CN102121080A - Austenite spheroidal graphite cast iron diffuser and production method thereof - Google Patents
Austenite spheroidal graphite cast iron diffuser and production method thereof Download PDFInfo
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- CN102121080A CN102121080A CN 201110008983 CN201110008983A CN102121080A CN 102121080 A CN102121080 A CN 102121080A CN 201110008983 CN201110008983 CN 201110008983 CN 201110008983 A CN201110008983 A CN 201110008983A CN 102121080 A CN102121080 A CN 102121080A
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Abstract
The invention discloses an austenite spheroidal graphite cast iron diffuser and a production method thereof, and relates to a production process of metal castings. The process comprises the following steps: manufacturing an upper box and a lower box through plane parting; casting a raw material smelted by an intermediate frequency alkaline induction furnace to a cavity by virtue of a leakage bag; removing a casting head; taking out the casting; and carrying out heat treatment on the casting. The raw material comprises the following components in percentage by weight: more than or equal to 3.00% of C, 1.5-3.0% of Si, 0,5-1.5% of Mn, 1.0-2.5% of Cr, 18.0-22.0% of Ni and the balance of Fe. The austenite spheroidal graphite cast iron diffuser provided by the invention is accurate in size, and has no defects of shrinkage porosity, shrinkage cavity and the like in the diffuser; the ultrasonic flaw detection at a stressed part is more than 2 level, the casting finished product is promoted to over 98% from 92%, the bending deflection of the casting is lowered to 1-2mm from 5-6mm, and the service life is over 1.8 times of that of the original material.
Description
Technical field
The present invention relates to the production technical field of the production technique of metal founding, particularly scatterer.
Background technology
Scatterer is the key part of steel mill's bell furnace, and working temperature is 900 ℃ ± 50 ℃, and the oxidation reducing atmosphere is arranged in the stove.High temperature resistant, corrosion that scatterer requires, and have good high temperature strength.4 one group of scatterer, every gross weight 320kg.Existing scatterer material is ZG4Cr25Ni20Si2, though its high-temperature behavior of this austenitic heat-resistance steel is good, but corrosion resistance is poor, the product usage period is short, castability is poor, foundry goods easily produces number of drawbacks and scraps, and the force part UT (Ultrasonic Testing) generally below 3 grades, is difficult to reach the product design requirement.
Summary of the invention
The object of the invention is to design the austenite ductile cast iron scatterer that a kind of corrosion resistance is good, high-temperature behavior is good.
Comprise Fe, C, Si, Mn, Cr and Ni in the composition of the present invention, it is characterized in that the degree that described each composition accounts for total mass is respectively: C≤3.00%; Si=1.5～3.0%; Mn=0.5～1.5%; Cr=1.0～2.5%; Ni=18.0～22.0%; Surplus is Fe.
Because the present invention done bold improvement on component, particularly since in the original product Cr content cause molten steel easily to form Cr up to more than 20%
2O
3Compound Deng complicated makes the molten steel retrogradation, and flowing property reduces, and foundry goods is easy to produce casting flaws such as elephant skin, cold shut, slag inclusion.Because Cr content height shrinks greatly, heat conductivility is poor, and thermal stresses is big, and foundry goods easily cracks.Teeming temperature height, foundry goods easily produce scab, defectives such as distortion.Wall thickness such as foundry goods are concentrated the feeding difficulty with rising head.The foundry goods recovery rate is low.Foundry goods easily produces defectives such as shrinkage porosite, shrinkage cavity, and the force part flaw detection does not meet the drawing requirement.
In addition, the present invention is because carbon content is higher than nearly 10 times of original material, thereby its good flowing properties, and iron liquid cavity filling ability is strong.The secondary graphitizing of globular graphite expands in conjunction with rational running and feeding system, and foundry goods can obtain fine and close tissue.Teeming temperature is low, and shrinkage is little, and cast(ing) surface is bright and clean, and casting flaws such as cold shut, scab, distortion, misrun are few.Thereby casting qualified rate reaches more than 98%.The flaw detection of scatterer force part reaches more than 2 grades, meets customer requirements fully.
