Low-carbon aged steel and preparation method thereof

A aging steel and aging technology, applied in the field of metallurgy, can solve problems such as unreasonable material composition and heat treatment process, undeveloped low-carbon aging steel, and increased notch sensitivity, so as to achieve good cutting performance, increase hardness, and promote crystallization. The effect of grain refinement

Pending Publication Date: 2019-09-20
INNER MONGOLIA UNIV OF SCI & TECH
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Problems solved by technology

[0004] However, due to the unreasonable material composition and heat treatment process, the aging treatment of alloy steel to improve its strength is often accompanied by a decrease in toughness, which will lead to an increase in the notch sensitivity of the component and a decrease in fatigue resistance.
In order to improve the alloy composition of low-carbon aging steel and match the balance between heat treatment process and machining process, those skilled in the art have conducted a lot of research, and have not yet developed a low-carbon aging steel that can meet the needs of both heat treatment process and mechanical cutting process. , which has also become a key factor restricting the development of high-quality production of industrial machinery parts such as automobiles

Method used

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  • Low-carbon aged steel and preparation method thereof
  • Low-carbon aged steel and preparation method thereof
  • Low-carbon aged steel and preparation method thereof

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preparation example Construction

[0048] The present invention provides the preparation method of the low-carbon aging steel described in the above scheme, comprising the following steps:

[0049] (1) batching, casting and heat preservation treatment are carried out sequentially according to the chemical composition to obtain a low-carbon aging steel slab;

[0050] (2) Hot forging and cooling the billet described in the step (1) successively to obtain a billet before aging;

[0051] (3) Machining and shaping the pre-aging billet in step (2), performing aging treatment, and then air-cooling to room temperature to obtain low-carbon aging steel.

[0052] According to the chemical composition, the invention sequentially performs batching, casting and heat preservation treatment to obtain the low-carbon aging steel slab. In the present invention, after batching according to the chemical composition, the vacuum furnace is preferably used for melting and casting. In the present invention, the vacuum degree of the v...

Embodiment 1

[0062] A preparation method of low-carbon aging steel: comprising steps as follows:

[0063] Dosing according to the alloy composition in Table 1, smelting in a vacuum furnace, the vacuum degree is 0.1Pa, the melting temperature is 1548°C, the size of the cast slab is 300mm long × 250mm wide × 50mm thick, and the slab is kept at 1200°C for 30 Minutes later, hot forging to a thickness of 30mm, the temperature of the billet after hot forging is 865°C; the forged billet is cooled to 430°C at a cooling rate of 60°C / min, and then air-cooled to room temperature to obtain a billet before aging;

[0064] Cut a 20×20×250 mm sample from the pre-aging billet, heat the sample to 630° C. and keep it warm for 80 minutes to complete the aging heat treatment, and then air-cool to room temperature to obtain a square columnar part of low carbon aging steel.

Embodiment 2

[0066] A kind of low-carbon aging steel, according to the alloy composition in Table 1, the preparation method is the same as that of Example 1.

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Abstract

The invention provides a low-carbon aged steel and a preparation method thereof, and belongs to the technical field of metallurgy. The low-carbon aged steel comprises the following chemical components in percentage by mass: 0.04-0.16% of C, 0.01-0.55% of Si, 1.5-2.6% of Mn, 0.45-1.55% of Cr, 0.005-0.05% of Al, 0.2-0.6% of V, 0.05-1% of Mo, 0.08-0.35% of Cu, 0.08-0.35% of Ni, 0.001-0.005% of Ca, 0.05-0.5% of Bi, 0.005-0.08% of rare earth, and the balance Fe. According to the low-carbon aged steel and the preparation method thereof, the alloy component and dosage of the low-carbon aged steel are optimized; the thermal treatment technology is improved; the hardness of the low-carbon aged steel before ageing treatment is small; the low-carbon aged steel is high in impact toughness, fatigue strength and hardness after ageing treatment; and the comprehensive requirement that industrial mechanical parts are easily processed and high in performances is met.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a low-carbon aging steel and a preparation method thereof. Background technique [0002] The steel used in the parts of industrial machinery such as automobiles is often required to have a high fatigue strength while ensuring a certain hardness. In the traditional process, high hardness and fatigue strength can be achieved by adding alloy elements to low carbon steel and supplemented by certain heat treatment processes. However, in the production of industrial machinery parts such as automobiles, it is generally necessary to hot-forge the steel blank first, and then machine cut it to a predetermined shape and size; however, the steel blank after adding alloy elements and heat treatment has higher hardness, When it is mechanically cut again, the cutting resistance is relatively large, which has a strong impact on the life of the cutter. [0003] In order to make the parts hav...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/06C22C38/42C22C38/44C22C38/46C22C38/58C21D6/00C21D8/00C22C33/04
CPCC21D6/004C21D6/005C21D6/008C21D8/005C22C33/04C22C38/002C22C38/005C22C38/02C22C38/06C22C38/42C22C38/44C22C38/46C22C38/58
Inventor 高雪云王海燕王伟邢磊李瑞红谭会杰任慧平
Owner INNER MONGOLIA UNIV OF SCI & TECH
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