CN103266271A - Powder metallurgical formula and technology - Google Patents
Powder metallurgical formula and technology Download PDFInfo
- Publication number
- CN103266271A CN103266271A CN2013102080881A CN201310208088A CN103266271A CN 103266271 A CN103266271 A CN 103266271A CN 2013102080881 A CN2013102080881 A CN 2013102080881A CN 201310208088 A CN201310208088 A CN 201310208088A CN 103266271 A CN103266271 A CN 103266271A
- Authority
- CN
- China
- Prior art keywords
- powder
- iron
- iron powder
- toughener
- electrolytic copper
- 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
Abstract
The invention provides a powder metallurgical formula and technology. The powder metallurgical formula comprises the following raw materials: 48-88 percent of atomized iron powder, 10-50 percent of reducing iron powder, 0.4-1.5 percent of graphite powder, 1-3.9 percent of electrolytic copper, 0.3-1.5 percent of micro powder paraffin, 0.1-0.9 percent of easily cut agent and 0.1-0.9 percent of enhancer. The powder metallurgical formula consists of the following steps of mixing, pressing, sintering, fining, deburring and steaming. According to the powder metallurgical formula and technology, the tensile strength and the hardness of a product are improved; and by optimization of the technical steps, the production efficiency is improved, and the waste of energy is reduced.
Description
Technical field
The present invention relates to field of powder metallurgy, refer to a kind of powder metallurgy prescription and technology especially.
Background technology
Powder metallurgy be produce metal or with metal-powder as raw material, through being shaped and sintering, make the Technology of metallic substance, matrix material and all kinds goods.Because the advantage of powder metallurgy technology, it has become the key that solves the novel material problem, plays a part very important in the development of novel material.Yet existing powder metallurgy prescription and technology still have limitation, and processing step is various to have caused the low of the waste of the energy and production efficiency, and product also exists tensile strength and the lower problem of hardness simultaneously.
Summary of the invention
The present invention proposes a kind of powder metallurgy prescription, has solved product tensile strength and the lower problem of hardness in the prior art.
The present invention proposes a kind of technology of powder metallurgy prescription, has solved in the prior art because the various energy dissipation that causes of processing step and the low problem of production efficiency.
Technical scheme of the present invention is achieved in that
A kind of powder metallurgy prescription, evenly mix iron-based powder by water-atomized iron powder, reduced iron powder, Graphite Powder 99, electrolytic copper, micro mist wax, easy cutting agent and toughener, in the described iron-based powder, be measure unit by weight, described water-atomized iron powder is 48% to 88%, reduced iron powder is 10% to 50%, Graphite Powder 99 is 0.4% to 1.5%, and electrolytic copper is 1% to 3.9%, and micro mist wax is 0.3% to 1.5%, easily cutting agent is 0.1% to 0.9%, and toughener is 0.1% to 0.9%.
Preferably, described water-atomized iron powder is 48%, and reduced iron powder is 50%, and Graphite Powder 99 is 0.4%, and electrolytic copper is 1%, and micro mist wax is 0.3%, and easily cutting agent is 0.2%, and toughener is 0.1%.
Preferably, described water-atomized iron powder is 88%, and reduced iron powder is 10%, and Graphite Powder 99 is 0.4%, and electrolytic copper is 1%, and micro mist wax is 0.3%, and easily cutting agent is 0.1%, and toughener is 0.2%.
Preferably, described water-atomized iron powder is 68%, and reduced iron powder is 23.3%, and Graphite Powder 99 is 1.5%, and electrolytic copper is 3.9%, and micro mist wax is 1.5%, and easily cutting agent is 0.9%, and toughener is 0.9%.
Preferably, described water-atomized iron powder is 61.3%, and reduced iron powder is 30%, and Graphite Powder 99 is 1.5%, and electrolytic copper is 3.9%, and micro mist wax is 1.5%, and easily cutting agent is 0.9%, and toughener is 0.9%.