In a word, the present invention has improved the organization mechanics performance, and lubricity is good, and thermal expansion is big, and is nonmagnetic.Have good high temperature strength, deflection is little, and hot cracking tendency is little, and excellent corrosion, particularly castability are better than original material.The scatterer size of producing is accurate, defectives such as inner no shrinkage porosite, shrinkage cavity, force part UT (Ultrasonic Testing) be more than 2 grades, and casting finished products rises to more than 98% from original 92%, the foundry goods bending deformation quantity is reduced to 1～2mm by 5 original～6mm, and be more than 1.8 times of original material work-ing life.
Another purpose of the present invention provides the production method of above austenite ductile cast iron scatterer.
Production stage is: employing plane somatotype, upward nowel making, in die cavity, pour into a mould the raw material of smelting by intermediate frequency alkalescence induction furnace with bottom pour ladle, and behind the removal dead head, the taking-up foundry goods is heat-treated foundry goods again.
For inclusion can be floated, pushing off the slag better, guarantee the hot metal purifying degree, the present invention adopts the bottom filling enlarged running system, as long as the cross-sectional area of described enlarged running system sprue, cross gate and ingate is than explaining area ratio for the gating system in the 1:2:0.65(casting with regard to energy basic explanation situation).Teeming temperature is reduced to 1400 ℃ from 1540 ℃ of former converted products.
Described pouring speed is 18kg/s.
In order to improve the riser feeding effect better, the present invention also is provided with insulated feeder in the die cavity upper surface.Adopt technology of the present invention, the shrinkage of foundry goods can reduce to 1.8% from 2.5%.
Described die cavity is that sodium silicate sand is made, and before the cast raw material, mold cavity surface adopts quartzy coating brushing 2 times.Advantage is: sand mold intensity is good, and is easy to operate, mould casting surface smoothness height.
For the ease of shrinking in the loam core, does sky in the middle of the loam core, fix with dry sand after joining case, be beneficial to the defeated and dispersed of loam core and give vent to anger.
When intermediate frequency alkalescence induction furnace raw materials for metallurgy, electrolytic nickel, ferrochrome is roasting red in 600 ℃ with stove fire, together put into the crucible of intermediate frequency alkalescence induction furnace, smelt to molten iron tapping temperature 〉=1480 ℃ with non-oxidizing process, then with twice of molten steel preparation; Nucleating agent is by 1.2% adding that accounts for the molten iron total mass for the first time, and nucleating agent is by 0.6% adding that accounts for the molten iron total mass for the second time; Nodulizing agent adopts magnesium-rare earth, and nodulizing agent is by 1.8% adding that accounts for the molten iron total mass.The nodulizing agent ratio routine that adds is many 0.2%, mainly considers tapping temperature than general magnesium iron height, like this nodularization fierceness more.
The thermal treatment of Cai Yonging in the past is 1050 ℃ of solution treatment, and the present invention adopts 900 ℃ of thermal treatments of austenitizing normalizing.The conserve energy loss reduces production costs in a large number.
Embodiment
One, mould is prepared
Adopt the plane somatotype, last nowel is made, and flat doing equalled the processing method of watering.For pushing off the slag better, designed the bottom filling enlarged running system, enlarged running system is made up of sprue, cross gate and ingate, ingate is arranged on cavity bottom, one end connects die cavity, one end connects cross gate, and sprue is arranged on cross gate central authorities, and the upper end of sprue is provided with pouring basin.Use template, 2 of design insulated feeders are placed on the pipe top.Put 2 groups of internal chills, 2 of external chills at foundry goods thermal center place.
Dull and stereotyped 2 of wood pattern molding, steady brace location, special shape mo(u)lding box moulding.Moulding sodium silicate sand mainly is that sand mold intensity is good, easy to operate.CO
2After the sclerosis, baked tensile strength 〉=2.5kg/mm
2, after the reusable heat blower fan dries up, baked tensile strength 〉=4.5kg/mm
2Before the cast, mold cavity surface is with quartzy paint brush 2 times.
