CN116516119A - Process for rapidly producing large thick plate by hot working die steel - Google Patents
Process for rapidly producing large thick plate by hot working die steel Download PDFInfo
- Publication number
- CN116516119A CN116516119A CN202310610814.6A CN202310610814A CN116516119A CN 116516119 A CN116516119 A CN 116516119A CN 202310610814 A CN202310610814 A CN 202310610814A CN 116516119 A CN116516119 A CN 116516119A
- Authority
- CN
- China
- Prior art keywords
- quenching
- forging
- die steel
- electroslag
- minutes
- 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.)
- Pending
Links
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 31
- 239000010959 steel Substances 0.000 title claims abstract description 31
- 238000000034 method Methods 0.000 title claims abstract description 28
- 238000005242 forging Methods 0.000 claims abstract description 64
- 238000010791 quenching Methods 0.000 claims abstract description 53
- 230000000171 quenching effect Effects 0.000 claims abstract description 53
- 238000001816 cooling Methods 0.000 claims abstract description 33
- 238000010438 heat treatment Methods 0.000 claims abstract description 29
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 24
- 238000005096 rolling process Methods 0.000 claims abstract description 9
- 238000010304 firing Methods 0.000 claims abstract description 7
- 238000004519 manufacturing process Methods 0.000 abstract description 10
- 239000002184 metal Substances 0.000 abstract description 6
- 229910052751 metal Inorganic materials 0.000 abstract description 6
- 238000005265 energy consumption Methods 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 abstract 1
- 239000000463 material Substances 0.000 description 13
- 239000000047 product Substances 0.000 description 10
- 238000001514 detection method Methods 0.000 description 8
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 238000003303 reheating Methods 0.000 description 6
- 238000003754 machining Methods 0.000 description 4
- 229910001567 cementite Inorganic materials 0.000 description 3
- 238000009792 diffusion process Methods 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- KSOKAHYVTMZFBJ-UHFFFAOYSA-N iron;methane Chemical compound C.[Fe].[Fe].[Fe] KSOKAHYVTMZFBJ-UHFFFAOYSA-N 0.000 description 3
- 238000000137 annealing Methods 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000007730 finishing process Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 239000012466 permeate Substances 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 238000007639 printing Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0062—Heat-treating apparatus with a cooling or quenching zone
-
- 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
Abstract
A technology for rapidly producing a large thick plate by hot working die steel relates to the field of metal hot working, and comprises the following steps: firstly, vertically placing electroslag round ingots into a chamber type furnace by using a reclaimer, wherein the chamber type furnace adopts top firing for heating; secondly, upsetting the heated electroslag round ingot by a forging press, and flattening the upsetted electroslag round ingot on a flat anvil by an operator clamp to obtain an intermediate forging; thirdly, returning the intermediate forging piece to the furnace for heating, and drawing out the intermediate forging piece with large rolling reduction to obtain a final forging piece; fourthly, feeding the final forging into a quenching tank with a stirrer for quenching within 2 minutes, wherein the quenching comprises water cooling and air cooling, the water cooling time is 5-8 minutes, the air cooling time is 1-2 minutes, and the quenching is circulated for 6-10 times according to the sequence of water cooling and air cooling; and fifthly, carrying out final heat treatment on the final forging after quenching. The hot work die steel manufactured by the process has the advantages of excellent performances, simple process, high production efficiency, high metal yield, reduced energy consumption and greatly reduced production cost.
Description
Technical Field
The invention relates to the field of metal hot working, in particular to rapid production and process requirements of hot working die steel.
Background
The traditional hot die steel is heated by adopting a trolley furnace, forging and drawing are performed by firing, quenching is performed after reheating, and the traditional die steel generally adopts the following processes:
1. heating and taking materials
The traditional heating adopts the trolley furnace to heat, and trolley furnace sealing performance is poor to and trolley furnace horizontal charging need add the pad iron, and the pad iron needs the heat absorption, and the trolley is about to come out to get the material, these all can increase the gas consumption, and heating cost increases, and the uneven phenomenon of heating can appear in pad iron and material contact part. The trolley furnace heats the hot work die steel, the temperature difference between the inside and the outside is large, the temperature loss is large, the high-temperature diffusion time is long (generally 1270 ℃ for 30-35 hours), the material taking time by using clamps is long, generally about 5 minutes, and the heat loss is large.
