CS206302B1 - Method of the heat treating of electrotrosc overlays - Google Patents
Method of the heat treating of electrotrosc overlays Download PDFInfo
- Publication number
- CS206302B1 CS206302B1 CS703479A CS703479A CS206302B1 CS 206302 B1 CS206302 B1 CS 206302B1 CS 703479 A CS703479 A CS 703479A CS 703479 A CS703479 A CS 703479A CS 206302 B1 CS206302 B1 CS 206302B1
- Authority
- CS
- Czechoslovakia
- Prior art keywords
- heat treatment
- electroslag
- temperature
- deposit
- welded
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims description 10
- 238000010438 heat treatment Methods 0.000 claims description 13
- 238000003466 welding Methods 0.000 claims description 8
- 238000000137 annealing Methods 0.000 claims description 7
- 238000001816 cooling Methods 0.000 claims description 6
- 239000002184 metal Substances 0.000 claims description 6
- 229910052751 metal Inorganic materials 0.000 claims description 6
- 239000011810 insulating material Substances 0.000 claims description 5
- 239000010425 asbestos Substances 0.000 claims description 3
- 229910052895 riebeckite Inorganic materials 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 2
- 238000005253 cladding Methods 0.000 description 2
- 238000007669 thermal treatment Methods 0.000 description 2
- 229910001315 Tool steel Inorganic materials 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 210000002268 wool Anatomy 0.000 description 1
Landscapes
- Heat Treatment Of Articles (AREA)
Description
(54) Spósob tepelného spracovania elektrotroskových návarov(54) Method of thermal treatment of electroslag deposits
Vynález sa týká spósobu tepelného spracovania elektrotroskových návarov.The present invention relates to a method of heat treatment of electroslag deposits.
Pri elektrotroskových návaroch kovových telies, například valcov válcovacích stolíc, sa používajú návarové kovy, ktoré je nutné po navaření tepelne spracovať. Tepelným spracováním návarov sa získá jeho vyššia tvrdost ako i odpnutie. Vo vel’kej miere k naváraniu valcov sa používajú materiály nástrojových ocelí, ktorých tepelné spracovanie je zvlášť velmi výhodné. Ide o takzvané popúšťacie žíhanie pri teplotách 500 až 600 °C. Doteraz pri tepelnom spracovaní navařených kovových telies, najma valcov, postupovalo sa tak, že v případe, ak nebola k dispozícii žíhacia pec, válec sa nechal volné vychladnúť, alebo ihned’ po navaření bol daný do pece vyhriatej na žíhaciu teplotu a tepelne sa spracoval. V oboch prípadoch tento postup zapříčiňoval lokálny pokles tvrdosti návaru tepelne spracovaného elektrotroskového naváraného valca. Pokles tvrdosti návaru bol v každom případe asi v 3/5 dlžky těla navařeného valca smerom k hornému čapu, to je ku konců návaru. Tento pokles tvrdosti zapříčiňoval vyradenie elektrotroskove navařených valcov, alebo si vyžiadal zopakovat kalenie pri teplotě cca 900 °C. Z hl’adiska ekonomie takýto postup zvyšuje náklady na elektrotroskove navařené válce tak, že táto technológia přestává byť efektívna. Pri rozbore příčin poklesu tvrdosti sa zistilo, že pokles tvrdosti spósobuje naakumulovaná tepelná energia z navárania a táto lokálně popustí návar a tým znehodnotí celý navařený válec. Vytvrdzovacie žíhanie týchto návarov prebieha pri teplote 500 až 600 °C.Electroslag welds on metal bodies, such as rolling mill rollers, use weld metals which need to be heat treated after welding. The heat treatment of the cladding results in a higher hardness than a breakdown. Tool steel materials are used to a large extent for the welding of rollers, the heat treatment of which is particularly advantageous. This is the so-called annealing annealing at temperatures of 500 to 600 ° C. Up to now, the heat treatment of the welded metal bodies, in particular the cylinders, has been carried out so that, in the absence of an annealing furnace, the cylinder is allowed to cool freely, or immediately after welding. In both cases, this process caused a local decrease in the hardness of the weld deposit of the heat treated electroslag welded roller. The decrease in hardness of the weld deposit was in each case about 3/5 of the length of the welded cylinder body towards the upper stud, that is to the ends of the weld deposit. This decrease in hardness caused the elimination of electroslag welded rollers, or required the hardening to be repeated at a temperature of about 900 ° C. From an economic point of view, such an approach increases the cost of electroslag welded rollers so that the technology ceases to be effective. When analyzing the causes of the hardness drop, it has been found that the hardness drop is caused by the accumulated thermal energy from the surfacing, and this locally releases the surfacing and thereby destroys the entire welded roll. The hardening annealing of these deposits is carried out at a temperature of 500 to 600 ° C.
