CN107385282A - A kind of heat-resisting alloy steel thin-wall pipe sand casting process - Google Patents
A kind of heat-resisting alloy steel thin-wall pipe sand casting process Download PDFInfo
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- CN107385282A CN107385282A CN201710613314.2A CN201710613314A CN107385282A CN 107385282 A CN107385282 A CN 107385282A CN 201710613314 A CN201710613314 A CN 201710613314A CN 107385282 A CN107385282 A CN 107385282A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C19/00—Alloys based on nickel or cobalt
- C22C19/03—Alloys based on nickel or cobalt based on nickel
- C22C19/05—Alloys based on nickel or cobalt based on nickel with chromium
- C22C19/051—Alloys based on nickel or cobalt based on nickel with chromium and Mo or W
- C22C19/055—Alloys based on nickel or cobalt based on nickel with chromium and Mo or W with the maximum Cr content being at least 20% but less than 30%
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/02—Sand moulds or like moulds for shaped castings
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/08—Features with respect to supply of molten metal, e.g. ingates, circular gates, skim gates
- B22C9/082—Sprues, pouring cups
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/22—Moulds for peculiarly-shaped castings
- B22C9/24—Moulds for peculiarly-shaped castings for hollow articles
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C30/00—Alloys containing less than 50% by weight of each constituent
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
The invention discloses a kind of heat-resisting alloy steel thin-wall pipe sand casting process, described heat-resisting alloy steel thin-wall pipe includes following raw material and weight fraction：C accountings 0.35% 0.55%, Si accountings 1% 2%, Mn≤1.5%, P≤0.04%, S≤0.03%, Cr accountings 27% 30%, Ni accountings 47% 50%, Mo≤0.5%, W accountings 4% 5.5%, surplus Fe.The present invention is changed to sand casting by model casting, substantially increases casting yield and production efficiency by the improvement to thin-walled M type elbow casting traditional handicrafts, casting dimension meets drawing requirement, product yield brings up to 56%, and casting qualified rate brings up to 98%, achieves good economic benefit.
Description
Technical field
The present invention relates to casting technology field, especially a kind of heat-resisting alloy steel thin-wall pipe sand casting process.
Background technology
M type elbows are one of pipe fittings that heating radiation pipe is conventional in metallurgy industry continuous annealing furnace, although shape is uncomplicated,
But wall thickness is thin, volume is big, and material property and size precision prescribed are high, and production is of large quantities, and this pipe fitting mainly passes through model casting
Form, model casting is also known as lost-wax casting.
Although model casting surface quality of continuous castings is better than sand casting, the production cost of model casting is higher, work
Skill yield rate is low, production cycle length.It is more that model casting produces this thin-wall bend pipe fitting casting flaw：At the top of elbow at thermal center
Generation shrinkage cavity and porosity is serious, and the centre-to-centre spacing of each mouth of pipe can not guarantee that deviation is larger, maximum deviation 6mm, crossing ellipsization, ovality
It is up to 8mm, does not meet circular requirement.
The problem of for the above, herein it is proposed that a kind of heat-resisting alloy steel thin-wall pipe sand casting process.
The content of the invention
The present invention is directed to the deficiency in background technology, there is provided a kind of heat-resisting alloy steel thin-wall pipe sand casting process.
The present invention is solves above-mentioned technical deficiency, in order to improve production efficiency and yield rate, using sand casting, new technology
The yield rate of casting is significantly improved, reduces production cost, achieves good economic benefit, a kind of heat-resisting alloy steel thin-walled
Pipe fitting sand casting process, described heat-resisting alloy steel thin-wall pipe include following raw material and weight fraction：C accountings 0.35%-
0.55%, Si accounting 1%-2%, Mn≤1.5%, P≤0.04%, S≤0.03%, Cr accounting 27%-30%, Ni accounting
47%-50%, Mo≤0.5%, W accounting 4%-5.5%, surplus Fe.
As a kind of preferred embodiment of the present invention, it is comprised the following steps that：
A, mould prepares：The mould of casting can use it is wood mold coupled, cast aluminium alloy gold metal die can also be used.