2. Forging method of hot work die steel
The traditional hot working die steel process for producing thick plates mainly follows the following production process
The hot die steel thick plate block process comprises the following steps:
pressing jaw-chamfering- (rounding) -heating-upsetting-heating-drawing-eight-direction- (rounding) heating-upsetting-heating-drawing-finishing-correcting
The defects of the traditional hot work die steel forging are obvious, and the forging process adopts multiple heating, so that the burning loss is large, and the metal yield is low. Therefore, the cost is high, and the market competitiveness is reduced.
3. Quenching process
The traditional hot die steel quenching process mainly follows the following production process:
post-forging heating-quenching-final heat treatment
The defects of the traditional quenching method are obvious, and the reheating and quenching efficiency are increased, the quenching efficiency is low and the yield is reduced due to the fact that the reheating is needed and the quenching cycle times are large (the traditional quenching is generally carried out for 10-15 times).
Disclosure of Invention
The invention aims to solve the technical problems of high heat and burning loss of the thick plate of the hot work die steel, and solves the problems of high quenching cycle times.
The purpose of the invention is realized in the following way: a process for rapidly producing a large thick plate by hot working die steel comprises the following steps: firstly, vertically placing electroslag round ingots into a chamber type furnace by using a reclaimer, wherein the chamber type furnace adopts top firing for heating; secondly, upsetting the heated electroslag round ingot by a forging press, and flattening the upsetted electroslag round ingot on a flat anvil by an operator clamp to obtain an intermediate forging; thirdly, returning the intermediate forging piece to the furnace for heating, and drawing out the intermediate forging piece with large rolling reduction to obtain a final forging piece; fourthly, feeding the final forging into a quenching tank with a stirrer for quenching within 2 minutes, wherein the quenching comprises water cooling and air cooling, the water cooling time is 5-8 minutes, the air cooling time is 1-2 minutes, and the quenching is circulated for 6-10 times according to the sequence of water cooling and air cooling; and fifthly, carrying out final heat treatment on the final forging after quenching.
Preferably, the second upsetting is performed between the second step and the third step.
Preferably, the high reduction in the third step is 20% -25% of the height of the forging stock.
Preferably, the temperature equalization is performed between the fourth step and the fifth step, and the secondary quenching is performed after the temperature equalization.
Preferably, the forging press in the second step is a 5300-6300 ton forging press.
The beneficial effects of the invention are as follows:
1. the method for heating the vertical top combustion of the chamber furnace and taking materials by the material taking machine has the advantages that the chamber furnace has good sealing performance, the vertical furnace is filled, only the bottom and the bottom of the furnace are in contact, the peripheral space is large, natural gas and air convection is more favorable, the full combustion is easy, the space between the materials is large, the surface area of high-temperature radiation to steel is large, the temperature rise is fast, the temperature loss is small, and the high-temperature diffusion time is relatively short (generally 1270 ℃ for 20-25 hours). The reclaimer directly reclaims materials and directly sends the materials to the forging machine, and the heat loss is reduced from reclaiming to about 1 minute of the forging machine.
2. The hot working die steel rapid forging process has the advantages that the steps of forging a pressing jaw and chamfering are adopted for reducing the steel ingot for the electroslag round ingot, upsetting and drawing can be completed by only one fire by adopting an operator clamp, burning loss is reduced, the hot working die steel forging needs to crush a net-shaped cementome, generally needs to have large rolling reduction and repeated upsetting and drawing to meet the requirements, the rolling reduction of a 5300-6300 ton forging machine is large, the core deformation and penetration are complete, the firing deformation can be reduced by one fire, so that loss can be reduced, the risk of grain size increase or mixed crystal due to the fact that the heating times are increased is reduced, the longitudinal performance and the transverse performance of the die steel forging are smaller due to the fact that one fire is deformed transversely and longitudinally, and the mechanical performance is improved comprehensively.
3. The rapid quenching and double stirring process has the advantages of reducing the cycle times of reheating and quenching after forging, having better quenching hardenability, reducing burning loss and saving cost.
In summary, compared with the existing production process of the traditional forging die steel, the production process of the invention has the advantages of upsetting one fire, rapid quenching, less fire, simple production process, high production efficiency and low production cost.
Drawings
FIG. 1 is a plot of time versus temperature for a first step in a first embodiment of the invention.
FIG. 2 is a plot of time versus temperature for the fifth step in accordance with an embodiment of the present invention.
FIG. 3 is a plot of time versus temperature for the sixth step in the second embodiment of the present invention.
