CN1759958A - Heat preservation agent in use for molded casting, and producing technique - Google Patents
Heat preservation agent in use for molded casting, and producing technique Download PDFInfo
- Publication number
- CN1759958A CN1759958A CN 200510049440 CN200510049440A CN1759958A CN 1759958 A CN1759958 A CN 1759958A CN 200510049440 CN200510049440 CN 200510049440 CN 200510049440 A CN200510049440 A CN 200510049440A CN 1759958 A CN1759958 A CN 1759958A
- Authority
- CN
- China
- Prior art keywords
- heat preservation
- preservation agent
- molded casting
- described heat
- composition
- 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
- 238000005266 casting Methods 0.000 title claims abstract description 16
- 238000004321 preservation Methods 0.000 title claims description 30
- 238000000034 method Methods 0.000 title description 3
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 33
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 26
- 239000010959 steel Substances 0.000 claims abstract description 26
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 18
- 239000007800 oxidant agent Substances 0.000 claims abstract description 7
- 230000001590 oxidative effect Effects 0.000 claims abstract description 6
- 239000000843 powder Substances 0.000 claims description 29
- 239000000203 mixture Substances 0.000 claims description 28
- 239000000463 material Substances 0.000 claims description 11
- 239000004411 aluminium Substances 0.000 claims description 10
- 229910052782 aluminium Inorganic materials 0.000 claims description 10
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 10
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 9
- 229940067573 brown iron oxide Drugs 0.000 claims description 9
- 239000010439 graphite Substances 0.000 claims description 9
- 229910002804 graphite Inorganic materials 0.000 claims description 9
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 8
- 229910052751 metal Inorganic materials 0.000 claims description 6
- 239000002184 metal Substances 0.000 claims description 6
- 239000000428 dust Substances 0.000 claims description 5
- 239000002893 slag Substances 0.000 claims description 5
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 4
- 238000005516 engineering process Methods 0.000 claims description 4
- 239000002245 particle Substances 0.000 claims description 4
- 238000005303 weighing Methods 0.000 claims description 4
- 229910000519 Ferrosilicon Inorganic materials 0.000 claims description 3
- OSMSIOKMMFKNIL-UHFFFAOYSA-N calcium;silicon Chemical compound [Ca]=[Si] OSMSIOKMMFKNIL-UHFFFAOYSA-N 0.000 claims description 3
- 229910052742 iron Inorganic materials 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 239000011819 refractory material Substances 0.000 claims description 3
- 230000008961 swelling Effects 0.000 claims description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 2
- 238000010521 absorption reaction Methods 0.000 claims description 2
- HIGRAKVNKLCVCA-UHFFFAOYSA-N alumine Chemical compound C1=CC=[Al]C=C1 HIGRAKVNKLCVCA-UHFFFAOYSA-N 0.000 claims description 2
- 239000011449 brick Substances 0.000 claims description 2
- 239000010941 cobalt Substances 0.000 claims description 2
- 229910017052 cobalt Inorganic materials 0.000 claims description 2
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 claims description 2
- 229910052802 copper Inorganic materials 0.000 claims description 2
- 239000010949 copper Substances 0.000 claims description 2
- 229910052593 corundum Inorganic materials 0.000 claims description 2
- 239000010431 corundum Substances 0.000 claims description 2
- 238000010348 incorporation Methods 0.000 claims description 2
- 229910052759 nickel Inorganic materials 0.000 claims description 2
- 238000012856 packing Methods 0.000 claims description 2
- 238000005453 pelletization Methods 0.000 claims description 2
- 238000009628 steelmaking Methods 0.000 claims description 2
- 229910052902 vermiculite Inorganic materials 0.000 claims description 2
- 239000010455 vermiculite Substances 0.000 claims description 2
- 235000019354 vermiculite Nutrition 0.000 claims description 2
- 229910052799 carbon Inorganic materials 0.000 abstract description 10
- 238000005204 segregation Methods 0.000 abstract description 5
- 239000004067 bulking agent Substances 0.000 abstract 1
- 239000007769 metal material Substances 0.000 abstract 1
- 239000003755 preservative agent Substances 0.000 description 5
- 238000004458 analytical method Methods 0.000 description 3
- 238000004512 die casting Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000003500 flue dust Substances 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 2
- 239000005864 Sulphur Substances 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 229910002651 NO3 Inorganic materials 0.000 description 1
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 1
- 229910000746 Structural steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000005058 metal casting Methods 0.000 description 1
- 230000000505 pernicious effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Landscapes
- Compositions Of Oxide Ceramics (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
A heating-insulating agent for the mould casting to prevent the shrinkage cavities on the end of steel ingot and carbon segregation is prepared from heat-generating metal material (12-18 Wt%), oxidant (15-55), slag-forming agent (15-35) and bulking agent (15-25) through proportional mixing.
