CN105441782A - Ductile iron casting and manufacturing method thereof - Google Patents
Ductile iron casting and manufacturing method thereof Download PDFInfo
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- CN105441782A CN105441782A CN201410508724.7A CN201410508724A CN105441782A CN 105441782 A CN105441782 A CN 105441782A CN 201410508724 A CN201410508724 A CN 201410508724A CN 105441782 A CN105441782 A CN 105441782A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
The invention provides a ductile iron casting, which comprises the following chemical components: 3.5-3.9% of C, 2.4-3.2% of Si, 0.4-0.5% of Mn, less than or equal to 0.1% of P, less than or equal to 0.03% of S, less than 0.04% of Ti, 0.030-0.045% of Mg residual, 0.005-0.015% of Re residual, and the balance Fe. The manufacturing method consists of: conducting inspection and compounding in front of a furnace, then carrying out smelting, nodularization, and then performing aftertreatment, like heat treatment, shot blasting, polishing and machining, etc., thus obtaining an output product. Twice inoculation achieves a good effect. The production process is simple, and has obviously decreased energy consumption, thus being suitable for mass production. While ensuring good comprehensive mechanical properties of ductile iron, the method saves adding of copper, tin and other precious metals. In addition, the ratio of raw materials is simple, and magnesium and rare earth are both controlled within the required range, so that the graphitization level of the ductile iron body molded by casting is stabilized at 1-2.
Description
Technical field
The invention belongs to casting technology field, especially relate to a kind of iron casting and manufacture method thereof.
Background technology
Spheroidal graphite cast iron is 20th century a kind of meehanite cast iron materials of growing up of the fifties, its metallographic structure is made up of graphite pebbles and matrix, GB/T9441-2009 " Spheroidal Graphite Cast Iron Metallographic Structure inspection " is divided into 6 grades graphite pebbles by the height of roundness, Oxygen potential is high, and plasticity and the toughness of magnesium iron are all right; Graphite pebbles is divided into six grades by size, reduces graphite sphere diameter, increases graphite pebbles and can improve the intensity of magnesium iron, plasticity and toughness significantly in the number of unit surface.The matrix of magnesium iron mainly contains ferrite, perlite, austenite, bainite, martensite, and cementite and iron phosphide eutectic etc., wherein, cementite and iron phosphide eutectic can reduce the tensile strength of magnesium iron, unit elongation and impelling strength strongly, therefore should avoid the appearance of cementite and iron phosphide eutectic.Compared with graphite graphitic cast iron in the form of sheets, the tensile strength of magnesium iron, unit elongation and impelling strength all increase substantially, such as: can up to 1400MPa through alloying and heat treated magnesium iron tensile strength; The magnesium iron unit elongation of ferrite matrix can reach more than 22%, and when-40 DEG C, the impact value of v-notch sample can reach more than 12J.
Magnesium iron has been successfully used to cast some stressed complexity, intensity, toughness, wear resistance require higher part, just based on the performance of its excellence, and relatively low cost, therefore, spheroidal graphite cast iron developed rapidly for be only second to graphitic cast iron, application cast iron materials very widely.
Spheroidal graphite cast iron obtains globular graphite by nodularization and inoculation, effectively improves the mechanical property of cast iron, in particular improve plasticity and toughness, thus obtain the intensity also higher than carbon steel.Foundry goods is all generally the perlite improved by heat treatment normalizing in matrix, reaches performance requriements.For saving thermal treatment cost, existing technique is when producing above foundry goods, and stokehold batching adds manganese, copper and tin.And although the noble metal such as copper, tin can make foundry goods as cast condition reach metallographic structure required by technical qualification and mechanical property thus cancel thermal treatment process.Although the interpolation of these noble metals, decreases thermal treatment process, production cost is still higher, and economic benefit is remarkable not.
Summary of the invention
The problem to be solved in the present invention is to provide a kind of iron casting and manufacture method thereof, this foundry goods chemical composition stability, and manufacturing process is simple, and production cost is low.
For solving the problems of the technologies described above, the technical solution used in the present invention is: a kind of iron casting, its chemical composition is: C3.5 ~ 3.9%, Si2.4 ~ 3.2%, Mn0.4 ~ 0.5%, P≤0.1%, S≤0.03%, Ti < 0.04%, Mg residual 0.030 ~ 0.045%, Re residual 0.005 ~ 0.015%, all the other are Fe.
