A kind of medium carbon non-quenched and tempered steel and preparation method thereof

A technology of non-quenched and tempered steel and molten steel, applied in metal rolling, temperature control, etc., can solve problems such as surface cracking, achieve the effects of reducing internal stress, avoiding brittle cracking, and good toughness

Active Publication Date: 2022-07-01
BAOSTEEL SPECIAL STEEL SHAOGUAN CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The first purpose of the present application is to provide a medium-carbon non-quenched and tempered steel, so that the medium-carbon non-quenched and tempered steel can effectively solve the problem of surface cracking that easily occurs during processing while ensuring sufficient strength and toughness

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  • A kind of medium carbon non-quenched and tempered steel and preparation method thereof
  • A kind of medium carbon non-quenched and tempered steel and preparation method thereof
  • A kind of medium carbon non-quenched and tempered steel and preparation method thereof

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Embodiment 1

[0047] The present embodiment provides a medium carbon non-quenched and tempered steel, which is mainly prepared through the following steps:

[0048] The composition of medium carbon non-quenched and tempered steel includes: C 0.37%, Si 0.32%, Mn 1.24%, P 0.010%, S0.004%, Cr 0.12%, Ti 0.003%, Nb 0.002%, V 0.09%, Al 0.014 %, Ni 0.001%, N0.0134%, the balance is Fe and inevitable impurities, and Σ(Al+Nb+V+Ti) / N is 8.1.

[0049] The molten steel prepared from the above components is sequentially subjected to converter smelting, LF furnace refining, continuous casting and rolling. The size of the continuous casting billet is controlled to be 280mm×280mm, the specific water volume of the secondary cold water in the continuous casting production is 0.27L / kg, the temperature of the continuous casting billet entering the pit is 772-831°C, the cooling time in the pit is 106h, the pit temperature is 145°C, and the rolling The casting billet is heated before production. The temperature ...

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Abstract

The application relates to a medium carbon non-quenched and tempered steel and a preparation process thereof, belonging to the technical field of iron and steel production. In this application, by limiting the content of Al, Nb and Ti, accurately controlling the content of V and N, and controlling the ratio of Σ(Al+Nb+V+Ti) / N to be between 6-9, a suitable content and dispersed precipitation are formed in the steel. The carbides and nitrides of Al, Nb, V, Ti, etc. can be refined, so that the brittle cracking of the steel can be reduced and the surface quality can be improved while ensuring the strength and toughness of the steel. The present application can reduce the internal stress of the medium carbon non-quenched and tempered steel and reduce the crack susceptibility through the precise control of the multi-process node process in the preparation process.

Description

technical field [0001] The present application relates to the technical field of iron and steel production, in particular to a medium carbon non-quenched and tempered steel and a preparation method thereof. Background technique [0002] Medium carbon non-quenched and tempered steel is a high-strength steel, which has a wide range of applications in automobiles and other fields. In the prior art, the attention to medium carbon non-quenched and tempered steel focuses on its mechanical properties. For example, in order to improve the strength and toughness of medium carbon non-quenched and tempered steel, some solid solution strengthening elements (Si, Mn, etc.) and Refine grain elements (such as Al, V, Nb, Ti, etc.) to improve the strength and toughness of steel through solid solution strengthening, grain refinement strengthening, etc. However, the combination of fine-grained elements with C and N elements in steel will greatly increase the crack sensitivity of steel, resulti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/24C22C38/26C22C38/28C22C38/46C22C38/48C22C38/50B21B1/46B21B37/74C22C33/04
CPCC22C38/02C22C38/04C22C38/28C22C38/26C22C38/24C22C38/06C22C38/001C22C38/50C22C38/48C22C38/46C22C33/04B21B1/463B21B37/74
Inventor 刘年富钟芳华卢恩惠廖美华赵贺楠韩正
Owner BAOSTEEL SPECIAL STEEL SHAOGUAN CO LTD
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