CN102400032A - Large-cross-section nodular cast iron - Google Patents
Large-cross-section nodular cast iron Download PDFInfo
- Publication number
- CN102400032A CN102400032A CN2011103291058A CN201110329105A CN102400032A CN 102400032 A CN102400032 A CN 102400032A CN 2011103291058 A CN2011103291058 A CN 2011103291058A CN 201110329105 A CN201110329105 A CN 201110329105A CN 102400032 A CN102400032 A CN 102400032A
- Authority
- CN
- China
- Prior art keywords
- cast iron
- graphite cast
- big section
- section nodular
- surplus
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Abstract
The invention discloses large-cross-section nodular cast iron, belonging to the technical field of cast iron metallurgy and overcoming the defect that the nodular cast iron in the prior art cannot meet requirements of castings of high-impact machine dies due to poorer mechanical property. The large-cross-section nodular cast iron disclosed by the invention consists of the following components in percentage by mass: 3.5-3.7 percent of C, 1.8-1.9 percent of Si, 0.1-0.2 percent of Mn, 0.045-0.05 percent of P, 0.01-0.015 percent of S, 0.018-0.02 percent of Re, 0.05-0.055 percent of Mg, 0.5 percent of Cu and the balance of Fe and inevitable trace elements. The large-cross-section nodular cast iron has the advantages of high tenacity and higher ferrite quantity and nodularization ratio and is particularly suitable for various castings of high-strength and high-impact machine dies.
Description
Technical field
The present invention relates to the cast iron materials technical field, relate in particular to a kind of big section nodular graphite cast iron.
Background technology
Spheroidal graphite cast iron is to obtain SG through nodularization and inoculation, and it has improved the mechanical property of cast iron effectively, has particularly improved plasticity and toughness, thereby obtains the intensity also higher than carbon steel.Spheroidal graphite cast iron is 20th century a kind of meehanite cast iron materials of growing up of the fifties, and its over-all properties approaches steel, just is being based on its excellent performance, has been successfully used to cast some stressed complicacies, the part that intensity, toughness, wear resistance are had relatively high expectations.Spheroidal graphite cast iron developed rapidly for be only second to graphitic cast iron, use cast iron materials very widely.
Big section nodular cast iron is meant template thickness greater than the used nodular cast iron of 100 millimeters spheroidal graphite casting, and it is mainly used in the machine tool foundry goods of some high impact forces, high workload intensity, for example the injection moulding machine foundry goods.Existing big section nodular cast iron makes the foundry goods center graphite morphology, spheroidal graphite number occur and reduces to cause cast properties to descend because section is blocked up, and speed of cooling is slow, when serious, even can cause foundry goods to scrap.
Summary of the invention
Technical problem to be solved by this invention is that the above-mentioned deficiency to prior art proposes a kind of H.T., and ferrite content and nodularization rate are all very high and have a big section nodular graphite cast iron of high-elongation.
The technical scheme that the present invention solves its technical problem employing is to propose a kind of big section nodular graphite cast iron, and its mass percent is: C:3.5%-3.7%, Si:1.8%-1.9%; Mn:0.1%-0.2%, P:0.045%-0.05%, S:0.01%-0.015%; Re:0.018%-0.02%; Mg:0.05%-0.055%, Cu:0.5%, surplus is Fe and inevitably micro-.
Further, said big section nodular graphite cast iron mass percent is: C:3.5%, and Si:1.8%, Mn:0.1%, P:0.045%, S:0.01%, Re:0.018%, Mg:0.05%, Cu:0.5%, surplus is Fe and inevitably micro-.
Further, the mass percent of said big section nodular graphite cast iron is: C:3.6%, Si:1.85%, Mn:0.15%; P:0.048%, S:0.01%, Re:0.019%; Mg:0.052%, Cu:0.5%, surplus is Fe and inevitably micro-.
Further, the mass percent of said big section nodular graphite cast iron is: C:3.7%, and Si:1.9%, Mn:0.2%, P:0.05%, S:0.015%, Re:0.02%, Mg:0.055%, Cu:0.5%, surplus is Fe and inevitably micro-.
Further, the raw material of said big section nodular graphite cast iron is coke, Wingdale, the new pig iron, foundry return, steel scrap and iron alloy.
Further, said coke composition is: S:0.1%-0.4%, and ash: 1%-10%, moisture content: 1%-5%, volatile matter: 0.1%-1.5%, surplus is a fixed carbon.
Further, said Wingdale composition is: SiO
2: 0.1%-1.6%, MgO:0.1%-2.5%, surplus is CaO.
