阅读说明：本技术 一种抗衰退合成球墨铸铁用孕育剂 (Inoculant for anti-fading synthesis of nodular cast iron ) 是由 龚连金 李保全 朱昊 孙佳 蒋存红 于 2020-07-28 设计创作，主要内容包括：本发明公开了一种抗衰退合成球墨铸铁用孕育剂,涉及孕育剂技术领域。本发明孕育剂以重量百分比包括：稀土元素:0.4-0.6％、Ba:2.5-3.5％、Ca1.5-2.0％、Sb:1-1.5％、Si:65-70％、其余为铁和难以除去的杂质；本发明制备方法,包括：根据孕育剂的配方比计算并称取各原材料；将称取原材料投入熔炼炉中进行熔炼；将熔炼产物破碎成粒度1-3mm即可。本发明孕育剂主要应用于合成铸铁方式生产球墨铸铁,本孕育剂在浇注包内添加,可有效增加石墨球数,同时抑制变异石墨的形成,提高石墨球的圆整度。(The invention discloses an inoculant for anti-fading synthesis of nodular cast iron, and relates to the technical field of inoculants. The inoculant comprises the following components in percentage by weight: 0.4-0.6% of rare earth elements, 2.5-3.5% of Ba, 1.5-2.0% of Ca1.5, 1-1.5% of Sb, 65-70% of Si, and the balance of Fe and impurities difficult to remove; the preparation method comprises the following steps: calculating and weighing the raw materials according to the formula ratio of the inoculant; putting the weighed raw materials into a smelting furnace for smelting; and crushing the smelting product into particles with the particle size of 1-3 mm. The inoculant is mainly applied to the production of nodular cast iron in a synthetic cast iron mode, and is added into a pouring ladle, so that the number of graphite nodules can be effectively increased, the formation of the mutated graphite is inhibited, and the roundness of the graphite nodules is improved.)

1. An inoculant for anti-fading synthesis of nodular cast iron is characterized in that: comprises the following components in percentage by weight:

0.4-0.6% of rare earth elements, 2.5-3.5% of Ba, 1.5-2.0% of Ca1.5, 1-1.5% of Sb, 65-70% of Si, and the balance of Fe and impurities difficult to remove.

2. The inoculant for the anti-fading synthetic nodular cast iron according to claim 1, comprising, in weight percent:

0.5% of rare earth elements, 3% of Ba, 1.7% of Ca1.7%, 1.2% of Sb, 67% of Si, and the balance of Fe and impurities difficult to remove.

3. The inoculant for the anti-fading synthetic nodular cast iron according to claim 1, comprising, in weight percent:

0.45% of rare earth elements, 2.5% of Ba, 1.5% of Ca1, 1% of Sb, 70% of Si, and the balance of Fe and impurities difficult to remove.

4. The inoculant for the anti-fading synthetic spheroidal graphite cast iron according to any one of claims 1 to 3, wherein the particle size of the inoculant is required to be 1-3 mm.

5. The inoculant for the anti-fading synthetic nodular cast iron according to the claims 1 to 3, wherein the inoculant is added into a pouring ladle in an amount of 0.2 +/-0.05% of the weight of molten iron in the pouring ladle.

6. The inoculant for the anti-decay synthetic spheroidal graphite cast iron according to any one of claims 1 to 3, wherein the content of impurities is lower than 0.02% by weight.

7. The preparation method of the inoculant for the anti-fading synthesis of the nodular cast iron is characterized by comprising the following steps:

step 1, calculating and weighing raw materials according to the formula ratio of the inoculant;

step 2, putting the weighed raw materials into a smelting furnace for smelting;

and 3, crushing the smelting product into particles with the particle size of 1-3 mm.

8. The method for preparing the inoculant for the anti-fading synthesis of spheroidal graphite cast iron according to claim 7, wherein the raw materials comprise rare earth, ferrosilicon, barium iron and antimony iron.

9. The method for preparing the inoculant for the anti-fading synthesis of nodular cast iron as claimed in claim 7, wherein the ferrosilicon has a particle size of 5-15 mm; the Si content in the ferrosilicon is more than or equal to 87 percent, and the Ca content is lower than 1.5 percent;

the barium and iron content is 6-7%, the iron content is 35-45%, the calcium content is 1-10% and a small amount of other impurities;

the main component of the antimony-iron is antimony trioxide, the content of the antimony trioxide is more than or equal to 99%, and a small amount of impurities.

10. The method as claimed in claim 7, wherein the rare earth is at least one selected from cerium, neodymium, lanthanum, terbium and yttrium.

Technical Field

The invention belongs to the technical field of inoculants, and particularly relates to an anti-fading inoculant for synthesizing nodular cast iron.

Background

With the development of the automobile industry, the automobile production is greatly increased, and the leftover material resources of automobile covering parts are quite abundant, so that the resource recycling is improved. The main smelting materials of the ductile iron production process are scrap steel and foundry returns, the production is carried out by using a carburant recarburization mode, and the main materials are changed compared with the original pig iron and foundry returns production process; compared with the traditional cast iron production, the synthetic cast iron uses a large amount of scrap steel, and the strength and the elongation of the synthetic cast iron are higher than those of the cast iron produced by the traditional production process. The production process mainly adopts a large amount of scrap steel, along with the industrial upgrading of the steel plate, harmful elements such as sulfur, phosphorus and the like in the steel plate are extremely low, the harmful elements in the smelted base iron are extremely low, the mechanical property of cast iron is improved, and the guarantee capability is improved.

The production of nodular cast iron needs nodulizing and inoculation, which is consistent with the traditional production process, nodulizing agent is mainly added in the nodulizing process to promote the graphite of the cast iron to be converted into lumps and spheres from the conventional flakes, liquid metal is solidified into ductile cast iron, inoculation refers to the process of adding different alloys (mainly Si-based alloys) to promote graphitization in the solidification process, increase cores and reduce the size of dendrites, and the purpose of inoculation is to improve the metallurgical quality of the cast iron.

The synthetic cast iron is adopted, because the steel plate is adopted as a raw material (the foundry returns are casting heads of products after the synthetic cast iron is smelted and poured), because the purity of the steel plate is high, the capability of forming graphite cores is weak, inoculation is very important for the synthetic cast iron, and the final performance of the products is related. The variety of the inoculant is very many, and the inoculant meeting the production requirement is designed to be a proper benefit according to the product structure and the site smelting working condition, so that the comprehensive mechanical property of the product is better.

Disclosure of Invention

The invention aims to provide an inoculant for anti-fading synthesis of nodular cast iron, which is mainly applied to production of the nodular cast iron in a mode of synthesizing the nodular cast iron.

In order to solve the technical problems, the invention is realized by the following technical scheme:

the invention relates to an inoculant for anti-fading synthesis of nodular cast iron, which comprises the following components in percentage by weight:

0.4-0.6% of rare earth elements, 2.5-3.5% of Ba, 1.5-2.0% of Ca1.5, 1-1.5% of Sb, 65-70% of Si, and the balance of Fe and impurities difficult to remove.

Further, the composite material comprises the following components in percentage by weight:

0.5% of rare earth elements, 3% of Ba, 1.7% of Ca1.7%, 1.2% of Sb, 67% of Si, and the balance of Fe and impurities difficult to remove.

Further, the composite material comprises the following components in percentage by weight:

0.45% of rare earth elements, 2.5% of Ba, 1.5% of Ca1, 1% of Sb, 70% of Si, and the balance of Fe and impurities difficult to remove.

Further, the particle size of the inoculant is required to be 1-3 mm.

Further, the inoculant is used for being added into a pouring ladle, and the adding amount of the inoculant is 0.2 +/-0.05 percent of the weight of the molten iron in the pouring ladle.

Further, the content of the impurities is less than 0.02% by weight.

A preparation method of an inoculant for anti-fading synthesis of nodular cast iron comprises the following steps:

step 1, calculating and weighing raw materials according to the formula ratio of the inoculant;

step 2, putting the weighed raw materials into a smelting furnace for smelting;

and 3, crushing the smelting product into particles with the particle size of 1-3 mm.

Further, the raw materials include rare earth, ferrosilicon, barium iron, and antimony iron.

Further, the granularity of the ferrosilicon is 5-15 mm; the Si content in the ferrosilicon is more than or equal to 87 percent, and the Ca content is lower than 1.5 percent;

the barium and iron content is 6-7%, the iron content is 35-45%, the calcium content is 1-10% and a small amount of other impurities;

the main component of the antimony-iron is antimony trioxide, the content of the antimony trioxide is more than or equal to 99%, and a small amount of impurities.

Further, the rare earth is at least one selected from cerium, neodymium, lanthanum, terbium and yttrium.

The invention has the following beneficial effects:

the inoculant is mainly applied to the production of nodular cast iron in a synthetic cast iron mode, and the inoculant is added into a pouring ladle, so that the number of graphite nodules can be effectively increased, the formation of the variation graphite is inhibited, and the roundness of the graphite nodules is improved.

Of course, it is not necessary for any product in which the invention is practiced to achieve all of the above-described advantages at the same time.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.