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

An ultra-high strength, welding process technology, applied in the direction of manufacturing tools, welding equipment, and process efficiency improvement, can solve problems such as low strength, and achieve the effect of improving comprehensive mechanical properties, excellent welding performance, and low overall cost

Inactive Publication Date: 2013-04-24
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. Melt most of the scrap steel 188.16kg and scrap iron 3.78kg, the melting temperature is 1550°C, after all the large materials are cleared, then add 1.91kg of low-carbon ferrochromium FeCr69C0.25 and 2.38kg of molybdenum iron alloy FeMo60-A for melting, 10 minutes before being released from the furnace, carry out slagging treatment, then add 0.65kg of ferrosilicon FeSi75Al1.0-A, 2.17kg of medium carbon ferromanganese FeMn78C2.0, 3 minutes before releasing from the furnace, add 0.37kg of ferrotitanium FeTi30-A, and finally put Add 0.24kg of...

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. Melt most of the scrap steel 187.62kg and scrap iron 4.22kg, the melting temperature is 1580°C, after all the large materials are cleared, then add 2.00kg of medium-carbon ferrochrome FeCr69C1.0 and 2.12kg of molybdenum-iron alloy FeMo70 for smelting. 7min, carry out slagging treatment, then add 0.75kg ferrosilicon FeSi75-A, 2.49kg medium carbon ferromanganese medium carbon ferromanganese FeMn82C1.5, 2min before the furnace, add 0.24kg ferrotitanium FeTi40-A, and finally put Add 0.27kg of final deoxidizer Al and 0.29kg of rare earth ferro...

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. Melt most of the scrap steel 184.64kg and scrap iron 4.45kg first, the melting temperature is 1560℃, after all the large materials are cleared, then add 2.81kg of medium-carbon ferrochrome FeCr55C100 and 2.81kg of molybdenum-iron alloy FeMo55-A for smelting. 10 minutes, carry out slagging treatment, then add 0.97kg of ferrosilicon FeSi65, 3.33kg of medium carbon ferromanganese FeMn84C0.4, 3 minutes before the furnace, add 0.41kg of titanium iron FeTi30-B, and finally put 0.29kg of final deoxidizer at the bottom of the ladle Al and 0.29kg ...

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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: 0.15 to 0.21 percent of C, 0.17 to 0.37 percent of Si, 0.5 to 0.8 percent of Mn, 0.7 to 1.0 percent of Cr, 0.45 to 0.55 percent of Mo, 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. The superhigh strength cast steel reduces theC content, the Cr content and the Mo content, maintains the Si content and the Mn content unchanged, adds the elements of Ti and Re, increases one step of normalizing treatment based on the conventional industrialized heat treatment process, obviously improves comprehensive mechanical properties, 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): C22C38/28C22C38/50C22C33/06C21D1/28B22D1/00B23K31/02
CPCY02P10/20
Inventor 郭海周孙玉福李建伟贾祥才张俊峰王晓峰
Owner CATERPILLAR ZHENGZHOU
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