B, moulding (core) mode：Casting is heat resisting steel, preferably with phenolic sand molding (core), before sand core strength is ensured
Put, straw rope or wood chip placed on core center line, can also be fabricated to along core center line it is hollow, to ensure that core has
Enough gas permeabilities and deformability.
C, cast paint：Coating uses alcohol zircon flour coating, and coating is using preceding stirring, in order to obtain foot
Enough strength of coatings, to be lighted a fire as early as possible after brushing, brushing number be not less than 3 times, could be applied after the igniting of every coating cools
Brush next time.
D, smelting molten steel：With electric arc furnaces smelting molten steel, reduction period is needed to strengthen deoxidation operation, and high alkalinity white slag is made in stove,
It is added in ladle, and can not be added in stove in the metallic element tapping process such as Zr, Ti, B, rare earth, reduces active element oxidation
Scaling loss, recovery rate is improved, and reduce inclusion content, improve Molten Steel Cleanliness.
E, pouring technology：Using the method for filling type simultaneously from multiple mouths of pipe, ingate, which will design, circularizes whole circle, and is
Slot-shaped narrow ingate, the size of the specific size of narrow ingate " t " will be calculated according to the wall thickness " d " of casting, i.e. t
=kd, k are safety coefficient, can so ensure that molten steel is quick, uniformly be full of die cavity, while can also play the work of pushing off the slag
With.Cross gate is also designed to the whole circle of annular in multiple mouths of pipe, pricks upper air-vent during moulding at the top of it, such cross gate not only rises
To the effect of blind riser, and also act as the effect of pushing off the slag and exhaust.Cooled and solidified guiding groove is designed on ingate, the groove
The direction of casting cooled and solidified is guided, guiding groove size " s " size is to determine that i.e. s=nD, n are according to casting nozzle diameter " D "
Coefficient, rising head is set in casting section thickness thicker part and peak, can be more preferable using insulated feeder effect.
F, pouring practice：1600 ± 10 DEG C of liquid steel temperature of control, using rising pouring ladle, is noted by depositing funnel before cast
Enter, duration of pouring 28s, pouring temperature and poring rate need strictly to perform by technological parameter.
G, clear up：Carried out after casting pouring removing surface remove the glutinous sand inside and outside casting, the fash at die joint and core print,
Burr, rising head excision vestige, then carry out shotblasting processing.
It is interior using the method for filling type simultaneously from multiple mouths of pipe in step e as a kind of preferred embodiment of the present invention
Running channel, which will design, circularizes whole circle, and is slot-shaped narrow ingate, and the size of the specific size of narrow ingate " t " wants root
Calculated according to the wall thickness " d " of casting, i.e. t=kd, k are safety coefficient, can so ensure that molten steel is quick, uniformly be full of type
Chamber, while pushing off the slag can also be played a part of.Cross gate is also designed to the whole circle of annular in multiple mouths of pipe, is pricked at the top of it during moulding
Upper air-vent, such cross gate not only act as the effect of blind riser, and also act as the effect of pushing off the slag and exhaust.On ingate
Cooled and solidified guiding groove is designed, the groove guides the direction of casting cooled and solidified, and guiding groove size " s " size is according to casting pipe
Mouth diameter " D " determines that i.e. s=nD, n are coefficient, sets rising head in casting section thickness thicker part and peak, is imitated using insulated feeder
Fruit can be more preferable.
As a kind of preferred embodiment of the present invention, in step b, casting is heat resisting steel, preferably with phenolic sand molding
(core), on the premise of sand core strength is ensured, straw rope or wood chip are placed on core center line, can also be along core center line
Be fabricated to it is hollow, to ensure that core has enough gas permeability and deformability.
The beneficial effect that is reached of the present invention is：By the improvement to thin-walled M type elbow casting traditional handicrafts, cast by fusible pattern
Make and be changed to sand casting, substantially increase casting yield and production efficiency, casting dimension meets drawing requirement, product yield
56% is brought up to, casting qualified rate brings up to 98%, achieves good economic benefit, in metallurgy industry continuous annealing furnace,
There are many thin-walled heat resisting steel alloy pipe fittings, can be improved according to the technique, petrochemical industry pyrolysis furnace can also be applied to
In, pipe fitting is more in pyrolysis furnace, such as Y-piece, palm shape pipe, 90 ° of elbows, 180 ° of elbow heat resisting steel alloy-steel castings, according to the work
After skill is improved, effect can be more obvious.