Description
Technical field
The invention belongs to the metal casting technical field, particularly relate in the structural steel die casting process, for reducing the ingot head shrinkage cavity and improving the heat preservation agent that the carbon component segregation adds in the steel ingot.
Background technology
At present, the exothermic mixture and the heat preserving agent that use in cap oral area position in the die casting separate, and during use, add exothermic mixture on cap portion molten metal surface earlier, cover one deck refractory material then again as heat preserving agent on exothermic mixture, manipulate trouble; And use amount is limited by volume space, and it is shorter to keep high-temperature time, and the anti-composition segregation effect of anti-shrinkage cavity is not good enough; In addition, existing exothermic mixture generally by chemical oxidizing agents such as heating such as ferrosilicon, calcium-silicon or aluminium alloy metal and nitrate, form, and in use, can decompose many pernicious gases of generation and dust polluting environment by slag former.
Summary of the invention
The technical problem that quasi-solution of the present invention is determined is: for founding iron mold provides a kind of heat preservation agent that exothermic mixture and heat preserving agent are combined into one, the operation to cap portion interpolation exothermic mixture and heat preserving agent becomes more easy in the die casting process thereby not only make, and prolongation high-temperature holding time, improve ingot head shrinkage cavity and anti-carbon composition segregation effect better, in use can not produce the gas and the dust of contaminated environment simultaneously.
Technical solution of the present invention is: it is made up of one group of unsetting composition, and the composition of said composition and proportion of composing by weight percentage thereof are:
Metal exothermic material 12～18%
Oxidant 15～55%
Swelling agent 15～25%
Slag former 15～35%
In above-mentioned prescription, the metal exothermic material can adopt ferrosilicon powder or silicon calcium powder, aluminium powder etc., preferred aluminium powder.The application quality index of aluminium powder is: Al 〉=90%, and granularity≤2mm, wherein the particle less than 0.088mm is not more than 10%.
In the prescription oxidant be at high temperature with metal exothermic material generation chemical reaction, produce a large amount of heats.This oxidant can adopt oxide powder of brown iron oxide or Iron Ore Powder or copper, nickel, cobalt etc.Preferred iron oxide and steel mill are bearing dust-collected.The application quality index of brown iron oxide is: Fe
2O
3〉=90%, granularity≤1mm, wherein＜particle of 0.5mm is not less than 80%.Steel mill is bearing dust-collected to be the fine powder of collecting through dust pelletizing system in electric furnace, the converter steelmaking process, and the application quality index is: granularity≤0.5mm, wherein＜fine powder of 0.088mm is no less than 50%, absorption moisture content≤1.0%.
Slag former mainly is the stability that keeps the exothermic mixture volume in the prescription, and adoptable material has refractory materials such as alumine, corundum fine powder, high-alumina brick broken material.Preferred high alumina fine powder, its application quality index is: Al
2O
3〉=60%, granularity≤2mm.
Swelling agent adopts expansible graphite and expanded vermiculite in the prescription, and it mainly acts on is instantaneous expansion to become vermiform and form heat-insulation layer under the high temperature, and the application quality index of expansible graphite is: allowance for expansion 〉=60ml/g, ash content≤18%, pH value=3～5.
According to the above, preferred composition of heat preservation agent of the present invention and proportion of composing by weight percentage thereof are:
Aluminium powder 12～18%
Brown iron oxide 15～24%
Steel mill bearing dust-collected 18～30%
Expansible graphite 18～25%
High alumina fine powder 18～25%
The production technology of heat preservation agent in use for molded casting of the present invention is: after each acceptable material is pressed the proportion of composing weighing, all drop in the planetary-type mixer and mix, total incorporation time is no less than 10 minutes, and even mixed composition is finished product, carries out weighing, packing.
The invention has the beneficial effects as follows: when this composition uses, not only produce a large amount of heats, self inflation simultaneously forms heat-insulation layer, therefore high-temperature holding time is long, can effectively reduce head shrinkage cavity, inner inclusion, the center porosity of steel ingot, improve the steel ingot lumber recovery, and improve the carbon component segregation; Raw material extensively is easy to get, it is all easy to produce use, and in use can not produce the gas and the dust of contaminated environment, and it is discrete successfully to have solved former exothermic mixture and heat preserving agent, manipulate trouble, and use amount is subjected to the volume space restriction and causes the not good enough problem of heat preservation effect.