For the ease of shrinking in the loam core, does sky in the middle of the loam core, fix with dry sand after joining case, be beneficial to the defeated and dispersed of loam core and give vent to anger.Before the cast, the loam core is placed in the die cavity.
Two, smelt
Target chemical ingredients C≤3.00%; Si=1.5～3.0%; Mn=0.5～1.5%; Cr=1.0～2.5%; Ni=18.0～22.0%; Surplus is Fe.
Earlier steel scrap is cut into small pieces, clean with rumbling.Electrolytic nickel, ferrochrome is roasting red in 600 ℃ with stove fire, together put into the crucible of alkaline intermediate frequency furnace, smelt by non-oxidizing process smelting operation technology.Molten iron tapping temperature 〉=1480 ℃.Molten steel preparation 2 times.The nodulizing agent magnesium-rare earth pours the method operation with cover plate.Nodulizing agent is by 1.8% adding that accounts for the molten iron total mass.
Nucleating agent is by 1.2% adding that accounts for the molten iron total mass for the first time, and nucleating agent is by 0.6% adding that accounts for the molten iron total mass for the second time.
Three, cast
The cast of employing bottom pour ladle, pouring speed is controlled at 18kg/s.After cooling, take out foundry goods.
Four, thermal treatment
Foundry goods is carried out high temperature complete austenitizing normalizing with electric furnace heat-treats for 900 ℃.
Five, the synopsis of product of the present invention and ZG4Cr25Ni20Si2 product
Table one chemical ingredients synopsis
| ? | C | Si | Mn | Cr | Ni | Mo | P | S |
| ZG4Cr25Ni20Si2 | 0.35～0.45 | ≤2.00 | ≤2.00 | 23.0～27.0 | 18.0～22.0 | ≤0.50 | ≤0.04 | ≤0.04 |
| The present invention | ≤3.00 | 1.5～3.0 | 0.5～1.5 | 1.0～2.5 | 18.0～22.0 | ? | ? | ? |
Mechanical property synopsis under table two normal temperature
| ? | Rm(MPa) | Rp0.2(Mpa) | A5% | E(kPa) | HBS |
| ZG4Cr25Ni20Si2 | 440 | 240 | 8 | 180 | 160 |
| The present invention | 460 | 230 | 12 | 130 | 200 |
Claims (8)
1. the austenite ductile cast iron scatterer comprises Fe, C, Si, Mn, Cr and Ni in the composition, it is characterized in that the degree that described each composition accounts for total mass is respectively: C≤3.00%; Si=1.5～3.0%; Mn=0.5～1.5%; Cr=1.0～2.5%; Ni=18.0～22.0%; Surplus is Fe.
2. the production method of austenite ductile cast iron scatterer according to claim 1, it is characterized in that adopting the plane somatotype, go up the nowel making, in die cavity, pour into a mould the raw material of smelting by intermediate frequency alkalescence induction furnace with bottom pour ladle, after removing dead head, take out foundry goods, again foundry goods is heat-treated; The degree that each composition accounts for total mass in the described raw material is respectively: C≤3.00%; Si=1.5～3.0%; Mn=0.5～1.5%; Cr=1.0～2.5%; Ni=18.0～22.0%; Surplus is Fe.
3. according to the production method of the described austenite ductile cast iron scatterer of claim 2, it is characterized in that on die cavity, connecting the bottom filling enlarged running system, described enlarged running system is made up of sprue, cross gate and ingate, ingate is arranged on cavity bottom, one end connects die cavity, one end connects cross gate, and sprue is arranged on cross gate central authorities, and the upper end of sprue is provided with pouring basin.
4. according to the production method of the described austenite ductile cast iron scatterer of claim 2, it is characterized in that pouring speed is 18kg/s.
5. according to the production method of the described austenite ductile cast iron scatterer of claim 2, it is characterized in that insulated feeder being set in the die cavity upper surface.