Embodiment
A kind of heat-resisting alloy steel thin-wall pipe sand casting process, described heat-resisting alloy steel thin-wall pipe include following original
Material and weight fraction：C accountings 0.35%-0.55%, Si accounting 1%-2%, Mn≤1.5%, P≤0.04%, S≤0.03%,
Cr accountings 27%-30%, Ni accounting 47%-50%, Mo≤0.5%, W accounting 4%-5.5%, Fe surplus is Fe.
It is comprised the following steps that：
A, mould prepares：The mould of casting can use it is wood mold coupled, cast aluminium alloy gold metal die can also be used.
B, moulding (core) mode：Casting is heat resisting steel, preferably with phenolic sand molding (core), before sand core strength is ensured
Put, straw rope or wood chip placed on core center line, can also be fabricated to along core center line it is hollow, to ensure that core has
Enough gas permeabilities and deformability.
C, cast paint：Coating uses alcohol zircon flour coating, and coating is using preceding stirring, in order to obtain foot
Enough strength of coatings, to be lighted a fire as early as possible after brushing, brushing number be not less than 3 times, could be applied after the igniting of every coating cools
Brush next time.
D, smelting molten steel：With electric arc furnaces smelting molten steel, reduction period is needed to strengthen deoxidation operation, and high alkalinity white slag is made in stove,
It is added in ladle, and can not be added in stove in the metallic element tapping process such as Zr, Ti, B, rare earth, reduces active element oxidation
Scaling loss, recovery rate is improved, and reduce inclusion content, improve Molten Steel Cleanliness.
E, pouring technology：Using the method for filling type simultaneously from multiple mouths of pipe, ingate, which will design, circularizes whole circle, and is
Slot-shaped narrow ingate, the size of the specific size of narrow ingate " t " will be calculated according to the wall thickness " d " of casting, i.e. t
=kd, k are safety coefficient, can so ensure that molten steel is quick, uniformly be full of die cavity, while can also play the work of pushing off the slag
With.Cross gate is also designed to the whole circle of annular in multiple mouths of pipe, pricks upper air-vent during moulding at the top of it, such cross gate not only rises
To the effect of blind riser, and also act as the effect of pushing off the slag and exhaust.Cooled and solidified guiding groove is designed on ingate, the groove
The direction of casting cooled and solidified is guided, guiding groove size " s " size is to determine that i.e. s=nD, n are according to casting nozzle diameter " D "
Coefficient, rising head is set in casting section thickness thicker part and peak, can be more preferable using insulated feeder effect.
F, pouring practice：1600 ± 10 DEG C of liquid steel temperature of control, using rising pouring ladle, is noted by depositing funnel before cast
Enter, duration of pouring 28s, pouring temperature and poring rate need strictly to perform by technological parameter.
G, clear up：Carried out after casting pouring removing surface remove the glutinous sand inside and outside casting, the fash at die joint and core print,
Burr, rising head excision vestige, then carry out shotblasting processing.
In step e, using the method for filling type simultaneously from multiple mouths of pipe, ingate, which will design, circularizes whole circle, and is seam
The narrow ingate of gap shape, the size of the specific size of narrow ingate " t " will be calculated according to the wall thickness " d " of casting, i.e. t=
Kd, k are safety coefficient, can so ensure that molten steel is quick, uniformly be full of die cavity, while can also play a part of pushing off the slag.
Cross gate is also designed to the whole circle of annular in multiple mouths of pipe, pricks upper air-vent during moulding at the top of it, such cross gate not only acts as
The effect of blind riser, and also act as the effect of pushing off the slag and exhaust.Cooled and solidified guiding groove is designed on ingate, the groove draws
The direction of casting cooled and solidified is led, guiding groove size " s " size is determined according to casting nozzle diameter " D ", i.e. s=nD, n are to be
Number, rising head is set in casting section thickness thicker part and peak, can be more preferable using insulated feeder effect.