Specific embodiments
Embodiment 1, and heat preservation agent component and percentage by weight thereof are:
Aluminium powder 15%
Brown iron oxide 15%
Steel mill bearing dust-collected 30%
High alumina fine powder 22%
Expansible graphite 18%
Being used to pour into a mould steel grade is MnCr5 series and 20CrMoTi 2.3t steel ingot, drop into heat preservation agent during to the ingot head opening position in molten steel rises, consumption is that 6Kg/ props up steel ingot, result of the test, every stove is appointed and is got two and become the base steel ingot, the head blank near cap oral area position coupongs each 1, at every sample along diagonal edges 1/4 and sampling core, bore sample and use φ 6 drill bits, adopt infrared analysis, the average deviation that gets carbon is 0.017%, and the average deviation of sulphur is 0.001%, its carbon, sulphur stable components, deviation is in control range.And in actual use, no flue dust takes place.
Embodiment 2, and heat preservation agent component and percentage by weight thereof are
Aluminium powder 12%
Brown iron oxide 20%
Steel mill bearing dust-collected 18%
High alumina fine powder 25%
Expansible graphite 25%
Be used to pour into a mould steel grade R49MNVS
3The 2.3t steel ingot, consumption is that 6Kg/ props up steel ingot, drop into heat preservation agent during to the ingot head opening position in molten steel rises, use through four stoves, take a sample to the carbon analysis of components from ingot head, all in the critical field of Δ C≤0.05%, its average deviation is 0.0338% to the carbon deviation in same cross section, and no flue dust takes place in the use.
Embodiment 3, and heat preservation agent component and percentage by weight thereof are
Aluminium powder 18%
Brown iron oxide 24%
Steel mill bearing dust-collected 20%
High alumina fine powder 18%
Expansible graphite 20%
Be used to pour into a mould the 2.3t steel ingot that steel grade is RNQT90, drop into above-mentioned heat preservation agent during to the ingot head opening position in molten steel rises, consumption is that 6Kg/ props up steel ingot, use through 10 stoves, take a sample to the carbon analysis of components from ingot head, the carbon deviation delta C in same cross section all in≤0.05% critical field, average deviation Δ C
AllBe 0.027%, no flue dust takes place in the use.
Claims (12)
1, a kind of heat preservation agent in use for molded casting is one group of unsetting composition, it is characterized in that the composition of said composition and proportion of composing by weight percentage thereof are:
Metal exothermic material 12～18%
Oxidant 15～55%
Swelling agent 15～25%
Slag former 15～35%
2, by the described heat preservation agent in use for molded casting of claim 1, it is characterized in that the exothermic material in the heat preservation agent composition can be ferrosilicon powder or silicon calcium powder or aluminium powder.
3,, it is characterized in that oxidant in the heat preservation agent composition can be brown iron oxide or Iron Ore Powder or steel plant's flue is bearing dust-collected or the oxide powder of copper, nickel, cobalt by the described heat preservation agent in use for molded casting of claim 1.
4, by the described heat preservation agent in use for molded casting of claim 1, it is characterized in that the slag former in the heat preservation agent composition can be refractory materials such as alumine, corundum fine powder, high-alumina brick broken material.
5, by the described heat preservation agent in use for molded casting of claim 1, it is characterized in that the expanding material in the heat preservation agent composition is expansible graphite or expanded vermiculite.
6, by power power requirement 1 described heat preservation agent in use for molded casting, it is characterized in that the preferred composition of heat preservation agent composition and by weight percentage proportion of composing be:
Aluminium powder 12～18%
Brown iron oxide 15～24%
Steel mill bearing dust-collected 18～30%
High alumina fine powder 18～25%
Expansible graphite 18～25%.
7,, it is characterized in that the quality index of aluminium powder is in the component by the described heat preservation agent in use for molded casting of claim 6: Al 〉=90%, granularity≤2mm, wherein＜particle of 0.088mm is not more than 10%.
8, by the described heat preservation agent in use for molded casting of claim 6, it is characterized in that the quality index of brown iron oxide is in the component: Fe
2O
3〉=90%, granularity≤1mm, wherein＜particle of 0.5mm is no less than 80%.
