CN101905244A - 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
- CN101905244A CN101905244A CN 201010245919 CN201010245919A CN101905244A CN 101905244 A CN101905244 A CN 101905244A CN 201010245919 CN201010245919 CN 201010245919 CN 201010245919 A CN201010245919 A CN 201010245919A CN 101905244 A CN101905244 A CN 101905244A
- Authority
- CN
- China
- Prior art keywords
- forging
- steel
- temperature
- raw material
- 28nicrmov
- 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
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 a kind of 28NiCrMoV of utilization steel is produced plug for raw material method.
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 by strength degree and the impact flexibility that improves material, its core technology is smelting, forging and the Technology for Heating Processing of ultra-clean steel.Now the most frequently used a kind of mandrel material is the H13 steel both at home and abroad, 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 raw material production plug, and this method can improve the strength degree and the impact flexibility of plug.
The present invention is by the following technical solutions:
A kind of method of utilizing the 28NiCrMoV steel to produce plug for raw material, through select materials-refining-forging-roughing-heat treatment-fine finishining forms, the control heating-up temperature is 1150-1200 ℃ before the described 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 described heat treatment, normalizing temperature is 870-900 ℃, temperature retention time is 0.8-1h/100mm, and the normalizing after wind is chilled to room temperature, quenches then, 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 described refining, adopt the refining of EAF+LF/VD mode, pour into steel ingot, forging is sent in steel ingot demoulding after heat.
Described 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 described jumping-up, control feed 300-500mm, drafts 100-200mm.
Described 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 described 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 by 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 eliminates thick lamellar pearlite and uniform formation and composition, adopt the low temperature water-cooling pattern when quenching simultaneously, improve cooling velocity and full hardening deepness, made the whole through hardening in the whole cross section of workpiece, reduced residual austenite content to greatest extent, obtain martensitic structure, guaranteed that the quench cooled earthquake intensity is intoo drastic again, so intensity and impact collocation are good, the comprehensive mechanical property height; Obtain tiny and uniform tempered sorbite by 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, adopt EAF+LF/VD refining mode after selecting materials, furnace charge is by secondary or the above steel scrap of secondary, return stub bar, the high-quality conversion pig, compositions such as sponge iron, tap after the EAF oxidation, pre-deoxidation and partially-alloyed in the bag, carry out the LF/VD ar blowing refining, the weak stirring before the tapping, argon for protecting pouring is adopted in the calm back of tapping, 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 750 ℃ of 950 ℃ of initial forging temperatures guaranteeing blank and final forging temperatures, in forging process: adopt the hydraulic press jumping-up, control jumping-up coefficient is controlled feed 500mm, drafts 200mm greater than 2, adopt 1400 tons of precise forging machine to forge then, the control deflection is 80mm, and each passage draws the speed of beating to be controlled at 6 meters of per minutes, and last passage draws the speed of beating to be controlled at 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 ℃, temperature retention time adopts 1 hour/100mm, adopt 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 with six typhoon machines, be directly injected on the workpiece from a plurality of orientation, force evenly cooling fast of workpiece, 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, make workpiece heart portion reach set point of temperature, finish the austenite transformation and make 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, carry out that martensite decomposes and the continuation of retained austenite changes, obtain tiny and uniform tempered sorbite tissue, below the air cooling to 100 ℃ of coming out of the stove, mechanical property satisfies the high strength limit of use 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, adopt EAF+LF/VD refining mode after selecting materials, furnace charge is by secondary or the above steel scrap of secondary, return stub bar, the high-quality conversion pig, compositions such as sponge iron, tap after the EAF oxidation, pre-deoxidation and partially-alloyed in the bag, carry out the LF/VD ar blowing refining, the weak stirring before the tapping, argon for protecting pouring is adopted in the calm back of tapping, 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 750 ℃ of 1050 ℃ of initial forging temperatures guaranteeing blank and final forging temperatures, in forging process: adopt the hydraulic press jumping-up, control jumping-up coefficient is controlled feed 400mm, drafts 150mm greater than 2, adopt 1400 tons of precise forging machine to forge then, the control deflection is 60mm, and each passage draws the speed of beating to be controlled at 5 meters of per minutes, and last passage draws the speed of beating to be controlled at 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 ℃, temperature retention time adopts 0.9 hour/100mm, adopt 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 with six typhoon machines, be directly injected