1550MPa-level spring flat steel and production method thereof

A flat steel and molten steel technology, applied in 1550MPa spring flat steel and its production field, can solve the problems of poor tempering resistance, failure to meet the requirements of high-end users, low Si content in steel, etc., to increase strength and improve decarburization Sensitivity, effects of increasing strength and toughness

Active Publication Date: 2019-01-08
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The performance of the steel of this invention reaches yield strength ≥ 1400MPa, tensile strength ≥ 1500MPa, elongation ≥ 9.5%, room temperature impact energy ≥ 20J, has good fatigue performance and atmospheric corrosion resistance; but the steel has a low Si content and is resistant to tempering Poor flexibility, unable to meet the requirements of high-end users

Method used

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  • 1550MPa-level spring flat steel and production method thereof
  • 1550MPa-level spring flat steel and production method thereof
  • 1550MPa-level spring flat steel and production method thereof

Examples

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Embodiment 1～10

[0046] The schematic diagram of the production process of the 1550MPa grade spring flat steel described in embodiments 1 to 10 is shown in figure 1 , including the following steps: molten iron desulfurization, converter smelting, LF refining, vacuum treatment, protective continuous casting, slab heating, rolling, cooling bed controlled cooling, pit entry slow cooling, the specific steps and process parameters are:

[0047] 1) Desulfurization of molten iron, using magnesium powder desulfurization process, controlling the S content [S] of molten iron out of the station to ≤0.01%, and removing the desulfurization slag in the tank;

[0048] 2) The amount of steel scrap loaded into the converter accounts for 10-15% of the total amount loaded; the converter adopts top-bottom compound blowing, and the end point adopts a high-drawing supplementary blowing process; the basicity of the final slag is ≥2.1; the control target of the end point C of the converter is ≥0.06~ 0.40%; tapping te...

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Abstract

The invention discloses 1550MPa-level spring flat steel. The 1550MPa-level spring flat steel comprises the following components in percentage by mass: 0.48 to 0.61 percent of C, 0.4 to 0.9 percent ofSi, 0.60 to 1.20 percent of Mn, less than or equal to 0.025 percent of P, less than or equal to 0.025 percent of S, 0.75 to 1.25 percent of Cr, 0.01 to 0.05 percent of Nb, 0.001 to 0.004 percent of B,0.010 to 0.025 percent of Al, 0.005 to 0.009 percent of N and the balance of Fe and unavoidable impurities. The steel for a spring, which has an excellent use property and an optimal tissue structure, is developed by combining composition and process innovation; furthermore, the preparation method is simple and low in cost, and has an important popularization and application value.

Description

technical field [0001] The invention belongs to the field of iron and steel metallurgical production and manufacturing, and relates to wire and bar iron and steel products and a production method thereof, in particular to a 1550MPa grade spring flat steel and a production method thereof. Background technique [0002] Spring flat steel for automobiles is the most important elastic element in the shock absorption system of various commercial vehicles, passenger cars and special vehicles, and is widely used in automobiles, railways, aviation, national defense and other fields. Due to the particularity of the service environment, spring flat steel is required to have high strength, good toughness, excellent hardenability and excellent resistance to elastic loss. [0003] The problem of energy shortage has become a prominent problem restricting the sustainable development of my country's automobile industry. No matter from the perspective of social or economic benefits, low-fuel ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/26C22C38/32C22C38/06C22C33/04C21C5/35C21D8/02
CPCC21C5/35C21D8/0226C22C33/04C22C38/02C22C38/04C22C38/06C22C38/26C22C38/32Y02P10/20
Inventor 丁礼权任安超帅习元张贤忠张帆鲁修宇夏艳花仇东丽廖扬标桂江兵
Owner 武汉钢铁有限公司
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