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Low-carbon and high-chromium steel slab and continuous efficient production method thereof

A production method and technology of high chromium steel, applied in the direction of improving process efficiency, etc., can solve problems such as large temperature loss, unfavorable converter furnace condition stability and forward movement, long process flow, etc., to achieve continuous and efficient casting without self-leading The effect of pouring and reducing the difficulty of smelting

Active Publication Date: 2022-02-01
MAANSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The process route is converter smelting-RH vacuum treatment-converter post-alloying-LF refining-continuous casting. efficient production of steel
Another example is that the patent with the publication number CN 102827989 B discloses a production method of low-carbon high-chromium steel. The process route is converter smelting-RH vacuum treatment-LF refining-continuous casting, and the carbon content of converter tapping is over 0.2%. High, it is not conducive to efficient decarburization of RH, and the temperature loss of RH is relatively large

Method used

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  • Low-carbon and high-chromium steel slab and continuous efficient production method thereof
  • Low-carbon and high-chromium steel slab and continuous efficient production method thereof
  • Low-carbon and high-chromium steel slab and continuous efficient production method thereof

Examples

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Effect test

Embodiment 1

[0030] The chemical composition of the steel slabs of the various embodiments of the present invention is as shown in Table 1, and the composition detection is carried out according to GB / T 4336 "Measurement of Multi-element Content in Carbon Steel and Medium and Low Alloy Steel by Spark Discharge Atomic Emission Spectroscopy (conventional method)" .

[0031] Table 1 Chemical composition (%) of low-carbon ultra-high chromium weathering steel

[0032] Sample serial number C Si mn P S als Ti Ni Cu Cr Example 1 0.02 0.20 0.2 0.009 0.0006 0.040 0.018 0.30 0.37 4.19 Example 2 0.04 0.30 0.5 0.02 0.005 0.06 0.03 0.4 0.5 4.7 Example 3 0.028 0.21 0.35 0.012 0.0008 0.043 0.028 0.2 0.36 4.0 Example 4 0.022 0.10 0.34 0.012 0.003 0.02 0.01 0.35 0.3 4.40

[0033] The continuous high-efficiency production method of low-carbon high-chromium steel slabs in this embodiment adopts the smelting process of mo...

Embodiment 2

[0042] The chemical composition of the steel slab of this embodiment is as shown in Table 1, and its production method is also basically the same as that of Example 1, the difference is that some process parameters are adjusted in the actual operation:

[0043] In the converter smelting process, the strong bottom blowing process is adopted, the carbon and oxygen product is 0.0018%, the tapping carbon: 0.02%, and the oxygen: 600ppm;

[0044] In the converter smelting process, 7.3kg / t of copper plates and 5.6kg / t of nickel plates are added to the head of the scrap steel hopper; the total loading capacity of the converter is controlled to 308t, and the molten steel volume of the ladle is 290t when tapping; the end point temperature of the converter is controlled at 1670°C, The amount of steel lime added is 1806kg; the rated capacity of Shenggang ladle is 300 tons, and the amount of drainage sand added is 50kg;

[0045] In the RH vacuum treatment process, the RH decarburization ti...

Embodiment 3

[0050] The chemical composition of the steel slab of this embodiment is as shown in Table 1, and its production method is also basically the same as that of Example 1, the difference is that some process parameters are adjusted in the actual operation:

[0051] In the converter smelting process, the strong bottom blowing process is adopted, the carbon and oxygen product is 0.0016%, the tapping carbon: 0.02%, and the oxygen: 550ppm;

[0052] In the converter smelting process, 7kg / t of copper plates and 6kg / t of nickel plates are added to the head of the scrap steel hopper; the total load of the converter is controlled to 304t, and the amount of molten steel in the ladle is 285t when tapping; the end point temperature of the converter is controlled at 1660°C, and the lime The addition amount is 1500kg; the rated capacity of Shenggang ladle is 350 tons, and the addition amount of drainage sand is 50kg;

[0053] In the RH vacuum treatment process, the RH decarburization time is 7 ...

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Abstract

The invention discloses a low-carbon and high-chromium steel slab and a continuous efficient production method thereof, and belongs to the field of steelmaking continuous casting. The low-carbon and high-chromium steel slab comprises the following chemical components in percentage by weight: 0.02-0.04% of carbon; 0.1-0.3% of silicon; 0.2-0.5% of manganese; 0.020% or less of phosphorus; 0.005% or less of sulfur; 0.02-0.06% of aluminum; 0.2-0.4% of nickel; 0.3-0.5% of copper; 4.0-4.7% of chromium; 0.01- 0.03% of titanium; 0.0080% or less of nitrogen; 0.0040% or less of oxygen; 0.00025% or less of hydrogen; 0.0010-0.0035% of calcium, and the balance of iron and inevitable impurities. According to the production method, the smelting procedures of molten iron pretreatment, converter smelting, RH vacuum treatment, LF refining and continuous casting are adopted. The defects that in the prior art, the production cost of low-carbon high-chromium steel is generally high, and continuous and efficient production is difficult to achieve are overcome, high-pulling-speed continuous casting of nine furnaces or above can be achieved through reasonable process layout and reasonable distribution of loads of all the working procedures, and full-working-procedure efficient production is achieved.

Description

technical field [0001] The invention relates to the technical field of steelmaking and continuous casting, and more specifically relates to a low-carbon high-chromium steel slab and a continuous and efficient production method thereof. Background technique [0002] Low-carbon high-chromium steel has atmospheric corrosion resistance and certain low-temperature impact toughness, and is widely used in railway vehicles and other industries. Due to the addition of a small amount of alloying elements, such as Cu, P, Cr, Ni, etc., to the steel, it forms a dense, well-adhesive amorphous oxide protective film on the surface of the metal substrate, so that the corrosion process of the steel is almost It cannot be carried out in depth. The longer the time, the denser the protective film is, the more obvious the corrosion resistance is, and it has higher atmospheric corrosion resistance. It has better performance than ordinary bare metal structural steel. [0003] In the large-scale co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/42C22C38/50C21C7/06C21C7/10C22C33/04
CPCC22C38/02C22C38/04C22C38/06C22C38/42C22C38/50C22C38/001C22C33/04C21C7/10C21C7/06Y02P10/20
Inventor 熊华报黄曼郑晴单永刚张宜李应江汪建威胡晓光杨明罗霄
Owner MAANSHAN IRON & STEEL CO LTD
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