CN1718771A - Prehardening treatment method of NAK80 mould steel - Google Patents
Prehardening treatment method of NAK80 mould steel Download PDFInfo
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- CN1718771A CN1718771A CN 200510027393 CN200510027393A CN1718771A CN 1718771 A CN1718771 A CN 1718771A CN 200510027393 CN200510027393 CN 200510027393 CN 200510027393 A CN200510027393 A CN 200510027393A CN 1718771 A CN1718771 A CN 1718771A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 116
- 239000010959 steel Substances 0.000 title claims abstract description 116
- 238000000034 method Methods 0.000 title claims abstract description 36
- 238000005496 tempering Methods 0.000 claims abstract description 29
- 238000005242 forging Methods 0.000 claims abstract description 27
- 238000010791 quenching Methods 0.000 claims abstract description 18
- 230000000171 quenching effect Effects 0.000 claims abstract description 18
- 239000007788 liquid Substances 0.000 claims abstract description 8
- 238000001816 cooling Methods 0.000 claims abstract description 6
- 229920003023 plastic Polymers 0.000 claims description 35
- 239000004033 plastic Substances 0.000 claims description 35
- 238000004519 manufacturing process Methods 0.000 claims description 21
- 238000001556 precipitation Methods 0.000 claims description 13
- 238000000465 moulding Methods 0.000 claims description 8
- 238000002791 soaking Methods 0.000 claims description 5
- 230000008901 benefit Effects 0.000 abstract description 5
- 238000010438 heat treatment Methods 0.000 abstract description 3
- 238000000137 annealing Methods 0.000 description 6
- 229910001566 austenite Inorganic materials 0.000 description 5
- 229910001563 bainite Inorganic materials 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- 239000007787 solid Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000009413 insulation Methods 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000008520 organization Effects 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 238000007669 thermal treatment Methods 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 229910000967 As alloy Inorganic materials 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000005864 Sulphur Substances 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000004512 die casting Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000009851 ferrous metallurgy Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000011031 large-scale manufacturing process Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000011572 manganese Substances 0.000 description 1
- 229910000734 martensite Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 235000019362 perlite Nutrition 0.000 description 1
- 239000010451 perlite Substances 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 230000035882 stress Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
- 230000001550 time effect Effects 0.000 description 1
Abstract
A method for prehardening the die steel NAK80 includes such steps as thermal forging with 860-920 deg.C for final temp and 15-20% for final deformation, quenching by directly putting the forged die steel at 900 deg.C in conventional quenching liquid to cool its temp to 200 deg.C, and tempering steps including heating it to 490-560 deg.C at the speed of 80-100 deg.C/h in the tempering furnace, holding the temp for 2-6 hr, and cooling in air. Its advantages are low cost and short period.
Description
Technical field
The present invention relates to the Prehardening treatment method of ferrous metallurgy industry plastic die steel, refer in particular to the Prehardening treatment method of precipitation strength plastic die steel.
Background technology
Die steel is special steel alloy, divides by purposes, generally can be divided into hot-work die steel, cold-work die steel and plastic die steel.Plastic die steel is that (mould of plastics is the important process equipment of current plastics forming industry to the starting material that are used for the mould of plastics manufacturing, and plastics be unable to do without mould of plastics, and the manufacturing of mould of plastics at first needs plastic die steel.In the world current, human lives and industrial development more and more depend on this novel industry of plastics, and being accompanied by mould of plastics manufacturing output increases year by year, and the consumption of plastic die steel also increases year by year.)。Chief component as alloy die steel---plastic die steel generally can be divided into build up plastic die steel (the build up plastic die steel is to rely on martensite and bainite structure to obtain to strengthen) and precipitation strength plastic die steel (the precipitation strength plastic die steel is to rely on metallographic phase to separate out to obtain to strengthen).In order to guarantee that plastic die steel (comprising build up plastic die steel and precipitation strength plastic die steel) possesses good processing properties when the processing and manufacturing mould of plastics, mirror polish performance and dimensional stability, the Hardness Control that metallurgical production enterprise (steelmaker) should deliver goods dispatching from the factory of plastic die steel when making plastic die steel is in the scope of narrower (necessarily), satisfying the performance that Mould Machining was possessed of die steel user (die casting producer), this metallurgical production enterprise adopts a kind of thermal treatment process that the method for delivery Hardness Control in narrower (necessarily) scope of plastic die steel is referred to as Prehardening treatment method.
