CN101444830A - Method for casting elevator gray cast-iron scored pulley - Google Patents
Method for casting elevator gray cast-iron scored pulley Download PDFInfo
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- CN101444830A CN101444830A CNA2007101711833A CN200710171183A CN101444830A CN 101444830 A CN101444830 A CN 101444830A CN A2007101711833 A CNA2007101711833 A CN A2007101711833A CN 200710171183 A CN200710171183 A CN 200710171183A CN 101444830 A CN101444830 A CN 101444830A
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- gray cast
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- 238000005266 casting Methods 0.000 title claims abstract description 33
- 229910001060 Gray iron Inorganic materials 0.000 title claims abstract description 18
- 238000000034 method Methods 0.000 title claims abstract description 18
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 78
- 229910052742 iron Inorganic materials 0.000 claims abstract description 38
- 238000002844 melting Methods 0.000 claims abstract description 18
- 230000008018 melting Effects 0.000 claims abstract description 18
- 238000009413 insulation Methods 0.000 claims abstract description 10
- 239000000919 ceramic Substances 0.000 claims abstract description 9
- 238000011081 inoculation Methods 0.000 claims abstract description 9
- 239000000203 mixture Substances 0.000 claims abstract description 8
- 238000010079 rubber tapping Methods 0.000 claims abstract description 8
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 6
- 239000010959 steel Substances 0.000 claims abstract description 6
- OOJQNBIDYDPHHE-UHFFFAOYSA-N barium silicon Chemical compound [Si].[Ba] OOJQNBIDYDPHHE-UHFFFAOYSA-N 0.000 claims abstract description 5
- 229910000805 Pig iron Inorganic materials 0.000 claims abstract description 4
- 238000004140 cleaning Methods 0.000 claims abstract description 4
- 230000006698 induction Effects 0.000 claims abstract description 4
- 239000007788 liquid Substances 0.000 claims description 33
- 229910052710 silicon Inorganic materials 0.000 claims description 13
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 10
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 10
- 239000010703 silicon Substances 0.000 claims description 10
- 239000000126 substance Substances 0.000 claims description 7
- 239000012535 impurity Substances 0.000 claims description 6
- 238000000465 moulding Methods 0.000 claims description 5
- 239000002893 slag Substances 0.000 claims description 5
- 229910052788 barium Inorganic materials 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 238000003723 Smelting Methods 0.000 claims description 2
- 239000003795 chemical substances by application Substances 0.000 claims description 2
- 238000007667 floating Methods 0.000 claims description 2
- 239000004576 sand Substances 0.000 abstract description 6
- 238000001816 cooling Methods 0.000 abstract description 5
- 230000008901 benefit Effects 0.000 abstract description 2
- 239000006260 foam Substances 0.000 abstract description 2
- 238000005516 engineering process Methods 0.000 description 8
- 230000000630 rising effect Effects 0.000 description 4
- 238000007689 inspection Methods 0.000 description 3
- 244000035744 Hura crepitans Species 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 229910052718 tin Inorganic materials 0.000 description 2
- 229910001018 Cast iron Inorganic materials 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 210000000078 claw Anatomy 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000003028 elevating effect Effects 0.000 description 1
- 239000007849 furan resin Substances 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 238000010183 spectrum analysis Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 239000003643 water by type Substances 0.000 description 1
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Landscapes
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
The invention relates to a method for casting an elevator gray cast-iron scored pulley. The steps comprises mixed sand modeling, mould assembly, burden melting, tapping inoculation, pouring, cooling, unpacking and casting cleaning. The step of the burden melting comprises burden configuration and melting. The burden comprises the following compositions with the weight portion: 25-35 percent of pig iron, 45-55 percent of foundry return and 15-25 percent of scrap steel. A medium frequency induction furnace is adopted for the melting at the temperature of 1,430-1,530 DEG C. The tapping inoculation comprises two steps of the blast furnace tapping of iron liquor and silicon barium inoculation. An open riser with insulation function is adopted in the pouring, and a foam ceramic filter is arranged at the bottom of the open riser. The iron liquor is poured from the open riser. A pouring cup is not provided in the invention, and only one open riser with the insulation function is adopted for reducing the size of a sand case and the iron-sand ratio, therefore, the whole cost of the casting is lowered greatly; the technical casting yield is improved from 75 percent to 94.7 percent; and the economical benefit of industries is greatly improved.
Description
Technical field
The present invention relates to casting field, particularly a kind of casting method of elevator gray cast-iron scored pulley.