In step b, casting is heat resisting steel, preferably with phenolic sand molding (core), on the premise of sand core strength is ensured,
Straw rope or wood chip are placed on core center line, can also be fabricated to along core center line it is hollow, to ensure that it is enough that core has
Gas permeability and deformability.
Example form is as follows：
Product qualification rate statistical form
Operation principle：The invention for needing to illustrate is cast by the improvement to thin-walled M type elbow casting traditional handicrafts by fusible pattern
Make and be changed to sand casting, substantially increase casting yield and production efficiency, casting dimension meets drawing requirement, product yield
56% is brought up to, casting qualified rate brings up to 98%, achieves good economic benefit, in metallurgy industry continuous annealing furnace,
There are many thin-walled heat resisting steel alloy pipe fittings, can be improved according to the technique, petrochemical industry pyrolysis furnace can also be applied to
In, pipe fitting is more in pyrolysis furnace, such as Y-piece, palm shape pipe, 90 ° of elbows, 180 ° of elbow heat resisting steel alloy-steel castings, according to the work
After skill is improved, effect can be more obvious.
Finally it should be noted that：The preferred embodiments of the present invention are the foregoing is only, are not intended to limit the invention,
Although the present invention is described in detail with reference to the foregoing embodiments, for those skilled in the art, it still may be used
To be modified to the technical scheme described in foregoing embodiments, or equivalent substitution is carried out to which part technical characteristic.
Within the spirit and principles of the invention, any modification, equivalent substitution and improvements made etc., it should be included in the present invention's
Within protection domain.
Claims (4)
- A kind of 1. heat-resisting alloy steel thin-wall pipe sand casting process, it is characterised in that described heat-resisting alloy steel thin-wall pipe Including following raw material and weight fraction：C accountings 0.35%-0.55%, Si accounting 1%-2%, Mn≤1.5%, P≤0.04%, S ≤ 0.03%, Cr accounting 27%-30%, Ni accounting 47%-50%, Mo≤0.5%, W accounting 4%-5.5%, surplus Fe.
- 2. a kind of technique for casting heat-resisting alloy steel thin-wall pipe sand mold according to claim 1, it is characterised in that it has Body step is as follows：A, mould prepares：The mould of casting can use it is wood mold coupled, cast aluminium alloy gold metal die can also be used.B, moulding (core) mode：Casting is heat resisting steel, preferably with phenolic sand molding (core), is ensureing the premise of sand core strength Under, straw rope or wood chip are placed on core center line, can also be fabricated to along core center line it is hollow, to ensure that core has foot Enough gas permeabilities and deformability.C, cast paint：Coating uses alcohol zircon flour coating, and coating is enough in order to obtain using preceding stirring Strength of coating, to be lighted a fire as early as possible after brushing, brushing number be not less than 3 times, in the case where that could be brushed after the igniting of every coating cools One time.D, smelting molten steel：With electric arc furnaces smelting molten steel, reduction period needs to strengthen deoxidation operation, makes high alkalinity white slag in stove, Zr, It is added in ladle, and can not be added in stove in the metallic element tapping process such as Ti, B, rare earth, is burnt with reducing active element oxidation Damage, recovery rate is improved, and reduce inclusion content, improve Molten Steel Cleanliness.E, pouring technology：Using the method for filling type simultaneously from multiple mouths of pipe, ingate, which will design, circularizes whole circle, and is gap The narrow ingate of shape, the size of the specific size of narrow ingate " t " will be calculated according to the wall thickness " d " of casting, i.e. t= Kd, k are safety coefficient, can so ensure that molten steel is quick, uniformly be full of die cavity, while can also play a part of pushing off the slag. Cross gate is also designed to the whole circle of annular in multiple mouths of pipe, pricks upper air-vent during moulding at the top of it, such cross gate not only acts as The effect of blind riser, and also act as the effect of pushing off the slag and exhaust.Cooled and solidified guiding groove is designed on ingate, the groove draws The direction of casting cooled and solidified is led, guiding groove size " s " size is determined according to casting nozzle diameter " D ", i.e. s=nD, n are to be Number, rising head is set in casting section thickness thicker part and peak, can be more preferable using insulated feeder effect.F, pouring practice：1600 ± 10 DEG C of liquid steel temperature of control, using rising pouring ladle, is injected by depositing funnel, poured before cast Time 28s is noted, pouring temperature and poring rate need strictly to perform by technological parameter.G, clear up：The fash at glutinous sand, die joint and core print, hair after casting pouring inside and outside progress removing surface removal casting Thorn, rising head excision vestige, then carry out shotblasting processing.