on the workpiece from a plurality of orientation, force evenly cooling fast of workpiece, 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, make workpiece heart portion reach set point of temperature, finish the austenite transformation and make 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, carry out that martensite decomposes and the continuation of retained austenite changes, obtain tiny and uniform tempered sorbite tissue, below the air cooling to 100 ℃ of coming out of the stove, mechanical property satisfies the high strength limit of use 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, adopt EAF+LF/VD refining mode after selecting materials, furnace charge is by secondary or the above steel scrap of secondary, return stub bar, the high-quality conversion pig, compositions such as sponge iron, tap after the EAF oxidation, pre-deoxidation and partially-alloyed in the bag, carry out the LF/VD ar blowing refining, the weak stirring before the tapping, argon for protecting pouring is adopted in the calm back of tapping, 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 750 ℃ of 1150 ℃ of initial forging temperatures guaranteeing blank and final forging temperatures, in forging process: adopt the hydraulic press jumping-up, control jumping-up coefficient is controlled feed 300mm, drafts 100mm greater than 2, adopt 1400 tons of precise forging machine to forge then, the control deflection is 50mm, and each passage draws the speed of beating to be controlled at 4 meters of per minutes, and last passage draws the speed of beating to be controlled at 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 ℃, temperature retention time adopts 0.8 hour/100mm, adopt 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 with six typhoon machines, be directly injected on the workpiece from a plurality of orientation, force evenly cooling fast of workpiece, 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, make workpiece heart portion reach set point of temperature, finish the austenite transformation and make 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, carry out that martensite decomposes and the continuation of retained austenite changes, obtain tiny and uniform tempered sorbite tissue, below the air cooling to 100 ℃ of coming out of the stove, mechanical property satisfies the high strength limit of use 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 and 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, carry out jumping-up when forging on the one hand, effectively improve the lateral performance of workpiece, air-cooled after the normalizing on the other hand, cooling velocity is fast, 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, reduces residual austenite content to greatest extent, obtain martensitic structure, guaranteed that the quench cooled earthquake intensity is intoo drastic again, so intensity and impact collocation are good, the comprehensive mechanical property height.
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.
Find out by last table 1 data, the product comprehensive mechanical property height of explained hereafter of the present invention, comprehensive mechanical property obviously is better than the reference examples product, proves absolutely the significant superiority of technology of the present invention.
Claims (6)
1. method of utilizing the 28NiCrMoV steel to produce plug for raw material, 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 described forging, the control initial forging temperature is 950-1150 ℃ in the forging process, 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, 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 described heat treatment, normalizing temperature is 870-900 ℃, temperature retention time is 0.8-1h/100mm, and the normalizing after wind is chilled to room temperature, quenches then, 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.
2. the method for utilizing the 28NiCrMoV steel to produce plug for raw material as claimed in claim 1, it is characterized in that: select for use the 28NiCrMoV10 steel as raw material during described refining, adopt the refining of EAF+LF/VD mode, pour into steel ingot, forging is sent in steel ingot demoulding after heat.
3. the method for utilizing the 28NiCrMoV steel to produce plug for raw material as claimed in claim 2, it is characterized in that: described 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%.
4. as each described method of utilizing the 28NiCrMoV steel to produce plug of claim 1 to 3, it is characterized in that: adopt hydraulic press, control feed 300-500mm, drafts 100-200mm during described jumping-up for raw material.
5. the method for utilizing the 28NiCrMoV steel to produce plug for raw material as claimed in claim 4 is characterized in that: described drawing adopted 1400 tons of precise forging machine when beating, the control deflection is 50-80mm.
6. the method for utilizing the 28NiCrMoV steel to produce plug for raw material as claimed in claim 5 is characterized in that: adopt blower fan air blast forced air-cooling after the described normalizing during air cooling.
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 true CN101905244A (en) | 2010-12-08 |
| CN101905244B 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) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102029347A (en) * | 2010-12-29 | 2011-04-27 | 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 |
| CN103555912A (en) * | 2013-11-01 | 2014-02-05 | 中原特钢股份有限公司 | Method for producing core rod by utilizing 30Cr3MoV steel as raw material |
| 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 |
| CN105420471A (en) * | 2015-11-11 | 2016-03-23 | 中原特钢股份有限公司 | Technique for improving normalizing hardness of forged 35 steel roller |