Background technology
The elevating mechanism system of elevator mainly is that the function of motor is finished rolling or emitting of steel wire rope by reductor and driving wheel, thereby finishes the lifting or the decline task of elevator cab.In order to reduce the tensile load of steel wire rope, it must shuttle by several groups of mobile sheaves that are fixed on the fixed sheave on the roof and are fixed on the elevator cab, thereby the also corresponding reduction of the load of these sheaves.The material of general sheave is HT250, and its mechanical performance will satisfy tensile strength 〉=250Mpa, and body hardness HBS 〉=220, and working face wheel rim difference of hardness≤30HBS, each position of foundry goods do not allow any casting flaw and exist.Therefore how to satisfy above-mentioned specification requirement, become the key of casting elevator sheave.
Summary of the invention
Technical problem to be solved by this invention is that the casting technique of sheave class foundry goods is reformed and innovated, a kind of casting method of brand-new elevator gray cast-iron scored pulley is proposed, so that the elevator sheave of producing is when satisfying specification requirement, simplify casting technique, improve product yield, increase economic efficiency.
For achieving the above object, technical scheme of the present invention is:
A kind of casting method of elevator gray cast-iron scored pulley, its step comprise mulling moulding, mould assembly, furnace charge melting, tap a blast furnace breed, pour into a mould, cool off, unpack, foundry goods, cleaning, quality inspection; It is characterized in that: described furnace charge melting step comprises configuration furnace charge and melting, and the weight proportion of furnace charge is: 25～35% the pig iron, 45～55% foundry return, 15～25% steel scrap; Institute's furnace burdening adopts medium-frequency induction furnace to carry out the melting of iron liquid, and smelting temperature is 1430～1530 ℃; Described tapping a blast furnace bred operation and comprised that iron liquid comes out of the stove and two steps of silicon barium inoculation, and wherein, described cast operation adopts the open riser that heat insulation function is arranged, and in the bottom of open riser floamed ceramics filtrating piece is set, and iron liquid pours into from open riser.
Further, the adding total amount that described silicon barium breeds the used silicon titanate innoculant of step is 0.3～0.7% of the melting amount of tapping a blast furnace, and the chemical composition mass percent of silicon titanate innoculant is: Si 60～70%, Ca 0.8～2.2%, Ba 4.0～6.0%, and Al 1.0～2.0%, the Fe surplus.
The granularity of silicon titanate innoculant is 5～10mm.
In addition, the final chemical composition mass percent of iron liquid is after the inoculation of the present invention: C 2.8～3.2%, and Si 1.9～2.3%, and Mn 0.8～1.1%, P≤0.10%, and S 0.6～0.9%, and Cu 0.8～1.2%, and Sn 0.02～0.05%, the Fe surplus.
Described mould assembly operation is included in the preceding bottom of floamed ceramics filtrating piece being put into open riser of mould assembly; Its iron liquid casting temperature is 1330～1430 ℃ in the described cast operation.
Elevator gray cast-iron scored pulley requires separately cast test bar tensile strength 〉=250Mpa, body hardness 〉=220HB, and the cylindrical integral hardness poor≤30HB.Because this product is the elevator accessory, requires each position of foundry goods not allow casting flaws such as any knockout, pore, cold shut, shrinkage porosite and slag inclusion, and after the cylindrical processing belt grooves, casting flaws such as slag inclusion, shrinkage porosite, pore must not be arranged.
The difference of technology of the present invention and conventional cast technology maximum is do not have cup, sprue, cross gate, the special-purpose rising head of ingate, but adopt an open riser that heat insulation function is arranged, and it is taken as cup again, directly pours into a mould from the middle wheel hub of foundry goods.
During common process design running gate system, the die joint that iron liquid is surveyed outside the wheel rim of sheave through cup sprue, cross gate and ingate enters die cavity, and for product does not produce shrinkage porosite, adds one to two feeding head between wheel rim and ingate.Though this technology also can obtain not have the foundry goods of shrinkage defect, but the temperature field that the greatest problem that exists is an iron liquid to be full of behind the die cavity is very inhomogeneous, the temperature height that is connected the rim section that with rising head, rim section temperature away from the rising head junction is low, the part cooling velocity that temperature is high is slow, thereby hardness is on the low side; The part cooling velocity that temperature is low is fast, causes hardness higher.Like this, the requirement of product rim section uniformity of hardness just can not reach.This technology rim section hardness value difference reaches more than the 40HB.The inhomogeneous of cooling velocity also caused uneven internal stress to cast product.
