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Superhigh strength cast steel, and preparation method and welding process thereof

A technology of ultra-high strength and welding process, applied in the direction of manufacturing tools, welding equipment, process efficiency improvement, etc., can solve the problem of low strength, achieve the effect of comprehensive mechanical performance improvement, excellent welding performance, and low comprehensive cost

Active Publication Date: 2012-10-31
CATERPILLAR ZHENGZHOU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention aims at the deficiency of low strength of existing cast steel, and provides an ultra-high strength cast steel and its preparation method and welding process

Method used

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  • Superhigh strength cast steel, and preparation method and welding process thereof
  • Superhigh strength cast steel, and preparation method and welding process thereof
  • Superhigh strength cast steel, and preparation method and welding process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] The preparation and use method of ultra-high-strength cast steel includes the following smelting, pouring, heat treatment and welding processes, and the specific process parameters are:

[0052] (1) Smelting process

[0053] Smelting is carried out in a 200Kg intermediate frequency furnace, and Q235 I-shaped steel scrap and Q10 pig iron with sulfur and phosphorus contents <0.03% respectively are selected as raw materials for smelting. First melt most of scrap steel 182.28kg and scrap iron 8.32kg, the melting temperature is 1550°C, after all the large materials are cleared, then add 1.93kg of low-carbon ferrochrome FeCr69C0.25, 0.85kg of molybdenum-iron alloy FeMo60-A, 2kg of electrolytic The nickel plate is smelted, and 10 minutes before the furnace is released, the slagging treatment is carried out, and then 1.97kg of ferrosilicon FeSi75Al1.0-A and 1.71kg of medium carbon ferromanganese FeMn78C2.0 are added. 3 minutes before the furnace is released, 0.37kg of titanium ...

Embodiment 2

[0062] The preparation and use method of ultra-high-strength cast steel includes the following smelting, pouring, heat treatment and welding processes, and the specific process parameters are:

[0063] (1) Smelting process

[0064] Smelting is carried out in a 200Kg intermediate frequency furnace, and Q235 I-shaped steel scrap and Q10 pig iron with sulfur and phosphorus contents <0.03% respectively are selected as raw materials for smelting. First melt most of scrap steel 181.86kg and scrap iron 7.63kg, the melting temperature is 1580°C, after all the large materials are cleared, then add 2.10kg of medium-carbon ferrochrome FeCr69C1.0, 0.99kg of molybdenum-iron alloy FeMo70, 2.16kg of electrolytic nickel The slab is smelted, and 7 minutes before the furnace is released, the slagging treatment is carried out, and then 2.10kg of ferrosilicon FeSi75-A and 2.28kg of medium carbon ferromanganese FeMn82C1.5 are added. 2 minutes before the furnace is released, 0.33kg of titanium iron...

Embodiment 3

[0073] The preparation and use method of ultra-high-strength cast steel includes the following smelting, pouring, heat treatment and welding processes, and the specific process parameters are:

[0074] (1) Smelting process

[0075] Smelting is carried out in a 200Kg intermediate frequency furnace, and Q235 I-shaped steel scrap and Q10 pig iron with sulfur and phosphorus contents <0.03% respectively are selected as raw materials for smelting. First melt most of the scrap steel 180.39kg and scrap iron 7.97kg, the melting temperature is 1560°C, after all the large materials are cleared, then add 2.58kg of medium-carbon ferrochrome FeCr55C100, 1.27kg of molybdenum-iron alloy FeMo55-A, 2.28kg of electrolytic nickel The slab is smelted, and 8 minutes before it is released from the furnace, slagging treatment is carried out, and then 2.33kg of ferrosilicon FeSi65 and 2.42kg of low-carbon ferromanganese FeMn84C0.4 are added. Add 0.22kg of final deoxidizer Al and 0.19kg of rare earth ...

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Abstract

The invention relates to superhigh strength cast steel, and a preparation method and a welding process thereof. The superhigh strength cast steel comprises the following chemical components in percentage by weight: 0.20 to 0.25 percent of C, 0.6 to 0.9 percent of Si, 0.3 to 0.6 percent of Mn, 0.9 to 1.2 percent of Cr, 0.15 to 0.25 percent of Mo, 0.9 to 1.2 percent of Ni, 0.02 to 0.04 percent of Ti, 0.01 to 0.02 percent of Re residue, 0.03 to 0.05 percent of Al residue, less than or equal to 0.03 percent of S, less than or equal to 0.03 percent of P and the balance of Fe. In the superhigh strength cast steel, the C content, the Si content, the Cr content and the Ni content are increased, the Mo content is reduced, the elements of Ti and Re are added, and one step of normalizing treatment is increased based on the conventional industrialized heat treatment process, so that comprehensive mechanical properties are obviously improved, and the superhigh strength cast steel has excellent welding performance and low comprehensive cost, and can meet the using requirement of cast steel materials for large mining height hydraulic brackets completely.

Description

technical field [0001] The invention relates to cast steel, a preparation method and a welding process thereof, in particular to an ultra-high-strength cast steel, a preparation method and a welding process thereof. Background technique [0002] At present, steel castings are used for some components such as column nests, connectors, and guide rails of hydraulic supports used in the coal mine industry. Since the support has to bear the vertical pressure from the roof and the alternating impact load caused by the falling of a large amount of coal and stone during work, it is required that the steel castings of column sockets have better comprehensive mechanical properties and good welding performance. [0003] With the needs of the market, the coal machinery industry is vigorously developing high-end hydraulic supports with large mining heights. Due to the high working face of fully mechanized mining, the requirements for support strength have also been greatly increased, whi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/50C22C33/06C21D1/28B22D1/00B23K31/02
CPCY02P10/20
Inventor 郭海周孙玉福张俊峰贾祥才卢云杰赵靖宇
Owner CATERPILLAR ZHENGZHOU