The NAK80 steel that belongs to the precipitation strength plastic die steel, the delivery Hardness Control that its pre-hardening is handled is: HRC38～HRC43 scope.At present, the NAK80 precipitation strength plastic die steel that smelter is produced, the pre-hardening processing technological flow is: steel forging → annealing → heating → soaking (860 ℃～920 ℃) → quenching → high tempering (670 ℃～690 ℃) → average tempering (500 ℃～540 ℃) → be cooled to room temperature.This traditional concrete treatment process of pre-hardening is: the plastic die steel steel after at first heat forged being shaped put into carry out in the annealing furnace 20～26 hours softening annealings of 660～700 ℃ of insulations handle (this annealing be forge module after forging must through an operation, its objective is to make that the thermal stresses of the steel behind the forging and molding is discharged fully, avoid pre-hardening to add the stress of pining for owing to module and cause cracking) in the back; Plastic die steel steel after will softening are subsequently inserted in the quenching furnance, with the heat-up rate of 80～100 ℃/h steel being heated to 860～920 ℃ of insulations (made the microstructure of steel become austenite structure in 6～10 hours, have only and make the microstructure of steel become austenite structure, the steel of back operation could make alloying element in the steel fully dissolve and enter in the austenite structure, for can obtain uniform pearlitic structure and the metal precipitated phase creates conditions.); Put into then and be cooled to room temperature (obtaining solid solution structure) in the hardening liquid; Again cooled steel are put into tempering stove, with the heat-up rate of 80～100 ℃/h steel being heated to 670～690 ℃ of insulations (made the microstructure of steel be decomposed into the perlite balanced weave in 8～12 hours, pearlitic structure is the most stable steel microstructure, for organization foundation is laid in the thermal treatment of back operation.); The steel stove is chilled to 500～540 ℃ and be incubated 8～12 hours (making steel can carry out sufficient precipitation strength) subsequently; Come out of the stove the cooling after obtain prevulcanized effect: prevulcanized hardness is in HRC38～HRC43 scope.The advantage of this traditional technology is: the delivery hardness of steel stably is controlled in the HRC38～HRC43 scope of standard-required; Weak point is: the pre-hardening treatment time is long; the time of finishing pre-hardening processing needs 48～60 hours; cause the production efficiency of metallurgical production enterprise (steelmaker) low, metallurgical manufacturing cost is high, has restricted the large-scale production of NAK80 die steel and applies.
Summary of the invention
The present invention develops a kind of Prehardening treatment method of NAK80 die steel, at first, it utilizes the whole satin temperature and the deflection control of precipitation strength plastic die steel NAK80 steel, make steel form uniform austenite structure, omitted " annealing → heating → soaking (860 ℃～920 ℃) " operation of traditional Prehardening treatment method; Secondly, by the time control that the cooling system of quenching process is finely tuned and strengthening phase is separated out temperature, " quenching → high tempering (670 ℃～690 ℃) → average tempering (500 ℃～540 ℃) " operation of traditional Prehardening treatment method is reduced to " quenching → tempering (490 ℃～560 ℃) " operation, reaches the pre-hardening purpose of NAK80 die steel; Make traditional loaded down with trivial details pre-hardening processing technological flow become simple to operation, the throughput of pre-hardening treatment facility (metallurgical annealing furnace, furnace apparatus etc.) is liberated greatly.The present invention has short, characteristic of low energy consumption of NAK80 die steel pre-hardening treatment time, solved NAK80 die steel pre-hardening treatment time long problem, improved production efficiency, greatly reduce the metallurgical production cost of making, satisfied the demand of die steel market to precipitation strength plastic die steel steel.
