CN106514124A - Process for prompting seaming of pore defect of continuous cast billet - Google Patents
Process for prompting seaming of pore defect of continuous cast billet Download PDFInfo
- Publication number
- CN106514124A CN106514124A CN201610877200.4A CN201610877200A CN106514124A CN 106514124 A CN106514124 A CN 106514124A CN 201610877200 A CN201610877200 A CN 201610877200A CN 106514124 A CN106514124 A CN 106514124A
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- Prior art keywords
- gas
- hole
- active metal
- billet
- continuous cast
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P6/00—Restoring or reconditioning objects
- B23P6/002—Repairing turbine components, e.g. moving or stationary blades, rotors
- B23P6/007—Repairing turbine components, e.g. moving or stationary blades, rotors using only additive methods, e.g. build-up welding
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Pressure Welding/Diffusion-Bonding (AREA)
- Metal Rolling (AREA)
Abstract
The invention relates to the technical field of production of large-section bars through continuous cast billets, in particular to a process for prompting seaming of a pore defect of a continuous cast billet. An exposed pore in the end face of the continuous cast billet is machined to form a blind hole, an active metal material is placed in the blind hole, sealed welding is carried out at the end face of the continuous cast billet through a steel plate, and the continuous cast billet is forged and rolled after being heated. Gas and the active metal are sealed in the through pore in the billet through the steel plate, and gas circulation is avoided. Since the active metal have high smelting points and boiling points, the active metal can be reacted with primary constituents, namely, O2 and N2, in the gas sealed in the billet, a formed reaction product has stable chemical properties under high temperature, no new gas is generated, the product yield can be effectively increased, and the product quality is improved remarkably.
Description
Technical field
The present invention relates to continuous casting billet production extrusion bar of large cross section technical field.
Background technology
In the continuous casting billet solidification processing of heavy in section, due to do not have rising head to the shrinkage cavity at its axis, it is loose carry out feeding, wherein
Often there is serious penetrability hole defect in heart district domain.For tackling the problems referred to above, people carry out various trials always.Mesh
Before, for the reparation of such hole defect is generally divided into two stages:Hole surface is made to reach in the presence of stress, strain first
To the state of macroscopic view contact, referred to as cave fillings stage；Closure surfaces are in uniform temperature, contact and temperature retention time afterwards
Under conditions of by diffusion, recrystallization etc. mode realize metallurgical binding, as seam stage.Closed by above method and seam
The plastic working technique of process makes surface to be closed realize physical contact, and by further lasting plastic deformation and high temperature bar
Part is greatly promoted the seam at closure interface.
However, have ignored the material impact that gas is eliminated to hole defect in the above-described techniques.Oxygen during closure in hole
Gas, is easily caused gas-solid interface at internal flaw in high-temperature heating, forging and the operation of rolling and oxidation occurs, and forms fine and close, stable
Oxide, hinder interface atoms permeating.Additionally, the pressure that gas is produced in closure hole can also suppress the receipts of hole
Contracting, hinders the laminating at interface.Ultimately result in tradition closure and seam technique is difficult to efficiently and thoroughly eliminate hole defect, formed
Gap remains, and affects effective bearing capacity of forging, becomes the defect source of part failure, have a strong impact on product mechanical property and matter
Amount.
The content of the invention
A kind of problem that the present invention is present for prior art, there is provided technique of promotion continuous casting billet hole defect seam, with
Penetrability hole in the blank that continuous casting is formed is eliminated, makes blank form good seam.
The technical scheme is that：At the hole that continuous casting billet end face exposes process to form blind hole, place in blind hole and live
Bold and vigorous metal material, then the end face in continuous casting billet adopt steel plate sealing welding, Jing after to continuous casting billet heating forged and rolled.
The principle of the invention：Gas and active metal are sealed in blank in perfoliate hole by steel plate, it is to avoid
Gas circulates.And active metal should have higher fusing point, boiling point, can be with the main component being sealed in blank in gas
O2、N2React, and the product stable chemical nature at high temperature for being formed, new gas is not produced, can be effectively improved
Product lumber recovery, significantly improves product quality.