The present invention also discloses a kind of technology of powder metallurgy prescription simultaneously, and its processing step comprises:
Mixing step: described iron-based powder is evenly mixed by described water-atomized iron powder, reduced iron powder, Graphite Powder 99, electrolytic copper, micro mist wax, easy cutting agent and toughener proportioning;
Pressing step: the described iron-based powder that will mix is put into press, is finished by press described iron-based powder is sent into default product mold, and be pressed into the product blank;
Sintering step: the product blank is inserted the transmission guipure, transmit guipure and send into sintering oven according to the speed of setting, sinter described product blank into semi-finished articles;
Finishing step: described semi-finished articles is put into shaping mould carry out fine correction, make described semi-finished articles meet the requirements of tolerance zone;
Deburring step: orthopedic semi-finished articles through shot-peening deburring operation, is carried out deburring and handles;
Steam treatment step: with described semi-finished articles steam treatment after the deburring, make described semi-finished articles surface form tight zone.
Preferably, the time of described mixing step is 60 to 100 minutes, sieve through bipyramid batch mixing bucket batch mixing, 2 layer of 80 mesh sieve successively after the described iron-based powder proportioning and close batch after become powder formulation.
Preferably, the time of described sintering step is 2.5 to 5 hours, and it is 600 ℃ to 900 ℃ that described sintering step is used electrically heated preheating, preheating temperature earlier, and sintering temperature is 1120 ℃.
Compared with prior art, the present invention has adopted a kind of powder metallurgy prescription and technology, by water-atomized iron powder, reduced iron powder, Graphite Powder 99, electrolytic copper, micro mist wax, easily cutting agent and toughener evenly mix iron-based powder, and, in the above-mentioned iron-based powder, be measure unit by weight, water-atomized iron powder is 48% to 88%, reduced iron powder is 10% to 50%, and Graphite Powder 99 is 0.4% to 1.5%, and electrolytic copper is 1% to 3.9%, micro mist wax is 0.3% to 1.5%, easily cutting agent is 0.1% to 0.9%, and toughener is 0.1% to 0.9% proportioning mode, has improved tensile strength and the hardness of product.Simultaneously, by optimizing processing step, improve production efficiency, reduced the waste of the energy.
Listed prescription of the present invention and powder metallurgy prescription commonly used and the contrast of straight iron powder on tensile strength and hardness below, by the table in as can be seen, adopt powder metallurgy prescription of the present invention after, the tensile strength of product and hardness have obtained significant raising.
Embodiment
Below in conjunction with specific embodiments of the invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that obtains under the creative work prerequisite.
Embodiment:
Processing step of the present invention comprises:
Mixing step: described iron-based powder is evenly mixed by described water-atomized iron powder, reduced iron powder, Graphite Powder 99, electrolytic copper, micro mist wax, easy cutting agent and toughener proportioning, with sieve through bipyramid batch mixing bucket batch mixing, 2 layer of 80 mesh sieve successively after the iron-based powder proportioning and close batch after become powder formulation, the time of whole mixing step is 100 minutes.
Pressing step: the iron-based powder that mixes is sent into press top, and by suppressing automatically in the die cavity that adds powder box adding mould, 7 of the speed per minutes of compacting are delivered in the rotating disk with mechanical manipulator then.
Sintering step: net strip sintering furnace sintering; enter with the conveying of stainless steel guipure from opening for feed; needing the time by discharge hole for discharge is 3 hours; it is 650 ℃ with the electrically heated preheating temperature; sintering temperature is 1120 ℃; make protection gas with H2 and N2 in the burner hearth; its purpose is the oxygen in the H2 reduced iron base product; N2 makes protection gas usefulness, and N2 makes product not oxidized, and the making of H2 is raw material with liquefied ammonia; heat 800 ℃ under the effect of nickel accelerant; be decomposed into 75% hydrogen and 25% nitrogen, the making of nitrogen is to be raw material with pressurized air, adsorbs by carbonaceous molecular sieve; air separation is become nitrogen and oxygen; oxygen is discharged to outdoor automatically, and nitrogen is through purifying, as shielding gas.The powder metallurgy product obtain the material of certain intensity through oversintering, and hydrogen burns at two of stove.
