NO782125L - PROCEDURE FOR MANUFACTURE OF HOT-ROLLED BAR STEEL - Google Patents
PROCEDURE FOR MANUFACTURE OF HOT-ROLLED BAR STEELInfo
- Publication number
- NO782125L NO782125L NO782125A NO782125A NO782125L NO 782125 L NO782125 L NO 782125L NO 782125 A NO782125 A NO 782125A NO 782125 A NO782125 A NO 782125A NO 782125 L NO782125 L NO 782125L
- Authority
- NO
- Norway
- Prior art keywords
- steel
- rod
- bar
- temperature
- bar steel
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims description 32
- 238000004519 manufacturing process Methods 0.000 title claims description 9
- 229910000831 Steel Inorganic materials 0.000 claims description 63
- 239000010959 steel Substances 0.000 claims description 63
- 238000001816 cooling Methods 0.000 claims description 19
- 238000005096 rolling process Methods 0.000 claims description 15
- 239000004744 fabric Substances 0.000 claims description 13
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 10
- 229910052799 carbon Inorganic materials 0.000 claims description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 10
- 238000005098 hot rolling Methods 0.000 claims description 6
- 229910001563 bainite Inorganic materials 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 claims description 4
- 229910000734 martensite Inorganic materials 0.000 claims description 4
- 229910000617 Mangalloy Inorganic materials 0.000 claims description 3
- QFGIVKNKFPCKAW-UHFFFAOYSA-N [Mn].[C] Chemical compound [Mn].[C] QFGIVKNKFPCKAW-UHFFFAOYSA-N 0.000 claims description 3
- 230000003014 reinforcing effect Effects 0.000 claims description 3
- 238000003466 welding Methods 0.000 claims description 3
- 238000010276 construction Methods 0.000 claims description 2
- 239000010410 layer Substances 0.000 claims description 2
- 239000002344 surface layer Substances 0.000 claims description 2
- 238000005520 cutting process Methods 0.000 claims 1
- 238000007373 indentation Methods 0.000 claims 1
- 230000009466 transformation Effects 0.000 description 3
- 238000010622 cold drawing Methods 0.000 description 2
- 229910000639 Spring steel Inorganic materials 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910001562 pearlite Inorganic materials 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Classifications
-
- 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
- C21D8/08—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires for concrete reinforcement
-
- 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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
- C21D9/525—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length for wire, for rods
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Heat Treatment Of Steel (AREA)
- Metal Rolling (AREA)
Description
Fremgangsmåte for frem-Procedure for advancing
stilling av varmvalsetposition of the hot roller
stangstål.bar steel.
Denne oppfinnelse angår fremstilling av stangstål. This invention relates to the production of rod steel.
Spesielt angår den fremstilling av høyfast stangstål i kveilform. In particular, it concerns the production of high-strength bar steel in coil form.
Det er tidligere kjent å herde stangstål ved bråkjøling i vann idet stålet forlater siste valsepar i et kontinuerlig stang-valseverk, og deretter legge stangstålet overlappende på en åpen, kontinuerlig transportør, samt å utsette det for avkjøling i en It is previously known to harden bar steel by quenching in water as the steel leaves the last pair of rolls in a continuous bar-rolling mill, and then lay the bar steel overlapping on an open, continuous conveyor, as well as subjecting it to cooling in a
luftstrøm idet det passerer langs transportøren. Stangstålet formes deretter til en kveil idet det forlater transportøren. Denne prosess kalles vanligvis "Stelmor"-styrt kjølesystem, og har som i vesentlig formål å fremstille stangstål med mikrostrukturer av airflow as it passes along the conveyor. The bar steel is then formed into a coil as it leaves the conveyor. This process is usually called the "Stelmor"-controlled cooling system, and essentially has the purpose of producing bar steel with microstructures of
ferritt og perlitt. For å frembringe stangstål med slik mikro-struktur avlegges stangstålet på den bevegelige transportør ved en temperatur som ligger over den temperatur ved hvilken allotro-pisk omdanning av austenitten i stangstålet begynner å skje. ferrite and pearlite. In order to produce bar steel with such a micro-structure, the bar steel is deposited on the moving conveyor at a temperature that is above the temperature at which allotropic transformation of the austenite in the bar steel begins to occur.