It is an advantage of the current invention that：1st, the active metal in the present invention effectively consumes gas, reduces gas pressure intensity in hole,
Greatly promote the closure of follow-up forging operation of rolling mesopore hole defect；2nd, reduce hole defect at gas-solid interface high-temperature heating,
Oxidation in forging and the operation of rolling, is conducive to closing the proliferation welding process of defect under high temperature；3rd, substantially do not increase and produce into
This, it is simple to operate, significantly improve product quality and lumber recovery.
As the process adopted in the present invention is simple to operate, the blank and raw materials size of plurality of specifications is can be applicable to,
With great practicality.Active metal effectively consumes gas in hole simultaneously, reduces the oxidation of fault location gas-solid interface, greatly
Promote the closure of hole defect, the contact laminating of fault location gas-solid interface is reached within atomic force sphere of action, expands atom
Dissipate and be more prone to.The diffusion of interface atom makes crystal boundary that migration to occur, and crystal grain is grown through healing belt, and healing belt disappears substantially,
Seam interface tissue and matrix homogenization is made, metallurgical binding is realized, is reached raising extrusion bar of large cross section product quality and property
The purpose of energy.
In a word, during the applicable heavy in section continuous casting billet forging rolling Joint Production major diameter bar of the present invention, using active metal
The gas in continuous casting billet hole defect is consumed, is mitigated the oxidation of hole type defect gas-solid interface, and is reduced in hole type defect
Gas pressure intensity, so that promote the process of hole defect closure and seam process.
Further, active metal material of the present invention be Ca or Al at least any one.Using Ca or Al masters
Want reason to be because which has higher chemism, be easy to and O2、N2Gas produces chemical reaction and consumes these gases,
And its fusing point and boiling point are all higher（Ca for 842 DEG C of fusing point, 1484 DEG C of boiling point；Al for 660 DEG C of fusing point, boiling point 2327
℃）, itself and O2、N2The compound that reaction is produced stable chemical nature at a high temperature of 1250 °C, is not reaching to boiling point, therefore this
Two kinds of metal materials will not produce new gases affect seam effect in steel billet carries out high-temperature heating, forging and the operation of rolling.
In addition using Al with bigger serface shape and Ca such as sheet, foil-like, powdery, bandings, can fill with the gas in hole
Tap is touched, and is reached the purpose of the gas fully consumed in hole, is prevented the oxidation of gas-solid interface at hole defect, promotes hole to lack
Sunken seam.
In addition, the active metal material is shaped as flake or graininess.Using flake or granular material, can
The specific surface area of material is improved, so that active metal material even dispersion is inside blind hole, fully to consume the gas in hole,
The product of formation uniformly fills hole.
After sealing welding, heating steel billet is will heat up to 1050 DEG C～1150 DEG C, be incubated 3～15h, make microstructure homogenization,
Active metal is reacted with gas in hole in the process, is consumed gas in hole, is reduced gas pressure intensity, and reduce
The oxidation of gas-solid interface at hole defect.
Specific embodiment
Utilization active metal described further below eliminates the method for gas in hole to produce the heavy in section rod of Φ 500mm
Material, mainly eliminates gas in continuous casting billet hole using Ca bits, so as to promote to close and seam during hole defect elimination, tool
Body step is as follows：
First, select steel billet：Q345D continuous casting billet of the steel billet adopted in the present embodiment for Φ 800mm, 2.5 meters of length.Due to this
Bright employing hammer cogging, with larger compatibility, is easy to the blank using plurality of specifications.
2nd, Ca bits are added：Expose in continuous casting billet end face and process at hole blind hole, and with acetone soln by blind hole internal surface
Clean up, by the appropriate bits of the Ca with bigger serface（Or Al thin slices）It is positioned over inside blind hole to even dispersion.
This example is considered to be worth doing using Ca, and the fusing point and boiling point for being primarily due to Ca is all higher（842 DEG C of fusing point, boiling point 1484
℃）, itself and O2、N2The compound that reaction is produced also is not reaching to boiling point at a high temperature of 1250 DEG C, therefore will not produce new gas
Body affects seam effect.Concrete reaction equation is as follows：
2Ca+O2=2CaO (1)
3Ca+N2=Ca3N2 (2)
Assume inside the continuous casting billet of heavy in section, there is Φ 5mm × 2.5m holes, the gas being full of in hole is normal atmosphere pressure
Air, by can be calculated, the above-mentioned volumes of air of reactive absorption needs to consume 0.25g metal Ca.
3rd, sealing：The blind hole outer end for being put into active metal is carried out into sealing blocking with steel plate, and in the end face of contact
Argon arc welding is continuously welded by hand, realizes air seal.
4th, eliminate gas：Steel billet after welding closure is warmed up to 1050 DEG C ~ 1150 DEG C with stove heat in loading stove, insulation 3
~ 15h, makes microstructure homogenization, in the process Ca（Or Al）With gas generating polynomial in hole（1）And formula（2）The reaction, consumes
Gas in hole, reduces gas pressure intensity, and reduces the oxidation of gas-solid interface at hole defect.
5th, pull out：Blank is placed on forging press, using forging press with the pressure of Δ H=200mm/ passages
Lower amount carries out pulling operation, every time rotary billet draw out, makes blank extensional between upper and lower anvil, by forging plus
Work diagonally line length 625mm's is eight prismatic, and this operation realizes that forging ratio is about 1.5：1.
6th, pre- finish rolling：Rolled using octagonal pass on shape rolling mill, while coordinated using manipulator,
Strength rolling is carried out to above-mentioned eight prism shapes blank, i.e. 90 ° of every time double steel, roll reduction is Δ H=50mm/ roads
It is secondary, the grain size and its uniformity of fining metal.
7th, finish rolling：Finish rolling is carried out using Φ 700mm finished products circular holes on milling train, using small deformation amount Δ H=30mm/ roads
It is secondary, through 1 passes, you can the surface of finishing blank so that surface size is more accurate.
Straightener is coordinated using rollgang, the thermal straightening of steel especially long material is completed.
Through above-mentioned operation, gas in hole is significantly consumed, reduce the oxidation of fault location gas-solid interface, promote interface
The diffusion of atom, realizes the closure of hole defect until seam, greatly improves the packing of extrusion bar of large cross section product, effectively change
It has been apt to the quality of product.
Claims (4)
1. it is a kind of promote continuous casting billet hole defect seam technique, it is characterised in that：Add at the hole that continuous casting billet end face exposes
Work forms blind hole, in blind hole places active metal material, and then the end face in continuous casting billet adopts steel plate sealing welding, and Jing is to even
Forged after heating strand and rolled.
2. it is according to claim 1 promote continuous casting billet hole defect seam technique, it is characterised in that the active metal
Material be Ca or Al at least any one.
3. it is according to claim 2 promote continuous casting billet hole defect seam technique, it is characterised in that the active metal
Material is shaped as flake or graininess.
4. according to claim 1 or 2 or 3 promotion continuous casting billet hole defect seam technique, it is characterised in that sealing
After welding, heating steel billet is will heat up to 1050 DEG C～1150 DEG C, be incubated 3～15h, then forged again.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610877200.4A CN106514124A (en) | 2016-10-09 | 2016-10-09 | Process for prompting seaming of pore defect of continuous cast billet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610877200.4A CN106514124A (en) | 2016-10-09 | 2016-10-09 | Process for prompting seaming of pore defect of continuous cast billet |
