EP0092629A1 - Process for the manufacture of rods and tubes from steels with great mechanical properties - Google Patents
Process for the manufacture of rods and tubes from steels with great mechanical properties Download PDFInfo
- Publication number
- EP0092629A1 EP0092629A1 EP82420154A EP82420154A EP0092629A1 EP 0092629 A1 EP0092629 A1 EP 0092629A1 EP 82420154 A EP82420154 A EP 82420154A EP 82420154 A EP82420154 A EP 82420154A EP 0092629 A1 EP0092629 A1 EP 0092629A1
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- Prior art keywords
- bars
- tubes
- mass
- hot
- steel
- Prior art date
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 20
- 239000010959 steel Substances 0.000 title claims abstract description 20
- 238000000034 method Methods 0.000 title claims abstract description 17
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 9
- 238000005098 hot rolling Methods 0.000 claims abstract description 13
- 238000005496 tempering Methods 0.000 claims abstract description 5
- 239000012535 impurity Substances 0.000 claims description 9
- 238000005096 rolling process Methods 0.000 claims description 5
- 229910052784 alkaline earth metal Inorganic materials 0.000 claims description 3
- 150000001342 alkaline earth metals Chemical class 0.000 claims description 3
- 229910052804 chromium Inorganic materials 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 229910052750 molybdenum Inorganic materials 0.000 claims description 3
- 229910052759 nickel Inorganic materials 0.000 claims description 3
- 229910052761 rare earth metal Inorganic materials 0.000 claims description 3
- 150000002910 rare earth metals Chemical class 0.000 claims description 3
- 230000009466 transformation Effects 0.000 claims description 3
- 229910052751 metal Inorganic materials 0.000 claims 2
- 239000002184 metal Substances 0.000 claims 2
- 238000007792 addition Methods 0.000 abstract description 6
- 229910000851 Alloy steel Inorganic materials 0.000 abstract description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 2
- 229910052782 aluminium Inorganic materials 0.000 abstract description 2
- 229910052796 boron Inorganic materials 0.000 abstract description 2
- 229910052799 carbon Inorganic materials 0.000 abstract description 2
- 229910052748 manganese Inorganic materials 0.000 abstract description 2
- 229910052758 niobium Inorganic materials 0.000 abstract description 2
- 239000011572 manganese Substances 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 239000010955 niobium Substances 0.000 description 4
- 238000009749 continuous casting Methods 0.000 description 3
- 238000005266 casting Methods 0.000 description 2
- 238000005553 drilling Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000003208 petroleum Substances 0.000 description 2
- 238000011282 treatment Methods 0.000 description 2
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
- -1 Ca and / or Mg Chemical class 0.000 description 1
- UDHXJZHVNHGCEC-UHFFFAOYSA-N Chlorophacinone Chemical compound C1=CC(Cl)=CC=C1C(C=1C=CC=CC=1)C(=O)C1C(=O)C2=CC=CC=C2C1=O UDHXJZHVNHGCEC-UHFFFAOYSA-N 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000003303 reheating Methods 0.000 description 1
- 239000003923 scrap metal Substances 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
- 238000011426 transformation method Methods 0.000 description 1
- 230000001131 transforming effect Effects 0.000 description 1
- 238000009785 tube rolling Methods 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
- C21D8/10—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies
-
- 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
Definitions
- the process which is the subject of the invention relates to a new method of manufacturing bars and tubes of low alloy steel, having in the raw state of hot transformation high mechanical characteristics, the elastic limit, the load. and the resilience being particularly high.
- the method also relates to a method which makes it possible to significantly reduce the costs of transforming steel in the form of bars or tubes with high mechanical characteristics.
- the invention also relates to bars and tubes having high mechanical characteristics in the raw state of hot rolling by virtue of the combination of a composition defined within precise ranges and a predominantly bainitic structure.
- the invention relates to bars or tubes having mechanical characteristics at least equal to the minimum characteristics of grade N80 of the American Petroleum Institute, obtained by a production and transformation method much more economical than the usual methods. used.
- the usual methods of manufacturing bars or tubes having mechanical characteristics corresponding to grade N80 of the American Petroleum Institute consist in developing a low-alloy steel such as steel according to standard AFNOR 40MD7.
- This steel contains Z en mass; C 0.25 to 0.50; Mn 1.20 to 1.70; Mo 0.20 and the usual impurities.
- this steel is transformed by hot rolling into bars of the desired section, for example round bars from 100 to 200 mm in diameter. In the raw hot rolling state, these bars generally have an elastic limit of around 750 MPa but a low resilience of less than 30 Joules / cm2, measured on KCU test pieces.