Fig. 4 is a schematic structural view of the chamber furnace of the present invention.
Fig. 5 is a schematic structural view of the quenching bath of the present invention.
Fig. 6 is a right side view of fig. 5.
Fig. 7 is a top view of fig. 5.
Detailed Description
Example 1
Further illustrating the process route for producing 460 x 850 slabs for producing H13 hot work die steel electroslag round ingots according to the invention by combining the examples is as follows:
electroslag round ingot, heating, upsetting, heating, drawing, finishing, quenching, double-circulation cooling, final heat treatment, straightening, flaw detection, machining, flaw detection, sawing and warehousing
In the first step, 12.5 tons of H13 electroslag round ingots are vertically placed into a chamber furnace for heating by a reclaimer, and the temperature rise speed is high by vertical top firing, and the high-temperature diffusion time is relatively short. The structure of the chamber furnace is shown in fig. 4, and comprises a furnace body 2, wherein burners 3 are arranged on the periphery of the top in the furnace body 2 to form top firing, and electroslag round ingots 1 are vertically arranged in the furnace body 2.
And secondly, processing the heated electroslag round ingot by adopting a 5300-6300 ton forging press, upsetting an upsetting plate to phi 1465mm, facilitating turning over of a clamp of an operating machine, and drawing to 1100 x 720mm on a flat anvil to obtain an intermediate forging. The net-shaped cementite is crushed in the steel material of the crushing die through upsetting deformation, and the deformation with large rolling reduction (about 250mm rolling reduction) is utilized to permeate into the metal, so as to crush grains.
And thirdly, returning to the furnace for reheating, and drawing the heated intermediate forging piece to 485 x 875mm by using a forging machine to obtain a final forging piece, wherein the final forging piece meets the size requirement of a forging finished product of die steel.
And fourthly, the final forging enters an online rapid quenching tank for quenching within 2 minutes, wherein the quenching tank is shown in fig. 5-7 and comprises a quenching tank body 4, a water pipe hole 5 and two air pressure pipes 6 are arranged on the quenching tank body 4, and two groups of stirring machines 7 are arranged in the quenching tank body 4.
The quenching comprises water cooling and air cooling, wherein the water cooling time is 7 minutes, the air cooling time is 1.5 minutes, and the quenching is circulated for 8 times according to the sequence of water cooling and air cooling. The short-time and multi-frequency water inlet mode can prevent the generation of stress cracks.
When quenching, the water temperature is not higher than 50 ℃, and when the water temperature is higher than 50 ℃, a stirrer and compressed air of the rapid quenching tank are started. After the 8 times of circulation are finished, temperature is measured after temperature is returned for 5 minutes, and if the temperature is higher than 350 ℃, water cooling is added for 1-2 times until the temperature is returned to be lower than 350 ℃ after the surface of the material is air-cooled for 5 minutes.
And fifthly, carrying out final heat treatment (spheroidizing annealing) on the quenched final forging to obtain a finished product.
Sixth, performing a finished product finishing process on the finished product: the process flow comprises the following steps: straightening, flaw detection, machining, flaw detection, sawing of finished products, printing of spray marks and warehousing.
Example two
The process route is as follows:
electroslag round ingot heating, primary upsetting drawing, heating, secondary upsetting drawing, heating, drawing, on-line quenching, soaking, secondary quenching, final heat treatment, straightening, flaw detection, black skin grinding (or machining), flaw detection, sawing and warehousing.
In the first step, 15 tons of H13 electroslag round ingots are vertically placed into a chamber furnace for heating by a reclaimer.
And secondly, upsetting and pulling once, namely processing the heated electroslag round ingot by adopting a 5300-6300 ton forging press, upsetting an upsetting plate to phi 1521mm, facilitating turning over of a clamp of an operating machine, and pulling the heated electroslag round ingot to phi 1020mm in a flat anvil to obtain the intermediate forging. The net-shaped cementite is crushed in the steel material of the crushing die through upsetting deformation, and the deformation with large rolling reduction (about 250mm rolling reduction) is utilized to permeate into the metal, so as to crush grains.
And thirdly, performing secondary upsetting, namely returning the intermediate forging subjected to primary upsetting to a furnace for heating, upsetting to phi 1477mm by using a 5300-6300 forging machine, and drawing to 1100 x 82mm, wherein cementite is continuously crushed by further upsetting and drawing, so that the machinery in the longitudinal and transverse directions is continuously enhanced and improved.