The Prehardening treatment method of the NAK80 die steel of the present invention's exploitation is characterized in that adopting " hot-work forging molding → quenching → tempering " three-steps process flow process, the NAK80 precipitation strength plastic die steel finished product of production durometer level HRC38～HRC43:
The first, hot-work forging molding operation: adopt forging press to NAK80 die steel hot-work forging deformation, produce the finished product die steel steel of size conforms specification standards; Technical essential is: when (1) hot-work is forged, the steel final forging temperature is controlled in 860～920 ℃ the interval range, hot-work forging deformation amount in 860～920 ℃ of temperature ranges is controlled at 15～20% (can be so that steel obtain uniform austenite structure after finishing forging, for ensuing solution treatment creates conditions, in the forging process in the final forging temperature scope, obtain the microstructure that the certain deformation amount can the refinement steel, reach the purpose of steel over-all properties preferably); (2) other, processing requirement is carried out routinely;
Second, quenching process: the finished product die steel steel of size conforms specification standards are directly put into conventional quenching liquid carry out solution treatment, in hardening liquid, be cooled to 150～250 ℃ and (obtain bainite structure, because bainite structure has the higher microhardness and the tissue of refinement, for obtaining the microstructure of refinement after the tempering and the raising of over-all properties lays the first stone.)；
The 3rd, tempering process: the die steel steel of 150～250 ℃ of temperature are inserted in the tempering stove, heat-up rate with 80～100 ℃/h is heated to 490～560 ℃ with steel, (soaking time is decided according to the hardness HRC numerical value of customer requirements to be incubated 2～6 hours, see Table 1) after, with steel shift out the tempering stove air cooling to room temperature (metallographic phase in the steel tissue separate out the reinforcement that reaches matrix, thereby make steel obtain needed hardness, owing in these 490 ℃～560 ℃ tempering ranges, carry out temper, the former bainite structure of material changes along with the prolongation of tempering time, this variation is a kind of decomposition of bainite structure, in addition, the precipitation strength effect of alloyed metal phase is also along with the variation of the tempering time strengthening effect to steel produces because of influence, final formation time effect works to the delivery hardness of steel, and this obtains embodying in table 1 too.Steel hardness after the processing has reached prevulcanized purpose in the scope of HRC38～HRC43.)。
Compare with prior art, the present invention has following advantage:
1, pre-hardening treatment process advantages of simple, convenient, the easy grasp of whole operational process of craft, workable, technology stability is high;
2, the pre-hardening treatment facility requires simply, and existing treatment technology must have quenching furnance just can carry out pre-hardening and handle, and the technology of the present invention need not to increase quenching furnance and just can finish whole pre-hardening processing;
3, reach the purpose of control pre-hardening HRC hardness by adjusting, satisfy the demand that different user requires different steel pre-hardening hardness the time in the steel drawing process;
4, time (production cycle) weak point of the whole pre-hardening processing of steel, traditional pre-hardening treatment process time, pre-hardening treatment process of the present invention only needed 10～15 hours at 48～60 hours;
5, productivity height, metallurgical manufacturing cost reduces greatly.
Specific embodiments
Certain Iron And Steel Company implements patent of the present invention, (weight percent of the chemical composition content of this die steel is: carbon 0.10～0.18% to precipitation strength plastic die steel NAK80 steel, manganese 1.70～2.00%, nickel 2.90～3.40%, molybdenum 0.20～0.50%, aluminium 0.70～1.10%, copper 0.80～1.20%, silicon≤0.45%, phosphorus≤0.025%, sulphur≤0.020%) pre-hardening of carrying out factory is handled, it is characterized in that adopting " hot-work forging molding → quenching → tempering " three-steps process flow process, the NAK80 die steel finished product of production durometer level HRC38～HRC43: first, hot-work forging molding operation, adopt forging press to NAK80 die steel hot-work forging deformation, produce finished product die steel steel (the finished product cross-sectional dimension 200 * 795mm of size conforms specification standards, 250 * 795mm, 300 * 795mm, 350 * 795mm), technical essential is: when (1) hot-work is forged, the steel final forging temperature is controlled in 860～920 ℃ the interval range, and the hot-work forging deformation amounts in 860～920 ℃ of temperature ranges are controlled at 15～20%; (2) other, processing requirement is carried out routinely; The second, quenching process is directly put into conventional quenching liquid with the finished product die steel steel of size conforms specification standards and is carried out solution treatment, is cooled to 150～250 ℃ in hardening liquid; The 3rd, tempering process is inserted the die steel steel of 150～250 ℃ of temperature in the tempering stove, with the heat-up rate of 80～100 ℃/h steel is heated to 490～560 ℃, is incubated after 2～6 hours, and steel shift out the tempering stove air cooling to room temperature.Steel after the processing detect through hardness and show: this steel pre-hardening hardness (subordinate list 1) in the scope of HRC38～HRC43, satisfied the hardness requirement that the pre-hardening steel dispatch from the factory, qualification rate 100%.