- the steel After casting in the form of ingots or continuous casting bars, the steel is transformed under controlled conditions.
- the roughing of the ingots, during blooming, is carried out in a conventional manner at a temperature of approximately 1200 to 1050 ° C.
- the bars thus obtained, or else the continuous casting bars undergo a controlled rolling at a temperature between 1000 and 700 ° C. in a single hot operation until bars of the desired section are obtained, circular or not.
- the raw hot rolling bar is drilled by hot drilling and then the tube blank obtained is hot rolled on a mandrel to the desired dimension.
- This tempering is preferably carried out at a temperature between 550 and 700 ° C.
- the high mechanical properties of the products obtained by the process according to the invention essentially result from the action of the hot rolling operation carried out, within defined temperature limits and with a well-defined wrought rate, on a steel whose composition is within the limits specified above. Thanks to its low carbon content, associated with a well-defined manganese content and a combination of additions of niobium, boron and aluminum, in critical proportions, it is possible to eliminate the conventional treatments which were considered compulsory to obtain these very specific mechanical characteristics.
- a steel is produced containing in% by mass: C 0.085; If 0.452; Mn 1.520; Nb 0.060; Al 0.071; B 0.0049; N 0.007; Ni 0.136; Cr 0.167; Cu 0.228; S 0.028; P 0.017; remains Fe and usual impurities.
- This steel is cast in 5.8-ton ingots. These ingots are preheated to 1230 ° C, then roughed out in blooming in 182 x 182 mm bars at a temperature between 1200 and 1050 ° C and then continuously rolled into 140 mm diameter round bars.
- the inlet temperature is approximately 950 ° C and the temperature at the outlet of the last stand of the rolling mill is approximately 710 ° C.
- 10 mm diameter test pieces for tensile tests as well as test pieces for resilience measurements of the long KCU type are taken from these bars, rough hot-rolled. These samples are taken 25 mm from the surface (axis of the test piece 0 10 mm located 25 mm below this surface).
- the elastic limit is greater than 550 MPa and that the resilience is greater than 80 J / cm 2 .
- micrographic examinations show that the structure of the bar is homogeneous and predominantly bainitic in all points. It is also possible to apply the method according to the invention to the production of bars of section other than circular, such as square or rectangular bars or of any section. In all cases, the rolling operation which makes it possible to obtain these bars must be carried out at a temperature of between 1000 and 700 ° C. and the rate of working must preferably reach at least 50X without intermediate reheating.
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Thermal Sciences (AREA)
- Physics & Mathematics (AREA)
- Crystallography & Structural Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Heat Treatment Of Steel (AREA)
- Metal Rolling (AREA)
- Metal Extraction Processes (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
Description
Le procédé qui fait l'objet de l'invention concerne une nouvelle méthode de fabrication de barres et de tubes en acier faiblement allié, présentant à l'état brut de transformation à chaud de hautes caractéristiques mécaniques, la limite d'élasticité, la charge de rupture et la résilience étant particulièrement élevées. Le procédé concerne également une méthode qui permet d'abaisser de façon très importante les frais de transformation de l'acier sous forme de barres ou de tubes à hautes caractéristiques mécaniques.The process which is the subject of the invention relates to a new method of manufacturing bars and tubes of low alloy steel, having in the raw state of hot transformation high mechanical characteristics, the elastic limit, the load. and the resilience being particularly high. The method also relates to a method which makes it possible to significantly reduce the costs of transforming steel in the form of bars or tubes with high mechanical characteristics.
L'invention concerne aussi des barres et des tubes présentant de hautes caractéristiques mécaniques à l'état brut de laminage à chaud grâce à la combinaison d'une composition définie à l'intérieur de fourchettes précises et d'une structure à prédominance bainitique.The invention also relates to bars and tubes having high mechanical characteristics in the raw state of hot rolling by virtue of the combination of a composition defined within precise ranges and a predominantly bainitic structure.
De façon plus précise, l'invention concerne des barres ou tubes présentant des caractéristiques mécaniques au moins égales aux caractéristiques minimales du grade N80 de l'American Petroleum Institute, obtenues par une méthode d'élaboration et de transformation beaucoup plus économique que les méthodes habituellement utilisées.More specifically, the invention relates to bars or tubes having mechanical characteristics at least equal to the minimum characteristics of grade N80 of the American Petroleum Institute, obtained by a production and transformation method much more economical than the usual methods. used.