Further, the composition of said foundry return is: C:3.60%-3.80%, and Si:2.0%-2.5%, Mn:0.01%-0.2%, P:0.01%-0.05%, S:0.01%-0.03%, surplus is Fe and inevitably micro-.
Further, said steel scrap composition is: C:0.1%-0.3%, and Mn:0.1%-0.3%, P:0.01%-0.03%, surplus is Fe and inevitably micro-.
Embodiment
The big section nodular graphite cast iron main composition of the present invention element is: C, Si, Mn, P, S, Re, Mg, Cu, Fe, the raw material of above-mentioned element come from coke, Wingdale, the new pig iron, foundry return, steel scrap and iron alloy.Wherein, the composition of coke is: S:0.1%-0.4%, and ash: 1%-10%, moisture content: 1%-5%, volatile matter: 0.1%-1.5%, surplus is a fixed carbon; The composition of Wingdale is: SiO
2: 0.1%-1.6%, MgO:0.1%-2.5%, surplus is CaO; The new pig iron is meant carbon content greater than 2% iron-carbon, and it is through forming iron ore through blast-furnace smelting, and wherein the carbon content of the industrial new pig iron and contains elements such as Mn, Si, P, S generally between 2.5%-4.5%; Steel scrap is meant carbon steel, and its staple is: C:0.1%-0.3%, and Mn:0.1%-0.3%, P:0.01%-0.03%, surplus is Fe and inevitably micro-; Foundry return is meant the waste casting that produces behind the big section nodular graphite cast iron of the present invention smelting, and utilizes foundry return can practice thrift cost as the raw material of smelting spheroidal graphite cast iron once more, reaches the effect of recycle; The composition of foundry return is: C:3.60%-3.80%; Si:2.0%-2.5%, Mn:0.01%-0.2%, P:0.01%-0.05%; S:0.01%-0.03%, surplus is Fe and inevitably micro-.
Embodiment one
The mass percent of big section nodular graphite cast iron is in the present embodiment: C:3.5%, and Si:1.8%, Mn:0.1%, P:0.045%, S:0.01%, Re:0.018%, Mg:0.05%, Cu:0.5%, surplus is Fe and inevitably micro-.
Embodiment two
The mass percent of big section nodular graphite cast iron is in the present embodiment: C:3.6%, and Si:1.85%, Mn:0.15%, P:0.048%, S:0.01%, Re:0.019%, Mg:0.052%, Cu:0.5%, surplus is Fe and inevitably micro-.
Embodiment three
The mass percent of big section nodular graphite cast iron is in the present embodiment: C:3.7%, and Si:1.9%, Mn:0.2%, P:0.05%, S:0.015%, Re:0.02%, Mg:0.055%, Cu:0.5%, surplus is Fe and inevitably micro-.
In each component of spheroidal graphite cast iron, C, Si, P, Mn, S are that spheroidal graphite cast iron is often deposited five elements.C is the essentially consist element of spheroidal graphite cast iron, improves carbon content and can reduce shrinkage porosite volume and shrinkage porosite area, makes foundry goods fine and close.But carbon content is too high, and then to reduce the shrinkage porosite effect not obvious, occurs serious graphite floatation on the contrary, and also will increase for the needed remaining Mg amount of the nodularization that guarantees graphite.
The Si element can reduce the solubleness of carbon in liquid and solid iron, promotes separating out of graphite, is to promote graphited element, therefore increases the quantity that the silicon amount can increase graphite, also can make graphite thick; Otherwise, reduce the silicon amount, can make graphite tiny.Generally speaking, when the carbon silicone content hanged down, spheroidal graphite cast iron can obtain higher physical strength and hardness, but flowability is poor slightly; Otherwise, when the carbon silicone content is high, the spheroidal graphite cast iron good fluidity, physical strength and hardness are lower.When needs were made big section nodular graphite cast iron, because template thickness is thicker, thick-walled casting was prone to thick graphite, should reduce the carbon silicone content this moment to reach the purpose that improves physical strength and hardness.
The Mn element is to hinder graphited element, increases the manganese amount and can increase the perlite quantity in the matrix.During but the Mn element has with the deleterious effect of element sulphur, the effect of stable and refine pearlite.In the content range of Mn element 0.1%-0.2% of the present invention, for the casting of big section nodular graphite cast iron, the Mn element is stable austenite and perlite strongly, cast iron intensity is increased but the toughness reduction.
