CN106540983A - A kind of high solidity major diameter rod material production technology - Google Patents
A kind of high solidity major diameter rod material production technology Download PDFInfo
- Publication number
- CN106540983A CN106540983A CN201610877199.5A CN201610877199A CN106540983A CN 106540983 A CN106540983 A CN 106540983A CN 201610877199 A CN201610877199 A CN 201610877199A CN 106540983 A CN106540983 A CN 106540983A
- Authority
- CN
- China
- Prior art keywords
- production technology
- rolling
- major diameter
- high temperature
- temperature
- 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
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 18
- 238000005516 engineering process Methods 0.000 title claims abstract description 13
- 239000000463 material Substances 0.000 title claims abstract description 12
- 238000005096 rolling process Methods 0.000 claims abstract description 30
- 238000005242 forging Methods 0.000 claims abstract description 22
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 19
- 239000010959 steel Substances 0.000 claims abstract description 19
- 238000009792 diffusion process Methods 0.000 claims abstract description 17
- 238000012545 processing Methods 0.000 claims abstract description 12
- 238000010438 heat treatment Methods 0.000 claims abstract description 6
- 238000000034 method Methods 0.000 claims description 19
- 230000008569 process Effects 0.000 claims description 10
- 230000007547 defect Effects 0.000 abstract description 22
- 239000013078 crystal Substances 0.000 abstract description 7
- 238000000265 homogenisation Methods 0.000 abstract description 5
- 230000035876 healing Effects 0.000 abstract description 3
- 239000007769 metal material Substances 0.000 abstract description 3
- 239000000203 mixture Substances 0.000 abstract description 3
- 230000008901 benefit Effects 0.000 abstract description 2
- 230000008034 disappearance Effects 0.000 abstract description 2
- 238000009749 continuous casting Methods 0.000 description 15
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 230000009467 reduction Effects 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000014759 maintenance of location Effects 0.000 description 3
- 238000003801 milling Methods 0.000 description 3
- 238000001953 recrystallisation Methods 0.000 description 3
- 238000005275 alloying Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- 208000037656 Respiratory Sounds Diseases 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000001112 coagulating effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000010813 municipal solid waste Substances 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/04—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of bars or wire
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
- B21K29/00—Arrangements for heating or cooling during processing
-
- 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
- C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Forging (AREA)
- Metal Rolling (AREA)
Abstract
A kind of high solidity major diameter rod material production technology, belongs to metal material plastic working field, by heating after round strand carry out draw out deep processing；Steel billet is carried out into High temperature diffusion process；Blank is carried out into finishing rolling.The invention has the advantages that：High temperature forging closes hole defect, and closure interface fully is pressed close to contact with each other, and is that transboundary continuously growth creates conditions crystal grain；Soak accelerates atoms permeating to be conducive to hole fully disappearance defect healing so that seam regional chemistry composition and microscopic structure homogenization；Product quality is significantly improved in the case of a small amount of production cost is only increased.
Description
Technical field
The invention belongs to metal material plastic working field, and in particular to eliminate and produce major diameter rod by heavy in section continuous casting billet
Material product Hole type defect, obtains the process of high solidity product.
Background technology
Heavy in section continuous casting billet lumber recovery is high, manufacturing cost is relatively low, and practical value is obvious.Generally heavy forging material internal is tight
The seam of contact interface is mainly realized by mechanism such as dislocation diffusion, interface diffusion and diffusion into the surfaces, it is clear that high temperature long-time has
Beneficial to the interfacial weld.But determined by coagulating property, inside which, be inevitably present various defects, such as pore, shrinkage cavity and in
The defects such as the heart is loose, segregation, field trash, crackle.Wherein hole type defect is the principal mode of heavy in section continuous casting billet internal flaw,
Its presence destroys the seriality of metal material, is susceptible to stress concentration and Crack Damage, leads in forging and the operation of rolling
During causing to be on active service, forging severe life time reduction is even scrapped.
At present, the hole type defect in the continuous casting billet of heavy in section is difficult to by way of improving continuous casting technology disappear well
Remove, mainly by subsequent thermal processing solving.Traditional large-scale bar generally using forging or rolls both techniques
Production, number of patent application is 201010578599.9《Forging rolling New process combining》The original traditional processing technology skill of technological break-through
Art flow process so that the mechanical property and performance of pole shape steel product is able to greatly enhance and improves.