Implement patent pre-hardening of the present invention and handle NAK80 die steel, it is simple to have treatment process, organization of production is convenient, the characteristics of metallurgical low cost of manufacture, can be by the time control of 490～560 ℃ of tempering process, regulate the HRC numerical stability (different hardness according to the user requires) in the scope of HRC38～HRC43 of die steel steel hardness, product percent of pass 100%, it is long to efficiently solve the NAK80 die steel pre-hardening treatment time, the problem that production efficiency is low, the whole pre-hardening treatment time only needs 10～15 hours, treatment time shortens 70%, the production efficiency height, metallurgical low cost of manufacture, ton steel pre-hardening processing cost is reduced to 700～900 yuan from 2000～2500 yuan of Renminbi, satisfy customer requirements and market demand, remarkable in economical benefits.
NAK80 die steel solid solubility temperature, tempering time-hardness correspondence table
Table 1
| The corresponding relation of different solid solubility temperatures, time and pre-hardening hardness | ||||
| Solid solubility temperature | Tempering time t and hardness HRC respective value | |||
| 2h | 3h | 4h | 6h | |
| 860 ℃ | 36HRC | 42.3HRC | 43HRC | 43.3HRC |
| 890 ℃ | 38HRC | 42.3HRC | 43.7HRC | 42.7HRC |
| 920 ℃ | 39HRC | 42.3HRC | 42HRC | 43.7HRC |
| Annotate: (1) solid solubility temperature is the final forging temperature of hot-work forging molding operation; (2) tempering time is the soaking time of 490～560 ℃ of tempering process. | ||||
Claims (1)
1, the Prehardening treatment method of NAK80 die steel is characterized in that adopting " hot-work forging molding → quenching → tempering " three-steps process flow process, the NAK80 precipitation strength plastic die steel finished product of production durometer level HRC38～HRC43:
The first, hot-work forging molding operation: adopt forging press to NAK80 die steel hot-work forging deformation, produce the finished product die steel steel of size conforms specification standards; Technical essential is: when (1) hot-work was forged, the steel final forging temperature was controlled in 860～920 ℃ the interval range, and the hot-work forging deformation amounts in 860～920 ℃ of temperature ranges are controlled at 15～20%; (2) other, processing requirement is carried out routinely;
The second, quenching process: the finished product die steel steel of size conforms specification standards are directly put into conventional quenching liquid carry out solution treatment, in hardening liquid, be cooled to 150～250 ℃;
The 3rd, tempering process: the die steel steel of 150～250 ℃ of temperature are inserted in the tempering stove, heat-up rate with 80～100 ℃/h is heated to 490～560 ℃ with steel, be incubated 2～6 hours, soaking time is decided according to the hardness HRC numerical value of customer requirements, then, steel are shifted out the tempering stove air cooling to room temperature.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100273936A CN100345982C (en) | 2005-06-30 | 2005-06-30 | Prehardening treatment method of NAK80 mould steel |
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| CNB2005100273936A CN100345982C (en) | 2005-06-30 | 2005-06-30 | Prehardening treatment method of NAK80 mould steel |
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| CN1718771A true CN1718771A (en) | 2006-01-11 |
| CN100345982C CN100345982C (en) | 2007-10-31 |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101864514A (en) * | 2010-06-28 | 2010-10-20 | 长春轨道客车装备有限责任公司 | EA1T steel axle heat treatment method |
| CN101906520A (en) * | 2009-06-02 | 2010-12-08 | 上海重型机器厂有限公司 | Heat-treatment technology method for lower end socket forge piece of nuclear power reactor pressure vessel |
| CN102021294A (en) * | 2010-12-16 | 2011-04-20 | 山西太钢不锈钢股份有限公司 | Thermal processing method of NAK80 steel plates |
