Hot-rolled U shaped metal sheet pile and microalloying production method

A technology of micro-alloying and production methods, applied in the direction of temperature control, etc., can solve the problems of difficult control, unstable weldability, increased production costs, etc., and achieve the effects of improving welding performance, increasing utilization rate, and improving overall performance

Inactive Publication Date: 2009-04-08
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

[0007] It can be seen from the above chemical composition that if you want to achieve the expected mechanical properties, you need to add more expensive alloys, which will inevitably increase the production cost and increase the complexity of the production process, which is difficult to control. In addition, because the hot-rolled U-shaped steel sheet pile A certain weldability is required, and the standard GB / T20933-2007 does not specify the N content, which will inevitably lead to unstable weldability

Method used

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  • Hot-rolled U shaped metal sheet pile and microalloying production method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The proportion of the chemical composition of the steel is as follows: C 0.17, Mn 0.91, Si0.40, P 0.018, S 0.012, Als 0.020, V 0.073, N 0.0029, and the rest are Fe and unavoidable impurities.

[0028] The production method sequentially includes 120t converter smelting, refining outside the furnace, continuous casting, heating, and universal rolling. The parameters of each step are:

[0029] During smelting, control the smelting temperature to 1660°C~1680°C; during out-of-furnace refining, control out-of-furnace refining time to ≥30min; add aluminum, manganese, and iron for pre-deoxidation, then add alloys MnFe, VFe or VN alloys in sequence, and then Feed Al wire for final deoxidation, feed Si-Ca wire for calcium treatment; the purpose of feeding Si-Ca wire for calcium treatment is to denature the inclusions in the steel; during continuous casting, the pouring temperature is 1570 ° C ~ 1580 ° C, The continuous casting superheat is controlled at 15-35°C, and the casting s...

Embodiment 2

[0032] The proportion of the chemical composition of the steel is as follows: C 0.19, Mn 1.15, Si0.27, P 0.010, S 0.011, Als 0.030, V 0.095, N 0.0028, and the rest is Fe and unavoidable impurities.

[0033] The preparation method is the same as in Example 1.

Embodiment 3

[0035] The proportion of the chemical composition of the steel is as follows: C 0.21, Mn 1.04, Si0.32, P 0.008, S 0.017, Als 0.030, V 0.030, N 0.0025, and the rest is Fe and unavoidable impurities.

[0036] Table 2: Mechanical performance test of the product

[0037] Example

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Abstract

The invention relates to a hot-rolled U-shaped steel sheet pile and a micro-alloying production method thereof, which belong to the field of iron and steel metallurgy and materials. The chemical components of the steel have the following mixture ratio by weight percent: 0.12-0.26 of C, 0.6-1.8 of Mn, 0.25-0.60 of Si, 0.020 or less of P, 0.020 or less of S, 0.010-0.050 of Als, 0.01-0.20 of V and 0.005 or less of N. The method sequentially comprises the steps of converter or electric furnace smelting, secondary refining, continuous casting, heating and rolling. The invention enhances the comprehensive performance of the steel sheet pile, improves the welding performance of the steel sheet pile, improves the utility ratio of the steel sheet pile and has simple production technology.

Description

technical field [0001] The invention relates to a hot-rolled U-shaped steel sheet pile and a microalloying production method thereof, belonging to the field of iron and steel metallurgy and materials. Background technique [0002] Steel sheet piles began to be produced in Europe at the beginning of the 20th century. In 1903, Japan imported them for the first time and adopted them in the soil retaining construction of Mitsui Honkan. Based on the special performance of steel sheet piles, in 1923, Japan used a large number of them in the restoration project of the Great Kanto Earthquake. Import adopted. Due to the large market potential and development prospects of steel sheet piles, production began in Japan in 1931. At present, the annual consumption of steel sheet piles in the world has reached 2.5-3 million tons, including about 800,000 tons in Japan and 1.4 million tons in Europe and the United States. In the 1950s, my country first imported and used it from the former S...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/12C21C7/06B22D11/16B21B37/74
Inventor 任安超周桂峰吉玉鲁明正韩斌罗德信朱敏周勇
Owner 武汉钢铁有限公司
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