CN104762460B - Rolling and deep-processing short-process integrated manufacturing method of high-strength steel automobile sheet - Google Patents
Rolling and deep-processing short-process integrated manufacturing method of high-strength steel automobile sheet Download PDFInfo
- Publication number
- CN104762460B CN104762460B CN201510108779.3A CN201510108779A CN104762460B CN 104762460 B CN104762460 B CN 104762460B CN 201510108779 A CN201510108779 A CN 201510108779A CN 104762460 B CN104762460 B CN 104762460B
- Authority
- CN
- China
- Prior art keywords
- punching press
- strength steel
- quenching
- temperature
- rolling
- 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.)
- Expired - Fee Related
Links
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 57
- 239000010959 steel Substances 0.000 title claims abstract description 57
- 238000005096 rolling process Methods 0.000 title claims abstract description 25
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 23
- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000012545 processing Methods 0.000 title claims abstract description 9
- 238000010791 quenching Methods 0.000 claims abstract description 71
- 230000000171 quenching effect Effects 0.000 claims abstract description 68
- 238000001816 cooling Methods 0.000 claims abstract description 26
- 239000002994 raw material Substances 0.000 claims abstract description 21
- 238000010438 heat treatment Methods 0.000 claims abstract description 18
- 230000008569 process Effects 0.000 claims abstract description 14
- 238000000465 moulding Methods 0.000 claims abstract description 7
- 229910000734 martensite Inorganic materials 0.000 claims abstract description 6
- 238000004080 punching Methods 0.000 claims description 66
- 238000005480 shot peening Methods 0.000 claims description 12
- 238000007493 shaping process Methods 0.000 claims description 8
- 238000010304 firing Methods 0.000 claims description 6
- 230000010354 integration Effects 0.000 claims description 6
- 230000009466 transformation Effects 0.000 claims description 6
- 229910001566 austenite Inorganic materials 0.000 claims description 5
- 239000013078 crystal Substances 0.000 claims description 5
- 230000000694 effects Effects 0.000 claims description 5
- 238000012856 packing Methods 0.000 claims description 5
- 238000012805 post-processing Methods 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 229910000797 Ultra-high-strength steel Inorganic materials 0.000 claims description 2
- 239000000463 material Substances 0.000 abstract description 5
- 239000000498 cooling water Substances 0.000 abstract description 4
- 238000005520 cutting process Methods 0.000 abstract description 2
- 239000002918 waste heat Substances 0.000 abstract description 2
- 238000005422 blasting Methods 0.000 abstract 1
- 230000003247 decreasing effect Effects 0.000 abstract 1
- 238000012423 maintenance Methods 0.000 abstract 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 12
- 238000005516 engineering process Methods 0.000 description 9
- 229910052742 iron Inorganic materials 0.000 description 6
- 230000008901 benefit Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000005098 hot rolling Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000006798 recombination Effects 0.000 description 1
- 238000005215 recombination Methods 0.000 description 1
- 238000005482 strain hardening Methods 0.000 description 1
Landscapes
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
A rolling and deep-processing short-process integrated manufacturing method of a high-strength steel automobile sheet includes following steps: heating raw materials in a heating furnace, performing controlled rolling including crude rolling and finish rolling, laminar cooling the rolled raw material, performing comprehensive blanking, heating the obtained sheet material, moulding and quenching the sheet material, performing a cutting process and a shot blasting process to obtain a finished product. The raw material is heated to more than 1250 DEG C in the heating furnace. A finish rolling temperature is 820 +/- 30 DEG C. The rolled sheet material is cooled to the temperature of 700 +/- 50 DEG C at a temperature decreasing rate of 10 +/- 5 DEG C/s, wherein the temperature is maintained for 2-5 min. The sheet material is heated to 880 +/- 30 DEG C at a temperature increasing rate of 15 +/- 5 DEG C/s in a continuous heating furnace with temperature maintenance for 3-5 min. The stamping and quenching member is subjected to stamping and quenching at the same time, wherein the flow velocity of cooling water in a stamping and quenching die is 50 +/- 10 DEG C/s. The stamped and quenched member is cooled to 180 +/- 50 DEG C/s to obtain a super-high strength steel part in a homogeneous martensitic structure, wherein the strength of extension can reach higher than 1500 MPa. The method can produce the high-strength steel automobile sheet at a high quality and a high efficiency, can reduce cost, can promote comprehensive utilization of secondary energy sources such as low-temperature waste heat and the like, can achieve integrated production from raw materials to the product, and can achieve energy saving, consumption reducing and environment protecting.