Eliminate the problem that above-mentioned conventional casting brings, will try every possible means to allow the iron liquid that pours into die cavity be full of the rim section of product simultaneously exactly as far as possible, pour into iron liquid from wheel hub and just can reach this purpose.The present invention that Here it is selects from the reason of the open riser cast iron liquid of foundry goods wheel hub top.The open riser here is taken as again and waters rim of a cup usefulness.It is made with insulation material, is in the condition of high temperature so that guarantee rising head, reaches to emit the eloquence final set after the foundry goods various piece is solidified, and does not produce shrinkage defect to guarantee each position of foundry goods.
In order to guarantee casting quality, in the insulation cup, put the foam ceramic filter net, the screen pack effect has 2 points: when 1, the impurity in the iron liquid is by screen pack, stick effect by machinery, impurity is kept off outside foundry goods; Flow velocity can slow down to some extent when 2, iron liquid was by screen pack, and had a rectified action, made iron liquid to enter die cavity stably, avoided producing phenomenons such as sand washing, volume gas.
Beneficial effect of the present invention:
1) operation is more simple;
2) owing to there is not traditional running gate system, can reduce the sandbox size, reduce the iron sand ratio, reduce cost;
3) remove traditional cup, sprue, cross gate and ingate, and only adopted an open riser that heat insulation function is arranged, made the whole cost of foundry goods reduce greatly;
4) only adopt an open riser that heat insulation function is arranged, iron liquid is placed with the floamed ceramics filtrating piece from this bottom and pours into, and has so just reduced the sandbox size, has reduced the placer iron ratio, simultaneously product yield brings up to 94.7% by original 75%, thereby has improved the business economic benefit greatly;
5) casting yield height, former technology always occur the shrinkage porosite problem in processing after the belt grooves, do not find the shrinkage porosite problem after adopting this technology;
6) the whole uniformity of foundry goods cylindrical is very good, and integral hardness is poor≤20HB;
7) the elevator gray cast-iron scored pulley tensile strength 〉=250Mpa that produces, product body hardness HBS 〉=220, and working face wheel rim difference of hardness≤30HBS.
Description of drawings
Fig. 1 is the schematic diagram of elevator gray cast-iron scored pulley of the present invention;
Fig. 2 is elevator gray cast-iron scored pulley casting schematic diagram of the present invention.
The specific embodiment
Embodiment 1
Elevator gray cast-iron scored pulley casting method of the present invention comprises the steps:
(1) mulling moulding, mould assembly
Wheel hub shaping case 1 adopts furan resin self curing sand mulling moulding, molding then, repair type, coat, place floamed ceramics filtrating piece 3, mo(u)ld top half 11, mo(u)ld bottom half 12 mould assemblys then in open riser 2 bottoms of mo(u)ld top half 11, with to be cast behind the tight case of bolt etc., referring to Fig. 1, Fig. 2;
(2) furnace charge melting
Dispose furnace charge earlier, the weight proportion of furnace charge is: contain 30% the pig iron, 50% foundry return, 20% steel scrap; Then the furnace charge that configures is dropped into medium-frequency induction furnace and carry out the melting of iron liquid, when temperature reaches 1450 ℃ after iron liquid has melted, carry out iron liquid sampling spectral analysis, afterwards the chemical composition debugging mode of original iron melt to prescribed limit, and iron liquid is warmed up to 1520 ℃ of maximum temperatures, and leave standstill insulation 5～10 minutes, allow impurity in the iron liquid is fully floating to come up, claw with poly-slag agent gathering, do not allow these impurity bands in the iron liquid of handling.
(3) tap a blast furnace and breed
Specific practice is that the iron liquid temp that superheating and standing is crossed is dropped to 1430 ℃, taps a blast furnace then, carries out inoculation along with iron liquid stream adds silicon titanate innoculant in the liquid that taps a blast furnace; The granularity of the silicon titanate innoculant that adds is 5～10mm, and the total amount of the silicon titanate innoculant of adding is 0.6% of the melting amount of tapping a blast furnace, and the chemical composition mass percent of silicon titanate innoculant is: Si 65%, Ca 2.0%, Ba 5%, Al 1.5% and Fe surplus; The final chemical composition of iron liquid is after the inoculation: the Fe of Ca 3.0%, Si 2.1%, Mn 0.9%, P 0.065%, S 0.075%, Cu 1.0%, Sn 0.035% and surplus.
(4) cast
Adopt to put down and water the teeming pouring technology, iron liquid directly pours into from open riser, in the open riser bottom floamed ceramics filtrating piece is set and carries out pushing off the slag; Wherein pouring temperature is controlled at 1380 ℃.