In recent years with the development of industry, market proposes tightened up requirement to the specification and quality of continuous casting billet product, more
Urgent requirement developing heavy in section, the continuous casting billet of super-section.Domestic iron and steel enterprises in 2009 start to produce a diameter of Ф as a trial
600mm, Ф 800mm continuous casting billets, product quality are reached the international leading level in succession, can produce within 2010 a diameter of Ф 900mm
The continuous casting billet of specification, Jiangyin company successfully develops the continuous casting billet that diameter reaches Ф 1000mm within 2011.But continuous casting billet section
Size is bigger, and its central defect is more serious, it is necessary to develop new technique to meet actual demands of engineering.
The content of the invention
For the disadvantages described above that the technological process that major diameter bar product is produced using heavy in section continuous casting billet is present, in order to disappear
Except hole type defect, the present invention proposes a kind of high solidity major diameter rod material production technology.
The present invention includes following sequential steps：
1）Round strand after by heating carries out draw out deep processing, hole type defect is closed by the step；
2）Steel billet is carried out into High temperature diffusion process, welded closed defect is made by the step；
3）Blank is carried out into finishing rolling.
In step 1 of the present invention）In, by draw out deep processing, forging deflection is big, and core deformation infiltration is complete,
Hole type defect is constantly caved under the collective effect of compressive stress and shearing force, makes cave fillings and close interface fully to press close to phase
Mutually contact, be that transboundary continuously growth creates conditions crystal grain.Plastic strain in plastic processing, in closure near interface shape
Into organizational structuries such as substantial amounts of dislocation, sub boundary, crystal boundary and rooms, stress concentration is serious.What these plastic deformations were produced lacks
Fall into and express passway is provided for Elements Diffusion, also provide driving force for recrystallization.Meanwhile, shearing fortune is susceptible between the interface of laminating
Oxide-film that is dynamic and destroying interface, is conducive to subsequent alloying element atoms permeating.
Although hole type defect is closed completely after draw out, interface does not still thoroughly eliminate, material property
Essential improvement is obtained not yet.In step 2 of the present invention）In, increase High temperature diffusion insulation operation before the rolling, it is possible to use forged
Dislocation that journey is produced, room, subgrain, substructure and the stress concentration such as recrystallization, realize alloying element atom around interface
It is quick to spread, and improve holding temperature, extend temperature retention time, be conducive to the abundant forming core of new recrystal grain and growth, most
Closure interface healing band is eliminated eventually, microstructure homogenization is realized, reaching improves the purpose of performance.
Finally, employing finishing rolling mill practice can meet the lengthening coefficient requirement of blank, and the dimensional accuracy for meeting steel part will
Ask, the dimensional accuracy of product is significantly larger than traditional forging products precision, substantially reduces the workload of follow-up cold conditions finishing procedure,
Greatly shorten life cycle of the product.Simultaneously to step 2）Soak play assosting effect, improve hole seam process.This
Outward, caused by rolling deformation recrystallization can further crystal grain thinning, promotion core area chemical analysis and microscopic structure it is uniform
Change.
It is an advantage of the current invention that：（1）High temperature forging closes hole defect, and closure interface fully is pressed close to contact with each other,
For crystal grain, transboundary continuously growth creates conditions；（2）Soak accelerates atoms permeating to be conducive to hole fully disappearance defect healing,
So that seam regional chemistry composition and microscopic structure homogenization；（3）Produced with milling method, rolling deformation is continuous, finished size
High precision, while further speeding up hole seam eliminates defect；（4）Simple production process, production efficiency are high, are only increasing a small amount of
Product quality is significantly improved in the case of production cost.
In a word, the present invention between forging process and rolling process increases High temperature diffusion treatment process steps, its objective is
Accelerate hole seam process, prevent the tension in the operation of rolling from closure hole is pulled open again, be conducive to improve product quality
And qualification rate.Bar product of the major diameter without hole type defect can be produced using the inventive method.
Further, step 1 of the present invention）During middle draw out deep processing, the initial forging temperature of circle strand is
1200 DEG C, final forging temperature is 1000 DEG C.The thermoplasticity of continuous casting billet is reduced with the decline of temperature, and its resistance of deformation is then risen therewith
Height, when forging temperature is less than 1000 DEG C, its plastic fluidity is poor, is unfavorable for cave fillings, thus forging temperature should be controlled
More than 1000 DEG C.If heating-up temperature is too high, crystal grain is grown up rapidly becomes thick, reduces mechanical property, therefore the forging temperature that begins
Degree control is below 1200 DEG C.
