CN105537524A

CN105537524A - Preparation process of cast steel insulated feeder covering agent

Info

Publication number: CN105537524A
Application number: CN201510929614.2A
Authority: CN
Inventors: 李玲
Original assignee: Individual
Current assignee: Individual
Priority date: 2015-12-15
Filing date: 2015-12-15
Publication date: 2016-05-04

Abstract

The invention discloses a preparation process of a cast steel insulated feeder covering agent. The cast steel feeder covering agent is prepared by 4-8 wt% of aluminum powder, 25-354 wt% of coal ash, 15-18 wt% of perlite, 14-18 wt% of acidized graphite, 10-15 wt% of carbon powder, 2-3 wt% of triggering agent and 8-22 wt% of other materials. The prepared covering agent has dual effects of heating and thermal insulation, can obviously improve the feeder feeding capacity, reduces effective feeder height, saves molten steel, improves the casting quality and yield, and is an effective cast steel feeder covering agent worthy of popularization and application.

Description

The configuration technique of cast steel insulated feeder coverture

Technical field

The present invention relates to a kind of configuration technique of cast steel insulated feeder coverture.

Background technology

Casting manufactures complex parts methods the most flexibly, while the application of advanced foundry engieering brings new vitality to process industry, also makes foundry industry encounter from the inside and outside huge challenge of casting industry.In China, casting has long history, uses Steel Casting Risers coverture from the age, and the development of it and continuous casting technology is maintained close ties with.

At present, in factor controllable in note process as around note temperature, around note speed, few around injecting method etc., and the rich note of protection is one of the effective ways improving steel also quality.Before the rich note of use Steel Casting Risers coverture, common protection casting measure of having mercy on also adopts the casting of vegetable oil lubrication.At the beginning of the sixties, by the inspiration of wash heat method, once the rich note of the clear protection of liquid was adopted to some steel grade, obtained good effect.From then on, with the rich note of Steel Casting Risers coverture just pay close attention to by numerous research workers, in addition because the Steel Casting Risers coverture raw material used refractory material that to be mostly cost lower or discarded, also this technology is made to have larger market prospects, it impels research workers to study intensively to this respect, thus has promoted the development that this technology follows continuous casting and foundry engieering closely.

Since the sixties in 20th century, external continuous casting starts to adopt powder Steel Casting Risers coverture to cast.In history for many years, about the research in this field is never interrupted.The period that the seventies is continuous casting, the investigation and application of Steel Casting Risers coverture relatively enlivens, since the eighties, has been want to adapt to the needs that various different cultivars develops to the requirement of Steel Casting Risers coverture.Set about from the chemical composition changing Steel Casting Risers coverture the physicochemical property improving Steel Casting Risers coverture, thus reach best resultant effect.Improving constantly and developing along with foundry engieering, and the energy problem becoming serious, casting industry itself must have and develops faster in technological development and Quality advance.In foundry production, how to ensure that the quality of foundry goods seems more and more important.In order to ensure the quality of foundry goods, common practices arranges rising head, this reduces the product yield of foundry goods, according to modulus calculation, casting alloy needs the rising head identical with foundry goods volume to carry out feeding usually, this just means that the metal of in Foundry Production nearly 50% will carry out again flame refining, and so big waste forces foundry enterprise to have to seek the improvement of novel process.

At present, more general mode is adopted to be that insulated feeder is set, its Main Function ensures that casting alloy is in the process of solidifying, slow down the setting rate of liquid metal in rising head, thus improve its feeding capacity, while guarantee casting quality, the height of rising head can be effectively reduced, improve casting process yield with this.Its heat preservation principle delays the setting time of rising head molten steel, the feeding effect of strengthening rising head by the thermal loss of rising head side in the control unit interval.This not only can save the consumption of riser metal liquid, and to raising casting quality important in inhibiting.It can delay the cool time of liquid metal significantly, avoids cast-internal to produce shrinkage cavity, the phenomenons such as shrinkage porosite, improves the product yield of foundry goods.But insulated feeder so reduces the thermal loss of rising head side greatly, but but cannot make up the heat loss at rising head top, according to the interrelated data display thermal loss at rising head top and the suitable of rising head side.