(5) cooling, unpacking
(6) casting cleaning
(7) quality inspection
Quality inspection is underproofly eliminated when waste product, the qualified casting finished products storehouse that enters.
The main technologic parameters of table 1 several embodiments of the present invention
The technical process of embodiment 2,3,4,5 repeats no more with embodiment 1.
Claims (7)
1. the casting method of elevator gray cast-iron scored pulley, its step comprise mulling moulding, mould assembly, furnace charge melting, tap a blast furnace breed, pour into a mould, cool off, unpack, casting cleaning; It is characterized in that: described furnace charge melting step comprises configuration furnace charge and melting, and the weight proportion of furnace charge is: 25～35% the pig iron, 45～55% foundry return, 15～25% steel scrap; Institute's furnace burdening adopts medium-frequency induction furnace to carry out the melting of iron liquid, and smelting temperature is 1430～1530 ℃; Described tapping a blast furnace bred operation and comprised that iron liquid comes out of the stove and two steps of silicon barium inoculation, and wherein, described cast operation adopts the open riser that heat insulation function is arranged, and in the bottom of open riser floamed ceramics filtrating piece is set, and iron liquid pours into from open riser.
2. the casting method of elevator gray cast-iron scored pulley as claimed in claim 1 is characterized in that, described mould assembly operation is included in the preceding bottom of floamed ceramics filtrating piece being put into open riser of mould assembly.
3. the casting method of elevator gray cast-iron scored pulley as claimed in claim 1 is characterized in that, the iron liquid casting temperature is 1330～1430 ℃ in the described cast operation.
4. the casting method of elevator gray cast-iron scored pulley as claimed in claim 1, it is characterized in that, the adding total amount that described silicon barium breeds the used silicon titanate innoculant of step is 0.3～0.7% of the melting amount of tapping a blast furnace, the chemical composition mass percent of silicon titanate innoculant is: Si 60～70%, Ca 0.8～2.2%, Ba 4.0～6.0%, and Al 1.0～2.0%, the Fe surplus.
5. the casting method of elevator gray cast-iron scored pulley as claimed in claim 4 is characterized in that, the granularity of silicon titanate innoculant is 5～10mm.
6. the casting method of elevator gray cast-iron scored pulley as claimed in claim 1, it is characterized in that, the final chemical composition mass percent of iron liquid is after the inoculation: C 2.8～3.2%, Si 1.9～2.3%, and Mn 0.8～1.1%, P≤0.10%, S 0.6～0.9%, Cu 0.8～1.2%, Sn0.02～0.05%, Fe surplus.
7. the casting method of elevator gray cast-iron scored pulley as claimed in claim 1 is characterized in that, leaves standstill insulation 5～10 minutes after the melting of iron liquid, allows impurity in the iron liquid is fully floating to come up, and clawing with poly-slag agent gathering, does not allow these impurity bands in the iron liquid of processing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007101711833A CN101444830B (en) | 2007-11-28 | 2007-11-28 | Method for casting elevator gray cast-iron scored pulley |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007101711833A CN101444830B (en) | 2007-11-28 | 2007-11-28 | Method for casting elevator gray cast-iron scored pulley |
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| Publication Number | Publication Date |
|---|---|
| CN101444830A true CN101444830A (en) | 2009-06-03 |
| CN101444830B CN101444830B (en) | 2010-12-08 |
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| CN2007101711833A Expired - Fee Related CN101444830B (en) | 2007-11-28 | 2007-11-28 | Method for casting elevator gray cast-iron scored pulley |
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102451904A (en) * | 2010-11-01 | 2012-05-16 | 上海华新合金有限公司 | Casting method of body casting of centrifugal air compressor |
| CN102527943A (en) * | 2012-03-30 | 2012-07-04 | 辉县市汽车配件有限责任公司 | Overhead choke-flow filter buffer type casting pouring technological method |
| CN101987348B (en) * | 2009-08-06 | 2012-12-19 | 上海华新合金有限公司 | Method for casting road roller bracket casting |