Description
Technical field
The invention belongs to rolling and field of deep, particularly to the rolling of a kind of high-strength steel Automobile Plate and deeply add
Work method.
Background technology
Along with being continuously increased of China's automobile sales volume, auto industry has become as the weight promoting China's economic growth
Wanting strength, the development trend of automotive light weight technology makes high-strength material application increasingly extensive.High-strength steel is the most several
Develop over Nian the most rapidly, one of the most great-hearted steel grade, due to its have higher intensity, good mould tough
Property and weldability, extensively apply in fields such as automobile makings.Owing to the forming property of high-strength steel compares ordinary steel
Plate is poor, and intensity is the highest, shapes the most difficult, easily ftractures, and resilience is serious.The quenching formed skill of punching press
Art is the cutting edge technology in stamping field, the quenching formed technology of punching press can form high strength part, under high temperature
Can eliminate the impact of resilience, formation of parts precision is high, and forming quality is good, it is possible to is widely used in automobile and protects
The important safety parts such as danger thick stick, A post, B post, C post, become what the most numerous automobile production manufacturer paid close attention to
Focus.
Rolling technique is the important step that high-strength steel Automobile Plate produces, and directly affects quality and the resultant force of product
Learn performance.Hot-rolled sheet coil common intensity is high, hardness is high, plasticity is good, cold working is relatively difficult, meanwhile, if
Taking no action to, mechanical property change is bigger than normal, brings corresponding difficulty to subsequent handling.High-strength steel vapour at present
Sweep hot rolling technology is after raw material → heating furnace → controlled rolling (roughing, finish rolling) → laminar flow cooling technology, by
The high-strength steel that band is had surplus heat by coiling machine be rolled into band volume, be transported to punching press quenching processing enterprise be processed.
The quenching formed technique of existing punching press is to be provided high-strength steel Automobile Plate by high-strength steel manufacturing enterprise, through heating
The technical processs such as → insulation → punching press quenching, are quenched to stamped for the high-strength steel of green strength about 440MPa
Shape postforming tensile strength reaches the super-high strength steel drip molding of about 1600MPa, the super-high strength steel part fortune of shaping
It is passed to various brands automobile productions enterprise.Owing to iron and steel raw material is through multiple processing, the preparation from raw material to finished product,
Expending mass energy, iron and steel enterprise can produce the complementary energy moneys such as substantial amounts of waste heat overbottom pressure in production high-strength steel Automobile Plate
Source, advances the secondary energy sources of iron and steel enterprise to recycle, in low temperature exhaust heat stage and the quenching formed technology of punching press
In conjunction with, can reach to save energy and reduce the cost, the purpose of environmental conservation, develop a kind of brand-new high-strength steel Automobile Plate and roll
System and deep processing short route Integrated-manufacturing Techniques have important practical significance and practical value.
Summary of the invention
It is an object of the invention to provide the high-strength steel Automobile Plate of a kind of low cost, efficiency height, energy-conserving and environment-protective
Rolling and deep processing short route integrated manufacturing method.The present invention mainly makes traditional hot rolling technology quench with punching press
Pyrogene shape techniqueflow reconstructs, and the high-strength steel Automobile Plate that Hot Line produces directly is carried out punching press quenching formed.
Technical scheme is as follows:
The technological process of the present invention is: raw material → heating furnace → controlled rolling (roughing, finish rolling) → section cooling →
Comprehensive blanking → heating → shaping quenches → cuts shape, shot-peening → finished product.
The present invention specifically comprises the following steps that
Being heated in heating furnace by raw material, temperature is more than 1250 DEG C, through roughing, finish rolling, last finish to gauge
Temperature is 820 ± 30 DEG C.
It is cooled to 700 ± 50 DEG C with slower 10 ± 5 DEG C/s of rate of cooling, is incubated 2～5 minutes, makes high-strength steel vapour
Sweep forms stable pearlitic structrure.
Through shear, high-strength steel Automobile Plate is cut into the geomery that punching press quenching mould needs, will cut
The plate cut is transferred to heat in continuous furnace.