Finishing step: distortion is to a certain degree arranged behind the demanding product sintering, need to guarantee form and position tolerance by shaping that shaping device is the oil press of 200 tons or 100 tons, and sizing die frame is arranged on the press, product is put into sizing die and is proofreaied and correct, thereby makes product reach the requirement tolerance zone.
The deburring step: comprise shot-peening, vibration, artificial deburring, the shot-peening deburring is exactly product to be poured in the sandblast machine spray to product with stainless shot with certain jet velocity, and product burr on string rubber rolls product sprays.Vibrator deburring is poured the product of some amount and a certain proportion of abrasive material jointly in the vibration trough and to be vibrated, and through taking out product and abrasive material after 30 minutes separately, artificial deburring is exactly with drilling machine the burr on the product aperture limit to be removed.
The steam treatment step: product is put into the iron basket, hang in the steam treatment stove, be heated to 530～580 ℃ with resistance wire, be incubated 7 hours, feed oversaturated water vapor, iron and water vapor react, and generate Z 250 and hydrogen, and the product surface densification after the steam treatment is difficult for getting rusty, can't leak gas, water vapor has special water vapor producer supply, adds the water insulation of cutting off the electricity supply automatically behind the certain pressure automatically, and is simple to operate.
In above-mentioned, can also adopt following preferred embodiment about powder metallurgy prescription of the present invention:
Embodiment 1: power formulations of the present invention is as follows: in iron-based powder, be measure unit by weight, water-atomized iron powder is 48%, reduced iron powder is 50%, and Graphite Powder 99 is 0.4%, and electrolytic copper is 1%, micro mist wax is 0.3%, and easily cutting agent is 0.2%, and toughener is 0.1%.
Embodiment 2: power formulations of the present invention is as follows: in iron-based powder, be measure unit by weight, water-atomized iron powder is 88%, reduced iron powder is 10%, and Graphite Powder 99 is 0.4%, and electrolytic copper is 1%, micro mist wax is 0.3%, and easily cutting agent is 0.1%, and toughener is 0.2%.
Embodiment 3: power formulations of the present invention is as follows: in iron-based powder, be measure unit by weight, water-atomized iron powder is 68%, reduced iron powder is 23.3%, and Graphite Powder 99 is 1.5%, and electrolytic copper is 3.9%, micro mist wax is 1.5%, and easily cutting agent is 0.9%, and toughener is 0.9%.
Embodiment 4: power formulations of the present invention is as follows: in iron-based powder, be measure unit by weight, water-atomized iron powder is 61.3%, reduced iron powder is 30%, and Graphite Powder 99 is 1.5%, and electrolytic copper is 3.9%, micro mist wax is 1.5%, and easily cutting agent is 0.9%, and toughener is 0.9%.
The above only is preferred embodiment of the present invention, and is in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of doing, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. powder metallurgy prescription, it is characterized in that: evenly mix iron-based powder by water-atomized iron powder, reduced iron powder, Graphite Powder 99, electrolytic copper, micro mist wax, easy cutting agent and toughener, in the described iron-based powder, be measure unit by weight, described water-atomized iron powder is 48% to 88%, reduced iron powder is 10% to 50%, Graphite Powder 99 is 0.4% to 1.5%, and electrolytic copper is 1% to 3.9%, and micro mist wax is 0.3% to 1.5%, easily cutting agent is 0.1% to 0.9%, and toughener is 0.1% to 0.9%.
2. a kind of powder metallurgy prescription according to claim 1, it is characterized in that: described water-atomized iron powder is 48%, and reduced iron powder is 50%, and Graphite Powder 99 is 0.4%, and electrolytic copper is 1%, and micro mist wax is 0.3%, and easily cutting agent is 0.2%, and toughener is 0.1%.