Foreliggende oppfinnelse tilveiebringer en fremgangsmåte for fremstilling av varmvalset stangstål innbefattende varmvalsing av stålet i et kontinuerlig valseverk, idet stangstålet kommer ut av det siste valsepar i valseverket med en temperatur som er høyere enn,1000°C, kunstig avkjøling av stangstålet i vann fra en temperatur over 1000°C til en utligningstemperatur mellom 300°C og 700°C, og deretter avkjøling av stangstålet i luft. The present invention provides a method for the production of hot-rolled bar steel including hot rolling of the steel in a continuous rolling mill, the bar steel coming out of the last pair of rolls in the rolling mill with a temperature higher than 1000°C, artificial cooling of the bar steel in water from a temperature above 1000°C to an equalization temperature between 300°C and 700°C, and then cooling the bar steel in air.
Umiddelbart.etter vannkjølingen kan stangstålet legges på en transportør slik at stangstålet danner flate, overlappende, ikke-konsentriske ringer som avkjøles i luft idet de passerer langs transportøren. Ringene kan samles ved enden av tran-sportøren for å danne kveiler. Immediately after the water cooling, the bar steel can be placed on a conveyor so that the bar steel forms flat, overlapping, non-concentric rings which are cooled in air as they pass along the conveyor. The rings can be gathered at the end of the conveyor to form coils.
Avkjølingen på transportøren kan utføres i stort sett stillestående luft. Alternativt kan man anvende en viss grad av forsterket luftstrømkjøling, for å muliggjøre påfølgende, til-fredsstillende håndtering av kveilen. The cooling of the conveyor can be carried out in mostly still air. Alternatively, a certain degree of enhanced airflow cooling can be used to enable subsequent, satisfactory handling of the coil.
Stangstålet kan bestå av karbon-manganstål med et kar boninnhold på mellom 0,05 % og 1,00 %. Stålet kan fremstilles i en balansert (halvtettet) eller tettet form, selv om hensikts-messig utettet stål også kan anvendes. The rod steel can consist of carbon-manganese steel with a carbon content of between 0.05% and 1.00%. The steel can be produced in a balanced (semi-sealed) or sealed form, although suitable unsealed steel can also be used.
Stangstålet blir fortrinnsvis avkjølet i vann til en utligningstemperatur på mellom 400°C og 700°C, selv om stål ved nedre ende av karbonområdet kan kreve en utligningstemperatur på mellom 300° og 400°C. The bar steel is preferably cooled in water to an equalization temperature of between 400°C and 700°C, although steel at the lower end of the carbon range may require an equalization temperature of between 300° and 400°C.
De.ikke-konsentriske ringene kan omformes til kveiler ved en temperatur som er minst 10 0°C lavere enn den temperatur ved hvilken de legges. The non-concentric rings can be converted into coils at a temperature at least 100°C lower than the temperature at which they are laid.
Fremgangsmåten kan innbefatte utforming av ribber eller innhakk på stangstålet i valseprosessen før avkjøling. Det avkjølte stangstål kan deretter kaldtrekkes til ståltråd uten forutgående varmebehandling. The process may include forming ribs or notches on the bar steel in the rolling process before cooling. The cooled bar steel can then be cold drawn into steel wire without prior heat treatment.