| CN103464693A (en) * | 2013-09-18 | 2013-12-25 | 苏州市通润机械铸造有限公司 | Casting technology capable of reducing hardness difference of traction wheel rope groove face |
| CN103600032A (en) * | 2013-03-05 | 2014-02-26 | 南通华东油压科技有限公司 | Dedicated riser for manufacturing technology of walking machinery bracket casting |
| CN103668333A (en) * | 2012-08-31 | 2014-03-26 | 沈阳铝镁设计研究院有限公司 | Low-phosphorous low-sulfur gray pig iron formula for aluminum anode assembly and production method thereof |
| CN103846391A (en) * | 2014-03-10 | 2014-06-11 | 长沙金龙铸造实业有限公司 | Production method of traction sheave of elevator |
| CN103862000A (en) * | 2014-04-04 | 2014-06-18 | 江苏力源金河铸造有限公司 | Vertical parting horizontal pouring casting technology for end cover casting core shell |
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- 2007-11-28 CN CN2007101711833A patent/CN101444830B/en not_active Expired - Fee Related
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| CN102451904A (en) * | 2010-11-01 | 2012-05-16 | 上海华新合金有限公司 | Casting method of body casting of centrifugal air compressor |
| CN102451904B (en) * | 2010-11-01 | 2013-09-25 | 上海华新合金有限公司 | Casting method of body casting of centrifugal air compressor |
| CN102527943A (en) * | 2012-03-30 | 2012-07-04 | 辉县市汽车配件有限责任公司 | Overhead choke-flow filter buffer type casting pouring technological method |
| CN103668333B (en) * | 2012-08-31 | 2016-04-13 | 沈阳铝镁设计研究院有限公司 | Aluminium anode assembling low-phosphorous low-sulfur gray pig iron formula and production method |
| CN103668333A (en) * | 2012-08-31 | 2014-03-26 | 沈阳铝镁设计研究院有限公司 | Low-phosphorous low-sulfur gray pig iron formula for aluminum anode assembly and production method thereof |
| CN103600032A (en) * | 2013-03-05 | 2014-02-26 | 南通华东油压科技有限公司 | Dedicated riser for manufacturing technology of walking machinery bracket casting |
| CN103464693B (en) * | 2013-09-18 | 2015-11-04 | 苏州市通润机械铸造有限公司 | A kind of casting technique reducing traction sheave grooving surface hardness difference |
| CN103464693A (en) * | 2013-09-18 | 2013-12-25 | 苏州市通润机械铸造有限公司 | Casting technology capable of reducing hardness difference of traction wheel rope groove face |
| CN103846391A (en) * | 2014-03-10 | 2014-06-11 | 长沙金龙铸造实业有限公司 | Production method of traction sheave of elevator |
| CN103846391B (en) * | 2014-03-10 | 2016-01-20 | 长沙金龙铸造实业有限公司 | A kind of production method of elevator traction sheave |
| CN103862000B (en) * | 2014-04-04 | 2016-04-27 | 江苏力源金河铸造有限公司 | A kind of end cap foundry goods core shell vertical-parting casting on flat casting technique |
| CN103862000A (en) * | 2014-04-04 | 2014-06-18 | 江苏力源金河铸造有限公司 | Vertical parting horizontal pouring casting technology for end cover casting core shell |
| CN103920857B (en) * | 2014-05-06 | 2015-11-18 | 南通华东油压科技有限公司 | A kind of casting method of agricultural combine three-way valve body |
| CN103920857A (en) * | 2014-05-06 | 2014-07-16 | 南通华东油压科技有限公司 | Casting method of three-way valve body of agricultural combined machine |
| CN107052251A (en) * | 2016-12-31 | 2017-08-18 | 邓锦志 | Filter residue casting rising head |
| CN106825412A (en) * | 2017-02-14 | 2017-06-13 | 王伟红 | A kind of new precision casting mould |
| CN107626892A (en) * | 2017-09-21 | 2018-01-26 | 宁波市平熔金属制品有限公司 | A kind of power plant's dragveyer rich chromium cast iron idle pulley runner less apparatus for pouring |
| CN107626892B (en) * | 2017-09-21 | 2024-04-12 | 宁波市平熔金属制品有限公司 | Pouring device without pouring channel for high-chromium cast iron idler wheel of power plant slag conveyor |
| CN108645685A (en) * | 2018-04-23 | 2018-10-12 | 武汉泛洲中越合金有限公司 | A kind of preparation facilities and its method of spectrum control sample |
| CN110396639A (en) * | 2019-07-10 | 2019-11-01 | 广西大学 | A kind of preparation method of gray cast iron |
| CN114713774A (en) * | 2022-04-11 | 2022-07-08 | 邢台轧辊沃川装备制造有限公司 | Production method of high-strength heat-resistant gray cast iron furnace door frame |
| CN114713774B (en) * | 2022-04-11 | 2023-12-15 | 邢台轧辊沃川装备制造有限公司 | Production method of high-strength heat-resistant gray cast iron furnace door frame |
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| Publication number | Publication date |
|---|---|
| CN101444830B (en) | 2010-12-08 |
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