3. a kind of powder metallurgy prescription according to claim 1, it is characterized in that: described water-atomized iron powder is 88%, and reduced iron powder is 10%, and Graphite Powder 99 is 0.4%, and electrolytic copper is 1%, and micro mist wax is 0.3%, and easily cutting agent is 0.1%, and toughener is 0.2%.
4. a kind of powder metallurgy prescription according to claim 1, it is characterized in that: described water-atomized iron powder is 68%, and reduced iron powder is 23.3%, and Graphite Powder 99 is 1.5%, and electrolytic copper is 3.9%, and micro mist wax is 1.5%, and easily cutting agent is 0.9%, and toughener is 0.9%.
5. a kind of powder metallurgy prescription according to claim 1, it is characterized in that: described water-atomized iron powder is 61.3%, and reduced iron powder is 30%, and Graphite Powder 99 is 1.5%, and electrolytic copper is 3.9%, and micro mist wax is 1.5%, and easily cutting agent is 0.9%, and toughener is 0.9%.
6. technology based on each described powder metallurgy prescription of claim 1 to 5, its processing step comprises:
Mixing step: described iron-based powder is evenly mixed by described water-atomized iron powder, reduced iron powder, Graphite Powder 99, electrolytic copper, micro mist wax, easy cutting agent and toughener proportioning;
Pressing step: the described iron-based powder that will mix is put into press, is finished by press described iron-based powder is sent into default product mold, and be pressed into the product blank;
Sintering step: the product blank is inserted the transmission guipure, transmit guipure and send into sintering oven according to the speed of setting, sinter described product blank into semi-finished articles;
Finishing step: described semi-finished articles is put into shaping mould carry out fine correction, make described semi-finished articles meet the requirements of tolerance zone;
Deburring step: orthopedic semi-finished articles through shot-peening deburring operation, is carried out deburring and handles;
Steam treatment step: with described semi-finished articles steam treatment after the deburring, make described semi-finished articles surface form tight zone.
7. the technology of powder metallurgy prescription according to claim 6, it is characterized in that: the time of described mixing step is 60 to 100 minutes, sieve through bipyramid batch mixing bucket batch mixing, 2 layer of 80 mesh sieve successively after the described iron-based powder proportioning and close batch after become powder formulation.
8. the technology of powder metallurgy prescription according to claim 7, it is characterized in that: the time of described sintering step is 2.5 to 5 hours, and it is 600 ℃ to 900 ℃ that described sintering step is used electrically heated preheating, preheating temperature earlier, and sintering temperature is 1120 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310208088.1A CN103266271B (en) | 2013-05-29 | 2013-05-29 | A kind of powder metallurgy prescription and technique |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310208088.1A CN103266271B (en) | 2013-05-29 | 2013-05-29 | A kind of powder metallurgy prescription and technique |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103266271A true CN103266271A (en) | 2013-08-28 |
| CN103266271B CN103266271B (en) | 2016-04-20 |
Family
ID=49009932
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310208088.1A Active CN103266271B (en) | 2013-05-29 | 2013-05-29 | A kind of powder metallurgy prescription and technique |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103266271B (en) |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106086589A (en) * | 2016-03-25 | 2016-11-09 | 安徽恒均粉末冶金科技股份有限公司 | The erosion-resisting powder metallurgy of Cutting free is without magnetic balance block and preparation technology thereof |