9, by the described heat preservation agent in use for molded casting of claim 6, it is characterized in that steel mill in the component bearing dust-collected be the fine powder of collecting through dust pelletizing system in electric furnace, the converter steelmaking process, quality index is: granularity≤0.5mm, wherein＜fine powder of 0.088mm is no less than 50%, absorption moisture content≤1.0%.
10, by the described heat preservation agent in use for molded casting of claim 6, it is characterized in that the quality index of high alumina fine powder in the component is: Al
2O
3〉=60%, granularity≤2mm.
11, by the described heat preservation agent in use for molded casting of claim 6, it is characterized in that the quality index of expansible graphite in the component is: allowance for expansion 〉=60ml/g, ash content≤18%, pH value are 3～5.
12, press the production technology of the described heat preservation agent in use for molded casting of claim 1, it is characterized in that with each acceptable material by the proportion of composing weighing after, all drop in the planetary-type mixer and mix, total incorporation time is no less than 10 minutes, even mixed composition is finished product, and carries out weighing, packing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100494407A CN1327994C (en) | 2005-03-22 | 2005-03-22 | Heat preservation agent in use for molded casting, and producing technique |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100494407A CN1327994C (en) | 2005-03-22 | 2005-03-22 | Heat preservation agent in use for molded casting, and producing technique |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1759958A true CN1759958A (en) | 2006-04-19 |
| CN1327994C CN1327994C (en) | 2007-07-25 |
Family
ID=36706246
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005100494407A Active CN1327994C (en) | 2005-03-22 | 2005-03-22 | Heat preservation agent in use for molded casting, and producing technique |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1327994C (en) |
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101811178A (en) * | 2010-04-16 | 2010-08-25 | 马宪忠 | Self-heating type thermal insulation covering agent |
| CN102757240A (en) * | 2011-04-25 | 2012-10-31 | 宝山钢铁股份有限公司 | Heating panel used in steel ingot head heat insulation |
| CN102814475A (en) * | 2012-07-31 | 2012-12-12 | 马鞍山科润冶金材料有限公司 | Heating agent for casting stainless steel ingot heads and preparation method of heating agent |
| CN102825224A (en) * | 2012-07-31 | 2012-12-19 | 马鞍山科润冶金材料有限公司 | Composite heat generating agent for weathering steel |
| CN103586426A (en) * | 2013-10-30 | 2014-02-19 | 吴江市液铸液压件铸造有限公司 | Thermal-insulation cover agent and preparation method thereof |
| CN104439198A (en) * | 2014-11-18 | 2015-03-25 | 重庆鑫泉机械有限公司 | Riser covering flux |
| CN106111949A (en) * | 2016-08-15 | 2016-11-16 | 哈尔滨理工大学 | A kind of casting heat preservation agent |
| CN106180660A (en) * | 2016-08-15 | 2016-12-07 | 哈尔滨理工大学 | Steel-casting riser heating and insulating agent and preparation method thereof |
| CN106939366A (en) * | 2017-03-24 | 2017-07-11 | 黎明职业大学 | Composite heating agent for carbon steel |
| CN108127092A (en) * | 2016-12-01 | 2018-06-08 | 铜山县超特有色金属添加剂厂 | A kind of coverture and its preparation process |
| CN110394429A (en) * | 2019-08-19 | 2019-11-01 | 郑州东升冶金新材料有限公司 | A kind of riser head heat-preserving coverture and preparation method thereof |
| CN110526618A (en) * | 2019-09-06 | 2019-12-03 | 天津凯星科技有限公司 | A kind of feeding element and manufacturing method and feeding head |
| CN111299531A (en) * | 2020-04-09 | 2020-06-19 | 安徽工业大学 | Process method for improving quality and yield of continuous casting tail billet |
| CN111331092A (en) * | 2020-04-09 | 2020-06-26 | 安徽工业大学 | Preparation method of metallurgical exothermic agent for continuous casting tailing blank |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102091758B (en) * | 2011-02-24 | 2012-12-05 | 河南省鑫龙冶材集团有限公司 | Novel die cast cap port sphere composite heating agent and production method thereof |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1008798B (en) * | 1987-11-04 | 1990-07-18 | 唐国进 | Exothermic, slag trapping and insulating covering agent |