Its preparation process comprises the steps:
1. the inspection of raw and process materials: the content detecting C, Si, Mn, S, P in starting material;
2. the proportioning of raw material: by the starting material be up to the standards, feed intake the Q12 pig iron 56% by weight percentage successively, steel scrap 8%, and foundry returns 36% carries out proportioning;
3. melt iron: the heating raw materials good by proportioning, makes it to become the molten iron of 1500 DEG C ~ 1550 DEG C and melting;
4. nodularization and breeding: nodulizing agent is added to melted molten iron and carries out nodularization, add simultaneously nucleating agent wrap in breed;
5. pour into a mould: pouring molten iron temperature controls at 1350 DEG C ~ 1450 DEG C in the moulding of Iron Mould Coated Sand, and will be poured in complete latter 6 minutes at liquid iron balling, carry out current-following inoculation again, then naturally cooling 8 ~ 10 hours simultaneously;
6. aftertreatment: unpacked by casting mold, takes out iron casting cleaning, is then carried out temper, soaking time 4 ~ 6 hours, naturally cooling after tempering, goes out part when cast(ing) surface temperature less than 600 DEG C, then carry out ball blast and polishing successively, after being up to the standards, carry out machining.
Further, described nodulizing agent is the RE-Mg-ferrosilicon alloy nodulizing agent of Mg5 ~ 6%, Re0.5 ~ 1.0%, and add that weight percentage content is melting total amount 0.8%.
Further, described nucleating agent FeSi75, and when breeding in wrapping nucleating agent add that weight percentage content is melting total amount 0.4%, during current-following inoculation nucleating agent add that weight percentage content is melting total amount 0.2%.
Further, described step 4. melt iron time, get test block and carry out carbon content detection, if carbon content is less than set quota, then add carburelant; If carbon content is greater than set quota, then add steel scrap again.
Further, described carburelant is graphite carburelant.
The advantage that the present invention has and positively effect are:
1) raw material ratio is reasonable, easy and simple to handle, and defines the content range of magnesium and rare earth in nodulizing agent, and be conducive to magnesium and rare earth to control in required scope, Oxygen potential can reach more than 92%.
2) production technique is simple, and energy consumption declines obviously, is applicable to produce in enormous quantities.
3) wrap in breed and breed for twice with current-following inoculation, pregnant effect is good, good product quality.
4) while guaranteeing that magnesium iron has good comprehensive mechanical property, saved the interpolation of the noble metal such as copper, tin, produced raw originally low.
Embodiment
Below specific embodiments of the invention are elaborated.
Embodiment 1
A kind of iron casting, its chemical composition is: C3.5%, Si2.5%, Mn0.4%, P≤0.1%, S≤0.03%, Ti < 0.04%, Mg residual 0.030 ~ 0.045%, Re residual 0.005 ~ 0.015%, all the other are Fe.
Embodiment 2
A kind of iron casting, its chemical composition is: C3.7%, Si2.9%, Mn0.45%, P≤0.1%, S≤0.03%, Ti < 0.04%, Mg residual 0.030 ~ 0.045%, Re residual 0.005 ~ 0.015%, all the other are Fe.
Embodiment 3
A kind of iron casting, its chemical composition is: C3.8%, Si3.2%, Mn0.5%, P≤0.1%, S≤0.03%, Ti < 0.04%, Mg residual 0.030 ~ 0.045%, Re residual 0.005 ~ 0.015%, all the other are Fe.
In above embodiment, the preparation process of iron casting comprises the steps:
1. the inspection of raw and process materials: the content detecting C, Si, Mn, S, P in starting material;
2. the proportioning of raw material: by the starting material be up to the standards, feed intake the Q12 pig iron 56% by weight percentage successively, steel scrap 8%, and foundry returns 36% carries out proportioning;
3. melt iron: the heating raw materials good by proportioning, makes it to become the molten iron of 1500 DEG C ~ 1550 DEG C and melting;
4. nodularization and breeding: nodulizing agent is added to melted molten iron and carries out nodularization, add simultaneously nucleating agent wrap in breed;
5. pour into a mould: pouring molten iron temperature controls at 1350 DEG C ~ 1450 DEG C in the moulding of Iron Mould Coated Sand, and will be poured in complete latter 6 minutes at liquid iron balling, carry out current-following inoculation again, then naturally cooling 8 ~ 10 hours simultaneously;
6. aftertreatment: unpacked by casting mold, takes out iron casting cleaning, is then carried out temper, soaking time 4 ~ 6 hours, naturally cooling after tempering, goes out part when cast(ing) surface temperature less than 600 DEG C, then carry out ball blast and polishing successively, after being up to the standards, carry out machining.
Wherein, described nodulizing agent is the RE-Mg-ferrosilicon alloy nodulizing agent of Mg5 ~ 6%, Re0.5 ~ 1.0%, and add that weight percentage content is melting total amount 0.8%.
