Production method of cast-state low-temperature ball iron

A production method and low-temperature technology are applied in the production field of as-cast low-temperature ductile iron, which can solve the problems of reducing toughness, increasing casting cost, and high production cost, and achieving the effects of high safety, production safety and convenient operation.

Inactive Publication Date: 2019-12-20
淄博乾能铸造科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, after more than ten years of rapid and explosive development, the wind power industry is now facing brutal market competition and has entered the post-market era. The spheroidization process is carried out by the flushing method, so there are generally high production costs, high reject rates, and unstable quality.
[0003] Patents CN101168191A "-20 ℃ low-temperature cast Ni-free ductile iron casting method for megawatt fan unit components" and CN101363097A "a low-temperature shock-resistant large-section cast ductile iron and its production method" respectively set the upper limit of the content of Mn element Defined at 0.35-0.4%, because Mn has a serious positive segregation tendency, it is often enriched at the grain boundary of the eutectic group, which promotes the formation of intergranular carbides and significantly reduces toughness; and the increase of Mn content, the pearlite content in the matrix increase, it is impossible to ensure that the content of ferrite in the matrix is ​​stable above 95%, and it cannot meet the requirements of the matrix structure with high reliability in the harsh operating environment of the product
[0004] Patent CN102071353B "A low-temperature-resistant high-toughness cast ductile iron, its production method and its application" needs to add 0.15-0.25% Ni, because my country's nickel mainly depends on imports, and nickel is expensive, which increases the cost of castings
In the patent CN103757172A "A Preparation Method for Nodular Cast Iron", it is necessary to keep warm at 500-550°C for 2-3 hours and carry out stress annealing process. The investment in heat treatment equipment and energy consumption are high, which increases the production cost; and it is suitable for cupola smelting. Cupola smelting is an obsolete process due to high energy consumption and environmental protection restrictions
[0005] Patent CN104451020A "A Production Process of Nodular Cast Iron" adopts graphite pretreatment technology, the process is complicated and the power consumption is high. At the same time, the spheroidization treatment adopts the punching method, and there are factors of artificial operation instability, which increase the probability of unqualified casting materials. Big

Method used

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  • Production method of cast-state low-temperature ball iron
  • Production method of cast-state low-temperature ball iron
  • Production method of cast-state low-temperature ball iron

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] The production method of as-cast low-temperature ductile iron according to the present invention adopts raw and auxiliary materials selection → molding, core making → flow coating → box closing → electric furnace smelting → furnace inoculation → silk feeding spheroidal inoculation → pouring inoculation → pouring with flow Breeding→unpacking→cleaning→attached casting sample processing and inspection process preparation.

[0044] The raw and auxiliary materials include pig iron, steel scrap, furnace charge, recarburizer, cored wire, inoculant, new sand, resin, curing agent and heating and heat preservation riser.

[0045] The chemical composition of the pig iron is selected according to the mass fraction of high-quality Q10 pig iron with Si<1%, Mn<0.2%, P<0.03%, and S≤0.02%.

[0046] The steel scrap is high-quality carbon steel scrap with low manganese (Mn<0.10wt%) and low sulfur and phosphorus, such as leftover briquettes for stamping.

[0047] Raw materials must be pur...

Embodiment 2

[0067] The production method of as-cast low-temperature ductile iron according to the present invention adopts raw and auxiliary materials selection → molding, core making → flow coating → box closing → electric furnace smelting → furnace inoculation → silk feeding spheroidal inoculation → pouring inoculation → pouring with flow Breeding→unpacking→cleaning→attached casting sample processing and inspection process preparation.

[0068] The raw and auxiliary materials include pig iron, steel scrap, furnace charge, recarburizer, cored wire, inoculant, new sand, resin, curing agent and heating and heat preservation riser.

[0069] The chemical composition of the pig iron is selected according to the mass fraction of high-quality Q10 pig iron with Si<1%, Mn<0.2%, P<0.03%, and S≤0.02%.

[0070] The steel scrap is high-quality carbon steel scrap with low manganese (Mn<0.10wt%) and low sulfur and phosphorus, such as leftover briquettes for stamping.

[0071] Raw materials must be pur...

Embodiment 3

[0091] The production method of as-cast low-temperature ductile iron according to the present invention adopts raw and auxiliary materials selection → molding, core making → flow coating → box closing → electric furnace smelting → furnace inoculation → silk feeding spheroidal inoculation → pouring inoculation → pouring with flow Breeding→unpacking→cleaning→attached casting sample processing and inspection process preparation.

[0092] The raw and auxiliary materials include pig iron, steel scrap, furnace charge, recarburizer, cored wire, inoculant, new sand, resin, curing agent and heating and heat preservation riser.

[0093] The chemical composition of the pig iron is selected according to the mass fraction of high-quality Q10 pig iron with Si<1%, Mn<0.2%, P<0.03%, and S≤0.02%.

[0094] The steel scrap is high-quality carbon steel scrap with low manganese (Mn<0.10wt%) and low sulfur and phosphorus, such as leftover briquettes for stamping.

[0095] Raw materials must be pur...

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Abstract

The invention belongs to the technical field of casting processes, and particularly relates to a production method of cast-state low-temperature ball iron. The is prepared by adopting the following steps of original auxiliary material selecting->molding and core preparing->flow coating->mold assembling->smelting by an electric furnace->tapping and inoculation->wire feeding spheroidizing inoculation-> inoculant pouring and inoculation->casting and in-stream inoculation->mold dissembling->cleaning->machining of a cast-on sample and inspection procedures. According to the production method of thecast-state low-temperature ball iron, based on a large amount of production practice statistical results for axis housing castings on European trains, the gold-phase sampling spheroidization rate ofa cast-on test block of a product is more than or equal to 90%, and the graphite size is 5-6 grades, the content of ferrite in a matrix is more than or equal to 95%, and no carbide exists; sampling detecting results on tensile strength, elongation and hardness impact value of the cast-on test block all meet the standard specification; and it is ensured that through cooperating proper casting process design, a casting can meets the standard requirements after being inspected by UT, MT and RT flaw detection.

Description

technical field [0001] The invention belongs to the technical field of casting technology, and in particular relates to a production method of as-cast low-temperature ductile iron. Background technique [0002] Due to its high impact toughness at low temperature, low temperature impact ductile iron meets the requirements of equipment in wind power, high-speed rail, nuclear power, chemical industry, water treatment and other fields under harsh working conditions for high performance, high efficiency and high reliability of castings. requirements. However, after more than ten years of rapid and explosive development, the wind power industry is now facing brutal market competition and has entered the post-market era. The spheroidization process is carried out by the flushing method, so the production cost is high, the reject rate is high, and the quality is unstable. [0003] Patents CN101168191A "-20 ℃ low-temperature cast Ni-free ductile iron casting method for megawatt fan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C33/10C21C1/10C21C7/00C22C37/04C22C37/10B22D1/00
CPCB22D1/00C21C1/105C21C7/0006C21C7/0025C21C7/0056C22C33/10C22C37/04C22C37/10Y02P10/20
Inventor 张冬至王峰张兴贤孙茂林段连涛卢会军
Owner 淄博乾能铸造科技股份有限公司
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