Les méthodes habituelles de fabrication de barres ou tubes présentant des caractéristiques mécaniques correspondant au grade N80 de l'American Petroleum Institute,consistent à élaborer un acier faiblement allié tel que l'acier suivant norme AFNOR 40MD7. Cet acier contient en Z én masse ; C 0,25 à 0,50 ; Mn 1,20 à 1,70 ; Mo 0,20 et les impuretés habituelles. Après coulée en lingots ou en barres de coulée continue, cet acier est transformé par laminage à chaud en barres de la section voulue, par exemple des barres rondes de 100 à 200 mm de diamètre. A l'état brut de laminage à chaud, ces barres ont généralement une limite élastique d'environ 750 MPa mais une résilience faible inférieure à 30 Joules/cm2, mesurée sur éprouvettes KCU.The usual methods of manufacturing bars or tubes having mechanical characteristics corresponding to grade N80 of the American Petroleum Institute, consist in developing a low-alloy steel such as steel according to standard AFNOR 40MD7. This steel contains Z en mass; C 0.25 to 0.50; Mn 1.20 to 1.70; Mo 0.20 and the usual impurities. After casting in ingots or in continuous casting bars, this steel is transformed by hot rolling into bars of the desired section, for example round bars from 100 to 200 mm in diameter. In the raw hot rolling state, these bars generally have an elastic limit of around 750 MPa but a low resilience of less than 30 Joules / cm2, measured on KCU test pieces.
Dans le but de leur conférer les caractéristiques mécaniques désirées, on leur fait alors subir un traitement thermique comportant un recuit d'àusténitisation à une température d'environ 875°C, suivi d'un refroidissement à l'air jusqu'au voisinage de la température ambiante et enfin, un revenu à une température d'environ 600 à 650°C.In order to give them the desired mechanical characteristics, they are then subjected to a heat treatment comprising an austenitization annealing at a temperature of about 875 ° C, followed by air cooling to around room temperature and finally an tempering at a temperature of about 600 to 650 ° C.
Les barres ainsi obtenues présentent des caractéristiques mécaniques conformes au grade N80, à savoir :
Ces opérations de traitement thermique après laminage sont coûteuses en temps de fabrication, en frais de manutention et de contrôlé ainsi qu'en énergie thermique et nécessitent, de plus, de disposer d'importantes installations spécialisées pour l'exécution de tels traitements.These post-lamination heat treatment operations are costly in terms of manufacturing time, handling and control costs as well as in thermal energy and also require the use of large specialized facilities for carrying out such treatments.
On a recherché la possibilité de mettre au point un procédé d'élaboration et de transformation appliqué à une composition particulière d'acier permettant d'obtenir à l'état brut de laminage à chaud, des barres présentant directement les caractéristiques mécaniques exigées par les utilisateurs. On a recherché aussi la possibilité de réaliser, à partir de ces barres, par perçage à chaud, puis laminage à chaud sur mandrin, des tubes présentant à l'état brut de laminage à chaud des caractéristiques mécaniques comparables à celles de ces barres.We looked for the possibility of developing an elaboration and transformation process applied to a particular steel composition making it possible to obtain, in the raw state of hot rolling, bars having directly the mechanical characteristics required by the users. . The possibility has also been sought of producing, from these bars, by hot drilling, then hot rolling on a mandrel, tubes having in the raw hot rolling state mechanical characteristics comparable to those of these bars.
On a recherché en particulier la possibilité d'obtenir à l'état brut de laminage à chaud des barres ou tubes présentant une limite d'élasticité E supérieure à 550 MPa associée à une résilience KCU supérieure à 80 J/cm 2 . Particular attention was paid to the possibility of obtaining, in the raw state of hot rolling, bars or tubes having an elastic limit E greater than 550 MPa associated with a resilience KCU greater than 80 J / cm 2 .
On a eu l'idée, suivant l'invention, d'élaborer un acier présentant la composition suivante en % en masse : C 0,060 à 0,120 et de préférence 0,080 à 0,110 ; Si 0,30 à 0,70 ; Mn 1,30 à 2,00 et de préférence 1,50 à 1,80 ; Nb 0,050 à 0,120 ; B 0,0025 à 0,0060 ; Al 0,040 à 0,080 ; N < 0,010 ; reste Fe et impuretés habituelles. Cet acier étant le plus souvent élaboré à partir de ferrailles peut contenir d'assez nombreuses impuretés métalliques telles que Ni, Cr, Cu et Mo, le total des impuretés métalliques ne dépassant pas environ 1%. Une addition éventuelle de V jusqu'à 0,12% peut également être effectuée. Il peut comporter aussi une addition de S juqu'à une teneur d'environ 0,040 à 0,070% pour améliorer l'usinabilité. On peut combiner avec cette addition de très petites additions de métaux alcalino-terreux tels que Ca et/ou Mg, et/ou de métaux des terres rares pour améliorer l'isotropie des caractéristiques mécaniques.We had the idea, according to the invention, of developing a steel having the following composition in% by mass: C 0.060 to 0.120 and preferably 0.080 to 0.110; If 0.30 to 0.70; Mn 1.30 to 2.00 and preferably 1.50 to 1.80; Nb 0.050 to 0.120; B 0.0025 to 0.0060; Al 0.040-0.080; N <0.010; remains Fe and usual impurities. This steel being most often produced from scrap metal can contain quite a number of metallic impurities such as Ni, Cr, Cu and Mo, the total of metallic impurities not exceeding about 1%. A possible addition of V up to 0.12% can also be carried out. It can also include an addition of S up to a content of about 0.040 to 0.070% to improve the machinability. It is possible to combine with this addition of very small additions of alkaline earth metals such as Ca and / or Mg, and / or of rare earth metals to improve the isotropy of the mechanical characteristics.
