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Acid soil corrosion resisting steel used for grounding grid and preparing method of acid soil corrosion resisting steel

A soil corrosion and acid corrosion-resistant technology, applied in the field of grounding grid corrosion-resistant steel and its preparation, can solve the problems of corrosion, galvanized layer damage, loss of anti-corrosion ability, etc.

Active Publication Date: 2015-11-18
CHINA ELECTRIC POWER RES INST +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the process of construction, installation, transportation, welding, backfilling, etc., the galvanized layer is inevitably damaged, resulting in local corrosion and being corroded quickly, and finally loses its anti-corrosion ability
Although copper-plated steel (copper-clad steel) is used, copper can alleviate the corrosion problem of galvanized steel to a certain extent, but it also brings a series of other problems: 1) Copper has a better effect on neutral and alkaline media Anti-corrosion performance, but poor corrosion resistance to acidic medium
Its service life is about 30 years in general soil, but less than 5 years in acidic soil; 2) There is a problem of anode corrosion to adjacent steel; 3) There are strict restrictions on copper content in water resources and soil in my country, and blindly use it in large quantities Copper-plated steel (copper-clad steel), copper will cause serious pollution to water and soil; 4) Copper-plated steel (copper-clad steel), using copper grounding devices, often lacks tower materials in actual operation
Pure stainless steel is rarely used as a grounding material due to the limitations of its use performance and processing performance, as well as price factors.

Method used

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  • Acid soil corrosion resisting steel used for grounding grid and preparing method of acid soil corrosion resisting steel
  • Acid soil corrosion resisting steel used for grounding grid and preparing method of acid soil corrosion resisting steel
  • Acid soil corrosion resisting steel used for grounding grid and preparing method of acid soil corrosion resisting steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0083] Preparation of acid soil corrosion resistant steel for ground grids:

[0084] C: 0.054, Si: 0.408, Mn: 0.795, P: 0.136, S: 0.0073, Cu: 0.376, Cr: 0.537, Al: 0.302, the balance is Fe;

[0085] (1) Smelting

[0086] Melting in a 500kg vacuum induction melting furnace → casting slab;

[0087] (2) Blank opening process

[0088] Billet heating system: heating to 1100°C, holding time is 1h;

[0089] 20MPa water pressure dephosphorization;

[0090] (3) Rolling process

[0091] Heating→rough rolling→finish rolling;

[0092] Heating temperature: 1100°C, holding time: 1h;

[0093] Rolling start temperature: 1100°C, final rolling temperature 850°C, final rolling diameter 12mm.

[0094] (4) Pulling

[0095] Annealing → pickling → cold drawing, the finished product diameter is 8mm.

[0096] The obtained product was subjected to a salt spray test, and its average corrosion rate was 0.8653.

Embodiment 2

[0098] Preparation of acid soil corrosion resistant steel for ground grids:

[0099] C: 0.054, Si: 0.403, Mn: 0.7967, P: 0.137, S: 0.0073, Cu: 0.341, Cr: 0.514, Al: 0.275, the balance is Fe;

[0100] (1) Smelting

[0101]Melting in a 500kg vacuum induction melting furnace → casting slab;

[0102] (2) Blank opening process

[0103] Billet heating system: heating to 1150°C, holding time is 1h;

[0104] 16MPa water pressure dephosphorization;

[0105] (3) Rolling process

[0106] Heating→rough rolling→finish rolling→water spray cooling;

[0107] Heating temperature: 1150°C, holding time: 1h;

[0108] Rolling start temperature: 1050°C, finish rolling temperature 900°C, rolling to a diameter of 12mm;

[0109] (4) Pulling

[0110] Annealing → pickling → cold drawing, the finished product diameter is 8mm.

[0111] The obtained product was subjected to a salt spray test, and its average corrosion rate was 0.8462.

Embodiment 3

[0113] Preparation of acid soil corrosion resistant steel for ground grids:

[0114] C: 0.054, Si: 0.171, Mn: 0.500, P: 0.0071, S: 0.0044, Cu: 0.331, Cr: 3.56, Ni: 0.375, Ti: 0.020, the balance being Fe;

[0115] (1) Smelting

[0116] Melting in a 500kg vacuum induction melting furnace → casting slab;

[0117] (2) Blank opening process

[0118] Billet heating system: heating to 1100°C, holding time is 1h;

[0119] 20MPa water pressure dephosphorization;

[0120] (3) Rolling process

[0121] Heating→rough rolling→finish rolling;

[0122] Heating temperature: 1100°C, holding time: 1h;

[0123] Rolling start temperature: 1100°C, final rolling temperature 850°C, final rolling diameter 12mm.

[0124] (4) Pulling

[0125] Annealing → pickling → cold drawing, the finished product diameter is 8mm.

[0126] The obtained product was subjected to a salt spray test, and its average corrosion rate was 0.8236.

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Abstract

The invention provides acid resisting soil corrosion steel used for a grounding grid and a preparing method of the acid soil corrosion resisting steel, and belongs to the field of transmission projects. The corrosion resisting steel comprises 0.03%-0.08% of C, 0.15%-1.0% of Si, 0.30%-0.90% of Mn, not larger than 0.15% of P, not larger than 0.01% of S, 0.15%-0.60% of Cu and 0.3%-4.0% of Cr, and further comprises one or more elements of Al, Ni, Ti, Mo, As and Re. By means of optimization of corrosion resisting steel components and the adoption of a vacuum induction melting furnace for steel making, due to the fact that water spraying cooling, carbide precipitation optimizing and other trial-producing technologies are adopted after rolling, the obtained corrosion resisting steel has the beneficial effects of being high in corrosion resistance, long in life cycle, low in cost and the like.

Description

【Technical field】 [0001] The invention relates to a ground grid corrosion-resistant steel used in the field of power transmission engineering and a preparation method thereof, in particular to an acid soil corrosion-resistant steel used for a ground grid and a preparation method thereof. 【Background technique】 [0002] The grounding grid of the transmission line plays the role of discharging and equalizing the lightning, static electricity and fault current, and is an important device to ensure the safe operation of the power grid. Most of the existing grounding grids are made of galvanized steel, and since the grounding material needs to be buried underground for a long time, the corrosion problem is more serious, and it is easy to cause the "lost ground" of electrical equipment, thereby affecting the safe operation of electrical equipment and endangering personal safety. In severe cases, even It will cause partial breakage of the grounding grid, resulting in major accident...

Claims

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Application Information

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IPC IPC(8): C22C38/20C22C38/50C22C38/22C21D8/00
Inventor 蔡焕青邵瑰玮胡霁文志科付晶陈怡曾云飞张予束龙张玉详蔡维丽吴永康贺伟陈亮唐鹏
Owner CHINA ELECTRIC POWER RES INST