| CN107552776A (en) * | 2017-08-24 | 2018-01-09 | 南通冠达粉末冶金有限公司 | A kind of powder metallurgy prescription |
| CN107671296A (en) * | 2017-08-24 | 2018-02-09 | 南通冠达粉末冶金有限公司 | A kind of planetary gear powder metallurgy forming method |
| CN107695336A (en) * | 2017-08-24 | 2018-02-16 | 南通冠达粉末冶金有限公司 | A kind of powder metallurgy forming method |
| CN107695335A (en) * | 2017-08-24 | 2018-02-16 | 南通冠达粉末冶金有限公司 | A kind of powder metallurgy prescription and its metallurgical forming method |
| CN108273991A (en) * | 2018-03-15 | 2018-07-13 | 中机锻压江苏股份有限公司 | A kind of bearing block metallurgical powder |
| CN108453251A (en) * | 2018-03-15 | 2018-08-28 | 江苏中威重工机械有限公司 | A kind of motor housing metallurgical powder |
| WO2019047032A1 (en) * | 2017-09-05 | 2019-03-14 | 戴文凤 | Belt pulley powder metallurgy formula |
| CN109604610A (en) * | 2018-11-20 | 2019-04-12 | 广州市光铭金属制品有限责任公司 | A kind of moulding process of fine module gear reduced iron powder |
| CN109967746A (en) * | 2019-04-06 | 2019-07-05 | 苏州中鼎冶金有限公司 | A kind of manufacturing method and powder metallurgical gear of powder metallurgical gear |
| CN112453387A (en) * | 2020-11-27 | 2021-03-09 | 深圳市日东科技发展有限公司 | Powder metallurgy-based high-density stainless steel product formula and process thereof |
| CN112792337A (en) * | 2020-12-29 | 2021-05-14 | 广东东睦新材料有限公司 | Production process of micro compressor cylinder body |
| CN113333740A (en) * | 2021-06-17 | 2021-09-03 | 德钜（厦门）特种合金制品有限公司 | Powder metallurgy formula and preparation method of high-power commercial vehicle water pump hub |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101708549A (en) * | 2009-11-27 | 2010-05-19 | 安徽省芜湖市信达粉末冶金零部件有限公司 | Powder metallurgy technical formula and technical process thereof |
| CN102921942A (en) * | 2012-10-17 | 2013-02-13 | 宁波拓发汽车零部件有限公司 | Guider of damper and preparation method of guider |
-
2013
- 2013-05-29 CN CN201310208088.1A patent/CN103266271B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101708549A (en) * | 2009-11-27 | 2010-05-19 | 安徽省芜湖市信达粉末冶金零部件有限公司 | Powder metallurgy technical formula and technical process thereof |
| CN102921942A (en) * | 2012-10-17 | 2013-02-13 | 宁波拓发汽车零部件有限公司 | Guider of damper and preparation method of guider |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106086589A (en) * | 2016-03-25 | 2016-11-09 | 安徽恒均粉末冶金科技股份有限公司 | The erosion-resisting powder metallurgy of Cutting free is without magnetic balance block and preparation technology thereof |
| CN107552776A (en) * | 2017-08-24 | 2018-01-09 | 南通冠达粉末冶金有限公司 | A kind of powder metallurgy prescription |
| CN107671296A (en) * | 2017-08-24 | 2018-02-09 | 南通冠达粉末冶金有限公司 | A kind of planetary gear powder metallurgy forming method |
| CN107695336A (en) * | 2017-08-24 | 2018-02-16 | 南通冠达粉末冶金有限公司 | A kind of powder metallurgy forming method |
| CN107695335A (en) * | 2017-08-24 | 2018-02-16 | 南通冠达粉末冶金有限公司 | A kind of powder metallurgy prescription and its metallurgical forming method |
| WO2019047032A1 (en) * | 2017-09-05 | 2019-03-14 | 戴文凤 | Belt pulley powder metallurgy formula |
| CN108453251A (en) * | 2018-03-15 | 2018-08-28 | 江苏中威重工机械有限公司 | A kind of motor housing metallurgical powder |
| CN108273991A (en) * | 2018-03-15 | 2018-07-13 | 中机锻压江苏股份有限公司 | A kind of bearing block metallurgical powder |
| CN109604610A (en) * | 2018-11-20 | 2019-04-12 | 广州市光铭金属制品有限责任公司 | A kind of moulding process of fine module gear reduced iron powder |
| CN109967746A (en) * | 2019-04-06 | 2019-07-05 | 苏州中鼎冶金有限公司 | A kind of manufacturing method and powder metallurgical gear of powder metallurgical gear |