Though the S element also be spheroidal graphite cast iron often deposit one of five elements, this is because the influence of raw material itself.The S element is a harmful element, can stop greying, should its content be controlled at below 0.15%, and the S constituent content is 0.01%-0.015% among the present invention, and it is to the influence of spheroidal graphite cast iron and very little.
The P element also is considered to harmful element usually, can not promote greying, too high phosphoric even can make the shrinkage cavity, shrinkage porosite of cast iron and tearing tendency increase, but the phosphoric of trace its can increase the flowability and the castability of cast iron.
The Cu element can promote the greying in eutectic stage, makes dense structure, and refinement and improve the uniform distribution of graphite; It can reduce the chilling tendency of cast iron; Can reduce the austenitic transformation critical temperature again, refinement is advanced perlite with increasing, to the favourable influence of sensitivity profile.Behind the copper of the present invention through interpolation 0.5% mass percent, the spheroidal graphite cast iron tensile strength and the ys that prepare improve a lot.
Mg element and REE all are the elements that promotes nodularization, and it can strengthen the spheroidization of nodulizing agent in the spheroidal graphite cast iron production process.
Above-mentioned big section nodular graphite cast iron is to make through following method:
(1) raw material melting; Prescription by above-mentioned each embodiment takes by weighing coke, Wingdale, steel scrap, the new pig iron, foundry return and iron alloy and drops in the cupola furnace in order; Preheating began melting after 20 minutes; Guarantee in the fusion process that molten iron temperature is 1450 ° to 1500 °; Detect in the molten iron each constituent content after the melting and adjust each constituent content until meeting the prescription requirement, treating in the hot metal ladle that iron water amount taps a blast furnace when reaching required weight carries out spheroidizing;
(2) spheroidizing and the inoculation first time; Adding total mass in nodularization bag one side is first nodulizing agent and second nodulizing agent of 1.9%-2.0% of iron liquid quality of coming out of the stove; Wherein first nodulizing agent accounts for 40% of all nodulizing agent quality; Second nodulizing agent accounts for 60% of all nodulizing agent quality; First nodulizing agent is down, and second nodulizing agent is last and on second nodulizing agent, to go back covering quality be equivalent to come out of the stove 0.25%-0.35%, the granularity of iron liquid quality be the nucleating agent of 15-30 millimeter, behind the iron liquid of the coming out of the stove entering nodularization bag; First nodulizing agent and second nodulizing agent be to its spheroidizing, and nucleating agent is to its inoculation for the first time;
(3) inoculation for the second time; When iron liquid height went out to hot metal ladle 2/3 in the hot metal ladle, in iron notch, evenly being sprinkled into quality be equivalent to come out of the stove 0.3%-0.5%, the granularity of iron liquid quality was the nucleating agent of 15-30 millimeter, and after iron liquid got into iron notch, nucleating agent was to its inoculation for the second time;
(4) inoculation for the third time; During iron liquid casting, add quality once more with iron liquid and be equivalent to the 0.1%-0.15% of iron liquid quality, nucleating agent that granularity is the 0.3-1 millimeter with to its inoculation for the third time; Promptly obtain the big section sphere of the present invention cast iron after the cast.
Among the above-mentioned preparation method, the moity of first nodulizing agent is: Y:2%-7%, Mg:7%-9%; Si:37%-44%, Ca:1%-3%, Sb:0.3%-0.4%; Mn:0.1%-0.4%; Al:0.1%-0.5%, Ti:0.1%-0.5%, surplus is Fe and inevitably micro-;
The moity of second nodulizing agent is: Re:2%-4%, and Mg:Mg:7%-9%, Si:37%-44%, Ca:1%-3%, Mn:0.1%-0.4%, Al:0.1%-0.5%, Ti:0.1%-0.5%, surplus is Fe and inevitably micro-;
The moity of nucleating agent is: Si:72%-76%, and Ca:0.1%-1.0%, Al:0.1%-0.5%, surplus is Fe and inevitably micro-.
Prepare the spheroidal graphite cast iron of embodiment one to embodiment three prescription and test its mechanical property and metallographic through above-mentioned preparation method, test result is as shown in table 1:
Table 1
Can know that through above-mentioned test result the present invention is big, and section nodular graphite cast iron has H.T., ferrite content and nodularization rate are all very high, are particularly suitable for the foundry goods of all kinds of HS, HI high impact merit machine tool, for example the injection moulding machine foundry goods.