It should be noted that, for ease of machining, in actually operating, while proof strength, silicone content 2.4% is advisable.
Wherein, described nucleating agent FeSi75, and when breeding in wrapping nucleating agent add that weight percentage content is melting total amount 0.4%, during current-following inoculation nucleating agent add that weight percentage content is melting total amount 0.2%.
It should be noted that, generally breed absorption 80% pregnant amount and account for iron water amount 0.2% ~ 0.4%.
Wherein, described step 4. melt iron time, get test block and carry out carbon content detection, if carbon content is less than set quota, then add carburelant; If carbon content is greater than set quota, then add steel scrap again.
Wherein, described carburelant is graphite carburelant.
Carburelant is steel-making, the conventional raw material of casting, the present invention uses that fixed carbon content is high, sulphur and the few graphite carburelant of ash oontent, as can the graphite carburelant produced of the remarkable graphite company limited of choice for use commercial type, the trade mark is 9012S, granularity is 0.6 ~ 4.75mm, and product specification is as following table:
Nodulizing agent can use dust to agree the low rare-earth nodularizer of low magnesium of the EImag5800 trade mark that carbon element (China) company limited produces, and composition sees the following form:
The magnesium iron specific performance index that the various embodiments described above obtain is as following table:
By actual measurement, in stove, silicon increases 2% ~ 8%, manganese scaling loss 5% ~ 15%.
Production technique of the present invention is simple, and energy consumption declines obviously, is applicable to produce in enormous quantities.Raw material ratio is reasonable, and defines the content range of magnesium and rare earth in nodulizing agent, is conducive to magnesium and rare earth to control in required scope, makes the greying rank of the magnesium iron body of casting be stabilized in 1-2 level (Oxygen potential more than 90%).Meanwhile, breed in wrapping and breed for twice with current-following inoculation, pregnant effect is good, good product quality.In addition, while guaranteeing that magnesium iron has good comprehensive mechanical property, save the interpolation of the noble metal such as copper, tin, produced raw originally low.
Above one embodiment of the present of invention have been described in detail, but described content being only preferred embodiment of the present invention, can not being considered to for limiting practical range of the present invention.All equalizations done according to the present patent application scope change and improve, and all should still belong within patent covering scope of the present invention.
Claims (6)
1. an iron casting, it is characterized in that: the chemical composition of described iron casting is: C3.5 ~ 3.9%, Si2.4 ~ 3.2%, Mn0.4 ~ 0.5%, P≤0.1%, S≤0.03%, Ti < 0.04%, Mg residual 0.030 ~ 0.045%, Re residual 0.005 ~ 0.015%, all the other are Fe.
2. a manufacture method for iron casting described in claim 1, is characterized in that: its preparation process comprises the steps:
1. the inspection of raw and process materials: the content detecting C, Si, Mn, S, P in starting material;
2. the proportioning of raw material: by the starting material be up to the standards, feed intake the Q12 pig iron 56% by weight percentage successively, steel scrap 8%, and foundry returns 36% carries out proportioning;
3. melt iron: the heating raw materials good by proportioning, makes it to become the molten iron of 1500 DEG C ~ 1550 DEG C and melting;
4. nodularization and breeding: nodulizing agent is added to melted molten iron and carries out nodularization, add simultaneously nucleating agent wrap in breed;
5. pour into a mould: pouring molten iron temperature controls at 1350 DEG C ~ 1450 DEG C in the moulding of Iron Mould Coated Sand, and will be poured in complete latter 6 minutes at liquid iron balling, carry out current-following inoculation again, then naturally cooling 8 ~ 10 hours simultaneously;
6. aftertreatment: unpacked by casting mold, takes out iron casting cleaning, is then carried out temper, soaking time 4 ~ 6 hours, naturally cooling after tempering, goes out part when cast(ing) surface temperature less than 600 DEG C, then carry out ball blast and polishing successively, after being up to the standards, carry out machining.
3. the manufacture method of iron casting according to claim 2, is characterized in that: described nodulizing agent is the RE-Mg-ferrosilicon alloy nodulizing agent of Mg5 ~ 6%, Re0.5 ~ 1.0%, and add that weight percentage content is melting total amount 0.8%.
4. the manufacture method of iron casting according to claim 2, it is characterized in that: described nucleating agent FeSi75, and when breeding in wrapping nucleating agent add that weight percentage content is melting total amount 0.4%, during current-following inoculation nucleating agent add that weight percentage content is melting total amount 0.2%.
5. the manufacture method of iron casting according to claim 2, is characterized in that: described step 4. melt iron time, get test block and carry out carbon content detection, if carbon content is less than set quota, then add carburelant; If carbon content is greater than set quota, then add steel scrap again.