And fourthly, returning the intermediate forging subjected to the second upsetting to a furnace for reheating, and drawing the heated intermediate forging to 510 x 660 mm by using a forging machine to obtain a final forging, wherein the final forging meets the forging finished product size requirement of die steel.
And fifthly, putting the final forging into a quick quenching tank for online quenching within 2 minutes, wherein the online quenching comprises water cooling and air cooling, the water cooling time is 7 minutes, the air cooling time is 1.5 minutes, and the steps of water cooling and air cooling are sequentially circulated for 8 times. The short-time and multi-frequency water inlet mode can prevent the generation of stress cracks.
When in online quenching, the water temperature is not higher than 50 ℃, and when the water temperature is higher than 50 ℃, a stirrer and compressed air of the rapid quenching tank are started. After the 8 times of circulation are finished, temperature is measured after temperature is returned for 5 minutes, and if the temperature is higher than 350 ℃, water cooling is added for 1-2 times until the temperature is returned to be lower than 350 ℃ after the surface of the material is air-cooled for 5 minutes.
And sixthly, homogenizing the temperature of the final forging after on-line quenching.
And seventhly, carrying out secondary quenching on the final forging after temperature equalization, wherein the secondary quenching process is the same as the online quenching process in the fifth step.
And eighth, carrying out final heat treatment (spheroidizing annealing) on the quenched final forging to obtain a finished product.
Ninth, performing a finished product finishing process on the finished product: the process flow comprises the following steps: straightening, flaw detection, machining, flaw detection, sawing of finished products, printing of spray marks and warehousing.
Claims (5)
1. The process for rapidly producing the large thick plate by hot working die steel is characterized by comprising the following steps of:
firstly, vertically placing electroslag round ingots into a chamber type furnace by using a reclaimer, wherein the chamber type furnace adopts top firing for heating;
secondly, upsetting the heated electroslag round ingot by a forging press, and flattening the upsetted electroslag round ingot on a flat anvil by an operator clamp to obtain an intermediate forging;
thirdly, returning the intermediate forging piece to the furnace for heating, and drawing out the intermediate forging piece with large rolling reduction to obtain a final forging piece;
fourthly, feeding the final forging into a quenching tank with a stirrer for quenching within 2 minutes, wherein the quenching comprises water cooling and air cooling, the water cooling time is 5-8 minutes, the air cooling time is 1-2 minutes, and the quenching is circulated for 6-10 times according to the sequence of water cooling and air cooling;
and fifthly, carrying out final heat treatment on the final forging after quenching.
2. The process for rapidly producing large thick plates by hot work die steel according to claim 1, which is characterized in that: and (3) carrying out secondary upsetting and drawing between the second step and the third step.
3. The process for rapidly producing large thick plates by hot work die steel according to claim 1, which is characterized in that: the large depression in the third step is 20% -25% of the height of the forging stock.
4. The process for rapidly producing large thick plates by hot work die steel according to claim 1, which is characterized in that: and (3) carrying out temperature equalization between the fourth step and the fifth step, and carrying out secondary quenching after the temperature equalization.
5. The process for rapidly producing large thick plates by hot work die steel according to claim 1, which is characterized in that: the forging press in the second step adopts 5300-6300 ton forging press.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310610814.6A CN116516119A (en) | 2023-05-29 | 2023-05-29 | Process for rapidly producing large thick plate by hot working die steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310610814.6A CN116516119A (en) | 2023-05-29 | 2023-05-29 | Process for rapidly producing large thick plate by hot working die steel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116516119A true CN116516119A (en) | 2023-08-01 |
Family
ID=87397680