Main chemical elements symbol and title that the present invention uses are explained as follows: C: carbon, Si: silicon, Mn: manganese, P: phosphorus, S: sulphur, Al: aluminium, Fe: iron, Cu: copper, Ca: calcium, O: oxygen, Ti: thallium, Sb: antimony, Mg: magnesium; Re: full name is Rare Earth, refers to REE, REE be in the periodic table of elements lanthanon and with the closely-related scandium of lanthanon (Sc) element and yttrium (Y) element.
Claims (9)
1. a big section nodular graphite cast iron is characterized in that, said big section nodular graphite cast iron mass percent is: C:3.5%-3.7%; Si:1.8%-1.9%, Mn:0.1%-0.2%, P:0.045%-0.05%; S:0.01%-0.015%, Re:0.018%-0.02%, Mg:0.05%-0.055%; Cu:0.5%, surplus is Fe and inevitably micro-.
2. big section nodular graphite cast iron according to claim 1 is characterized in that, said big section nodular graphite cast iron mass percent is: C:3.5%; Si:1.8%, Mn:0.1%, P:0.045%; S:0.01%, Re:0.018%, Mg:0.05%; Cu:0.5%, surplus is Fe and inevitably micro-.
3. big section nodular graphite cast iron according to claim 1 is characterized in that the mass percent of said big section nodular graphite cast iron is: C:3.6%; Si:1.85%, Mn:0.15%, P:0.048%; S:0.01%, Re:0.019%, Mg:0.052%; Cu:0.5%, surplus is Fe and inevitably micro-.
4. big section nodular graphite cast iron according to claim 1 is characterized in that the mass percent of said big section nodular graphite cast iron is: C:3.7%; Si:1.9%, Mn:0.2%, P:0.05%; S:0.015%, Re:0.02%, Mg:0.055%; Cu:0.5%, surplus is Fe and inevitably micro-.
5. according to each described big section nodular graphite cast iron of claim 1 to 4, it is characterized in that: the raw material of said big section nodular graphite cast iron is coke, Wingdale, the new pig iron, foundry return, steel scrap and iron alloy.
6. big section nodular graphite cast iron according to claim 5 is characterized in that: said coke composition is: S:0.1%-0.4%, and ash: 1%-10%, moisture content: 1%-5%, volatile matter: 0.1%-1.5%, surplus is a fixed carbon.
7. big section nodular graphite cast iron according to claim 5 is characterized in that: said Wingdale composition is: SiO2:0.1%-1.6%, and MgO:0.1%-2.5%, surplus is CaO.
8. big section nodular graphite cast iron according to claim 5; It is characterized in that: the composition of said foundry return is: C:3.60%-3.80%; Si:2.0%-2.5%, Mn:0.01%-0.2%, P:0.01%-0.05%; S:0.01%-0.03%, surplus is Fe and inevitably micro-.
9. big section nodular graphite cast iron according to claim 5 is characterized in that: said steel scrap composition is: C:0.1%-0.3%, and Mn:0.1%-0.3%, P:0.01%-0.03%, surplus is Fe and inevitably micro-.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103291058A CN102400032B (en) | 2011-10-20 | 2011-10-20 | Large-cross-section nodular cast iron |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103291058A CN102400032B (en) | 2011-10-20 | 2011-10-20 | Large-cross-section nodular cast iron |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102400032A true CN102400032A (en) | 2012-04-04 |
| CN102400032B CN102400032B (en) | 2013-12-04 |
Family
ID=45882671
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011103291058A Active CN102400032B (en) | 2011-10-20 | 2011-10-20 | Large-cross-section nodular cast iron |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102400032B (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103757172A (en) * | 2014-02-19 | 2014-04-30 | 恒天重工股份有限公司 | Method for preparing nodular cast iron |
| CN103789605A (en) * | 2014-02-19 | 2014-05-14 | 恒天重工股份有限公司 | Manufacturing method of spheroidal graphite cast iron casting of wind power yaw variable-pitch device |
| CN105316563A (en) * | 2015-10-29 | 2016-02-10 | 宁波康发铸造有限公司 | Inoculants, preparation method thereof and application in smelting of nodular cast iron |
| CN105950955A (en) * | 2016-05-31 | 2016-09-21 | 含山县兴达球墨铸铁厂 | Nodular cast iron for vehicle speed reducer and preparation process of nodular cast iron |
| CN108085580A (en) * | 2017-12-31 | 2018-05-29 | 山东汇金股份有限公司 | A kind of high intensity, high tenacity cast condition ductile iron and its production method |
| CN114085941A (en) * | 2021-12-02 | 2022-02-25 | 扬州广润机械有限公司 | Casting process of high-toughness nodular cast iron bushing for wind power |