| CN105603169A (en) * | 2016-03-07 | 2016-05-25 | 江苏大学 | Short-process manufacture method for large 30CrNi2MoV steel piece |
| 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 |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4326886A (en) * | 1979-03-14 | 1982-04-27 | Daido Tokushuko Kabushiki Kaisha | Steel for cold forging having good machinability and the method of making the same |
| CN1040396A (en) * | 1988-08-13 | 1990-03-14 | 大连理工大学 | High strength and high toughness die steel for hammer forging |
| GB2224514A (en) * | 1988-10-17 | 1990-05-09 | Rauma Repola Oy | Steel and production thereof |
| DE19531260A1 (en) * | 1995-08-25 | 1997-02-27 | Buderus Edelstahlwerke Ag | New nickel-chromium-molybdenum-vanadium hot work steel |
| CN1251786A (en) * | 1999-10-19 | 2000-05-03 | 赵士英 | Technology for manufacturing mandrel used to roll seamless steel tube |
| US6478898B1 (en) * | 1999-09-22 | 2002-11-12 | Sumitomo Metal Industries, Ltd. | Method of producing tool steels |
| US6699333B1 (en) * | 1998-06-29 | 2004-03-02 | Aubert & Duval | Case hardened steel with high tempering temperature, method for obtaining same and parts formed with said steel |
| CN1616700A (en) * | 2003-08-28 | 2005-05-18 | 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
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4326886A (en) * | 1979-03-14 | 1982-04-27 | Daido Tokushuko Kabushiki Kaisha | Steel for cold forging having good machinability and the method of making the same |
| CN1040396A (en) * | 1988-08-13 | 1990-03-14 | 大连理工大学 | High strength and high toughness die steel for hammer forging |
| GB2224514A (en) * | 1988-10-17 | 1990-05-09 | Rauma Repola Oy | Steel and production thereof |
| DE19531260A1 (en) * | 1995-08-25 | 1997-02-27 | Buderus Edelstahlwerke Ag | New nickel-chromium-molybdenum-vanadium hot work steel |
| US6699333B1 (en) * | 1998-06-29 | 2004-03-02 | Aubert & Duval | Case hardened steel with high tempering temperature, method for obtaining same and parts formed with said steel |
| US6478898B1 (en) * | 1999-09-22 | 2002-11-12 | Sumitomo Metal Industries, Ltd. | Method of producing tool steels |
| CN1251786A (en) * | 1999-10-19 | 2000-05-03 | 赵士英 | Technology for manufacturing mandrel used to roll seamless steel tube |
| CN1616700A (en) * | 2003-08-28 | 2005-05-18 | 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 |
Non-Patent Citations (1)
| Title |
|---|
| 《江苏冶金》 19901231 叶为德 大型连轧管机组制管工具的研制 , 第6期 2 * |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102029347A (en) * | 2010-12-29 | 2011-04-27 | 中原特钢股份有限公司 | Manufacturing method of gear shaft forge piece for offshore drilling platform |
| 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 |
| CN103555912A (en) * | 2013-11-01 | 2014-02-05 | 中原特钢股份有限公司 | Method for producing core rod by utilizing 30Cr3MoV 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 |
| CN105420471A (en) * | 2015-11-11 | 2016-03-23 | 中原特钢股份有限公司 | Technique for improving normalizing hardness of forged 35 steel roller |
| 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 |
| CN105603169A (en) * | 2016-03-07 | 2016-05-25 | 江苏大学 | Short-process manufacture method for large 30CrNi2MoV steel piece |
| 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 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101905244B (en) | 2012-01-04 |
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 | |
| CN103469092A (en) | Production method for main shaft of fan by using 34CrNiMo6 steel as raw material | |
| CN102899460B (en) | Heat treatment method for martensitic stainless steel forging module | |
| CN118007026B (en) | Hot-rolled 1300 MPa-level B-containing spring steel wire rod and production process thereof | |
| CN104946870A (en) | Heat treatment method for strength of 28CrMoNiV steel capable of improving industrial steam turbine rotor forge piece | |
| CN105925909B (en) | A kind of bearing steel wire rod and its production method | |
| CN103469091A (en) | Large size rolled steel integral wheel used for railway vehicle and production method thereof | |
| CN103966411B (en) | A kind of manufacture method of medium carbon cold heading steel Bar Wire Product | |
| CN106702099B (en) | Manufacturing process of large-specification 42CrMo4 quenched and tempered steel for outer main shaft of wind power speed increasing box | |
| CN105441786B (en) | Tensile strength 1500MPa grades of hot press-formed use sheet metal and its CSP production methods | |
| CN111101053B (en) | Working roll for wire rod rough rolling frame and manufacturing method thereof | |
| CN106399860A (en) | Producing and manufacturing method for 1Cr17Ni2 piston rod forged piece | |
| CN118166190B (en) | Hot-rolled wire rod for 12.9-grade low-chromium fire-reducing bolt and manufacturing method thereof | |
| CN112813345A (en) | Non-quenched and tempered steel for cold machining engineering machinery hydraulic piston rod and preparation method | |
| CN112756525B (en) | Manufacturing method of 9% Ni steel oversized cake-shaped forging for ultralow temperature engineering | |
| CN105274429A (en) | Production method for alloy filament | |
| CN113930671A (en) | Steel plate for thick-specification high-strength high-toughness structure and preparation method thereof | |
| 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 | |
| CN109136757A (en) | The production method of medium carbon cold heading steel wire rod and medium carbon cold heading steel wire rod | |
| CN105274428A (en) | Production method for alloy filament with zero defect on surface | |
| WO2022166038A1 (en) | Hot rolled high strength steel long-shank bolt and manufacturing method therefor | |
| CN101818236A (en) | Method for manufacturing high carbon steel wheel | |
| 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 |