| CN1302704A (en) * | 1999-10-22 | 2001-07-11 | 吕安明 | Granular insulating agent for covering cover ladle |
| CN1159124C (en) * | 2001-12-06 | 2004-07-28 | 马晓明 | Granular heat-insulating agent and its production process |
-
2005
- 2005-03-22 CN CNB2005100494407A patent/CN1327994C/en active Active
Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101811178A (en) * | 2010-04-16 | 2010-08-25 | 马宪忠 | Self-heating type thermal insulation covering agent |
| CN102757240A (en) * | 2011-04-25 | 2012-10-31 | 宝山钢铁股份有限公司 | Heating panel used in steel ingot head heat insulation |
| CN102814475A (en) * | 2012-07-31 | 2012-12-12 | 马鞍山科润冶金材料有限公司 | Heating agent for casting stainless steel ingot heads and preparation method of heating agent |
| CN102825224A (en) * | 2012-07-31 | 2012-12-19 | 马鞍山科润冶金材料有限公司 | Composite heat generating agent for weathering steel |
| CN103586426A (en) * | 2013-10-30 | 2014-02-19 | 吴江市液铸液压件铸造有限公司 | Thermal-insulation cover agent and preparation method thereof |
| CN104439198A (en) * | 2014-11-18 | 2015-03-25 | 重庆鑫泉机械有限公司 | Riser covering flux |
| CN106180660B (en) * | 2016-08-15 | 2018-10-12 | 哈尔滨理工大学 | Steel-casting riser heating and insulating agent and preparation method thereof |
| CN106111949A (en) * | 2016-08-15 | 2016-11-16 | 哈尔滨理工大学 | A kind of casting heat preservation agent |
| CN106180660A (en) * | 2016-08-15 | 2016-12-07 | 哈尔滨理工大学 | Steel-casting riser heating and insulating agent and preparation method thereof |
| CN108127092A (en) * | 2016-12-01 | 2018-06-08 | 铜山县超特有色金属添加剂厂 | A kind of coverture and its preparation process |
| CN106939366A (en) * | 2017-03-24 | 2017-07-11 | 黎明职业大学 | Composite heating agent for carbon steel |
| CN110394429A (en) * | 2019-08-19 | 2019-11-01 | 郑州东升冶金新材料有限公司 | A kind of riser head heat-preserving coverture and preparation method thereof |
| CN110526618A (en) * | 2019-09-06 | 2019-12-03 | 天津凯星科技有限公司 | A kind of feeding element and manufacturing method and feeding head |
| CN110526618B (en) * | 2019-09-06 | 2024-06-25 | 天津凯星科技有限公司 | Feeding element, manufacturing method and feeding head |
| CN111299531A (en) * | 2020-04-09 | 2020-06-19 | 安徽工业大学 | Process method for improving quality and yield of continuous casting tail billet |
| CN111331092A (en) * | 2020-04-09 | 2020-06-26 | 安徽工业大学 | Preparation method of metallurgical exothermic agent for continuous casting tailing blank |
| CN111299531B (en) * | 2020-04-09 | 2021-11-26 | 安徽工业大学 | Process method for improving quality and yield of continuous casting tail billet |
| CN111331092B (en) * | 2020-04-09 | 2022-08-02 | 安徽工业大学 | Preparation method of metallurgical exothermic agent for continuous casting tailing blank |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1327994C (en) | 2007-07-25 |
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Address after: 313000 Zhejiang city of Huzhou Province Hangzhou North Bridge Road No. 118 Patentee after: Zhejiang Hongying Group Co.,Ltd. Address before: 313000 Zhejiang city of Huzhou Province Hangzhou North Bridge Road No. 118 Patentee before: HONGYING ENTPR Co.,Ltd. HUZHOU Z |
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Denomination of invention: Heat insulating agent for mould casting and its production process Effective date of registration: 20210622 Granted publication date: 20070725 Pledgee: South Taihu New Area sub branch of Huzhou Bank Co.,Ltd. Pledgor: Zhejiang Hongying Group Co.,Ltd. Registration number: Y2021330000620 |
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Denomination of invention: Heating and insulating agent for mold casting and its production process Effective date of registration: 20220621 Granted publication date: 20070725 Pledgee: South Taihu New Area sub branch of Huzhou Bank Co.,Ltd. Pledgor: Zhejiang Hongying Group Co.,Ltd. Registration number: Y2022330001015 |
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Denomination of invention: Heat insulating agent for mold casting and its production process Effective date of registration: 20230628 Granted publication date: 20070725 Pledgee: South Taihu New Area sub branch of Huzhou Bank Co.,Ltd. Pledgor: Zhejiang Hongying Group Co.,Ltd. Registration number: Y2023980046207 |
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