Vyššie uvedené nedostatky sa do značnej miery odstraňujú spósobom tepelného spracovania elektrotroskových návarov podřa vynálezu, ktorého podstata spočívá v tom, že po navaření sleduje sa teplota chladnúceho povrchu návaru a pri doeiahnutí žíhacej teploty naváraného materiálu sa stabilizuje obalením naváraného kovového telesa tepelne izolačným materiálom ako je například azbest, čadič, ktorého hrúbka je daná závislosťou na čase a teplote potrebnej na tepelné spracovanie návaru.The aforementioned drawbacks are largely eliminated by the heat treatment of the electroslag weld deposit according to the invention, which is based on the fact that after welding the temperature of the weld deposit cooling surface is monitored and stabilized by wrapping the welded metal body with a thermally insulating material. asbestos, basalt, the thickness of which is given by the time and temperature required for heat treatment of the deposit.
Riadením ochladzovania v priebehu navárania a po· naváraní najma stabilizáciou teploty tepelne izolačným materiálom sa stabilizuje teplota žíhania a ďalej sa využije naakumulovaná tepelná energia k tepelnému spracovaniu návaru. Tento spósob podl’a vynálezu zabezpečuje rovnomernosť tepelného spracovania po celej dlžke návaru a tým aj jeho rovnakú tvrdosť. Tento spósob je výhodný aj z hladiska šetrenia energie a celkove znižuje cenu elektrotroskových návarov. Re206302 gulovaním ochladzovania elektrotroskovo naváraných návarov zabráni sa lokálnemu poklesu tvrdosti návaru.By controlling the cooling during welding and after welding, in particular by stabilizing the temperature with the heat insulating material, the annealing temperature is stabilized and the accumulated thermal energy is further utilized for the thermal treatment of the deposit. This method according to the invention ensures uniformity of heat treatment over the entire length of the weld deposit and hence its equal hardness. This method is also advantageous in terms of energy saving and overall reduces the cost of electroslag cladding. Re206302 by gouging the cooling of the electroslag welded overlays will prevent the local hardness of the overlay.
Spósob podlá vynálezu je bližšie vysvětlený na příklade tepelného spracovania elektrotroskove navařeného valca o priemere 700 mm. Pri navárani valca elektrotroskovým spósobom sa od začiatku navárania, ako dolná hrana kryštalizátora odokryje návar, sleduje teplota chladnúceho povrchu návaru pomocou indikačných zariadení. Keď chladnúci návar dosiahne teplotu žíhaniá, tento' sa zabalí tepelne izolačným materiálom ako je azbest, čadič a podobné. Hrúbka izolačného materiálu sa volí v závislosti na čase a teplote potrebnom na tepelné spracovanie návaru. Meraním bolo zistené, že zábal pozostávajúci z čadičovej vaty udrží teplotu 500 °C až 10 hodin, čo potvrdzuje, že dokáže lokálně udržať teplotu do 600 °C, na čas potřebný na tepelné spracovanie návaru.The process according to the invention is explained in more detail by way of example by heat treatment of an electroslag welded cylinder having a diameter of 700 mm. When welding the roll by the electroslag method, the temperature of the cooling surface of the surfacing is monitored by means of indicating devices as the lower edge of the crystallizer exposes the surfacing from the beginning of the surfacing. When the cooling deposit reaches the annealing temperature, it is wrapped with a heat insulating material such as asbestos, basalt and the like. The thickness of the insulating material is selected depending on the time and temperature required for the heat treatment of the surfacing. Measurements have shown that the basalt wool wrap will maintain a temperature of 500 ° C for up to 10 hours, confirming that it can locally maintain a temperature of up to 600 ° C for the time required for heat treatment of the deposit.
Spósob tepelného spracovania elektrotroskových návarov je vhodný najma pre válce váčších priemerov, ako aj pre iné elektrotroskové navárané kovové telesá, hlavně tie, u ktorých sa vyžaduje rovnoměrná tvrdost po celom povrchu návaru.The method of heat treatment of electroslag deposits is particularly suitable for cylinders of larger diameters, as well as for other electroslag deposited metal bodies, especially those that require uniform hardness across the surface of the deposit.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CS703479A CS206302B1 (en) | 1979-10-17 | 1979-10-17 | Method of the heat treating of electrotrosc overlays |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CS703479A CS206302B1 (en) | 1979-10-17 | 1979-10-17 | Method of the heat treating of electrotrosc overlays |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CS206302B1 true CS206302B1 (en) | 1981-06-30 |
Family
ID=5418696
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CS703479A CS206302B1 (en) | 1979-10-17 | 1979-10-17 | Method of the heat treating of electrotrosc overlays |
Country Status (1)
| Country | Link |
|---|---|
| CS (1) | CS206302B1 (en) |
-
1979
- 1979-10-17 CS CS703479A patent/CS206302B1/en unknown
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