| CN103386452A (en) * | 2013-08-11 | 2013-11-13 | 山西太钢不锈钢股份有限公司 | TWZ series stainless steel warm forging method |
| CN103773936A (en) * | 2012-10-23 | 2014-05-07 | 日立金属株式会社 | Method for quenching die |
| CN108441613A (en) * | 2018-04-10 | 2018-08-24 | 抚顺特殊钢股份有限公司 | A kind of anti-white point control method of age-hardening plastic mould steel |
| EP3392354A1 (en) * | 2017-04-19 | 2018-10-24 | Daido Steel Co.,Ltd. | Prehardened steel material, mold, and mold component |
| CN109402505A (en) * | 2018-10-26 | 2019-03-01 | 朱经辉 | A kind of high mirror surface acid-proof plastic mould Steel material of pre- stiffened and preparation method thereof |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01279709A (en) * | 1988-05-06 | 1989-11-10 | Kobe Steel Ltd | Production of pre-hardened steel for plastic die by directly quenching |
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| CN101906520A (en) * | 2009-06-02 | 2010-12-08 | 上海重型机器厂有限公司 | Heat-treatment technology method for lower end socket forge piece of nuclear power reactor pressure vessel |
| CN101906520B (en) * | 2009-06-02 | 2012-12-12 | 上海重型机器厂有限公司 | Heat-treatment technology method for lower end socket forge piece of nuclear power reactor pressure vessel |
| CN101864514A (en) * | 2010-06-28 | 2010-10-20 | 长春轨道客车装备有限责任公司 | EA1T steel axle heat treatment method |
| CN101864514B (en) * | 2010-06-28 | 2012-07-18 | 长春轨道客车装备有限责任公司 | EA1T steel axle heat treatment method |
| CN102021294A (en) * | 2010-12-16 | 2011-04-20 | 山西太钢不锈钢股份有限公司 | Thermal processing method of NAK80 steel plates |
| CN103773936A (en) * | 2012-10-23 | 2014-05-07 | 日立金属株式会社 | Method for quenching die |
| CN103773936B (en) * | 2012-10-23 | 2015-07-08 | 日立金属株式会社 | Method for quenching die |
| CN103386452A (en) * | 2013-08-11 | 2013-11-13 | 山西太钢不锈钢股份有限公司 | TWZ series stainless steel warm forging method |
| CN103386452B (en) * | 2013-08-11 | 2016-04-27 | 山西太钢不锈钢股份有限公司 | The method of a kind of TWZ series stainless steel warm forging |
| EP3392354A1 (en) * | 2017-04-19 | 2018-10-24 | Daido Steel Co.,Ltd. | Prehardened steel material, mold, and mold component |
| CN108728738A (en) * | 2017-04-19 | 2018-11-02 | 大同特殊钢株式会社 | Pre-hardening steel, mold and mold component |
| US11091825B2 (en) | 2017-04-19 | 2021-08-17 | Daido Steel Co., Ltd. | Prehardened steel material, mold, and mold component |
| CN108441613A (en) * | 2018-04-10 | 2018-08-24 | 抚顺特殊钢股份有限公司 | A kind of anti-white point control method of age-hardening plastic mould steel |
| CN108441613B (en) * | 2018-04-10 | 2019-09-13 | 抚顺特殊钢股份有限公司 | A kind of anti-white point control method of age-hardening plastic mould steel |
| CN109402505A (en) * | 2018-10-26 | 2019-03-01 | 朱经辉 | A kind of high mirror surface acid-proof plastic mould Steel material of pre- stiffened and preparation method thereof |
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| CN100345982C (en) | 2007-10-31 |
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Effective date of registration: 20131211 Address after: 200940 Baoshan District aquatic Road, Shanghai, No. 1269 Patentee after: BAOSTEEL SPECIALSTEEL CO., LTD. Address before: 201900 Fujin Road, Shanghai, orchard, Baoshan District Patentee before: Baoshan Iron & Steel Co., Ltd. |
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Effective date of registration: 20200514 Address after: 200940 room 1277, building 216, 1269 Shuishui Road, Baoshan District, Shanghai Patentee after: Baowu Special Metallurgy Co., Ltd Address before: 200940 No. 1269, Fisheries Road, Shanghai, Baoshan District Patentee before: BAOSTEEL SPECIAL STEEL Co.,Ltd. |
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Effective date of registration: 20200520 Address after: 200940 room 1277, building 216, 1269 Shuishui Road, Baoshan District, Shanghai Patentee after: Baowu Special Metallurgy Co., Ltd Address before: 200940 No. 1269, Fisheries Road, Shanghai, Baoshan District Patentee before: BAOSTEEL SPECIAL STEEL Co.,Ltd. |
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