6. according to the production method of the described austenite ductile cast iron scatterer of claim 2, it is characterized in that described die cavity is that sodium silicate sand is made, before the cast raw material, mold cavity surface adopts quartzy coating brushing 2 times.
7. according to the production method of the described austenite ductile cast iron scatterer of claim 2, it is characterized in that described loam core is hollow loam core, fix with dry sand after joining case.
8. according to the production method of the described austenite ductile cast iron scatterer of claim 2, it is characterized in that when intermediate frequency alkalescence induction furnace raw materials for metallurgy, bake red to 600 ℃ with stove fire electrolytic nickel, ferrochrome, together put into the crucible of intermediate frequency alkalescence induction furnace, smelt to molten iron tapping temperature 〉=1480 ℃ with non-oxidizing process, then with twice of molten steel preparation; Nucleating agent is by 1.2% adding that accounts for the molten iron total mass for the first time, and nucleating agent is by 0.6% adding that accounts for the molten iron total mass for the second time; Nodulizing agent adopts magnesium-rare earth, and nodulizing agent is by 1.8% adding that accounts for the molten iron total mass.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110008983 CN102121080A (en) | 2010-08-20 | 2011-01-17 | Austenite spheroidal graphite cast iron diffuser and production method thereof |
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102602445A CN101920311A (en) | 2010-08-20 | 2010-08-20 | Method for producing metal casting |
| CN201010260244.5 | 2010-08-20 | ||
| CN2010105353001A CN101962732A (en) | 2010-11-09 | 2010-11-09 | Austenite nodular cast iron diffuser and production method thereof |
| CN201010535300.1 | 2010-11-09 | ||
| CN 201110008983 CN102121080A (en) | 2010-08-20 | 2011-01-17 | Austenite spheroidal graphite cast iron diffuser and production method thereof |
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| CN102121080A true CN102121080A (en) | 2011-07-13 |
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| CN 201110008983 Pending CN102121080A (en) | 2010-08-20 | 2011-01-17 | Austenite spheroidal graphite cast iron diffuser and production method thereof |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102615248A (en) * | 2012-04-26 | 2012-08-01 | 苏州科羽电子技术服务有限公司 | Production process for casting |
| CN102634721A (en) * | 2012-05-10 | 2012-08-15 | 常熟市千斤顶铸造有限公司 | Production process of high-elongation nodular cast iron being as cast condition |
| CN103014482A (en) * | 2012-12-28 | 2013-04-03 | 山东省源通机械股份有限公司 | Metal material produced from heat-resistant and corrosion-resistant austenite nodular cast iron and manufacturing method thereof |
| CN105401062A (en) * | 2015-11-17 | 2016-03-16 | 益阳紫荆福利铸业有限公司 | High-nickel austenite corrosion-resistant nodular cast iron |
-
2011
- 2011-01-17 CN CN 201110008983 patent/CN102121080A/en active Pending
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| 《现代铸铁》 20040430 戴塘顺 镍奥氏体铸铁的生产 第36-38页 1-8 , 第2期 2 * |
| 《铸造实用技术问答》 20071231 杜西灵等 《铸造实用技术问答》 机械工业出版社 第348页 4 , 1 * |
| 《铸造工艺设计及铸件缺陷控制》 20090430 李晨希 《铸造工艺设计及铸件缺陷控制》 化学工业出版社 第112页 3 , 1 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102615248A (en) * | 2012-04-26 | 2012-08-01 | 苏州科羽电子技术服务有限公司 | Production process for casting |
| CN102634721A (en) * | 2012-05-10 | 2012-08-15 | 常熟市千斤顶铸造有限公司 | Production process of high-elongation nodular cast iron being as cast condition |
| CN103014482A (en) * | 2012-12-28 | 2013-04-03 | 山东省源通机械股份有限公司 | Metal material produced from heat-resistant and corrosion-resistant austenite nodular cast iron and manufacturing method thereof |
| CN105401062A (en) * | 2015-11-17 | 2016-03-16 | 益阳紫荆福利铸业有限公司 | High-nickel austenite corrosion-resistant nodular cast iron |
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Application publication date: 20110713 |