel
  • Steel for non-quenched-and-tempered crankshaft of engine and preparation method of forging of steel
  • Steel for non-quenched-and-tempered crankshaft of engine and preparation method of forging of steel

Examples

Experimental program
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Effect test

Embodiment 1

[0040] A steel for non-quenched and tempered crankshafts of engines, containing chemical elements C: 0.38; Si: 0.57; Mn: 1.45; S: 0.055; Ni: 0.135; P: 0.022; Cr: 0.15; Mo: 0.046 ; Cu: 0.15; Ni: 0.137; V: 0.09; Al: 0.012; Ti: 0.010; N: 177ppm, the balance being Fe and impurities. Among them, the ratio of aluminum to nitrogen = 0.68, and the ratio of titanium to nitrogen = 0.56.

[0041] A method for preparing a forging of steel for an engine non-quenched and tempered crankshaft, comprising the following steps:

[0042] S1, smelting the above chemical elements into steel for non-quenched and tempered crankshafts of engines;

[0043] S2. Heat the engine non-quenched and tempered crankshaft steel to 1250°C; roll the material through the processes of starting rolling, water cooling, and finishing rolling. The starting rolling temperature is 1130°C, and the finishing rolling temperature is 1000°C. After rolling The diameter of the obtained bar is 90-100mm;

[0044] S3. Inductivel...

Embodiment 2

[0046] A steel for non-quenched and tempered crankshafts of engines, containing chemical elements C: 0.38; Si: 0.60; Mn: 1.46; S: ​​0.045; Ni: 0.147; P: 0.022; Cr: 0.14; Mo: 0.032 ; Cu: 0.17; Ni: 0.144; V: 0.08; Al: 0.010; Ti: 0.010; N: 166ppm, the balance being Fe and impurities. Wherein, the ratio of aluminum to nitrogen=0.60, and the ratio of titanium to nitrogen=0.60.

[0047] A method for preparing a forging of steel for an engine non-quenched and tempered crankshaft, comprising the following steps:

[0048] S1, smelting the above chemical elements into steel for non-quenched and tempered crankshafts of engines;

[0049] S2. Heat the engine non-quenched and tempered crankshaft steel to 1230°C; roll the material through the processes of starting rolling, water cooling, and finishing rolling. The starting rolling temperature is 1110°C, and the finishing rolling temperature is 980°C. After rolling The diameter of the obtained bar is 90-100 mm;

[0050] S3. Inductively hea...

Embodiment 3

[0052] A steel for non-quenched and tempered crankshafts of engines, containing chemical elements C: 0.39; Si: 0.65; Mn: 1.38; S: 0.056; Ni: 0.136; P: 0.022; Cr: 0.15; Mo: 0.025 ; Cu: 0.18; Ni: 0.137; V: 0.08; Al: 0.010; Ti: 0.008; N: 170ppm, the balance being Fe and impurities. Among them, the ratio of aluminum to nitrogen = 0.59, and the ratio of titanium to nitrogen = 0.47.

[0053] A method for preparing a forging of steel for an engine non-quenched and tempered crankshaft, comprising the following steps:

[0054] S1, smelting the above chemical elements into steel for non-quenched and tempered crankshafts of engines;

[0055] Such as figure 1 As shown in S2, heat the steel for non-quenched and tempered engine crankshafts to 1220°C; roll the material through the processes of starting rolling, water cooling, and finishing rolling. The starting rolling temperature is 1100°C, and the finishing rolling temperature is 970°C. The diameter of the bar obtained after the process...

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Abstract

The invention discloses steel for a non-quenched-and-tempered crankshaft of an engine. The steel is prepared from the chemical elements including, by weight, 0.37%-0.42% of C, 0.50%-0.65% of Si, 1.30%-1.50% of Mn, 0.045%-0.060% of S, 0.120%-0.150% of Ni, 0.010%-0.025% of P, 0.10%-0.20% of Cr, 0.015%-0.050% of Mo, 0.03%-0.20% of Cu, 0.120%-0.150% of Ni, 0.08%-0.13% of V, 0.010%-0.015% of Al, less than or equal to 0.010% of Ti and higher than or equal to 150ppm of N, the Al-to-N ratio is smaller than or equal to 1, and the Ti-to-N ratio is smaller than or equal to 0.67. The invention further discloses a preparation method of a forging of the steel for the non-quenched-and-tempered crankshaft of the engine. The strength of the crankshaft is enhanced, the toughness and plasticity of the crankshaft are improved, and the purpose of improving the comprehensive mechanical property of the crankshaft is achieved.

Description

technical field [0001] The invention relates to a preparation method of steel for an engine non-quenched and tempered crankshaft and a forging thereof, belonging to the technical field of metal materials. Background technique [0002] The crankshaft of the engine is subjected to the centrifugal force of the rotating mass, the periodically changing gas inertial force and the reciprocating inertial force when it is working, so the engine crankshaft is required to have good mechanical properties. At present, non-tuned and tempered engine crankshafts have been widely used in automobile engines. At the same time, high-end automobile engines have high requirements on the comprehensive mechanical properties of non-quenched and tempered crankshafts, such as grain size, ferrite content, tensile strength, yield strength, and hardness. Traditional crankshaft forging technology has been difficult to meet the above technologies. Require. Therefore, there is an urgent need for a prepara...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/00B21B37/74B21K29/00C21D8/06C22C38/00C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44C22C38/46C22C38/50C22C38/60
CPCB21B37/74B21K29/00B23P15/00C21D8/065C21D2211/009C22C38/002C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44C22C38/46C22C38/50C22C38/60
Inventor 赵秀明冯宇阳周蕾吴萌刘凯旋毛向阳刘磊魏刚武
Owner NANJING INST OF TECH
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