- A kind of 3. heat-resisting alloy steel thin-wall pipe sand casting process according to claim 1, it is characterised in that：Step e In, fill the method for type simultaneously using from multiple mouths of pipe, ingate, which will design, circularizes whole circle, and for it is slot-shaped it is narrow in pour Road, the size of the specific size of narrow ingate " t " will be calculated according to the wall thickness " d " of casting, i.e. t=kd, k are for safety Number, it can so ensure that molten steel is quick, uniformly be full of die cavity, while pushing off the slag can also be played a part of.Cross gate is multiple The mouth of pipe is also designed to the whole circle of annular, pricks upper air-vent during moulding at the top of it, and such cross gate not only acts as the effect of blind riser, And also act as the effect of pushing off the slag and exhaust.Cooled and solidified guiding groove is designed on ingate, groove guiding casting cooling is solidifying Solid direction, guiding groove size " s " size be according to casting nozzle diameter " D " determine, i.e. s=nD, n are coefficient, in casting wall Thick thicker part and peak set rising head, can be more preferable using insulated feeder effect.
- A kind of 4. heat-resisting alloy steel thin-wall pipe sand casting process according to claim 1, it is characterised in that：Step b In, casting is heat resisting steel, preferably with phenolic sand molding (core), on the premise of sand core strength is ensured, on core center line Place straw rope or wood chip, can also be fabricated to along core center line it is hollow, to ensure that core has enough gas permeabilities and yielding Property.
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| CN201710613314.2A CN107385282A (en) | 2017-07-25 | 2017-07-25 | A kind of heat-resisting alloy steel thin-wall pipe sand casting process |
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| CN201710613314.2A CN107385282A (en) | 2017-07-25 | 2017-07-25 | A kind of heat-resisting alloy steel thin-wall pipe sand casting process |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108130469A (en) * | 2017-12-20 | 2018-06-08 | 吴方立 | Antiscour, anti-corrosive alloy material and its smelting technology |
| CN108425343A (en) * | 2018-02-08 | 2018-08-21 | 佛山杰致信息科技有限公司 | A kind of manufacturing method of the vertical water sealing structure of hydraulic engineering |
| CN108889902A (en) * | 2018-07-20 | 2018-11-27 | 中国航发哈尔滨东安发动机有限公司 | A method of improving casting sand type deformability |
| CN109482814A (en) * | 2018-12-18 | 2019-03-19 | 中车长江铜陵车辆有限公司 | For the curb girder casting method on railway passenger train framework composition |
| CN110791684A (en) * | 2019-10-31 | 2020-02-14 | 江苏标新工业有限公司 | Manufacturing process of large-caliber inner container of high-temperature-resistant corrosion-resistant nickel-based alloy heat treatment furnace |
| CN111761025A (en) * | 2020-05-26 | 2020-10-13 | 洛阳中重铸锻有限责任公司 | Anti-deformation casting method for thin-wall curved-surface steel casting |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109482814A (en) * | 2018-12-18 | 2019-03-19 | 中车长江铜陵车辆有限公司 | For the curb girder casting method on railway passenger train framework composition |
| CN110791684A (en) * | 2019-10-31 | 2020-02-14 | 江苏标新工业有限公司 | Manufacturing process of large-caliber inner container of high-temperature-resistant corrosion-resistant nickel-based alloy heat treatment furnace |
| CN110791684B (en) * | 2019-10-31 | 2021-09-14 | 江苏标新工业有限公司 | Manufacturing process of large-caliber inner container of high-temperature-resistant corrosion-resistant nickel-based alloy heat treatment furnace |
| CN111761025A (en) * | 2020-05-26 | 2020-10-13 | 洛阳中重铸锻有限责任公司 | Anti-deformation casting method for thin-wall curved-surface steel casting |
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