6. the manufacture method of iron casting according to claim 5, is characterized in that: described carburelant is graphite carburelant.
Priority Applications (1)
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| CN201410508724.7A CN105441782A (en) | 2014-09-28 | 2014-09-28 | Ductile iron casting and manufacturing method thereof |
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| CN201410508724.7A CN105441782A (en) | 2014-09-28 | 2014-09-28 | Ductile iron casting and manufacturing method thereof |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105886888A (en) * | 2016-05-18 | 2016-08-24 | 芜湖市和蓄机械股份有限公司 | Method for casting train accessory through isothermal quenching |
| CN106077502A (en) * | 2016-06-01 | 2016-11-09 | 安徽振海重工机械有限公司 | One is applied to new-energy automobile and drives motor rotor rack casting technique |
| CN106825438A (en) * | 2017-03-13 | 2017-06-13 | 抚州市羊易铸业有限公司 | A kind of casting method of bevel housing |
| CN107904351A (en) * | 2017-12-14 | 2018-04-13 | 青岛华威五金工具有限公司 | Bench vice molten iron formula and its casting method |
| CN109109592A (en) * | 2018-11-13 | 2019-01-01 | 宁夏众信机械设备制造有限公司 | A kind of automobile torsion bar and its manufacture craft |
| CN109434036A (en) * | 2018-11-05 | 2019-03-08 | 浙江南钢铸业有限公司 | A kind of valve sand mo(u)ld casting process |
| CN110666153A (en) * | 2019-11-11 | 2020-01-10 | 常熟市振兴铸件有限公司 | Manufacturing process of glass bottle mold casting |
| CN112011720A (en) * | 2020-08-28 | 2020-12-01 | 浙江游星电子科技有限公司 | Nodular cast iron material and its production process and use |
| CN112359272A (en) * | 2020-11-03 | 2021-02-12 | 广东新兴铸管有限公司 | Formula and preparation method of high-purity molten iron |
| CN112518593A (en) * | 2020-12-03 | 2021-03-19 | 天津众达精密机械有限公司 | Shot blasting cleaning method for machining castings |
| CN112553521A (en) * | 2020-12-28 | 2021-03-26 | 江苏申达铸造有限公司 | Ductile iron bearing seat and preparation method thereof |
-
2014
- 2014-09-28 CN CN201410508724.7A patent/CN105441782A/en active Pending
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105886888A (en) * | 2016-05-18 | 2016-08-24 | 芜湖市和蓄机械股份有限公司 | Method for casting train accessory through isothermal quenching |
| CN106077502A (en) * | 2016-06-01 | 2016-11-09 | 安徽振海重工机械有限公司 | One is applied to new-energy automobile and drives motor rotor rack casting technique |
| CN106825438A (en) * | 2017-03-13 | 2017-06-13 | 抚州市羊易铸业有限公司 | A kind of casting method of bevel housing |
| CN106825438B (en) * | 2017-03-13 | 2018-10-16 | 抚州市羊易铸业有限公司 | A kind of casting method of bevel housing |
| CN107904351A (en) * | 2017-12-14 | 2018-04-13 | 青岛华威五金工具有限公司 | Bench vice molten iron formula and its casting method |
| CN109434036A (en) * | 2018-11-05 | 2019-03-08 | 浙江南钢铸业有限公司 | A kind of valve sand mo(u)ld casting process |
| CN109109592A (en) * | 2018-11-13 | 2019-01-01 | 宁夏众信机械设备制造有限公司 | A kind of automobile torsion bar and its manufacture craft |
| CN109109592B (en) * | 2018-11-13 | 2024-02-20 | 浙江锐泰悬挂系统科技有限公司 | Automobile torsion bar and manufacturing process thereof |
| CN110666153A (en) * | 2019-11-11 | 2020-01-10 | 常熟市振兴铸件有限公司 | Manufacturing process of glass bottle mold casting |
| CN112011720A (en) * | 2020-08-28 | 2020-12-01 | 浙江游星电子科技有限公司 | Nodular cast iron material and its production process and use |
| CN112359272A (en) * | 2020-11-03 | 2021-02-12 | 广东新兴铸管有限公司 | Formula and preparation method of high-purity molten iron |
| CN112518593A (en) * | 2020-12-03 | 2021-03-19 | 天津众达精密机械有限公司 | Shot blasting cleaning method for machining castings |
| CN112553521A (en) * | 2020-12-28 | 2021-03-26 | 江苏申达铸造有限公司 | Ductile iron bearing seat and preparation method thereof |
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