Ifølge et annet aspekt ved oppfinnelsen tilveiebrin-ges en fremgangsmåte for fremstilling av sveiset stålduk for armering av betong innbefattende varmvalsing av stålet i et valseverk, idet stangstålet kommer ut av siste valsepar i valseverket med en temperatur høyere ennl000°C, kunstig avkjøling av stangstålet i vann fra en temperatur på over 1000°C til en utligningstemperatur på mellom 300°C og 700°C for dannelse av et ytre overflatelag av martensitt eller bainitt, avkjøling av stangstålet i luft for herding av martensitt- eller bainittlaget og uten ytterligere trekking eller mekanisk bearbeiding, arrangering av stangen i form av en gitterduk, og sveising av stanglengdene til hverandre der stengene overlappes. According to another aspect of the invention, a method is provided for the production of welded steel fabric for reinforcing concrete including hot rolling of the steel in a rolling mill, the bar steel coming out of the last pair of rollers in the rolling mill with a temperature higher than 1000°C, artificial cooling of the bar steel in water from a temperature above 1000°C to an equalization temperature of between 300°C and 700°C to form an outer surface layer of martensite or bainite, cooling the bar steel in air to harden the martensite or bainite layer and without further drawing or mechanical processing, arranging the rod in the form of a lattice cloth, and welding the rod lengths to each other where the rods overlap.
Stangstålet fremstilt ved fremgangsmåten ifølge oven-stående avsnitt kan kuttes i passende lengder før de formes til gitterduken. Alternativt kan stangen ved hjelp av automatiske gitterdukformende maskiner fremføres fra enkeltkveiler og bringes i stilling for dannelse av en gitterduk sveiset ved overlappnin-gene, og deretter kuttes nær hver kveil for å frigjøre den ferdig formede gitterduk. The bar steel produced by the method according to the above section can be cut into suitable lengths before they are formed into the grid cloth. Alternatively, the rod can be advanced by means of automatic grid fabric forming machines from individual coils and brought into position to form a grid fabric welded at the overlaps, and then cut close to each coil to release the finished grid fabric.
Fremgangsmåten kan innbefatte utforming av fremspring på stangoverflaten under valseprosessen. Stangen kan være rettet ut før den kuttes til passende lengder for påfølgende konstruksjon av gitterduk. The method may include forming protrusions on the bar surface during the rolling process. The rod can be straightened before it is cut to suitable lengths for subsequent construction of lattice fabric.
Et sett eksempler på stål som er behandlet ifølge oppfinnelsen og de derav følgende egenskaper til det således fremstilte stangstål er angitt i følgende tabell. Stangdiameterene lå mellom 5,5 m og 9,5 m. A set of examples of steel that has been treated according to the invention and the resulting properties of the rod steel produced in this way are indicated in the following table. The rod diameters were between 5.5 m and 9.5 m.
I hvert av eksemplene vil en se at stangen er avkjølt til under dens omvandlingstemperatur før leggingen påbegynnes. Sluttvalsetemperaturen i hvert eksempel var tilnærmet 1050°C. In each of the examples, it will be seen that the bar is cooled below its transformation temperature before laying is started. The final rolling temperature in each example was approximately 1050°C.
Egenskapene til materialet som fremstilles ved denne fremgangsmåte er meget fordelaktige sammenlignet med lignende stål som er behandlet i henhold til det "Stelmor"-styrte kjøle-system. For eksempel ville stålet vist i eksempel 1 dersom det var behandlet i "Stelmor"-prosessen normalt ha en strekkfasthet på ca. 485 N/mm 2 og en flytegrense på ca. 375 N/mm 2. Stålet i eksempel 4 ville ved behandling i henhold til den vanlige"Stelmor"-prosess ha en strekkfasthet på ca. 920 N/mm 2 og en 0,2-grense på The properties of the material produced by this method are very advantageous compared to similar steels treated according to the "Stelmor" controlled cooling system. For example, the steel shown in example 1, if it had been treated in the "Stelmor" process, would normally have a tensile strength of approx. 485 N/mm 2 and a yield strength of approx. 375 N/mm 2. The steel in example 4 would have a tensile strength of approx. 920 N/mm 2 and a 0.2 limit of