The step 1）In, every time drafts is 100mm～150mm, the minimum pulling of draw out deep processing
Than for 1.5: 1.When pulling than less than 1.5 when, hole interface be part fit, by it is whole link up gap be divided into some compared with
Little hole, and then seam cannot be realized in subsequent heat treatment and hot procedure.When pulling is than more than 1.5, hole is complete
Complete closure and close interface fully press close to contact with each other, be material transmission and crystal grain transboundary continuously growth create conditions.
The step 2）Described in High temperature diffusion process when steel billet temperature be 1150 DEG C～1220 DEG C, the time be 3～15
Hour.
According to Fick First Laws, diffusion coefficient exponentially increases as temperature is raised, therefore heating-up temperature is higher, more sharp
In diffusion；Simultaneously to occur overheated and burn-off phenomenon in preventing insulating process, heating-up temperature should control 1150 DEG C ~ 1220 DEG C it
Between.High temperature diffusion process is repaired beneficial to defect atoms permeating, and as no plastic deformation and pressure-driven accelerate diffusion
Effect, defect self-diffusion repair process are slower, it is therefore desirable to time enough, form firm metallic bond and then weld between atom
Close.Temperature retention time needed for the steel billet of unlike material different size is different, and larger-diameter steel billet heat insulating is after 15 hours, inner void
The seam of type defect completely, reaches metallurgical binding, realizes microstructure homogenization；Energy saving is based on simultaneously, reduces iron loss, it is maximum
Temperature retention time was selected as 15 hours.
The step 3）In, every time drafts≤100mm, the rolling of finishing rolling compare for 1.2～2.5: 1.It is full
The lengthening coefficient requirement of sufficient blank and the high accuracy dimensional requirement of steel part, are less than or equal to the drafts of 100mm using every time
Carry out finishing rolling.In combination with the production task demand of various different size bars, blank practical distortion scope is big, its rolling
Than should be between 1.2～2.5: 1.
Specific embodiment
Employing present invention process described further below produces the specific embodiment of Φ 600mm major diameter Q345D round steel, main
Forging press, high-temperature heater and the heavy merchant mill utilized by sequential series arrangement cooperates and performs following technique road
Line：Continuous casting billet heating, pressing tongs handle, draw out, pre- finish rolling rolling, finishing rolling, cooling, aligning, packing and warehouse-in.
Circular continuous casting billet of the billet bloom size adopted in the present embodiment for Φ 900mm, as the present invention adopts hammer cogging,
With very big compatibility, it is easy to the blank using plurality of specifications, the technique of committed step is as follows：
First, draw out deep processing：Round strand after by heating sends into forcing press, using the drafts of Δ H=100mm/ passages
Carry out pulling operation, every time rotary billet draw out make blank extensional between upper and lower V-type anvil, by forging plus
Eight prism shapes of work diagonally line length 700mm, this operation realize pulling than for 1.65: 1.
The present embodiment adopts large-sized forging forcing press, is operated using larger reduction in pass, can be met large-scale
The compression ratio of bar is required, it is therefore an objective to is made cave fillings and is closed interface fully to fit, be that subsequent defective seam creates conditions, together
When be conducive to improving the internal soundness of material so that the mechanical property of final great circle rod steel product is significantly improved, and is significantly carried
High cogging efficiency.Substantial amounts of deformation heat can be produced simultaneously, maintained the temperature of blank, be also beneficial to defect seam.
2nd, High temperature diffusion：Steel after hammer cogging are sent to into high-temperature heater immediately, 5 hours are incubated at 1200 DEG C.
Soak can accelerate atoms permeating, be conducive to the abundant forming core of recrystal grain and growth, eliminate the hole interface of closure, real
Existing seam and metallurgical binding, and make seam regional chemistry composition and microscopic structure homogenization.
3rd, finishing rolling：The octagonal hole type design of diagonal line length 625mm is adopted on milling train, it is prismatic to above-mentioned eight
Shape blank carries out finishing rolling, 90 ° of every time double steel, and roll reduction is Δ H=80mm/ passages, it is ensured that metal grain degree is equal
Even property.In the present embodiment, after pre- finish rolling, the section configuration of steel billet is octagonal, and its overall size substantially 680 × 602mm is real
Now rolling compares 1.23: 1.
The lengthening coefficient requirement of blank can be met by pre- finishing rolling step, the high accuracy dimensional requirement of steel part is met, much
More than the dimensional accuracy of traditional forging, the production of overlength, high dimensional accuracy and high performance steel can be completed by pre- finish rolling system
Require.
Finish rolling is carried out using Φ 600mm finished products circular holes on milling train, using small deformation amount Δ H=30mm/ passages, finishing
The surface of blank so that surface size is more accurate, this operation realize that rolling compares 1.20: 1.
Rollgang coordinates straightener, completes the thermal straightening of extrusion bar of large cross section especially long bar.
Hot-rolled finished product is made by finish rolling, due to the finish rolling system using light reduction, the dimensional accuracy of final products is much
Higher than the dimensional accuracy of traditional forging product, the workload of follow-up cold conditions finishing procedure is substantially reduced, product is greatly shortened
Production cycle.Using above-mentioned Technology, the hole type defect of large-diameter circular bar steel material is eliminated so that the mechanics of final products
Performance, performance and shape of product precision are significantly improved.
Claims (5)
1. a kind of high solidity major diameter rod material production technology, it is characterised in that including following sequential steps：
1）Round strand after by heating carries out draw out deep processing；
2）Steel billet is carried out into High temperature diffusion process；
3）Blank is carried out into finishing rolling.
2. production technology according to claim 1, it is characterised in that：The step 1）Middle draw out deep processing process
The initial forging temperature of middle round strand is 1200 DEG C, and final forging temperature is 1000 DEG C.
3. production technology according to claim 1 and 2, it is characterised in that：The step 1）In, every time drafts is
100mm～150mm, the minimum pulling of draw out deep processing is than being 1.5: 1.
4. production technology according to claim 1 and 2, it is characterised in that：The step 2）Described in High temperature diffusion process
When steel billet temperature be 1150 DEG C～1220 DEG C, the time be 3～15 hours.
5. production technology according to claim 1 and 2, it is characterised in that：The step 3）In, every time drafts≤
100mm, the rolling of finishing rolling compare for 1.2～2.5: 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610877199.5A CN106540983A (en) | 2016-10-09 | 2016-10-09 | A kind of high solidity major diameter rod material production technology |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610877199.5A CN106540983A (en) | 2016-10-09 | 2016-10-09 | A kind of high solidity major diameter rod material production technology |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106540983A true CN106540983A (en) | 2017-03-29 |
Family
ID=58368358
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610877199.5A Pending CN106540983A (en) | 2016-10-09 | 2016-10-09 | A kind of high solidity major diameter rod material production technology |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106540983A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113752082A (en) * | 2021-09-17 | 2021-12-07 | 苏州鼎隆精密机械制造有限公司 | Production process of precise concentric shaft |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0489111A (en) * | 1990-08-02 | 1992-03-23 | Kawasaki Steel Corp | Method for joining billets in hot rolling |
| CN1251786A (en) * | 1999-10-19 | 2000-05-03 | 赵士英 | Technology for manufacturing mandrel used to roll seamless steel tube |
| CN102069345A (en) * | 2009-11-25 | 2011-05-25 | 宝山钢铁股份有限公司 | Method for manufacturing large-specification steel pipe retained mandrel |
| CN102126121A (en) * | 2010-12-08 | 2011-07-20 | 扬州诚德重工有限公司 | New process combining forging and rolling |
| CN102477518A (en) * | 2010-11-24 | 2012-05-30 | 宝山钢铁股份有限公司 | Steel used for steam turbine blades and manufacturing method thereof |
| CN102581186A (en) * | 2012-02-15 | 2012-07-18 | 德谦杭重锻造有限公司 | Method for controlling internal defect of large forging |
| CN103352171A (en) * | 2013-07-12 | 2013-10-16 | 抚顺特殊钢股份有限公司 | High-alloy steel D2 rolling method |
| US20160271665A1 (en) * | 2015-03-20 | 2016-09-22 | Showa Denko K.K. | Aluminum bar and method for producing same |
-
2016
- 2016-10-09 CN CN201610877199.5A patent/CN106540983A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0489111A (en) * | 1990-08-02 | 1992-03-23 | Kawasaki Steel Corp | Method for joining billets in hot rolling |
| CN1251786A (en) * | 1999-10-19 | 2000-05-03 | 赵士英 | Technology for manufacturing mandrel used to roll seamless steel tube |
| CN102069345A (en) * | 2009-11-25 | 2011-05-25 | 宝山钢铁股份有限公司 | Method for manufacturing large-specification steel pipe retained mandrel |
| CN102477518A (en) * | 2010-11-24 | 2012-05-30 | 宝山钢铁股份有限公司 | Steel used for steam turbine blades and manufacturing method thereof |
| CN102126121A (en) * | 2010-12-08 | 2011-07-20 | 扬州诚德重工有限公司 | New process combining forging and rolling |
| CN102581186A (en) * | 2012-02-15 | 2012-07-18 | 德谦杭重锻造有限公司 | Method for controlling internal defect of large forging |
| CN103352171A (en) * | 2013-07-12 | 2013-10-16 | 抚顺特殊钢股份有限公司 | High-alloy steel D2 rolling method |
| US20160271665A1 (en) * | 2015-03-20 | 2016-09-22 | Showa Denko K.K. | Aluminum bar and method for producing same |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113752082A (en) * | 2021-09-17 | 2021-12-07 | 苏州鼎隆精密机械制造有限公司 | Production process of precise concentric shaft |
| CN113752082B (en) * | 2021-09-17 | 2023-12-12 | 苏州鼎隆精密机械制造有限公司 | Production process of precise concentric shaft |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP6515376B2 (en) | Construction molding method for manufacturing homogenized forgings | |
| CN106475500B (en) | A kind of Heavy Pan Forgings forging technology | |
| CN104511726B (en) | Five cylinder pressure break pump crankcase manufacture method of Whole fiber Integral die-forged | |
| CN104175062B (en) | All-fiber-texture large-size double-flange fan main shaft forging method | |
| CN101787492A (en) | Manufacturing method of high quality and large size mandril blank | |
| CN103894792A (en) | Method for machining forge piece of large-scale single-flange anti-explosion motor main shaft of all-fiber texture | |
| CN104307890A (en) | Combined controlled rolling and cooling production technology of HRB400 hot rolled ribbed steel bars | |
| CN107385328A (en) | The low-alloy super-thick steel plate with superior internal quality, low-temperature impact toughness and anti-lamellar tearing performance of two base laminating productions | |
| CN107177793A (en) | A kind of special thick structural steel and iron of the low-alloy of 610mm of thickness 400 and its manufacture method | |
| CN105689613A (en) | Special forging method suitable for super duplex stainless steel bars | |
| CN102151693B (en) | Method for rolling low-hardness small-sized spring steel | |
| CN101439365B (en) | Method for rolling seamless steel pipe from die-casting hollow steel ingot | |
| CN102059272A (en) | Method for horizontal continuous casting, Pilger rolling and continuous drawing of copper alloy condenser tube | |
| CN100408905C (en) | Manufacturing method of seamless steel pipe for pressure pipeline | |
| CN104625627B (en) | A kind of preparation method of plasma rotating electrode titanium alloy electrode rod | |
| CN109055850A (en) | Improve the preparation method of cold work die steel eutectic carbide | |
| CN110004359B (en) | High-uniformity longitudinal and transverse toughness wide steel plate and TMCP (thermal mechanical control processing) process production method thereof | |
| CN105624383A (en) | Production method capable of improving surface quality of high-strength medium-thickness plate product | |
| CN109604939B (en) | Steel billet construction method | |
| CN106540983A (en) | A kind of high solidity major diameter rod material production technology | |
| CN114074116B (en) | A controlled rolling and cooling production line for hot-rolled steel bars | |
| CN106271482A (en) | Multiple-unit homogenous metal folds the method for forging production mould steel moald-cavity | |
| CN101524706A (en) | Method for rolling low-carbon high-manganese steel continuously-cast blank in one heat | |
| CN115401156A (en) | Forging tool and forging method for semi-steel roller | |
| CN110153346A (en) | A kind of method of the forging rolling duplex technique production long material of steel alloy big cross section |
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 | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20170329 |
|
| WD01 | Invention patent application deemed withdrawn after publication |