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| Publication Number | Publication Date |
|---|---|
| CN106514124A true CN106514124A (en) | 2017-03-22 |
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| CN201610877200.4A Pending CN106514124A (en) | 2016-10-09 | 2016-10-09 | Process for prompting seaming of pore defect of continuous cast billet |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020151210A1 (en) * | 2019-01-22 | 2020-07-30 | 东北大学 | Shrinkage closure degree prediction calculation method in continuous casting billet reduction process |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1030040A (en) * | 1988-04-05 | 1989-01-04 | 重庆大学 | New method of amending surface defects of castings |
| CN1160618A (en) * | 1996-03-21 | 1997-10-01 | 陈友兰 | Repair method and welding wire for repairing defect on the machined plane of iron casting |
| CN1734061A (en) * | 2004-08-03 | 2006-02-15 | 株式会社东芝 | Method of repairing a stator vane of gas turbine without removing all the cracks , repaired gas turbine |
| CN101787428A (en) * | 2010-03-23 | 2010-07-28 | 扬州市为政五金冷轧有限公司 | Heat treatment method for cold-rolled steel strip |
| CN102166637A (en) * | 2010-11-26 | 2011-08-31 | 中国科学院金属研究所 | Method for eliminating central shrinkage cavities and shrinkage porosities of continuously-cast steel ingot |
| CN102211187A (en) * | 2011-05-17 | 2011-10-12 | 江苏共昌轧辊有限公司 | Method for manufacturing or repairing steel-based roller core composite roller through injection molding |
| CN102632361A (en) * | 2012-04-26 | 2012-08-15 | 重庆建设摩托车股份有限公司 | Repairing method for shrinkage blowhole of box body of motorcycle engine |
| CN104269497A (en) * | 2014-09-03 | 2015-01-07 | 深圳市华星光电技术有限公司 | Organic light-emitting diode packaging structure and display device |
| CN104259357A (en) * | 2014-10-16 | 2015-01-07 | 二重集团（德阳）重型装备股份有限公司 | Large-sized steel ingot production method |
| CN105618481A (en) * | 2016-03-15 | 2016-06-01 | 石家庄钢铁有限责任公司 | Equipment and process for conducting protruding roller rolling through continuous casting slab waste heat |
| CN105750819A (en) * | 2014-12-13 | 2016-07-13 | 重庆霸腾机械有限公司 | Repairing technique for vertical reducer body |
-
2016
- 2016-10-09 CN CN201610877200.4A patent/CN106514124A/en active Pending
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1030040A (en) * | 1988-04-05 | 1989-01-04 | 重庆大学 | New method of amending surface defects of castings |
| CN1160618A (en) * | 1996-03-21 | 1997-10-01 | 陈友兰 | Repair method and welding wire for repairing defect on the machined plane of iron casting |
| CN1734061A (en) * | 2004-08-03 | 2006-02-15 | 株式会社东芝 | Method of repairing a stator vane of gas turbine without removing all the cracks , repaired gas turbine |
| CN101787428A (en) * | 2010-03-23 | 2010-07-28 | 扬州市为政五金冷轧有限公司 | Heat treatment method for cold-rolled steel strip |
| CN102166637A (en) * | 2010-11-26 | 2011-08-31 | 中国科学院金属研究所 | Method for eliminating central shrinkage cavities and shrinkage porosities of continuously-cast steel ingot |
| CN102211187A (en) * | 2011-05-17 | 2011-10-12 | 江苏共昌轧辊有限公司 | Method for manufacturing or repairing steel-based roller core composite roller through injection molding |
| CN102632361A (en) * | 2012-04-26 | 2012-08-15 | 重庆建设摩托车股份有限公司 | Repairing method for shrinkage blowhole of box body of motorcycle engine |
| CN104269497A (en) * | 2014-09-03 | 2015-01-07 | 深圳市华星光电技术有限公司 | Organic light-emitting diode packaging structure and display device |
| CN104259357A (en) * | 2014-10-16 | 2015-01-07 | 二重集团（德阳）重型装备股份有限公司 | Large-sized steel ingot production method |
| CN105750819A (en) * | 2014-12-13 | 2016-07-13 | 重庆霸腾机械有限公司 | Repairing technique for vertical reducer body |
| CN105618481A (en) * | 2016-03-15 | 2016-06-01 | 石家庄钢铁有限责任公司 | Equipment and process for conducting protruding roller rolling through continuous casting slab waste heat |
Non-Patent Citations (1)
| Title |
|---|
| 周青峰等: "SAE1010B盘条耳状筋缺陷形成原因分析与改善", 《上海金属》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020151210A1 (en) * | 2019-01-22 | 2020-07-30 | 东北大学 | Shrinkage closure degree prediction calculation method in continuous casting billet reduction process |
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Application publication date: 20170322 |