2 2
545 N/mm .545 N/mm.
Stangstål som er fremstilt ifølge oppfinnelsen lar seg kaldtrekke uten ytterligere varmebehandling for . fremstilling av ståltråd med stor fasthet. Alternativt kan konvensjonell trådfasthet oppnås ved mindre trekking enn det som kreves med Bar steel manufactured according to the invention can be cold drawn without further heat treatment for . production of high-strength steel wire. Alternatively, conventional thread strength can be achieved with less pulling than required
konvensjonell stang, hvorved man oppnår vesentlig kostnadsreduk-i sjon til kunden. Ved de nedre karbonverdier kan høyfast gjerde-tråd og rep fremstilles billigere, og ved de høyere karbonnivåer, f.eks. over 0,50 % karbon, kan fjærståltråd fremstilles meget øko- conventional rod, whereby a significant cost reduction is achieved for the customer. At the lower carbon values, high-strength fence wire and rope can be produced more cheaply, and at the higher carbon levels, e.g. above 0.50% carbon, spring steel wire can be produced very eco-
nomisk. Stangstålet er meget duktilt med typiske forlengelses-verdier på 17 til 21 % hvilket gjør det mulig å utføre en for-holdsvis høy grad av koldstrekking uten behov for varmebehandling . nomic. The bar steel is very ductile with typical elongation values of 17 to 21%, which makes it possible to carry out a relatively high degree of cold drawing without the need for heat treatment.
Typiske eksempler på stål som er behandlet ifølge oppfinnelsen og formet til gitterduk, samt de resulterende egenskaper ved det således fremstilte stangstål, fremgår av følgende tabell. Typical examples of steel that has been treated according to the invention and formed into grid cloth, as well as the resulting properties of the rod steel produced in this way, appear in the following table.
I hvert av eksemplene i det siste eksempelsett vil man se at stangen avkjøles til under omvandlingstemperaturen før legging påbegynnes. Det skal bemerkes at ved den anvendte valseverkutforming tilsvarer leggetemperaturen omtrent stangens utligningstemperatur. Sluttvalsetemperaturen i hvert eksempel var ca. 1050°C. In each of the examples in the last set of examples, you will see that the rod is cooled to below the transformation temperature before laying begins. It should be noted that with the rolling mill design used, the laying temperature roughly corresponds to the bar's compensation temperature. The final rolling temperature in each example was approx. 1050°C.
En har funnet at disse stenger kan rettes ut og kuttes i lengder og benyttes direkte for fremstilling av gitterduk for betongarmering uten kaldtrekking eller ytterligere mekanisk bearbeiding. Der synes ikke å være noe problem forbundet med sveising av gitterduken, og fasthetsnivåene er minst så gode som konvensjonelt produsert koldtrukket stangstål eller tråd som er blitt brukt for armeringsduker. Med 8 mm diameter stangstål inneholdende 0,24 % karbon og 0,56 mangan, lagt ved 700°C, anty-der strekkprøver at bruddstillingen er bort fra sveiseområdet, idet strekkstyrken er 740 N/mm 2 , 0,2-grensen er 600 N/mm 2 og med en forlengelse på 19 %. It has been found that these rods can be straightened and cut into lengths and used directly for the production of grid cloth for concrete reinforcement without cold drawing or further mechanical processing. There appears to be no problem associated with welding the mesh, and the strength levels are at least as good as conventionally produced cold drawn bar steel or wire that has been used for reinforcing mesh. With 8 mm diameter bar steel containing 0.24% carbon and 0.56 manganese, laid at 700°C, tensile tests suggest that the fracture position is away from the weld area, as the tensile strength is 740 N/mm 2 , the 0.2 limit is 600 N/mm 2 and with an elongation of 19%.