In continuous furnace, it is heated to 880 ± 30 DEG C with the firing rate of 15 ± 5 DEG C/s, is incubated 3～5 minutes,
With the guarantee whole structural transformation of punching press quenching part as austenite, and crystal grain is unlikely the thickest.
Then by above-mentioned punching press quenching part by continuous furnace being transferred in punching press quenching mould, carry out simultaneously
Punching press and quenching, the rate of cooling cooling down water in punching press quenching mould is 50 ± 10 DEG C/s, is cooled to 180 ± 50 DEG C,
Drip molding can be had preferable cooling effect, it is ensured that steel plate can quickly cool down in deformation process, obtains
Obtaining the ultrahigh strength steel part at room temperature with uniform martensitic structure, after shaping, punching press quenching product is anti-
Tensile strength reaches more than 1500MPa.
The product shaped in punching press quenching mould is carried out cut and shot-peening post processing, reaches to shape
The dimensional requirement of product also eliminates the surface scale of molded part.
Through process above, it is achieved the integration production from raw material to product of the high-strength steel Automobile Plate, laser is cut
Cut with shot-peening after part carry out finished product packing, be transported to each automobile production enterprise.
The present invention compared with prior art has the advantage that
High-quality and efficient can produce, reduce cost, increase benefit, make the hot rolled production line of high-strength steel Automobile Plate
The most directly carry out punching press quenching formed, promote the comprehensive utilization of the secondary energy sources such as low temperature exhaust heat, it is achieved from raw material
To the integration production of product, reach to save energy and reduce the cost, the purpose of environmental conservation；Iron and steel enterprise can be set up simultaneously
Industry and downstream user strategic cooperation mechanism, promote iron and steel enterprise by manufacturer to the transformation of service provider, promote district
Territory iron and steel enterprise accelerates industrial upgrading, it is achieved rolling mill practice and the union and recombination of punching press quenching technology.
Accompanying drawing explanation
Fig. 1 is that the present invention rolls and deep processing Time-temperature variation diagram.
In Fig. 1: the 1-30s time period be high-strength steel Automobile Plate raw material in heating furnace, temperature is 1250 DEG C
Above；Being high-strength steel Automobile Plate roughing and finish rolling in the 30-40s time period, temperature is 820 ± 30 DEG C；At 40-220s
Time period is that high-strength steel Automobile Plate is cooled to slower 10 ± 5 DEG C/s of rate of cooling in section cooling
700 ± 50 DEG C, it is incubated 120～300s；It is that plate heats in punching press quenching heating furnace in the 220-420s time period,
It is heated to 880 ± 30 DEG C with the firing rate of 15 ± 5 DEG C/s, is incubated 180～300s, is finally that high-strength steel is at mould
In the middle punching press quenching formed stage, the rate of cooling cooling down water in punching press quenching mould is 50 ± 10 DEG C/s, cooling
To 180 ± 50 DEG C.
Detailed description of the invention
Embodiment 1
Being put into by raw material in heating furnace, heating-up temperature is 1250 DEG C, through conventional roughing, finish rolling, finally
Finishing temperature is 790 DEG C.
It is cooled to 650 DEG C with slower 5 DEG C/s of rate of cooling, is incubated 2 minutes at 650 DEG C, makes high-strength steel vapour
Sweep forms stable pearlitic structrure.
Through shear, high-strength steel Automobile Plate is cut into the geomery that punching press quenching mould needs, pass through
The plate sheared is transferred to heat in continuous furnace by high temperature puma manipulator.
In continuous furnace, it is heated to 850 DEG C with the firing rate of 10 DEG C/s, is incubated 3 minutes, to ensure punching
The pressure whole structural transformation of quenching part is austenite, and crystal grain is unlikely the thickest.Then by high temperature intelligent machine
Tool hands is quenching formed by transferring in continuous furnace to carry out punching press in punching press quenching mould by punching press quenching part.
In punching press quenching mould, punching press quenching part is carried out simultaneously punching press and quenching, in punching press quenching mould
The rate of cooling of cooling water is 40 DEG C/s, is cooled to 130 DEG C, drip molding can be had preferable cooling effect,
Ensure that steel plate can quickly cool down in deformation process.Obtain and at room temperature there is the super of uniform martensitic structure
High-duty steel part, after shaping, the tensile strength of punching press quenching product reaches more than 1520MPa.
The product shaped in punching press quenching mould is carried out cut and shot-peening post processing, reaches to shape
The dimensional requirement of product also eliminates the surface scale of molded part.
Through process above, it is achieved the integration production from raw material to product of the high-strength steel Automobile Plate, laser is cut
Cut with shot-peening after part carry out finished product packing, be transported to each automobile production enterprise.
Embodiment 2
Being put into by raw material in heating furnace, heating-up temperature is 1250 DEG C, through conventional roughing, finish rolling, finally
Finishing temperature is 820 DEG C.
It is cooled to 700 DEG C with slower 10 DEG C/s of rate of cooling, is incubated 3 minutes at 700 DEG C, makes high-strength steel vapour
Sweep forms stable pearlitic structrure.
Through shear, high-strength steel Automobile Plate is cut into the geomery that punching press quenching mould needs, pass through
The plate sheared is transferred to heat in continuous furnace by high temperature puma manipulator.
In continuous furnace, it is heated to 880 DEG C with the firing rate of 15 DEG C/s, is incubated 4 minutes, to ensure punching
The pressure whole structural transformation of quenching part is austenite, and crystal grain is unlikely the thickest.Then by high temperature intelligent machine
Tool hands is quenching formed by transferring in continuous furnace to carry out punching press in punching press quenching mould by punching press quenching part.
In punching press quenching mould, punching press quenching part is carried out simultaneously punching press and quenching, in punching press quenching mould
The rate of cooling of cooling water is 50 DEG C/s, is cooled to 180 DEG C, drip molding can be had preferable cooling effect,
Ensure that steel plate can quickly cool down in deformation process.Obtain and at room temperature there is the super of uniform martensitic structure
High-duty steel part, after shaping, the tensile strength of punching press quenching product reaches more than 1600MPa.
The product shaped in punching press quenching mould is carried out cut and shot-peening post processing, reaches to shape
The dimensional requirement of product also eliminates the surface scale of molded part.
Through process above, it is achieved the integration production from raw material to product of the high-strength steel Automobile Plate, laser is cut
Cut with shot-peening after part carry out finished product packing, be transported to each automobile production enterprise.
Embodiment 3
Being put into by raw material in heating furnace, heating-up temperature is 1250 DEG C, through conventional roughing, finish rolling, finally
Finishing temperature is 850 DEG C.
It is cooled to 750 DEG C with slower 15 DEG C/s of rate of cooling, is incubated 5 minutes at 750 DEG C, makes high-strength steel vapour
Sweep forms stable pearlitic structrure.
Through shear, high-strength steel Automobile Plate is cut into the geomery that punching press quenching mould needs, pass through
The plate sheared is transferred to heat in continuous furnace by high temperature puma manipulator.
In continuous furnace, it is heated to 910 DEG C with the firing rate of 20 DEG C/s, is incubated 5 minutes, to ensure punching
The pressure whole structural transformation of quenching part is austenite, and crystal grain is unlikely the thickest.Then by high temperature intelligent machine
Tool hands is quenching formed by transferring in continuous furnace to carry out punching press in punching press quenching mould by punching press quenching part.
In punching press quenching mould, punching press quenching part is carried out simultaneously punching press and quenching, in punching press quenching mould
The rate of cooling of cooling water is 60 DEG C/s, is cooled to 230 DEG C, drip molding can be had preferable cooling effect,
Ensure that steel plate can quickly cool down in deformation process.Obtain and at room temperature there is the super of uniform martensitic structure
High-duty steel part, after shaping, the tensile strength of punching press quenching product reaches more than 1550MPa.
The part shaped in punching press quenching mould is carried out cut and shot-peening post processing, makes punching press quench
Fire part reaches the dimensional requirement of molded part and eliminates the surface scale of molded part.
Through process above, it is achieved the integration production from raw material to product of the high-strength steel Automobile Plate, laser is cut
Cut with shot-peening after part carry out finished product packing, be transported to each automobile production enterprise.
Claims (1)
1. the rolling of a high-strength steel Automobile Plate and deep processing short route integrated manufacturing method, it is characterized in that: its technological process is: raw material → heating furnace → controlled rolling, quench → cut shape, shot-peening → finished product including roughing and finish rolling → section cooling → comprehensive blanking → heating → shaping；
It specifically comprises the following steps that
(1) being heated in heating furnace by raw material, temperature is more than 1250 DEG C, and through conventional roughing, finish rolling, last finishing temperature is 820 ± 30 DEG C；
(2) it is cooled to 700 ± 50 DEG C with slower 10 ± 5 DEG C/s of rate of cooling, is incubated 2～5 minutes, makes high-strength steel Automobile Plate form stable pearlitic structrure；
(3) through shear, high-strength steel Automobile Plate is cut into the geomery that punching press quenching mould needs, transfer to continuous furnace heats by the plate sheared;
(4) in continuous furnace, it is heated to 880 ± 30 DEG C with the firing rate of 15 ± 5 DEG C/s, it is incubated 3～5 minutes, to ensure that the whole structural transformation of punching press quenching part is as austenite, and crystal grain is unlikely the thickest, then that above-mentioned punching press quenching part is quenching formed by transferring in continuous furnace to carry out punching press in punching press quenching mould；
(5) in punching press quenching mould, punching press quenching part is carried out simultaneously punching press and quenching, the rate of cooling cooling down water in punching press quenching mould is 50 ± 10 DEG C/s, it is cooled to 180 ± 50 DEG C, drip molding can be had preferable cooling effect, ensureing that steel plate can quickly cool down in deformation process, it is thus achieved that at room temperature have the ultrahigh strength steel part of uniform martensitic structure, after shaping, the tensile strength of punching press quenching product reaches more than 1500MPa；
(6) product shaped in punching press quenching mould is carried out cut and shot-peening post processing, reach the dimensional requirement of molded part and eliminate the surface scale of molded part；
(7) through process above, it is achieved the integration production from raw material to product of the high-strength steel Automobile Plate, the part after cut and shot-peening is carried out finished product packing, is transported to each automobile production enterprise.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510108779.3A CN104762460B (en) | 2015-03-12 | 2015-03-12 | Rolling and deep-processing short-process integrated manufacturing method of high-strength steel automobile sheet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510108779.3A CN104762460B (en) | 2015-03-12 | 2015-03-12 | Rolling and deep-processing short-process integrated manufacturing method of high-strength steel automobile sheet |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104762460A CN104762460A (en) | 2015-07-08 |
| CN104762460B true CN104762460B (en) | 2017-01-11 |
Family
ID=53644548
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510108779.3A Expired - Fee Related CN104762460B (en) | 2015-03-12 | 2015-03-12 | Rolling and deep-processing short-process integrated manufacturing method of high-strength steel automobile sheet |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104762460B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107928728A (en) * | 2018-01-09 | 2018-04-20 | 李庆杰 | A kind of surgical dilator expansion part |
| CN109433825B (en) * | 2018-11-13 | 2020-03-31 | 燕山大学 | Method for manufacturing high-strength steel plate in short process, high-strength steel plate and application of high-strength steel plate |
| CN109985904A (en) * | 2019-04-30 | 2019-07-09 | 中冶赛迪技术研究中心有限公司 | A kind of method and system of continuous casting and rolling production thermoforming steel |
| CN113926892B (en) * | 2020-06-29 | 2024-07-12 | 宝山钢铁股份有限公司 | Stamping forming process and application of hot-rolled ultra-high strength dual-phase steel part with tensile strength of more than or equal to 980MPa |
| CN111872149B (en) * | 2020-07-15 | 2021-02-09 | 燕山大学 | ESP-based dynamic variable rule slab performance gradient distribution forming method |
Family Cites Families (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4951997B2 (en) * | 2005-03-28 | 2012-06-13 | Ｊｆｅスチール株式会社 | A method for producing a high-tensile steel sheet having a tensile strength of 550 MPa or more. |
| CN100571971C (en) * | 2008-06-25 | 2009-12-23 | 钢铁研究总院 | A kind of hot rolled steel plate for punch process and preparation method thereof |
| JP5418047B2 (en) * | 2008-09-10 | 2014-02-19 | Ｊｆｅスチール株式会社 | High strength steel plate and manufacturing method thereof |
| CN102031455A (en) * | 2009-09-30 | 2011-04-27 | 鞍钢股份有限公司 | Steel sheet for press quenching and method for producing same |
| CN102031456B (en) * | 2009-09-30 | 2013-07-03 | 鞍钢股份有限公司 | Steel sheet for press hardening and method of hot forming the same |
| CN102199732B (en) * | 2010-03-25 | 2013-04-24 | 宝山钢铁股份有限公司 | Boron containing steel plate for heat treatment and manufacturing method thereof |
| KR101829854B1 (en) * | 2011-04-01 | 2018-02-20 | 신닛테츠스미킨 카부시키카이샤 | Hot stamp-molded high-strength component having excellent corrosion resistance after coating, and method for manufacturing same |
| CN102181795B (en) * | 2011-05-16 | 2013-01-09 | 马鸣图 | Superhigh-strength armour plate and manufacturing process thereof |
| MX2014008430A (en) * | 2012-01-13 | 2014-10-06 | Nippon Steel & Sumitomo Metal Corp | Hot stamp molded article, and method for producing hot stamp molded article. |
| CN103212950A (en) * | 2013-04-24 | 2013-07-24 | 大连理工大学 | Technique of improving toughening and formability of automotive AHSS hot-stamping structural component |
| CN103320702B (en) * | 2013-06-26 | 2016-01-20 | 武汉钢铁(集团)公司 | A kind of tensile strength 1700MPa level thermoforming steel and production method thereof |
| CN103320700B (en) * | 2013-06-26 | 2015-10-14 | 武汉钢铁(集团)公司 | A kind of 1500MPa level car safety part steel and production method thereof |
| CN103614640B (en) * | 2013-12-12 | 2016-10-05 | 马鸣图 | A kind of non-coating hot press-formed steel of resistance to high temperature oxidation |
| CN104195443A (en) * | 2014-05-19 | 2014-12-10 | 首钢总公司 | High-flexural-behavior hot-formed steel used for automobiles and manufacturing method thereof |
-
2015
- 2015-03-12 CN CN201510108779.3A patent/CN104762460B/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN104762460A (en) | 2015-07-08 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104762460B (en) | Rolling and deep-processing short-process integrated manufacturing method of high-strength steel automobile sheet | |
| CN104313281B (en) | A kind of production technology of high Oxygen potential fastener wire | |
| WO2013047526A1 (en) | Method for manufacturing press-molded article and press molding equipment | |
| CN105108457B (en) | The processing method of overall driven disc | |
| CN101209456B (en) | Production method of high-strength medium-thickness steel plate | |
| CN110918642A (en) | Production control method for improving bending degree of 42CrMo bar | |
| CN104759469B (en) | Exempt from the production method of annealing medium carbon cold heading steel hot rolling wire | |
| CN102581145A (en) | Method for manufacturing high-hardness and high-abrasion-resistant pre-bending machine lower die | |
| WO2008139639A1 (en) | Bend pipe and process for manufacturing the same | |
| CN106987773A (en) | A kind of high strength steel plate and its board-shape control method | |
| CN106391805B (en) | The indirect drop stamping variable speed figuration method of steel plate | |
| CN103255277A (en) | Method for producing wide and thin IF steel by continuous annealing | |
| CN104209320A (en) | Cold rolling method for stainless steel band | |
| CN104550234A (en) | Rolling method of pipeline steel and stainless steel composite plate | |
| CN104550391A (en) | Hot stamping forming process used in integrated segmented cooling and carbon distribution process | |
| CN104476145B (en) | The manufacture method of pad | |
| CN105239001B (en) | Cold-rolled steel sheet for oil heater and preparation method thereof | |
| CN109433825A (en) | The method and high-strength steel sheet of a kind of short route production high-strength steel sheet and its application | |
| CN101767106A (en) | Hot rolling process of stainless plate strip coil | |
| CN102248370B (en) | Method for producing precise linear guide slide seat for machining center | |
| CN101886220B (en) | Hot continuous rolling steel plate for cold forming and production method thereof | |
| CN104014594A (en) | Method for overcoming post-cold-shearing lateral bending of gear steel bar | |
| CN110252804A (en) | The production method of hot continuous rolling production thin gauge ultra-low-carbon steel | |
| CN110153199A (en) | A kind of controlled rolling method of large scale rod bar | |
| CN101773973A (en) | Forming method of straight toothed spur gear compound forge with weight of 1-3 kilos, large diameter and large modulus |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| EXSB | Decision made by sipo to initiate substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170111 |