Summary of the invention

The object of the present invention is to provide a kind of configuration technique of cast steel insulated feeder coverture, to solve the problem proposed in above-mentioned background technology.

For achieving the above object, the invention provides following technical scheme: the configuration technique of cast steel insulated feeder coverture, the proportioning of Steel Casting Risers coverture is, aluminium powder 4-8wt%, flyash 25-354wt%, perlite 15-18wt%, acidifying graphite 14-18wt%, carbon dust 10-15wt%, triggering agent 2-3wt%, other materials 8-22wt%.

As a further improvement on the present invention, described other materials comprises fluorite, CaO, Li ₂cO ₃, graphite, active carbon, its proportioning is 1:1:3.

As a further improvement on the present invention, described triggering agent is halide.

Compared with prior art, the invention has the beneficial effects as follows: the coverture of the present invention's configuration has the double action of heat and insulation, the feeding capacity of rising head can be improved significantly, reduce the effective depth of rising head, save molten steel, improving quality and the yield rate of foundry goods, is a kind of effective Steel Casting Risers coverture be worthy of popularization.

Detailed description of the invention

Be clearly and completely described the technical scheme in the embodiment of the present invention below, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention

In coverture, acidifying graphite and the heat-insulating property of perlitic content on coverture have obvious impact.Along with the increase of acidifying graphite content, the expansion effect of coverture obviously increases, and heat insulation effect is become better and better.But after acidifying graphite content is more than 18wt%, the expansion multiple of coverture increases to 2-6 doubly, and heat-insulating property slowly reduces.So acidifying graphite addition is too much unsuitable, is advisable with 14-18wt%.Perlitic heat-insulating property is better, and along with content perlitic in coverture raises, the heat-insulating property of coverture also improves gradually, and the viscosity of coverture is more and more higher, but its content is more than after 20wt%, and the heat-insulating property of coverture is also slowly deteriorated.Therefore, perlite can with expanded vermiculite with the use of, be conducive to like this improving the heat insulation effect of coverture.

Aluminium powder has good heating effect in coverture.Along with the increase of content of aluminium powder in coverture, the heating effect of coverture increases, and heating peak temperature improves, but the heat-insulating property of coverture decreases, and ' cost of coverture also increases order.Therefore, in coverture, the content of aluminium powder is advisable with 4-8wt%.

In order to better improve heat-insulating property and the calorific capacity of coverture, by adding quantitative carbon dust and other slag liquid formation material, regulate the fusing time of coverture, the factors such as fusion temperature, viscosity, basicity.

Pass through orthogonal test, the proportioning of Steel Casting Risers coverture can be optimized for: aluminium powder 4-8wt%, flyash 25-354wt%, perlite 15-18wt%, acidifying graphite 14-18wt%, carbon dust 10-15wt%, triggering agent 2-3wt%, other materials 8-22wt%, other materials comprises fluorite, CaO, Li ₂cO ₃, graphite, active carbon, its proportioning is 1:1:3, trigger agent be halide.

Although illustrate and describe embodiments of the invention, for the ordinary skill in the art, be appreciated that and can carry out multiple change, amendment, replacement and modification to these embodiments without departing from the principles and spirit of the present invention, scope of the present invention is by claims and equivalents thereof.

Claims

1. the configuration technique of cast steel insulated feeder coverture, it is characterized in that: the proportioning of Steel Casting Risers coverture is, aluminium powder 4-8wt%, flyash 25-354wt%, perlite 15-18wt%, acidifying graphite 14-18wt%, carbon dust 10-15wt%, triggering agent 2-3wt%, other materials 8-22wt%.

2. the configuration technique of cast steel insulated feeder coverture according to claim 1, is characterized in that described other materials comprises fluorite, CaO, Li ₂cO ₃, graphite, active carbon, its proportioning is 1:1:3.

3. the configuration technique of cast steel insulated feeder coverture according to claim 1, is characterized in that described triggering agent is halide.