| CN112453387A (en) * | 2020-11-27 | 2021-03-09 | 深圳市日东科技发展有限公司 | Powder metallurgy-based high-density stainless steel product formula and process thereof |
| CN112792337A (en) * | 2020-12-29 | 2021-05-14 | 广东东睦新材料有限公司 | Production process of micro compressor cylinder body |
| CN113333740A (en) * | 2021-06-17 | 2021-09-03 | 德钜（厦门）特种合金制品有限公司 | Powder metallurgy formula and preparation method of high-power commercial vehicle water pump hub |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103266271B (en) | 2016-04-20 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103266271B (en) | A kind of powder metallurgy prescription and technique | |
| CN102233425A (en) | Powder metallurgy formula and process | |
| CN101249562A (en) | Powder metallurgy prescription and technique | |
| CN101249564B (en) | Powder metallurgy technique | |
| CN104070160B (en) | A kind of powder metallurgy duplicate gear and preparation method thereof | |
| CN104028765B (en) | A kind of production method of the metallic sintered products with installation through hole | |
| CN102560249A (en) | Formula and process for powder metallurgy | |
| CN103223484A (en) | Powder metallurgy special-shaped gear and preparation method thereof | |
| CN103981436A (en) | Metal powder injection molded high-strength martensite aged steel and preparation method thereof | |
| CN102554216A (en) | Water atomization ferrum-copper alloy powder and manufacturing method | |
| CN102672183A (en) | Method for producing bevel gear with ratchet on end face through powder metallurgy warm forming | |
| CN103231050A (en) | Powder metallurgy horizontal gear and preparation method thereof | |
| CN101524757A (en) | Method for producing fly hammer seat by powder metallurgy | |
| CN102838108A (en) | Minor-structure high-density graphite product and preparation method thereof | |
| CN101524756A (en) | Powder metallurgy production method of alligatoring rings of automobile gearbox | |
| CN103231060A (en) | Powder metallurgy helical gear and preparation method thereof | |
| CN102672160A (en) | Preparation method of prealloying matrix powder | |
| CN103752837A (en) | Method for producing water atomized alloy powder by using reduced iron of smelting slag | |
| CN106180698A (en) | A kind of powder metallurgical production technique method | |
| CN103231052A (en) | Powder metallurgy sun gear and preparation method thereof | |
| CN103231062A (en) | Powder metallurgy planetary gear and preparation method thereof | |
| CN103495936A (en) | Formula of diamond-impregnated wheel | |
| CN108977719B (en) | A kind of preparation method of low-carbon alloy steel | |
| CN107043885A (en) | A kind of manufacture method of immediate action valve valve element | |
| CN103223485A (en) | Powder metallurgy bevel gear and preparation method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| ASS | Succession or assignment of patent right |
Owner name: GUANGDONG NBTM NEW MATERIALS CO., LTD. Free format text: FORMER OWNER: NBTM (JIANGMEN) POWDER METALLURGY CO., LTD. Effective date: 20150618 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20150618 Address after: The three road Pengjiang District Guangdong 529000 Jiangmen province Duruan Mian No. 8 wells Applicant after: Guangdong Dong Mu new material Co., Ltd Address before: 529050, Hongda Road 9, Pengjiang District, Guangdong, Jiangmen Applicant before: NBTM (JiangMen) Powder Metallurgy Co., Ltd. |
|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20211130 Address after: 044100 No. 9, churen Road, chuhou Park, Linyi County, Yuncheng City, Shanxi Province Patentee after: Shanxi Xinsheng New Material Co.,Ltd. Address before: 529000 No. 8, jingmiansan Road, Duruan Town, Pengjiang district, Jiangmen City, Guangdong Province Patentee before: GUANGDONG NBTM NEW MATERIALS CO.,LTD. |