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310610814.6A Pending CN116516119A (en) | 2023-05-29 | 2023-05-29 | Process for rapidly producing large thick plate by hot working die steel |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116516119A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105525078A (en) * | 2015-11-15 | 2016-04-27 | 内蒙古北方重工业集团有限公司 | Preparation method for improving performance of 4Cr5MoSiV1 hot work die steel |
| CN107699801A (en) * | 2017-09-04 | 2018-02-16 | 唐山志威科技有限公司 | A kind of core rod ZW616 of plastic die steel containing V and preparation method thereof |
| CN111390086A (en) * | 2020-04-03 | 2020-07-10 | 扬州诚德重工有限公司 | Method for producing forge piece by unstability forging of continuous casting plate blank |
| CN115491571A (en) * | 2022-09-28 | 2022-12-20 | 河冶科技股份有限公司 | Preparation method of hot work die steel and hot work die steel |
| CN115852119A (en) * | 2022-12-23 | 2023-03-28 | 芜湖新兴铸管有限责任公司 | H13 ingot casting forging hot-work die steel and production method thereof |
-
2023
- 2023-05-29 CN CN202310610814.6A patent/CN116516119A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105525078A (en) * | 2015-11-15 | 2016-04-27 | 内蒙古北方重工业集团有限公司 | Preparation method for improving performance of 4Cr5MoSiV1 hot work die steel |
| CN107699801A (en) * | 2017-09-04 | 2018-02-16 | 唐山志威科技有限公司 | A kind of core rod ZW616 of plastic die steel containing V and preparation method thereof |
| CN111390086A (en) * | 2020-04-03 | 2020-07-10 | 扬州诚德重工有限公司 | Method for producing forge piece by unstability forging of continuous casting plate blank |
| CN115491571A (en) * | 2022-09-28 | 2022-12-20 | 河冶科技股份有限公司 | Preparation method of hot work die steel and hot work die steel |
| CN115852119A (en) * | 2022-12-23 | 2023-03-28 | 芜湖新兴铸管有限责任公司 | H13 ingot casting forging hot-work die steel and production method thereof |
Non-Patent Citations (4)
| Title |
|---|
| 夏琴香 等: "5CrNiMo热作模具钢模块锻造方法的数值模拟", 锻压技术, vol. 38, no. 5, pages 178 - 184 * |
| 张曜: "提升H13热作模具钢质量的工艺研究", 中国金属通报, no. 1, pages 132 - 133 * |
| 杨云志 等: "超大规格H13钢锻材组织与性能优化试验", 特钢技术, vol. 27, no. 4, pages 9 - 12 * |
| 谢珍勇: "4Cr5MoSiV1热作模具钢锻造加热工艺的改进", 特钢技术, vol. 12, no. 3, pages 32 - 35 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110257617B (en) | Forging and heat treatment method of large-size 20SiMn main shaft | |
| CN104911321B (en) | Extra-thick steel plate production process of plastic dies steel | |
| CN101684519B (en) | Method for improving heat treatment deformation of thin-wall light narrow series bearing ring | |
| CN111676355B (en) | Online solution treatment process for austenitic stainless steel plate | |
| CN102284835B (en) | Method for producing 10.9-class vehicle bolt of above M12 | |
| CN102554114A (en) | Ring forging and rolling processing method of bearing ring parts used for large-scale wind turbine unit | |
| CN102581145A (en) | Method for manufacturing high-hardness and high-abrasion-resistant pre-bending machine lower die | |
| CN103469092A (en) | Production method for main shaft of fan by using 34CrNiMo6 steel as raw material | |
| CN104962812B (en) | Hot continuous rolling axle housing steel and its manufacture method with good profile | |
| CN106636747A (en) | Manufacturing method for producing commercial pure titanium plate by adopting double annealing of heavy and medium plate mill | |
| CN102049669B (en) | Production technology for left valve barrel of colliery three-purposed hydraulic valve | |
| CN105132637A (en) | Two-liquid quenching tempering local strengthening heat treatment technology for oil press 5CrMnMo upper die | |
| CN106623423A (en) | Method for manufacturing commercial pure titanium plate through twice-heating production process by using heavy and medium plate mill | |
| CN101905244A (en) | Method for producing mandrel by utilizing 28NiCrMoV steel as raw material | |
| CN105274429A (en) | Production method for alloy filament | |
| CN111468668B (en) | Wind power main shaft forging process | |
| CN113695500A (en) | Gear shaft forging process | |
| CN105220067A (en) | The resonant rod of the radio-frequency (RF) device production method of invar cold-heading silk | |
| CN108642410B (en) | Process method for improving comprehensive mechanical property of aluminum alloy plate | |
| CN113046631B (en) | Free-cutting non-quenched and tempered steel and preparation method thereof | |
| CN111167984B (en) | Forging method for forging sector plate by using arc anvil | |
| CN108555202A (en) | A kind of manufacturing method of the embedded pin flat bar of diameter forging machine production core grade driving mechanism | |
| CN116516119A (en) | Process for rapidly producing large thick plate by hot working die steel | |
| RU2445399C1 (en) | Manufacturing method of flat hafnium profile | |
| CN116516118B (en) | Quick production process of plastic die steel |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |