EP1319731A1 - Fireproof steel for a steel construction and process for manufacturing warm rolled hollow profiles, supports, a shape steel or a plate made thereof - Google Patents
Fireproof steel for a steel construction and process for manufacturing warm rolled hollow profiles, supports, a shape steel or a plate made thereof Download PDFInfo
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- EP1319731A1 EP1319731A1 EP02090400A EP02090400A EP1319731A1 EP 1319731 A1 EP1319731 A1 EP 1319731A1 EP 02090400 A EP02090400 A EP 02090400A EP 02090400 A EP02090400 A EP 02090400A EP 1319731 A1 EP1319731 A1 EP 1319731A1
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- steel
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- hollow profiles
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- 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
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- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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- 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
- C21D8/10—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies
Definitions
- the invention relates to a fire-resistant weldable steel, in particular in Form of hot-rolled hollow profiles, beams, shaped steel or heavy plate for steel construction as well as a process for the production of hot-rolled hollow profiles, beams or shaped steel or heavy plate from it.
- Fire-resistant steels must have high heat resistance so that they can be used in steel construction Reduction of expensive fire protection measures is made possible.
- steel parts are covered either by spray plaster or panels, or provided with filling material.
- the aim of these measures is to ensure that the time until To reach a critical temperature as long as possible or to extend this temperature not to be reached at all.
- these requirements are classified as fire resistance class, z. B. F30, F60, F90 etc., where F is the abbreviation for fire resistance class and the number 30, 60 or 90 indicates the time in minutes until after the outbreak fire, the supporting structure must still be functional.
- EP 0347156 B2 discloses a fire-resistant steel which has a Mn content in the range from 0.5 to 1.6% by weight, in particular a Mo content in the range from 0.2 to 0.7% by weight. having.
- This steel grade is combined with a rolling technology, which is characterized by hot finish rolling at a temperature of 800 to 1000 ° C, then air cooling to a temperature from A r3 -20 ° C to A r3 -100 ° C and a subsequent water cooling to a temperature below of 550 ° C with a cooling rate of 3 to 40 ° C / sec. distinguished.
- the steel produced in this way has a hot yield point at 600 ° C of approx. 230 MPa.
- This steel is also easy to weld with a CE IIW value ⁇ 0.5 1 ,
- a comparable steel is known from EP 0470055 A2.
- the steel grades have Mn, Cr, Mo, Nb, Ti and Cu as main elements.
- This steel grade is also combined with a specific rolling technology. In this case, the final rolling temperatures are between 800 and 950 ° C with subsequent water cooling to 550 to 700 ° C with a cooling rate of 5 to 35 ° C / sec.
- the disclosed method is limited to thicknesses between 1.5 and 12 mm.
- the weldability of this steel is good because the CE IIW value is less than 0.3. No statement can be made about the hot stretch limit, since information on this is missing in the writing. Only the relative decrease in the yield strength with increasing temperature is shown. Such a representation is useless for the designer who is responsible for the design of the component made from this steel, since he needs quantitative values for his design, which he can use in his calculation formulas.
- a fire-resistant nickel-free steel for steel construction and a method for producing heavy plate therefrom is known from EP 0882807 B1.
- This steel grade is characterized by a Mn content in the range from 0.5 to 1.6% by weight and a Mo content in the range from 0.10 to 0.40% by weight.
- Cr in the range from 0.5 to 0.9% by weight and V in the range from 0.01 to 0.05% by weight are also added.
- the hot stretch limit of this known steel is at least 250 MPa at a temperature of 600 ° C.
- the CE IIW value is in the range from 0.27 to 0.79. It is emphasized as essential to the invention that the steel has a yield strength ratio R e / R m at room temperature of between 0.4 and 0.6.
- the object of the invention is to provide a fire-resistant weldable steel which in particular in the form of a hot-rolled hollow profile, beam, shaped steel or heavy plate can be used in steel construction without protective measures where the fulfillment the fire resistance class F30 is an approval requirement.
- a fire-resistant weldable steel is proposed in particular in the form of hot-rolled hollow profiles, beams, shaped steel or heavy plate for steel construction with the following chemical composition and other features: 0.06-0.13% C; 0.15-0.50% Si; 1.0 - 2.0% Mn; Max. 0.025% P; Max. 0.02% S; 0.005-0.040% Al; 0.20-0.40 Mo; 0.40 - 0.70% W; 0.02 - 0.05% Nb remainder iron with melting-related impurities, whereby the component made from this steel has a hot yield strength at 600 ° C of at least 200 MPa and a CE IIW value ⁇ 0.5.
- Essential to the invention is the alloying of W with a balanced ratio of C, Mn and Mo.
- the good weldability even with larger wall thicknesses is guaranteed by a CE IIW value ⁇ 0.5.
- the advantage of the proposed steel is that if the expensive elements, such as Mo and W, are alloyed only slightly, the hot stretching limit is higher, in particular beyond the range of 600 ° C., than with comparable steels. This takes advantage of the effect that tungsten is more effective than chromium in increasing the hot stretch and does not restrict welding suitability, since tungsten is not included in the formula for the CE IIW value. For this reason, the elements Ni and Cu are not alloyed.
- Another advantage is that the yield strength values at RT or at minus temperatures are high, so that the designer does not have any restrictions in his design is subject.
- the designer in structural steel construction is provided with a structural steel given the hand that enables him to produce the component produced from it without complex Fire protection measures or without enlarging the cross-section or increasing the wall thickness, in the sense of meeting fire resistance class F30.
- the good Suitability for welding, even with larger thicknesses, also makes it possible on site at the construction site to be able to weld without problems.
- the hollow profile, the carrier, shaped steel or heavy plate, hard rolled, d. H. without subsequent heat treatment become. If necessary, straightening is necessary beforehand.
- Normalization is required if the customer places high demands on the toughness of the component or remuneration, d. H. Hardening and tempering of the rolled product, required. alternative it can also be advantageous to use inline normalization.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
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- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
Description
Die Erfindung bezieht sich auf einen feuerresistenten schweißbaren Stahl, insbesondere in Form von warmgewalzten Hohlprofilen, Trägern, Formstahl oder Grobblech für den Stahlbau sowie ein Verfahren zur Herstellung von warmgewalzten Hohlprofilen, Trägern oder Formstahl oder Grobblech daraus.The invention relates to a fire-resistant weldable steel, in particular in Form of hot-rolled hollow profiles, beams, shaped steel or heavy plate for steel construction as well as a process for the production of hot-rolled hollow profiles, beams or shaped steel or heavy plate from it.
Feuerresistente Stähle müssen eine hohe Warmfestigkeit aufweisen, damit im Stahlbau eine Verringerung von teuren Brandschutzmaßnahmen ermöglicht wird. Für den Brandschutz von Stahlkonstruktionen werden Stahlteile entweder durch Spritzputz oder Platten abgedeckt, bzw. mit Füllmaterial versehen. Ziel dieser Maßnahmen ist es, im Brandfall die Zeit bis zum Erreichen einer kritischen Temperatur möglichst lang auszudehnen oder diese Temperatur erst gar nicht zu erreichen. Im Regelwerk sind diese Forderungen als Feuerwiderstandsklasse, z. B. F30, F60, F90 usw., festgelegt, wobei F die Abkürzung für Feuerwiderstandsklasse ist und die Zahl 30, 60 bzw. 90 die Zeit in Minuten angibt, bis zu der nach Ausbruch des Brandes die tragende Konstruktion noch funktionsfähig sein muss.Fire-resistant steels must have high heat resistance so that they can be used in steel construction Reduction of expensive fire protection measures is made possible. For the fire protection of Steel structures, steel parts are covered either by spray plaster or panels, or provided with filling material. The aim of these measures is to ensure that the time until To reach a critical temperature as long as possible or to extend this temperature not to be reached at all. In the regulations, these requirements are classified as fire resistance class, z. B. F30, F60, F90 etc., where F is the abbreviation for fire resistance class and the number 30, 60 or 90 indicates the time in minutes until after the outbreak fire, the supporting structure must still be functional.
Neben den oben genannten Brandschutzmaßnahmen gibt es auch die Möglichkeit, die Querschnitte bzw. Wanddicken der tragenden Elemente, wie z. B. Stützen oder Träger, entsprechend auszulegen, um den Forderungen zu genügen. Das führt aber zu schweren und teuren Konstruktionen und verringert den ausnutzbaren Raum. In addition to the fire protection measures mentioned above, there is also the option of Cross sections or wall thicknesses of the load-bearing elements, such as. B. supports or beams, to be interpreted accordingly to meet the requirements. But that leads to serious and expensive constructions and reduces the usable space.
Im Stand der Technik sind eine Reihe feuerresistenter Stähle bekannt, die eine hohe Warmstreckgrenze aufweisen. Beispielsweise ist in der EP 0347156 B2 ein feuerresistenter Stahl offenbart, der einen Mn-Gehalt im Bereich von 0,5 bis 1,6 Gew.-% insbesondere einen Mo-Gehalt im Bereich von 0,2 bis 0,7 Gew.-% aufweist. Kombiniert ist diese Stahlgüte mit einer Walztechnologie, die sich durch ein Warmfertigwalzen bei einer Temperatur von 800 bis 1000°C, dann Luftabkühlung auf eine Temperatur von Ar3 -20°C bis Ar3 -100°C und einer anschließenden Wasserabkühlung auf eine Temperatur unterhalb von 550°C mit einer Abkühlgeschwindigkeit von 3 bis 40°C/sec. auszeichnet. Der so hergestellte Stahl weist eine Warmstreckgrenze bei 600°C von ca. 230 MPa auf. Dieser Stahl ist auch gut schweißbar mit einem CEIIW-Wert < 0,51 .A number of fire-resistant steels are known in the prior art which have a high hot yield strength. For example, EP 0347156 B2 discloses a fire-resistant steel which has a Mn content in the range from 0.5 to 1.6% by weight, in particular a Mo content in the range from 0.2 to 0.7% by weight. having. This steel grade is combined with a rolling technology, which is characterized by hot finish rolling at a temperature of 800 to 1000 ° C, then air cooling to a temperature from A r3 -20 ° C to A r3 -100 ° C and a subsequent water cooling to a temperature below of 550 ° C with a cooling rate of 3 to 40 ° C / sec. distinguished. The steel produced in this way has a hot yield point at 600 ° C of approx. 230 MPa. This steel is also easy to weld with a CE IIW value <0.5 1 ,
Ein vergleichbarer Stahl ist aus der EP 0470055 A2 bekannt. Die Stahlgüte weist als Hauptelemente Mn, Cr, Mo, Nb, Ti und Cu auf. Auch diese Stahlgüte ist mit einer bestimmten Walztechnologie kombiniert. In diesem Fall liegen die Endwalztemperaturen zwischen 800 und 950°C mit anschließender Wasserabkühlung auf 550 bis 700°C mit einer Abkühlrate von 5 bis 35°C/sec. Beschränkt ist das offenbarte Verfahren für Dicken zwischen 1,5 und 12 mm. Die Schweißeignung dieses Stahles ist gut, da der CEIIW-Wert unter 0,3 liegt. Über die Warmstreckgrenze kann keine Aussage gemacht werden, da in der Schrift hierüber Angaben fehlen. Dargestellt ist nur die relative Abnahme der Streckgrenze mit steigender Temperatur. Eine solche Darstellung ist für den Konstrukteur, der für die Auslegung des aus diesem Stahl gefertigten Bauteiles verantwortlich ist, aber unbrauchbar, da er für seine Auslegung quantitative Werte benötigt, die er in seine Berechnungsformeln einsetzen kann.A comparable steel is known from EP 0470055 A2. The steel grades have Mn, Cr, Mo, Nb, Ti and Cu as main elements. This steel grade is also combined with a specific rolling technology. In this case, the final rolling temperatures are between 800 and 950 ° C with subsequent water cooling to 550 to 700 ° C with a cooling rate of 5 to 35 ° C / sec. The disclosed method is limited to thicknesses between 1.5 and 12 mm. The weldability of this steel is good because the CE IIW value is less than 0.3. No statement can be made about the hot stretch limit, since information on this is missing in the writing. Only the relative decrease in the yield strength with increasing temperature is shown. Such a representation is useless for the designer who is responsible for the design of the component made from this steel, since he needs quantitative values for his design, which he can use in his calculation formulas.
Ein feuerresistenter nickelfreier Stahl für den Stahlbau und ein Verfahren zur Herstellung von Grobblech daraus ist aus der EP 0882807 B1 bekannt. Diese Stahlgüte zeichnet sich durch einen Mn-Gehalt im Bereich von 0,5 bis 1,6 Gew.-% und einem Mo-Gehalt im Bereich von 0,10 bis 0,40 Gew.-% aus. Zulegiert werden darüber hinaus Cr im Bereich von 0,5 bis 0,9 Gew.-% und V im Bereich von 0,01 bis 0,05 Gew.-%. Die Warmstreckgrenze dieses bekannten Stahles liegt bei mind. 250 MPa bei einer Temperatur von 600°C. Der CEIIW-Wert liegt im Bereich von 0,27 bis 0,79. Als erfindungswesentlich wird herausgestellt, dass der Stahl ein Streckgrenzenverhältnis Re/Rm bei Raumtemperatur zwischen 0,4 bis 0,6 aufweist. A fire-resistant nickel-free steel for steel construction and a method for producing heavy plate therefrom is known from EP 0882807 B1. This steel grade is characterized by a Mn content in the range from 0.5 to 1.6% by weight and a Mo content in the range from 0.10 to 0.40% by weight. Cr in the range from 0.5 to 0.9% by weight and V in the range from 0.01 to 0.05% by weight are also added. The hot stretch limit of this known steel is at least 250 MPa at a temperature of 600 ° C. The CE IIW value is in the range from 0.27 to 0.79. It is emphasized as essential to the invention that the steel has a yield strength ratio R e / R m at room temperature of between 0.4 and 0.6.
Aufgabe der Erfindung ist es, einen feuerresistenten schweißbaren Stahl anzugeben, der insbesondere in Form eines warmgewalzten Hohlprofils, Trägers, Formstahls oder Grobbleches im Stahlhochbau ohne Schutzmaßnahmen dort eingesetzt werden kann, wo die Erfüllung der Feuer-Widerstandsklasse F30 Zulassungsbedingung ist.The object of the invention is to provide a fire-resistant weldable steel which in particular in the form of a hot-rolled hollow profile, beam, shaped steel or heavy plate can be used in steel construction without protective measures where the fulfillment the fire resistance class F30 is an approval requirement.
Diese Aufgabe wird ausgehend vom Oberbegriff in Verbindung mit den kennzeichnenden Merkmalen des Anspruches 1 gelöst. Vorteilhafte Weiterbildungen sowie ein Verfahren zur Herstellung eines warmgewalzten Hohlprofiles, Trägers, Formstahls oder Grobbleches sind Gegenstand von Unteransprüchen.This task is based on the generic term in conjunction with the characteristic Features of claim 1 solved. Advantageous further developments and a method for Production of a hot-rolled hollow profile, beam, shaped steel or heavy plate Subject of subclaims.
Nach der Lehre der Erfindung wird ein feuerresistenter schweißbarer Stahl insbesondere in Form von warmgewalzten Hohlprofilen, Trägern, Formstahl oder Grobblech für den Stahlbau mit folgender chemischer Zusammensetzung und sonstigen Merkmalen vorgeschlagen: 0,06 - 0,13 % C; 0,15 - 0,50 % Si; 1,0 - 2,0 % Mn; max. 0,025 % P; max. 0,02 % S; 0,005 - 0,040 % Al; 0,20 - 0,40 Mo; 0,40 - 0,70 % W; 0,02 - 0,05 % Nb Rest Eisen mit erschmelzungsbedingten Verunreinigungen, wobei das aus diesem Stahl hergestellte Bauteil eine Warmstreckgrenze bei 600 °C von mindestens 200 MPa und einen CEIIW-Wert < 0,5 aufweist.According to the teaching of the invention, a fire-resistant weldable steel is proposed in particular in the form of hot-rolled hollow profiles, beams, shaped steel or heavy plate for steel construction with the following chemical composition and other features: 0.06-0.13% C; 0.15-0.50% Si; 1.0 - 2.0% Mn; Max. 0.025% P; Max. 0.02% S; 0.005-0.040% Al; 0.20-0.40 Mo; 0.40 - 0.70% W; 0.02 - 0.05% Nb remainder iron with melting-related impurities, whereby the component made from this steel has a hot yield strength at 600 ° C of at least 200 MPa and a CE IIW value <0.5.
Erfindungswesentlich ist die Zulegierung von W bei einem ausgewogenen Verhältnis von C, Mn und Mo. Die gute Schweißeignung auch bei größeren Wanddicken wird durch einen CEIIW-Wert < 0,5 gewährleistet.Essential to the invention is the alloying of W with a balanced ratio of C, Mn and Mo. The good weldability even with larger wall thicknesses is guaranteed by a CE IIW value <0.5.
Der Vorteil des vorgeschlagenen Stahls ist darin zu sehen, dass bei einer nur geringen Zulegierung der teuren Elemente, wie Mo und W, die Warmstreckgrenze insbesondere über den Bereich von 600°C hinaus höher liegt als bei vergleichbaren Stählen. Dabei macht man sich den Effekt zu Nutze, dass Wolfram hinsichtlich einer Erhöhung der Warmstreckgrenze wirksamer ist als Chrom und zudem die Schweißeignung nicht einschränkt, da Wolfram in die Formel für den CEIIW-Wert nicht mit eingeht. Aus diesem Grunde wird auch auf eine Zulegierung der Elemente Ni und Cu verzichtet. The advantage of the proposed steel is that if the expensive elements, such as Mo and W, are alloyed only slightly, the hot stretching limit is higher, in particular beyond the range of 600 ° C., than with comparable steels. This takes advantage of the effect that tungsten is more effective than chromium in increasing the hot stretch and does not restrict welding suitability, since tungsten is not included in the formula for the CE IIW value. For this reason, the elements Ni and Cu are not alloyed.
Von weiterem Vorteil ist, dass die Streckgrenzwerte bei RT bzw. bei Minustemperaturen hoch sind, so dass der Konstrukteur bei seiner Auslegung hier keinen Einschränkungen unterworfen ist.Another advantage is that the yield strength values at RT or at minus temperatures are high, so that the designer does not have any restrictions in his design is subject.
Mit der vorgeschlagenen Stahlgüte wird dem Konstrukteur im Stahlhochbau ein Baustahl an die Hand gegeben, der es ihm ermöglicht, das daraus erzeugte Bauteil ohne aufwendige Brandschutzmaßnahmen bzw. ohne Querschnittsvergrößerungen oder Wanddickenzunahme, im Sinne der Erfüllung der Feuer-Widerstandsklasse F30, direkt einzusetzen. Die gute Schweißeignung, auch bei größeren Dicken, ermöglicht es zudem vor Ort an der Baustelle ohne Probleme schweißen zu können.With the proposed steel grade, the designer in structural steel construction is provided with a structural steel given the hand that enables him to produce the component produced from it without complex Fire protection measures or without enlarging the cross-section or increasing the wall thickness, in the sense of meeting fire resistance class F30. The good Suitability for welding, even with larger thicknesses, also makes it possible on site at the construction site to be able to weld without problems.
Nach einem weiteren Merkmal der Erfindung kann das Hohlprofil, der Träger, Formstahl oder Grobblech walzhart, d. h. ohne eine anschließende Wärmebehandlung, ausgeliefert werden. Gegebenenfalls ist zuvor noch ein Richten erforderlich.According to a further feature of the invention, the hollow profile, the carrier, shaped steel or heavy plate, hard rolled, d. H. without subsequent heat treatment become. If necessary, straightening is necessary beforehand.
Bei hohen Anforderungen des Bestellers hinsichtlich der Zähigkeit des Bauteils ist ein Normalisieren bzw. Vergüten, d. h. Härten und Anlassen des Walzproduktes, erforderlich. Alternativ kann es auch von Vorteil sein, ein Inline-Normalisieren anzuwenden.Normalization is required if the customer places high demands on the toughness of the component or remuneration, d. H. Hardening and tempering of the rolled product, required. alternative it can also be advantageous to use inline normalization.
Claims (10)
dadurch gekennzeichnet, dass der Stahl im Strangguss zu Stangen vergossen wird, die nach der Aufteilung in einzelne Stäbe und nach dem Erwärmen auf ≥ 1200°C zu einem Hohlprofil warmgewalzt werden bei Endwalztemperaturen zwischen 800 und 1000°C mit anschließender Abkühlung an Luft.Process for the production of hot-rolled hollow profiles with thicknesses up to 30 mm from a steel of the composition according to claim 1
characterized in that the steel is cast into rods in continuous casting, which after the division into individual rods and after heating to ≥ 1200 ° C are hot-rolled into a hollow profile at final rolling temperatures between 800 and 1000 ° C with subsequent cooling in air.
dadurch gekennzeichnet, dass beim Warmwalzen zuerst eine Luppe erzeugt wird, die von Walztemperatur auf eine Temperatur im Bereich zwischen 450 bis 650 °C abgekühlt und nach Wiedererwärmung auf 950 bis 1050 °C auf Fertigabmessung gewalzt wird mit Endwalztemperaturen zwischen 800 und 1000 °C mit anschließender Abkühlung an Luft. The method of claim 2
characterized in that during hot rolling a blank is first produced, which is cooled from the rolling temperature to a temperature in the range between 450 to 650 ° C and, after reheating to 950 to 1050 ° C, is rolled to the final dimension with final rolling temperatures between 800 and 1000 ° C and then Cooling in air.
dadurch gekennzeichnet, dass die Hohlprofile von Endwalztemperatur bis auf 600 °C rasch abgekühlt werden mit einer Abkühlrate von mindestens 6 °C/sec, an die sich eine langsame Abkühlung an Luft anschließt.Process according to claims 1 and 2
characterized in that the hollow profiles are rapidly cooled from the final rolling temperature to 600 ° C at a cooling rate of at least 6 ° C / sec, followed by a slow cooling in air.
dadurch gekennzeichnet, dass die Hohlprofile von Endwalztemperatur bis auf <100°C rasch abgekühlt werden mit einer Abkühlrate von mindestens 15 °C/sec an die sich eine langsame Abkühlung an Luft anschließt.Process according to claims 1 and 2
characterized in that the hollow profiles are rapidly cooled from the final rolling temperature to <100 ° C with a cooling rate of at least 15 ° C / sec followed by a slow cooling in air.
dadurch gekennzeichnet, dass die warmgewalzten und gehärteten Hohlprofile bei Temperaturen im Bereich von 580 bis 680 °C angelassen werden.Process according to claims 2 to 5
characterized in that the hot-rolled and hardened hollow profiles are tempered at temperatures in the range from 580 to 680 ° C.
dadurch gekennzeichnet, dass der Stahl im Strangguss zu Brammen, Beam-Blanks oder Vorblöcken vergossen wird, die nach dem Erwärmen auf ≥1200 °C zu Trägern oder Formstahl warmgewalzt werden bei Endwalztemperaturen zwischen 800 bis 1000 °C mit abschließender Abkühlung an Luft.A process for producing hot-rolled beams or shaped steel from a steel of the composition according to claim 1
characterized in that the steel is cast in continuous casting to form slabs, beam blanks or blooms, which are hot-rolled to beams or shaped steel after heating to ≥1200 ° C at final rolling temperatures between 800 and 1000 ° C with subsequent cooling in air.
dadurch gekennzeichnet, dass der Stahl im Strangguss zu Brammen vergossen wird, die nach dem Erwärmen auf ≥1200 °C zu Grobblech warmgewalzt werden bei Endwalztemperaturen zwischen 800 und 1000 °C mit abschließender Abkühlung an Luft.A method for producing hot-rolled heavy plate from a steel of the composition according to claim 1
characterized in that the steel is cast into slabs, which are hot-rolled after heating to ≥1200 ° C to heavy plate at final rolling temperatures between 800 and 1000 ° C with final cooling in air.
dadurch gekennzeichnet, dass die warmgewalzten Hohlprofile, Träger, Formstähle und Grobbleche von Raumtemperatur wieder auf 900 bis 1000 °C aufgewärmt, zur Durcherwärmung je nach Dicke bei Erwärmungstemperaturen entsprechend gehalten und anschließend wieder an Luft abgekühlt werden.Process according to claims 1, 2, 7 and 8
characterized in that the hot-rolled hollow profiles, beams, shaped steels and heavy plates are reheated from room temperature to 900 to 1000 ° C, kept at the appropriate temperature for heating depending on the thickness and then cooled again in air.
dadurch gekennzeichnet, dass die warmgewalzten Hohlprofile, Träger, Formstähle und Grobbleche von Raumtemperatur wieder auf 900 bis 1000 °C aufgewärmt, zur Durcherwärmung je nach Dicke bei Erwärmungstemperatur entsprechend gehalten, danach mit einer Abschreckgeschwindigkeit von mindestens 15 °C/sec auf < 100 °C gehärtet und abschließend bei 580 bis 680 °C angelassen werden.Process according to claims 1, 2, 7 and 8
characterized in that the hot-rolled hollow profiles, beams, shaped steels and heavy plates are warmed up again from room temperature to 900 to 1000 ° C, kept for heating through depending on the thickness at the heating temperature, then at a quenching rate of at least 15 ° C / sec to <100 ° C hardened and finally tempered at 580 to 680 ° C.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE10164567 | 2001-12-14 | ||
| DE10164567 | 2001-12-14 | ||
| DE10258114 | 2002-12-06 | ||
| DE10258114A DE10258114B4 (en) | 2001-12-14 | 2002-12-06 | Fire-resistant welding steel in the form of hollow profiles, supports or molded steel contains alloying additions of silicon, manganese, aluminum, molybdenum, tungsten and niobium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP1319731A1 true EP1319731A1 (en) | 2003-06-18 |
Family
ID=26010883
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP02090400A Ceased EP1319731A1 (en) | 2001-12-14 | 2002-12-11 | Fireproof steel for a steel construction and process for manufacturing warm rolled hollow profiles, supports, a shape steel or a plate made thereof |
Country Status (1)
| Country | Link |
|---|---|
| EP (1) | EP1319731A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108774712A (en) * | 2018-06-21 | 2018-11-09 | 河南中原特钢装备制造有限公司 | Superelevation thermal conductivity hot stamping die steel and its manufacturing method |
| CN109680215A (en) * | 2019-03-06 | 2019-04-26 | 中国科学院金属研究所 | A kind of refractory steel and preparation method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0347156A2 (en) * | 1988-06-13 | 1989-12-20 | Nippon Steel Corporation | Process for manufacturing building construction steel having excellent fire resistance and low yield ratio, and construction steel obtained thereby |
| JPH04103716A (en) * | 1990-08-20 | 1992-04-06 | Sumitomo Metal Ind Ltd | Production of non-heat-treated high-tensile steel for construction and building material |
| JPH04350120A (en) * | 1991-05-29 | 1992-12-04 | Kobe Steel Ltd | Production of high strength refractory steel plate for construction use |
| JPH06248334A (en) * | 1993-03-01 | 1994-09-06 | Kawasaki Steel Corp | Production of refractory steel material for building structure |
-
2002
- 2002-12-11 EP EP02090400A patent/EP1319731A1/en not_active Ceased
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0347156A2 (en) * | 1988-06-13 | 1989-12-20 | Nippon Steel Corporation | Process for manufacturing building construction steel having excellent fire resistance and low yield ratio, and construction steel obtained thereby |
| JPH04103716A (en) * | 1990-08-20 | 1992-04-06 | Sumitomo Metal Ind Ltd | Production of non-heat-treated high-tensile steel for construction and building material |
| JPH04350120A (en) * | 1991-05-29 | 1992-12-04 | Kobe Steel Ltd | Production of high strength refractory steel plate for construction use |
| JPH06248334A (en) * | 1993-03-01 | 1994-09-06 | Kawasaki Steel Corp | Production of refractory steel material for building structure |
Non-Patent Citations (4)
| Title |
|---|
| EDUARD HOUDREMONT: "Handbuch der Sonderstahlkunde", 1956, SPRINGER- VERLAG, BERLIN, XP002229746 * |
| PATENT ABSTRACTS OF JAPAN vol. 016, no. 342 (C - 0966) 24 July 1992 (1992-07-24) * |
| PATENT ABSTRACTS OF JAPAN vol. 017, no. 205 (C - 1051) 22 April 1993 (1993-04-22) * |
| PATENT ABSTRACTS OF JAPAN vol. 018, no. 647 (C - 1283) 8 December 1994 (1994-12-08) * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108774712A (en) * | 2018-06-21 | 2018-11-09 | 河南中原特钢装备制造有限公司 | Superelevation thermal conductivity hot stamping die steel and its manufacturing method |
| CN109680215A (en) * | 2019-03-06 | 2019-04-26 | 中国科学院金属研究所 | A kind of refractory steel and preparation method thereof |
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