Claims (22)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB25695/77A GB1576944A (en) | 1977-06-20 | 1977-06-20 | Production of steeel rod or bar |
GB45765/77A GB1587215A (en) | 1977-11-03 | 1977-11-03 | Manufacture of welded steel mesh |
Publications (1)
Publication Number | Publication Date |
---|---|
NO782125L true NO782125L (en) | 1978-12-21 |
Family
ID=26257817
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
NO782125A NO782125L (en) | 1977-06-20 | 1978-06-19 | PROCEDURE FOR MANUFACTURE OF HOT-ROLLED BAR STEEL |
Country Status (8)
Country | Link |
---|---|
AT (1) | ATA446678A (en) |
DE (1) | DE2826826A1 (en) |
ES (1) | ES470858A1 (en) |
FR (1) | FR2395084A1 (en) |
LU (1) | LU79840A1 (en) |
NL (1) | NL7806613A (en) |
NO (1) | NO782125L (en) |
SE (1) | SE7806987L (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2569424B3 (en) * | 1984-08-23 | 1986-09-05 | Siderurgie Fse Inst Rech | METHOD OF MANUFACTURING LONG CRENELATED METAL PRODUCTS, PARTICULARLY STEEL, AND DEVICE FOR IMPLEMENTING SAME |
DE3431008C2 (en) | 1984-08-23 | 1986-10-16 | Dyckerhoff & Widmann AG, 8000 München | Heat treatment of hot rolled bars or wires |
DD239805B1 (en) * | 1985-07-29 | 1988-06-22 | Thaelmann Schwermaschbau Veb | METHOD FOR PRODUCING A CONCRETE STEEL |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1327495A (en) * | 1962-06-28 | 1963-05-17 | Tor Isteg Steel Corp | Manufacturing process of steel bars, in particular bars for reinforced concrete |
US3231432A (en) * | 1964-10-08 | 1966-01-25 | Morgan Construction Co | Process for the quenching of hot rolled rods in direct sequence with rod mill |
FR2005819A1 (en) * | 1969-04-03 | 1969-12-19 | Centre Nat Rech Metall | Concrete reinforcement steel with high stretch strength - and improved weldability |
NL168000C (en) * | 1971-04-14 | 1982-02-16 | Koninklijke Hoogovens En Staal | METHOD FOR PRODUCING LOW CARBON STEEL PROFILE PROFILE, AND WELDED PRODUCTS, SUCH AS CONCRETE MATS, MANUFACTURED FROM PROFILED BARS OBTAINED |
NL170159C (en) * | 1973-06-04 | 1982-10-01 | Estel Hoogovens Bv | METHOD FOR MANUFACTURING WELDABLE LOW CARBON STEEL MATERIAL BY CONTROLLED COOLING |
DD106661A1 (en) * | 1973-09-24 | 1974-06-20 | ||
IT1090143B (en) * | 1975-01-29 | 1985-06-18 | Centre Rech Metallurgique | PROCESS FOR MANUFACTURING LAMINATED STEEL PRODUCTS |
BE847379A (en) * | 1976-10-15 | 1977-01-31 | PROCESS FOR THE MANUFACTURE OF HIGH ELASTIC LIMIT STEEL WIRE. |
-
1978
- 1978-06-16 ES ES470858A patent/ES470858A1/en not_active Expired
- 1978-06-19 LU LU79840A patent/LU79840A1/en unknown
- 1978-06-19 NO NO782125A patent/NO782125L/en unknown
- 1978-06-19 AT AT0446678A patent/ATA446678A/en not_active Application Discontinuation
- 1978-06-19 DE DE19782826826 patent/DE2826826A1/en not_active Withdrawn
- 1978-06-19 SE SE7806987A patent/SE7806987L/en unknown
- 1978-06-19 NL NL7806613A patent/NL7806613A/en not_active Application Discontinuation
- 1978-06-20 FR FR7818427A patent/FR2395084A1/en active Granted
Also Published As
Publication number | Publication date |
---|---|
ATA446678A (en) | 1983-02-15 |
LU79840A1 (en) | 1978-12-07 |
ES470858A1 (en) | 1979-10-01 |
FR2395084B1 (en) | 1983-09-16 |
DE2826826A1 (en) | 1979-01-04 |
SE7806987L (en) | 1978-12-21 |
NL7806613A (en) | 1978-12-22 |
FR2395084A1 (en) | 1979-01-19 |
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