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Ultra-high strength spring steel having high plasticity and preparation method thereof

An ultra-high-strength, spring steel technology, applied in the field of ultra-high-strength spring steel and its preparation, can solve the problems of limited strength improvement and difficulty in obtaining plasticity, and achieve the effect of increasing strength

Active Publication Date: 2019-09-13
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] On the other hand, the current traditional heat treatment process for suspension spring steel is austenitization at 860-930°C + oil quenching at 15-25°C + medium temperature tempering at 360-470°C + water cooling or air cooling, and the matrix structure is tempered. body, which has the characteristics of low internal stress and good plasticity, but it is often difficult to obtain good plasticity while further improving the strength by using traditional heat treatment processes, and the strength improvement is limited, so new alloy composition designs or new heat treatment process designs are required to meet the requirements. Enterprise requirements for product performance

Method used

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  • Ultra-high strength spring steel having high plasticity and preparation method thereof
  • Ultra-high strength spring steel having high plasticity and preparation method thereof
  • Ultra-high strength spring steel having high plasticity and preparation method thereof

Examples

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Embodiment 1

[0045] This embodiment provides a method for preparing ultra-high-strength spring steel with high plasticity. The alloy composition of the spring steel is: C 0.53-0.57%, Si 1.40-1.60%, Mn 0.60-0.80%, Cr 0.60-0.80% , V 0.1~0.15%, Nb 0.007~0.015%, P≤0.008%, S≤0.008%, Al≤0.01%, O≤0.0009%, N≤0.0020, the balance is Fe and unavoidable impurities (steel ingot precise composition Refer to Table 1). The preparation process of the present embodiment spring steel is as follows:

[0046] (1) Electric furnace→refining (LF+VD)→billet continuous casting→full surface peeling treatment→heating furnace heating→high-speed wire rod rolling mill→Stelmo controlled cooling line cooling→spring steel wire rod.

[0047] (2) Heat treatment of high-plasticity ultra-high-strength spring steel such as figure 1 As shown, the specific description is as follows:

[0048] a. Wire-cut the workpiece on the wire rod.

[0049] b. Austenitization: raise the temperature of the heating furnace to 900±10°C, and wh...

Embodiment 2

[0055] This embodiment provides a method for preparing ultra-high-strength spring steel with high plasticity. The alloy composition of the spring steel is: C 0.54-0.57%, Si 1.40-1.60%, Mn 0.60-0.80%, Cr 0.60-0.80% , V 0.12~0.2%, Nb 0.01~0.03%, P≤0.008%, S≤0.008%, Al≤0.01%, O≤0.0009%, N≤0.0030, the balance is Fe and unavoidable impurities (steel ingot precise composition Refer to Table 1).

[0056] In the preparation process of the spring steel of this embodiment, the smelting and rolling process and austenitization are all the same as in Example 1, but the heat treatment process of Example 2 adopts an improved tin bath low-temperature isothermal quenching, and the average quenching rate is 240 ° C. the s -1 , isothermally held for 120 minutes, taken out, cooled with water at 25°C to room temperature, cooling rate 200-300°C·s -1 . Other processing conditions and steps are identical with embodiment 1.

Embodiment 3

[0061] This embodiment provides a method for preparing ultra-high-strength spring steel with high plasticity. The alloy composition of the spring steel is: C 0.53-0.57%, Si 1.40-1.60%, Mn 0.60-0.80%, Cr 0.60-0.80% , V 0.14~0.16%, Nb 0.08~0.025%, P≤0.008%, S≤0.008%, Al≤0.015%, O≤0.0009%, N≤0.0030, the balance is Fe and unavoidable impurities (the exact composition of the ingot Refer to Table 1).

[0062] In the preparation process of the spring steel in this example, the smelting and rolling processes are the same as in Example 1, but the austenitization in Example 3 is carried out at 890°C for 20 minutes, and the heat treatment process adopts an improved tin bath low-temperature isothermal quenching, the average Quenching speed is 240℃·s -1 , isothermally held for 240min, taken out, water cooled at 25°C to room temperature, cooling rate 200-300°C·s -1 . Other processing conditions and steps are identical with embodiment 1.

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Abstract

The invention relates to a preparation method of an ultra-high strength spring steel having high plasticity. The preparation method of the ultra-high strength spring steel having the high plasticity includes: when designing alloy compositions of the spring steel, adding moderate alloy elements V and Nb based on the 55SiCr steel sort, and enabling the spring steel to contain 0.1-0.25wt% of the V and 0.005-0.03wt% of the Nb; in a heat treatment process, first performing austenitizing treatment on the spring steel workpiece, and then performing tin bath low temperature isothermal quenching treatment, wherein conditions of the tin bath low temperature isothermal quenching treatment are as following: an isothermal quenching furnace is heated to 235-250 DEG C, the spring steel workpiece after passing through the austenitizing treatment is placed in the isothermal quenching furnace, a tin bath is used as the isothermal quenching furnace, quenching speed is 200-300 DEG C.s<-1>, the spring steel workpiece is fetched out after 30-480min of isothermal heat preservation, and then is cooled to room temperature in water at 15-25 DEG C, and cooling speed is 200-300 DEG C.s<-1>. According to the spring steel prepared by using the preparation method, tensile strength reaches above 2200MPa, the percentage of area reduction reaches above 40%, specific elongation reaches about 16%, and the productof strength and ductility reaches above 35GPa%. The spring steel can be used as automobile suspension spring steel so as to improve running stationarity of automobiles and traffic safety and riding comfort of driving and riding personnel.

Description

technical field [0001] The invention belongs to the technical field of alloy materials, in particular to an ultra-high-strength spring steel with high plasticity and a preparation method thereof. Background technique [0002] At present, the development principle of steel for automobiles is to increase the strength of steel and maintain or improve its plasticity. Increasing the strength can reduce the weight of the car to meet the needs of energy conservation and environmental protection, while the maintenance or improvement of toughness and plasticity can meet the design of the model and improve driving safety. The automobile suspension spring is an elastic element in the suspension, which is used to ease the impact suffered by the vehicle while it is running. It is subjected to high-frequency reciprocating compression movement during work, so the design stress and quality are very important for the stability of the vehicle and the occupants. Safety and comfort play a vita...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/24C22C38/26C22C38/34C21D1/20C21D8/06
CPCC21D1/20C21D8/065C21D2211/001C21D2211/002C21D2211/008C22C38/001C22C38/002C22C38/02C22C38/04C22C38/06C22C38/24C22C38/26C22C38/34Y02P10/20
Inventor 姜周华陈奎刘福斌李阳龚伟余嘉康从鹏安瑞栋
Owner NORTHEASTERN UNIV
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