| CN114737005A (en) * | 2022-04-15 | 2022-07-12 | 江苏亚峰合金材料有限公司 | Novel nodulizer for reducing chilling tendency of cast iron |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5876523A (en) * | 1996-04-29 | 1999-03-02 | Hitachi Metals, Ltd. | Method of producing spheroidal graphite cast iron article |
-
2011
- 2011-10-20 CN CN2011103291058A patent/CN102400032B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5876523A (en) * | 1996-04-29 | 1999-03-02 | Hitachi Metals, Ltd. | Method of producing spheroidal graphite cast iron article |
Non-Patent Citations (1)
| Title |
|---|
| 南京汽车制造厂: "球墨铸铁曲轴生产工艺", 《汽车技术》, no. 6, 31 December 1973 (1973-12-31), pages 38 - 50 * |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103757172A (en) * | 2014-02-19 | 2014-04-30 | 恒天重工股份有限公司 | Method for preparing nodular cast iron |
| CN103789605A (en) * | 2014-02-19 | 2014-05-14 | 恒天重工股份有限公司 | Manufacturing method of spheroidal graphite cast iron casting of wind power yaw variable-pitch device |
| CN105316563A (en) * | 2015-10-29 | 2016-02-10 | 宁波康发铸造有限公司 | Inoculants, preparation method thereof and application in smelting of nodular cast iron |
| CN105950955A (en) * | 2016-05-31 | 2016-09-21 | 含山县兴达球墨铸铁厂 | Nodular cast iron for vehicle speed reducer and preparation process of nodular cast iron |
| CN108085580A (en) * | 2017-12-31 | 2018-05-29 | 山东汇金股份有限公司 | A kind of high intensity, high tenacity cast condition ductile iron and its production method |
| CN114085941A (en) * | 2021-12-02 | 2022-02-25 | 扬州广润机械有限公司 | Casting process of high-toughness nodular cast iron bushing for wind power |
| CN114737005A (en) * | 2022-04-15 | 2022-07-12 | 江苏亚峰合金材料有限公司 | Novel nodulizer for reducing chilling tendency of cast iron |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102400032B (en) | 2013-12-04 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102400032B (en) | Large-cross-section nodular cast iron | |
| CN101942619B (en) | Glass mould material of alloy cast iron and preparation method thereof | |
| CN109371315B (en) | High-strength vermicular graphite cast iron and preparation method thereof | |
| CN106811676A (en) | A kind of high-intensity high-tenacity as cast condition QT700 10 and its production method | |
| CN102747268B (en) | High-strength high-ductility nodular cast iron and manufacturing method thereof | |
| CN102383027B (en) | Preparation method of nodular cast iron | |
| CN102071351B (en) | Vermicularizing treatment process of vanadium-titanium vermicular graphite cast iron | |
| CN103484753A (en) | Novel as-cast 500-7 nodular cast iron | |
| CN103498107A (en) | High-boron high-chromium low-carbon high-temperature-resistant wear-resisting alloy steel and manufacturing method thereof | |
| CN102851574B (en) | Heatproof alloy vermicular cast iron and method for preparing same | |
| CN102717035B (en) | Low Si-Mg ratio and low RE-Mg nodularizer | |
| CN105506442B (en) | A kind of Si Mn alloyings wear-resisting ductile iron abrading-ball and preparation method thereof | |
| CN103627971B (en) | Large gauge drilling tool structural alloy steel and smelting process thereof | |
| CN103498108A (en) | High-boron high-chromium low-carbon wear-resisting alloy steel with good red hardness and manufacturing method thereof | |
| CN102080177A (en) | Vanadium-titanium vermicular graphite cast iron | |
| CN103602879A (en) | Preparation method for high strength gray cast iron material | |
| CN105385935A (en) | High-silicon-molybdenum vermicular graphite cast iron and production method thereof | |
| CN105200305A (en) | Gray cast iron and preparation method thereof | |
| CN110964974A (en) | As-cast high-strength high-elongation synthetic nodular cast iron and preparation method thereof | |
| CN104726759A (en) | Production method of as-cast high-strength gray cast iron | |
| CN103805830A (en) | Preparation method for high strength gray cast iron material | |
| CN102373365B (en) | Large-section nodular cast iron | |
| CN103484794B (en) | Multi-component alloy cast iron preparation method | |
| CN106811677A (en) | A kind of piston ring carrier cast iron materials and its manufacture method | |
| CN111041336A (en) | Low-temperature impact-resistant high-strength as-cast nodular cast iron and production method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |