CN101905244B - Method for producing mandrel by utilizing 28NiCrMoV steel as raw material - Google Patents
Method for producing mandrel by utilizing 28NiCrMoV steel as raw material Download PDFInfo
- Publication number
- CN101905244B CN101905244B CN2010102459199A CN201010245919A CN101905244B CN 101905244 B CN101905244 B CN 101905244B CN 2010102459199 A CN2010102459199 A CN 2010102459199A CN 201010245919 A CN201010245919 A CN 201010245919A CN 101905244 B CN101905244 B CN 101905244B
- Authority
- CN
- China
- Prior art keywords
- forging
- steel
- temperature
- normalizing
- raw material
- 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.)
- Active
Links
Images
Landscapes
- Forging (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
The invention belongs to the technical field of production of mandrels and relates to a method for producing a mandrel by utilizing 28NiCrMoV steel as a raw material. The mandrel is formed by sorting, refining, forging, rough machining, heat treatment and fine machining. The method comprises the following steps of: when refining, pouring into a steel ingot in an EAF and LF/VD way, demoulding the steel ingot and hot conveying to forge; before forging, controlling heating temperature to 1,150-1,200 DEG C and controlling initial forging temperature to 950-1,150 DEG C and final forging temperature to 750 DEG C in the forging process; and carrying out heat treatment in a normalizing and tempering process way. In the forging process, the feeding amount and the rolling reduction of an oil press are strictly controlled during upsetting; the mandrel is forged and moulded by adopting a precise forging machine of 1,400 tons during moulding; pulling and striking speed and deflection can be strictly controlled in a process of forging of the precise forging machine; and a heat treatment process is carried out in the normalizing and tempering way, thereby achieving the effect of improving strength limit and impact toughness.
Description
Technical field
The invention belongs to the plug production technical field, relate to the method for a kind of 28NiCrMoV of utilization steel for the raw material production plug.
Background technology
Plug is that modern technologies are produced one of necessary most important instrument of heavy caliber seamless steel pipe; This product environment for use in the roll seamless steel tube process is abominable; About 1150 ℃ of serviceability temperatures; Surface temperature can reach about 700 ℃ within a short period of time, and with after water spray cooling rapidly, and reach the standard grade once more rapidly and recycle.The cold and hot fatigue stress of high temperature that will bear big and complicated stretching, compression contact stress in the operation of rolling and circulate at a high speed.Mainly scrapping defective is the crackle that the scuffing on surface checking, ring crack and the axis causes, this is to be caused by multiple combined factors effect.The technical data of domestic plug production aspect is less; External plug manufacturer is very secret to this production technology; Along with going deep into to plug research; Both sides of supply and demand also reach unanimity to the understanding that influences plug factor in service life, promptly improve service life through strength degree and the impact flexibility that improves material, and its core technology is smelting, forging and the Technology for Heating Processing of ultra-clean steel.Existing the most frequently used a kind of mandrel material both at home and abroad is the H13 steel, but its transverse impact toughness is difficult for assurance, and production cost is too high.
Summary of the invention
Goal of the invention of the present invention is to provide the method for a kind of 28NiCrMoV of utilization steel for the raw material production plug, and this method can improve the strength degree and the impact flexibility of plug.
The present invention adopts following technical scheme:
A kind of method of utilizing the 28NiCrMoV steel for the raw material production plug, through select materials-refining-forging-roughing-heat treatment-fine finishining forms, the control heating-up temperature is 1150-1200 ℃ before the said forging; The control initial forging temperature is 950-1150 ℃ in the forging process; Final forging temperature is 750 ℃, adopts the mode of jumping-up, pulling during forging, and control jumping-up coefficient is greater than 2 during jumping-up; Controlling each passage during pulling, to draw the speed of beating be 4-6m/min, and it is 2-3m/min that last passage is drawn the speed of beating; Adopt normalizing+hardening and tempering process mode to carry out during said heat treatment, normalizing temperature is 870-900 ℃, and temperature retention time is 0.8-1h/100mm; The normalizing after wind is chilled to room temperature, quenches then, and hardening heat is 860-890 ℃; Temperature retention time is 0.8-1h/100mm, puts into the water that temperature is lower than 25 ℃ after the quenching and cools off, and carries out tempering at 520-580 ℃ then; Temperature retention time is 1.5-2h/100mm, below the air cooling to 100 ℃ of coming out of the stove.
Select for use the 28NiCrMoV10 steel as raw material during said refining, adopt the refining of EAF+LF/VD mode, pour into steel ingot, forging is sent in steel ingot demoulding after heat.
Said refining process control chemical composition is: C=0.26～0.32%, Si=0.30～0.50%, Mn=0.20～0.40%; Ni=2.30～2.60%, Cr=0.70～0.90%, Mo=0.55～0.70%; V=0.25～0.32%, S≤0.005%, P≤0.013%.
Adopt hydraulic press during said jumping-up, control feed 300-500mm, drafts 100-200mm.
Said drawing adopted 1400 tons of precise forging machine when beating, the control deflection is 50-80mm.
Adopt blower fan air blast forced air-cooling after the said normalizing during air cooling.
The present invention selects for use the 28NiCrMoV steel as raw material, in forging process, needs the feed and the drafts of strict control hydraulic press during jumping-up, so that steel ingot inside produces distortion greatly, effectively improves the lateral performance of workpiece, and effectively the steel ingot internal flaw is closed in forging; Adopt 1400 tons of precise forging machine forging and moldings during shaping, precise forging machine is forged strict control and is drawn dozen speed and deflection, guarantees plug performance each several part uniformity; Technology for Heating Processing adopts normalizing+modified mode to carry out, but through normalizing crystal grain thinning and uniform formation and composition, ready for quenching; Air-cooled after the normalizing, cooling velocity is fast, and crystal grain is refinement well; And eliminate thick lamellar pearlite and uniform formation and composition, adopt the low temperature water-cooling pattern when quenching simultaneously, improved cooling velocity and full hardening deepness; Make the whole through hardening in the whole cross section of workpiece, reduce residual austenite content to greatest extent, obtain martensitic structure; Guaranteed that the quench cooled earthquake intensity is intoo drastic again, so intensity is arranged in pairs or groups well with impacting, comprehensive mechanical property is high; Obtain the tiny and uniform tempered sorbite through high tempering again, thereby reach the effect that improves strength degree and impact flexibility.
Description of drawings
Fig. 1 is a Technology for Heating Processing flow chart of the present invention.
The specific embodiment
Embodiment 1: selecting the plug steel grade for use is 28NiCrMoV10, through select materials-refining-forging-roughing-heat treatment-fine finishining forms, EAF+LF/VD refining mode is adopted in the back of selecting materials, furnace charge by secondary or the above steel scrap of secondary, return stub bar, high-quality conversion pig, sponge iron etc. and form; Tap after the EAF oxidation, the LF/VD ar blowing refining is carried out in pre-deoxidation and partially-alloyed in the bag; The weak stirring before the tapping, argon for protecting pouring is adopted in the calm back of tapping, and forging is sent in steel ingot demoulding after heat; The control chemical composition is in the refining process: C=0.26～0.32%, Si=0.30～0.50%, Mn=0.20～0.40%; Ni=2.30～2.60%, Cr=0.70～0.90%, Mo=0.55～0.70%; V=0.25～0.32%, S≤0.005%, P≤0.013%; Heating in the formula gas furnace at the bottom of the car then, furnace temp is 1150 ℃, and blank temperature allows than low 20 ℃ of furnace temperature; With 950 ℃ of the initial forging temperatures that guarantee blank and 750 ℃ of final forging temperatures, in forging process: adopt the hydraulic press jumping-up, control jumping-up coefficient is greater than 2; Control feed 500mm, drafts 200mm adopts 1400 tons of precise forging machine to forge then; The control deflection is 80mm, and each passage is drawn and beaten speed controlling 6 meters of per minutes, and last passage is drawn and beaten speed controlling 3 meters of per minutes; Heat-treat after the roughing, adopt normalizing+hardening and tempering process mode to carry out, as shown in Figure 1, carry out normalizing earlier; Normalizing temperature is 870 ℃, and temperature retention time adopts 1 hour/100mm, adopts the axial blower air blast to force to be cooled to room temperature after the normalizing, for increasing air cooling effect; Can improve the base plate height, place formula chassis both sides and front side at the bottom of the car respectively, be directly injected on the workpiece, force evenly cooling fast of workpiece from a plurality of orientation with six typhoon machines; In order to crystal grain thinning and uniform formation and composition, ready for quenching, adopt modifier treatment technology after the normalizing; Hardening heat adopts 860 ℃, and temperature retention time adopts 1 hour/100mm, makes workpiece heart portion reach set point of temperature, accomplishes the austenite transformation and makes its homogenising; The water of putting into then less than 25 ℃ cools off continuously, obtains martensitic structure, carries out high tempering at 520 ℃ again; Temperature retention time adopts 2 hours/100mm, and the continuation of carrying out martensite decomposition and retained austenite changes, and obtains tiny and uniform tempered sorbite tissue; Come out of the stove below the air cooling to 100 ℃, mechanical property satisfies the high strength limit used and the requirement of impact flexibility, carries out fine finishining then.
Embodiment 2: selecting the plug steel grade for use is 28NiCrMoV10, through select materials-refining-forging-roughing-heat treatment-fine finishining forms, EAF+LF/VD refining mode is adopted in the back of selecting materials, furnace charge by secondary or the above steel scrap of secondary, return stub bar, high-quality conversion pig, sponge iron etc. and form; Tap after the EAF oxidation, the LF/VD ar blowing refining is carried out in pre-deoxidation and partially-alloyed in the bag; The weak stirring before the tapping, argon for protecting pouring is adopted in the calm back of tapping, and forging is sent in steel ingot demoulding after heat; The control chemical composition is in the refining process: C=0.26～0.32%, Si=0.30～0.50%, Mn=0.20～0.40%; Ni=2.30～2.60%, Cr=0.70～0.90%, Mo=0.55～0.70%; V=0.25～0.32%, S≤0.005%, P≤0.013%; Heating in the formula gas furnace at the bottom of the car then, furnace temp is 1180 ℃, and blank temperature allows than low 40 ℃ of furnace temperature; With 1050 ℃ of the initial forging temperatures that guarantee blank and 750 ℃ of final forging temperatures, in forging process: adopt the hydraulic press jumping-up, control jumping-up coefficient is greater than 2; Control feed 400mm, drafts 150mm adopts 1400 tons of precise forging machine to forge then; The control deflection is 60mm, and each passage is drawn and beaten speed controlling 5 meters of per minutes, and last passage is drawn and beaten speed controlling 2.5 meters of per minutes; Heat-treat after the roughing, adopt normalizing+hardening and tempering process mode to carry out, as shown in Figure 1, carry out normalizing earlier; Normalizing temperature is 890 ℃, and temperature retention time adopts 0.9 hour/100mm, adopts the axial blower air blast to force to be cooled to room temperature after the normalizing, for increasing air cooling effect; Can improve the base plate height, place formula chassis both sides and front side at the bottom of the car respectively, be directly injected on the workpiece, force evenly cooling fast of workpiece from a plurality of orientation with six typhoon machines; In order to crystal grain thinning and uniform formation and composition, ready for quenching, adopt modifier treatment technology after the normalizing; Hardening heat adopts 880 ℃, and temperature retention time adopts 0.9 hour/100mm, makes workpiece heart portion reach set point of temperature, accomplishes the austenite transformation and makes its homogenising; The water of putting into then less than 25 ℃ cools off continuously, obtains martensitic structure, carries out high tempering at 550 ℃ again; Temperature retention time adopts 1.8 hours/100mm, and the continuation of carrying out martensite decomposition and retained austenite changes, and obtains tiny and uniform tempered sorbite tissue; Come out of the stove below the air cooling to 100 ℃, mechanical property satisfies the high strength limit used and the requirement of impact flexibility, carries out fine finishining then.
Embodiment 3: selecting the plug steel grade for use is 28NiCrMoV10, through select materials-refining-forging-roughing-heat treatment-fine finishining forms, EAF+LF/VD refining mode is adopted in the back of selecting materials, furnace charge by secondary or the above steel scrap of secondary, return stub bar, high-quality conversion pig, sponge iron etc. and form; Tap after the EAF oxidation, the LF/VD ar blowing refining is carried out in pre-deoxidation and partially-alloyed in the bag; The weak stirring before the tapping, argon for protecting pouring is adopted in the calm back of tapping, and forging is sent in steel ingot demoulding after heat; The control chemical composition is in the refining process: C=0.26～0.32%, Si=0.30～0.50%, Mn=0.20～0.40%; Ni=2.30～2.60%, Cr=0.70～0.90%, Mo=0.55～0.70%; V=0.25～0.32%, S≤0.005%, P≤0.013%; Heating in the formula gas furnace at the bottom of the car then, furnace temp is 1200 ℃, and blank temperature allows than low 50 ℃ of furnace temperature; With 1150 ℃ of the initial forging temperatures that guarantee blank and 750 ℃ of final forging temperatures, in forging process: adopt the hydraulic press jumping-up, control jumping-up coefficient is greater than 2; Control feed 300mm, drafts 100mm adopts 1400 tons of precise forging machine to forge then; The control deflection is 50mm, and each passage is drawn and beaten speed controlling 4 meters of per minutes, and last passage is drawn and beaten speed controlling 2 meters of per minutes; Heat-treat after the roughing, adopt normalizing+hardening and tempering process mode to carry out, as shown in Figure 1, carry out normalizing earlier; Normalizing temperature is 900 ℃, and temperature retention time adopts 0.8 hour/100mm, adopts the axial blower air blast to force to be cooled to room temperature after the normalizing, for increasing air cooling effect; Can improve the base plate height, place formula chassis both sides and front side at the bottom of the car respectively, be directly injected on the workpiece, force evenly cooling fast of workpiece from a plurality of orientation with six typhoon machines; In order to crystal grain thinning and uniform formation and composition, ready for quenching, adopt modifier treatment technology after the normalizing; Hardening heat adopts 890 ℃, and temperature retention time adopts 0.8 hour/100mm, makes workpiece heart portion reach set point of temperature, accomplishes the austenite transformation and makes its homogenising; The water of putting into then less than 25 ℃ cools off continuously, obtains martensitic structure, carries out high tempering at 580 ℃ again; Temperature retention time adopts 1.5 hours/100mm, and the continuation of carrying out martensite decomposition and retained austenite changes, and obtains tiny and uniform tempered sorbite tissue; Come out of the stove below the air cooling to 100 ℃, mechanical property satisfies the high strength limit used and the requirement of impact flexibility, carries out fine finishining then.
Above each embodiment and corresponding reference examples product are tested result such as following table 1 by GB/T 228 with GB/T 229 existing testing standards.The product that reference examples adopts common process to produce does not carry out jumping-up during forging, air cooling after the normalizing, and cooling velocity is slow, and grain refining effect is bad, and adopts oil cooling during quench cooled, and the quench cooled earthquake intensity is poor, causes the rich amount of intensity little, and ballistic work is on the low side; And the product of explained hereafter of the present invention carries out jumping-up when forging on the one hand, effectively improves the lateral performance of workpiece; Air-cooled after the normalizing on the other hand, cooling velocity is fast, and crystal grain is refinement well; And eliminate thick lamellar pearlite and uniform formation and composition, water-cooling pattern when adopting low temperature long when quenching has simultaneously improved cooling velocity and full hardening deepness; Reduce residual austenite content to greatest extent, obtain martensitic structure, guaranteed that the quench cooled earthquake intensity is intoo drastic again; So intensity is arranged in pairs or groups well with impacting, comprehensive mechanical property is high.
The test data of table 1 embodiment 1-3 and reference examples product
Remarks: during the impact absorbing energy test, got three lateral impact samples in the test piece, corresponding three impact values.
Found out that by last table 1 data the product comprehensive mechanical property of explained hereafter of the present invention is high, comprehensive mechanical property obviously is superior to the reference examples product, proves absolutely the significant superiority of technology of the present invention.
Claims (5)
1. method of utilizing the 28NiCrMoV steel for the raw material production plug; Through select materials-refining-forging-roughing-heat treatment-fine finishining forms; It is characterized in that: the control heating-up temperature is 1150-1200 ℃ before the said forging, and the control initial forging temperature is 950-1150 ℃ in the forging process, and final forging temperature is 750 ℃; Adopt the mode of jumping-up, pulling during forging; Control jumping-up coefficient is greater than 2 during jumping-up, and controlling each passage during pulling, to draw the speed of beating be 4-6m/min, and it is 2-3m/min that last passage is drawn the speed of beating; Adopt normalizing+hardening and tempering process mode to carry out during said heat treatment, normalizing temperature is 870-900 ℃, and temperature retention time is 0.8-1h/100mm; The normalizing after wind is chilled to room temperature, quenches then, and hardening heat is 860-890 ℃; Temperature retention time is 0.8-1h/100mm, puts into the water that temperature is lower than 25 ℃ after the quenching and cools off, and carries out tempering at 520-580 ℃ then; Temperature retention time is 1.5-2h/100mm, below the air cooling to 100 ℃ of coming out of the stove; Said refining process control chemical composition is: C=0.26～0.32%, Si=0.30～0.50%, Mn=0.20～0.40%; Ni=2.30～2.60%, Cr=0.70～0.90%, Mo=0.55～0.70%; V=0.25～0.32%, S≤0.005%, P≤0.013%.
2. the method for utilizing the 28NiCrMoV steel for the raw material production plug as claimed in claim 1; It is characterized in that: select for use the 28NiCrMoV10 steel as raw material during said refining; Adopt the refining of EAF+LF/VD mode, pour into steel ingot, forging is sent in steel ingot demoulding after heat.
According to claim 1 or claim 2 utilize the method for 28NiCrMoV steel for the raw material production plug, it is characterized in that: adopt hydraulic press, control feed 300-500mm, drafts 100-200mm during said jumping-up.
4. the method for utilizing the 28NiCrMoV steel for the raw material production plug as claimed in claim 3 is characterized in that: said drawing adopted 1400 tons of precise forging machine when beating, the control deflection is 50-80mm.
5. the method for utilizing the 28NiCrMoV steel for the raw material production plug as claimed in claim 4 is characterized in that: adopt blower fan air blast forced air-cooling after the said normalizing when air-cooled.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102459199A CN101905244B (en) | 2010-08-05 | 2010-08-05 | Method for producing mandrel by utilizing 28NiCrMoV steel as raw material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102459199A CN101905244B (en) | 2010-08-05 | 2010-08-05 | Method for producing mandrel by utilizing 28NiCrMoV steel as raw material |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101905244A CN101905244A (en) | 2010-12-08 |
| CN101905244B true CN101905244B (en) | 2012-01-04 |
Family
ID=43260916
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010102459199A Active CN101905244B (en) | 2010-08-05 | 2010-08-05 | Method for producing mandrel by utilizing 28NiCrMoV steel as raw material |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101905244B (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102029347B (en) * | 2010-12-29 | 2012-07-04 | 中原特钢股份有限公司 | Manufacturing method of gear shaft forge piece for offshore drilling platform |
| CN103071746A (en) * | 2012-08-22 | 2013-05-01 | 昌利锻造有限公司 | Machining method for rear cylinder trunnion |
| CN103469092A (en) * | 2013-07-26 | 2013-12-25 | 中原特钢股份有限公司 | Production method for main shaft of fan by using 34CrNiMo6 steel as raw material |
| CN103555912B (en) * | 2013-11-01 | 2016-02-17 | 中原特钢股份有限公司 | A kind of 30Cr3MoV steel that utilizes is for the method for raw material production plug |
| CN104227350A (en) * | 2014-09-02 | 2014-12-24 | 中原特钢股份有限公司 | Preparing method of retained mandrel |
| CN105154627A (en) * | 2015-06-29 | 2015-12-16 | 中原特钢股份有限公司 | Production method for drilling tool materials used in low-temperature environment |
| CN105420471B (en) * | 2015-11-11 | 2018-01-19 | 中原特钢股份有限公司 | A kind of technique for improving normalizing hardness after 35 steel riders is forged |
| CN105603169B (en) * | 2016-03-07 | 2017-12-15 | 江苏大学 | The short route manufacture method of large-scale 30CrNi2MoV steel parts |
| CN106755854A (en) * | 2016-12-01 | 2017-05-31 | 河南中原重型锻压有限公司 | The heat treatment method of 4145H forging and the forging of production |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5946300B2 (en) * | 1979-03-14 | 1984-11-12 | 大同特殊鋼株式会社 | Steel for cold forging with excellent machinability and its manufacturing method |
| CN1040396A (en) * | 1988-08-13 | 1990-03-14 | 大连理工大学 | High strength and high toughness die steel for hammer forging |
| FI84370C (en) * | 1988-10-17 | 1991-11-25 | Rauma Repola Oy | Steel |
| DE19531260C5 (en) * | 1995-08-25 | 2006-06-22 | Edelstahlwerke Buderus Ag | Process for producing a hot-work tool steel |
| FR2780418B1 (en) * | 1998-06-29 | 2000-09-08 | Aubert & Duval Sa | CEMENTATION STEEL WITH HIGH INCOME TEMPERATURE, PROCESS FOR OBTAINING SAME AND PARTS FORMED THEREFROM |
| US6478898B1 (en) * | 1999-09-22 | 2002-11-12 | Sumitomo Metal Industries, Ltd. | Method of producing tool steels |
| CN1086965C (en) * | 1999-10-19 | 2002-07-03 | 赵士英 | Technology for manufacturing mandrel used to roll seamless steel tube |
| CN100343411C (en) * | 2003-08-28 | 2007-10-17 | 河南中原特殊钢厂 | Steel for processing movement limiting core stick of continuous tube grimper and its producing process |
| CN1940113A (en) * | 2006-05-31 | 2007-04-04 | 沈阳市铸威特殊钢有限公司 | Die steel |
| CN101352796A (en) * | 2007-07-24 | 2009-01-28 | 赵金发 | Novel technique for producing mandrel bar |
-
2010
- 2010-08-05 CN CN2010102459199A patent/CN101905244B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN101905244A (en) | 2010-12-08 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101905244B (en) | Method for producing mandrel by utilizing 28NiCrMoV steel as raw material | |
| CN101787419B (en) | Heat treatment process of AISI4340 steel forgings | |
| CN102899460B (en) | Heat treatment method for martensitic stainless steel forging module | |
| CN106319378B (en) | A kind of thin steel for saw blade substrate of major diameter and its manufacture method | |
| CN103469092A (en) | Production method for main shaft of fan by using 34CrNiMo6 steel as raw material | |
| CN103469091B (en) | A kind of large-size railway vehicle is with rolling over steel solid wheel and production method thereof | |
| CN104946870A (en) | Heat treatment method for strength of 28CrMoNiV steel capable of improving industrial steam turbine rotor forge piece | |
| CN106399860B (en) | A kind of method for manufacturing of 1Cr17Ni2 piston rods forging | |
| CN100509209C (en) | Steel-forged ball processing technique | |
| CN105925909B (en) | A kind of bearing steel wire rod and its production method | |
| CN106702099B (en) | Manufacturing process of large-specification 42CrMo4 quenched and tempered steel for outer main shaft of wind power speed increasing box | |
| CN103966411B (en) | A kind of manufacture method of medium carbon cold heading steel Bar Wire Product | |
| CN111101053B (en) | Working roll for wire rod rough rolling frame and manufacturing method thereof | |
| CN108085591A (en) | A kind of steel plate HTNM400 and its production method with low-welding crack-sensitive energy | |
| CN107686941A (en) | A kind of excellent wind-power tower steel plate of welding performance and its production method | |
| CN106834946A (en) | Big thickness protects Testing Tensile Strength at Elevated Temperature steel plate SA299GrB and preparation method thereof | |
| CN103753116B (en) | The manufacture method of sendzimir mill working roll | |
| CN104745787B (en) | Production method of tool steel capable of being directly cold rolled | |
| CN109136757A (en) | The production method of medium carbon cold heading steel wire rod and medium carbon cold heading steel wire rod | |
| CN105779897B (en) | A kind of M65 grades of electric resistance welding petroleum sleeve pipe and its manufacture method | |
| CN113930671A (en) | Steel plate for thick-specification high-strength high-toughness structure and preparation method thereof | |
| CN101818236A (en) | Method for manufacturing high carbon steel wheel | |
| WO2022166038A1 (en) | Hot rolled high strength steel long-shank bolt and manufacturing method therefor | |
| CN105154627A (en) | Production method for drilling tool materials used in low-temperature environment | |
| CN102230069B (en) | Heat treatment process for toughening wheel steel |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20181008 Address after: 459000 531 Industrial Park, Tiger Hill Industrial Cluster, Jiyuan City, Jiaozuo, Henan Patentee after: Henan Zhongyuan special steel equipment manufacturing Co., Ltd. Address before: 454685 Xiao Zhai village, Cheng Liu town, Jiyuan, Henan Patentee before: Zhongyuan Special Steel Co., Ltd. |
|
| TR01 | Transfer of patent right |