CN104878275A - Production technology for ductile iron casting with high strength and high ductility - Google Patents
Production technology for ductile iron casting with high strength and high ductility Download PDFInfo
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Abstract
The invention discloses a production technology for a ductile iron casting with high strength and high ductility. The production technology comprises the following steps: 1, adding 18-22 parts of steel scrap into an electric furnace for smelting, adding 58-62 parts of foundry returns, and finally, adding 0.5 part of a structure modifier and 18-22 parts of pig iron at the same time for smelting, so as to obtain raw molten iron; 2, adding a nodulizing agent into a nodulizing chamber of a nodulizing ladle, and coating the nodulizing agent with a nucleating agent, covering the nucleating agent with a silicon steel sheet, and finally, adding the structure modifier into the nodulizing ladle; 3, enabling the raw molten iron of which the temperature is controlled to be 1460-1480 DEG C in the electric furnace to react in the nodulizing ladle, so as to obtain final molten iron; 4, pouring the final molten iron for casting, and cooling, so as to obtain the ductile iron casting. According to the invention, the burning loss of crystal cores in molten iron can be prevented, the quality of molten iron is improved, and the ductility and strength can be greatly improved.
Description
Technical field
the present invention relates to a kind of production technique of iron casting, particularly a kind of production technique of high-strength high-elongation ratio iron casting.
Background technology
spheroidal graphite cast iron is that the graphite in cast iron presents spherical a kind of cast iron, and by spheroidizing, graphite is formed spherical, this globular graphite can make stress concentration little, reduces isolating matrix.Because the intensity of spheroidal graphite cast iron, degree of moulding, toughness are high, fatigue strength is close to medium carbon steel, and wear resistance is better than non-alloyed steel, and cutting ability can compare favourably with graphitic cast iron, the advantages such as low cost of manufacture, and it receives applies widely.
in the production process of spheroidal graphite cast iron, can form iron liquid by after the melting sources of different ratio, the quality, spheroidization and inoculation treatment effect etc. of iron liquid have conclusive effect to the quality of foundry goods.The quality of iron liquid is good, can more, the less graphite pebbles of quantity of formation and eutectic cell when then solidifying, graphite pebbles and eutectic cell more, more tiny, then expansion stress when foundry goods is formed is larger, thus can more effectively overcome matrix and loosen, improve the mechanical property of spheroidal graphite cast iron.Therefore, the quality of iron liquid and the quality of final spheroidal graphite cast iron have direct relation, the quality of iron liquid again directly and in the proportioning of raw material and raw material the content of each element chemistry component have direct relation.The another one factor affecting spheroidal graphite cast iron quality is nodularization process, and the object of spheroidizing makes spheroidization of graphite, simultaneously except desulfuration and oxygen isoreactivity element.As everyone knows, in the preparation process of spheroidal graphite cast iron, people wish that sulphur content is more low better, generally believe that element sulphur is a kind of harmful element, and its existence can destroy the forming process of graphite forming core, and then affects the mechanical property etc. of spheroidal graphite cast iron; In addition, in nodularization process, spheroidizing reacion speed and whole spheroidizing reacion Time dependent the specific absorption of magnesium, the roundness of graphite, quantity and distribution situation, and these factors can affect the mechanical property of spheroidal graphite cast iron.At present, conventional manufactory is when producing QT600 material, and general unit elongation can only reach 5-7, although reach the standard that in GB, regulation unit elongation is just qualified more than 3, but still is in performance on the low side.
Summary of the invention
the object of the invention is to, a kind of production technique of high-strength high-elongation ratio iron casting is provided.The present invention can not only prevent the scaling loss of crystallization nucleation in molten iron, improves molten steel quality, can also significantly improve unit elongation and intensity.
technical scheme of the present invention: a kind of production technique of high-strength high-elongation ratio iron casting, feature is, carries out in the steps below:
1. in electric furnace, add 18-22 part smelting scrap steel, then add 58-62 part foundry returns, the texturizing agents and the 18-22 part pig iron that finally add 0.5 part carry out melting simultaneously, form base iron;
2. nodularization nodulizing agent being joined nodularization bag is indoor, then covers on nodulizing agent by nucleating agent, then covers on nucleating agent by silieonized plate, is finally added by texturizing agents in nodularization bag;
3. temperature in electric furnace is controlled to pour in nodularization bag the base iron of 1460-1480 DEG C to form whole molten iron after reaction;
4. whole molten iron is poured into casting mold, after cooling, obtain iron casting.
in the production technique of aforesaid high-strength high-elongation ratio iron casting, in described steel scrap, the massfraction of each moiety is respectively Mn≤0.4%, S≤0.02%, P≤0.04%, and surplus is Fe.
in the production technique of aforesaid high-strength high-elongation ratio iron casting, in the described pig iron, the massfraction of each moiety is respectively C:4.1-4.3%, Si:0.1-0.3%, Mn:0.01-0.03%, P :≤0.04, S :≤0.015%, Ti :≤0.02%, and surplus is Fe.
in the production technique of aforesaid high-strength high-elongation ratio iron casting, in described nodulizing agent, the massfraction of each moiety is respectively Mg:5.6-6.2%, AL≤0.8%, Si:0.44-0.48%, Ca:2.85-3.35%, La:0.4-0.6%, and surplus is Fe.
in the production technique of aforesaid high-strength high-elongation ratio iron casting, in described texturizing agents, the massfraction of each moiety is respectively SiC > 95%, Al
2
0
3
< 1.5%, C < 3%, all the other are Si and SiO
2
.
in the production technique of aforesaid high-strength high-elongation ratio iron casting, described step 1. in the grain graininess of texturizing agents be 3-8mm, described step 2. in the grain graininess of texturizing agents be 0.1-0.5mm.
in the production technique of aforesaid high-strength high-elongation ratio iron casting, described nucleating agent is Si-Ca-Ba nucleating agent, and the massfraction of its each moiety is respectively Si:> 65%, Ca:1.5-2.5%, Ba:1.0-2.0%, and surplus is Fe.
in the production technique of aforesaid high-strength high-elongation ratio iron casting, described step 2. in, the add-on of described nodulizing agent is 1.0% of base iron weight; The add-on of described nucleating agent is 0.25% of base iron weight; The add-on of described silieonized plate is 0.5% of base iron weight; The add-on of described texturizing agents is 0.05% of base iron weight.
in the production technique of aforesaid high-strength high-elongation ratio iron casting, in described base iron, the massfraction of each moiety is respectively C:3.9-4.0%, Si:1.8-1.9%, Mn:0.45-0.5%, P :≤0.05, S≤0.02%, Cu:0.35-0.4%, Sn:0.03-0.035%, surplus is Fe.
in the production technique of aforesaid high-strength high-elongation ratio iron casting, in described whole molten iron, the massfraction of each moiety is respectively C:3.75-3.9%, Si:2.35-2.50%, Mn:0.45-0.5%, P :≤0.05, S≤0.15%, Cu:0.35-0.4%, Sn:0.03-0.035%, Mg:0.03-0.05%, surplus is Fe.
compared with prior art, the pig iron finally adds by the present invention when reinforced, prevent the scaling loss of crystallization nucleation in molten iron, improve molten steel quality, texturizing agents is added respectively in fusion process He in spheroidizing process, Graphite Precipitation more more tiny more roundings during promotion nodularization, thus improve unit elongation; Also controlled higher (1.8-1.9%) by the silicone content of base iron, can improve unit elongation further, unit elongation can reach 10-13.Also alloy adding is control effectively to obtain higher intensity (tensile strength can reach 645, and yield strength can reach 402).
Embodiment
below in conjunction with embodiment, the present invention is further illustrated, but not as the foundation limited the present invention.
embodiment.A production technique for high-strength high-elongation ratio iron casting, carry out in the steps below:
1. in electric furnace, add 18-22 part smelting scrap steel, then add 58-62 part foundry returns, the texturizing agents and the 18-22 part pig iron that finally add 0.5 part carry out melting simultaneously, form base iron;
2. nodularization nodulizing agent being joined nodularization bag is indoor, then covers on nodulizing agent by nucleating agent, then covers on nucleating agent by silieonized plate, is finally added by texturizing agents in nodularization bag;
3. temperature in electric furnace is controlled to pour in nodularization bag the base iron of 1460-1480 DEG C to form whole molten iron after reaction;
4. whole molten iron is poured into casting mold, after cooling, obtain iron casting.
time in described base iron to nodularization bag, base iron is not directly flushed on nodulizing agent, measures nodularization explosion time simultaneously, illustrates that spheroidizing reacion is qualified between 55 seconds to 100 seconds.
reasonable, in described steel scrap, the massfraction of each moiety is respectively Mn≤0.4%, S≤0.02%, P≤0.04%, and surplus is Fe.In the described pig iron (high-purity pig iron), the massfraction of each moiety is respectively C:4.1-4.3%, Si:0.1-0.3%, Mn:0.01-0.03%, P :≤0.04, S :≤0.015%, Ti :≤0.02%, and surplus is Fe.In described nodulizing agent, the massfraction of each moiety is respectively Mg:5.6-6.2%, AL≤0.8%, Si:0.44-0.48%, Ca:2.85-3.35%, La:0.4-0.6%, and surplus is Fe.In described texturizing agents (also claiming silicon carbide), the massfraction of each moiety is respectively SiC > 95%, Al
2
0
3
< 1.5%, C < 3%, all the other are Si and SiO
2
.
described step 1. in the grain graininess of texturizing agents be 3-8mm, described step 2. in the grain graininess of texturizing agents be 0.1-0.5mm.Described nucleating agent is Si-Ca-Ba nucleating agent, and the massfraction of its each moiety is respectively Si:> 65%, Ca:1.5-2.5%, Ba:1.0-2.0%, and surplus is Fe.
described step 2. in, the add-on of described nodulizing agent is 1.0% of base iron weight; The add-on of described nucleating agent is 0.25% of base iron weight; The add-on of described silieonized plate is 0.5% of base iron weight; The add-on of described texturizing agents is 0.05% of base iron weight.
in described base iron, the massfraction of each moiety is respectively C:3.9-4.0%, Si:1.8-1.9%, Mn:0.45-0.5%, P :≤0.05, S≤0.02%, Cu:0.35-0.4%, Sn:0.03-0.035%, and surplus is Fe.In described whole molten iron, the massfraction of each moiety is respectively C:3.75-3.9%, Si:2.35-2.50%, Mn:0.45-0.5%, P :≤0.05, S≤0.15%, Cu:0.35-0.4%, Sn:0.03-0.035%, Mg:0.03-0.05%, and surplus is Fe.
be more preferably, step 2. in, add and cover on silieonized plate by the texturizing agents of 0.05% of weight of tapping a blast furnace (silicon carbide) half, second half joins opposite, nodularization room.The pig iron finally adds by the present invention when reinforced, prevent the scaling loss of crystallization nucleation in molten iron, improve molten steel quality, in fusion process He in spheroidizing process, add texturizing agents respectively, Graphite Precipitation more more tiny more roundings during promotion nodularization, thus improve unit elongation; Also controlled higher (1.8-1.9%) by the silicone content of base iron, can improve unit elongation further, unit elongation can reach 10-13.
the present invention obtains by experiment:
| Former silicone content | Nodulizing agent | Nucleating agent | Silicon carbide | Tensile strength | Yield strength | Unit elongation |
| 1.45% | 1.0% | 0.6% | 0 | 654 | 415 | 7 |
| 1.51% | 1.0% | 0.6% | 0 | 660 | 395 | 6 |
| 1.48% | 1.0% | 0.6% | 0 | 635 | 425 | 4 |
| 1.86% | 1.0% | 0.25% | 0.05% | 645 | 395 | 12 |
| 1.83% | 1.0% | 0.25% | 0.05% | 612 | 402 | 11 |
| 1.88% | 1.0% | 0.25% | 0.05% | 635 | 388 | 11 |
therefrom can draw, the present invention is when controlling higher (1.8-1.9%) by the silicone content of base iron, and to carry out rational proportion with other auxiliary materials be to ensure stronger intensity, significantly can also promote unit elongation, thus enhance product performance.
Claims (10)
1. a production technique for high-strength high-elongation ratio iron casting, is characterized in that, carries out in the steps below:
1. in electric furnace, add 18-22 part smelting scrap steel, then add 58-62 part foundry returns, the texturizing agents and the 18-22 part pig iron that finally add 0.5 part carry out melting simultaneously, form base iron;
2. nodularization nodulizing agent being joined nodularization bag is indoor, then covers on nodulizing agent by nucleating agent, then covers on nucleating agent by silieonized plate, is finally added by texturizing agents in nodularization bag;
3. temperature in electric furnace is controlled to pour in nodularization bag the base iron of 1460-1480 DEG C to form whole molten iron after reaction;
4. whole molten iron is poured into casting mold, after cooling, obtain iron casting.
2. the production technique of high-strength high-elongation ratio iron casting according to claim 1, is characterized in that: in described steel scrap, the massfraction of each moiety is respectively Mn≤0.4%, S≤0.02%, P≤0.04%, surplus is Fe.
3. the production technique of high-strength high-elongation ratio iron casting according to claim 1, it is characterized in that: in the described pig iron, the massfraction of each moiety is respectively C:4.1-4.3%, Si:0.1-0.3%, Mn:0.01-0.03%, P :≤0.04, S :≤0.015%, Ti :≤0.02%, surplus is Fe.
4. the production technique of high-strength high-elongation ratio iron casting according to claim 1, is characterized in that: in described nodulizing agent, the massfraction of each moiety is respectively Mg:5.6-6.2%, AL≤0.8%, Si:0.44-0.48%, Ca:2.85-3.35%, La:0.4-0.6%, surplus is Fe.
5. the production technique of high-strength high-elongation ratio iron casting according to claim 1, is characterized in that: in described texturizing agents, the massfraction of each moiety is respectively SiC > 95%, Al
20
3< 1.5%, C < 3%, all the other are Si and SiO
2.
6. the production technique of high-strength high-elongation ratio iron casting according to claim 1, is characterized in that: described step 1. in the grain graininess of texturizing agents be 3-8mm, described step 2. in the grain graininess of texturizing agents be 0.1-0.5mm.
7. the production technique of high-strength high-elongation ratio iron casting according to claim 1, it is characterized in that: described nucleating agent is Si-Ca-Ba nucleating agent, the massfraction of its each moiety is respectively Si:> 65%, Ca:1.5-2.5%, Ba:1.0-2.0%, surplus is Fe.
8. the production technique of high-strength high-elongation ratio iron casting according to claim 1, is characterized in that: described step 2. in, the add-on of described nodulizing agent is 1.0% of base iron weight; The add-on of described nucleating agent is 0.25% of base iron weight; The add-on of described silieonized plate is 0.5% of base iron weight; The add-on of described texturizing agents is 0.05% of base iron weight.
9. the production technique of the high-strength high-elongation ratio iron casting according to any one of claim 1-8, it is characterized in that: in described base iron, the massfraction of each moiety is respectively C:3.9-4.0%, Si:1.8-1.9%, Mn:0.45-0.5%, P :≤0.05, S≤0.02%, Cu:0.35-0.4%, Sn:0.03-0.035%, surplus is Fe.
10. the production technique of the high-strength high-elongation ratio iron casting according to any one of claim 1-8, it is characterized in that: in described whole molten iron, the massfraction of each moiety is respectively C:3.75-3.9%, Si:2.35-2.50%, Mn:0.45-0.5%, P :≤0.05, S≤0.15%, Cu:0.35-0.4%, Sn:0.03-0.035%, Mg:0.03-0.05%, surplus is Fe.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105886693A (en) * | 2016-05-16 | 2016-08-24 | 江苏力源金河铸造有限公司 | Smelting method for medium-strength and high-ductility ductile cast iron |
| CN106513650A (en) * | 2016-11-28 | 2017-03-22 | 西峡县西泵特种铸造有限公司 | Ladle pressing technology capable of preventing nodulizing agent from sticking to ladle |
| CN107475605A (en) * | 2017-10-18 | 2017-12-15 | 湖州正德轻工机械有限公司 | A kind of heat treatment method of hi-strength nodular iron casting |
| CN107699786A (en) * | 2017-10-18 | 2018-02-16 | 湖州正德轻工机械有限公司 | A kind of low ductile alloy iron castings |
| CN107699778A (en) * | 2017-10-18 | 2018-02-16 | 湖州正德轻工机械有限公司 | A kind of production method of inexpensive spheroidal graphite cast-iron |
| CN107723584A (en) * | 2017-10-18 | 2018-02-23 | 湖州正德轻工机械有限公司 | A kind of hi-strength nodular iron casting |
| CN107755623A (en) * | 2017-10-27 | 2018-03-06 | 湖州正德轻工机械有限公司 | Automobile clutch pressure plate casting method |
| CN111500923A (en) * | 2020-05-20 | 2020-08-07 | 天津三和铁制品有限公司 | Thick-wall nodular cast iron and preparation method thereof |
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| CN103882175A (en) * | 2014-03-31 | 2014-06-25 | 江苏力源金河铸造有限公司 | Method for producing two brand numbers of low-temperature ductile irons by adopting molten iron |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105886693A (en) * | 2016-05-16 | 2016-08-24 | 江苏力源金河铸造有限公司 | Smelting method for medium-strength and high-ductility ductile cast iron |
| CN105886693B (en) * | 2016-05-16 | 2017-11-03 | 江苏力源金河铸造有限公司 | A kind of method of smelting of moderate strength high-elongation magnesium iron |
| CN106513650A (en) * | 2016-11-28 | 2017-03-22 | 西峡县西泵特种铸造有限公司 | Ladle pressing technology capable of preventing nodulizing agent from sticking to ladle |
| CN107475605A (en) * | 2017-10-18 | 2017-12-15 | 湖州正德轻工机械有限公司 | A kind of heat treatment method of hi-strength nodular iron casting |
| CN107699786A (en) * | 2017-10-18 | 2018-02-16 | 湖州正德轻工机械有限公司 | A kind of low ductile alloy iron castings |
| CN107699778A (en) * | 2017-10-18 | 2018-02-16 | 湖州正德轻工机械有限公司 | A kind of production method of inexpensive spheroidal graphite cast-iron |
| CN107723584A (en) * | 2017-10-18 | 2018-02-23 | 湖州正德轻工机械有限公司 | A kind of hi-strength nodular iron casting |
| CN107755623A (en) * | 2017-10-27 | 2018-03-06 | 湖州正德轻工机械有限公司 | Automobile clutch pressure plate casting method |
| CN111500923A (en) * | 2020-05-20 | 2020-08-07 | 天津三和铁制品有限公司 | Thick-wall nodular cast iron and preparation method thereof |
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