Après coulée sous forme de lingots ou de barres de coulée continue, l'acier est transformé dans des conditions contrôlées. Le dégrossissage des lingots, au blooming, est effectué de façon classique à une température d'environ 1200 à 1050°C. Les barres ainsi obtenues, ou bien les barres de coulée continue subissent un laminage contrôlé à une température comprise entre 1000et 700°C en une seule chaude jusqu'à l'obtention de barres de la:section voulue, circulaire ou non. Dans le cas du laminage de tubes, la barre brute de laminage à chaud est percée par perçage à chaud puis l'ébauche de tube obtenue est laminée à chaud sur mandrin jusqu'à la dimension désirée. Pour les barres comme pour les tubes, il peut être avantageux d'effectuer un revenu permettant de compléter la précipitation du Nb et dont l'intérêt principal est de relèver la limite d'élasticité. Ce revenu est de préférence effectué à une température comprise entre 550 et 700°C.After casting in the form of ingots or continuous casting bars, the steel is transformed under controlled conditions. The roughing of the ingots, during blooming, is carried out in a conventional manner at a temperature of approximately 1200 to 1050 ° C. The bars thus obtained, or else the continuous casting bars undergo a controlled rolling at a temperature between 1000 and 700 ° C. in a single hot operation until bars of the desired section are obtained, circular or not. In the case of tube rolling, the raw hot rolling bar is drilled by hot drilling and then the tube blank obtained is hot rolled on a mandrel to the desired dimension. For the bars as for the tubes, it can be advantageous to carry out an income allowing to complete the precipitation of Nb and whose main interest is to raise the elastic limit. This tempering is preferably carried out at a temperature between 550 and 700 ° C.
Les hautes caractéristiques mécaniques des produits obtenus par le procédé suivant l'invention résultent essentiellement de l'action de l'opération de laminage à chaud effectuée, dans des limites de température définies et avec un taux de corroyage bien déterminé, sur un acier dont la composition est à l'intérieur des limites précisées plus haut. Grâce à sa faible teneur en carbone, associée à une teneur en manganèse bien définie et à une combinaison d'additions de niobium, bore et aluminium, dans des proportions critiques, il est possible de supprimer les traitements classiques qui étaient considérés comme obligatoires pour obtenir ces caractéristiques mécaniques tout à fait particulières.The high mechanical properties of the products obtained by the process according to the invention essentially result from the action of the hot rolling operation carried out, within defined temperature limits and with a well-defined wrought rate, on a steel whose composition is within the limits specified above. Thanks to its low carbon content, associated with a well-defined manganese content and a combination of additions of niobium, boron and aluminum, in critical proportions, it is possible to eliminate the conventional treatments which were considered compulsory to obtain these very specific mechanical characteristics.
L'exemple non limitatif ci-après décrit un mode de mise en oeuvre du procédé suivant l'invention.The nonlimiting example below describes an embodiment of the method according to the invention.
On élabore un acier contenant en % en masse : C 0,085 ; Si 0,452 ; Mn 1,520 ; Nb 0,060 ; Al 0,071 ; B 0,0049 ; N 0,007 ; Ni 0,136 ; Cr 0,167 ; Cu 0,228 ; S 0,028 ; P 0,017 ; reste Fe et impuretés habituelles.A steel is produced containing in% by mass: C 0.085; If 0.452; Mn 1.520; Nb 0.060; Al 0.071; B 0.0049; N 0.007; Ni 0.136; Cr 0.167; Cu 0.228; S 0.028; P 0.017; remains Fe and usual impurities.
Cet acier est coulé en lingots de 5,8 tonnes. Ces lingots sont préchauffés à 1230°C, puis dégrossis au blooming en barres de 182 x 182 mm à une température comprise entre 1200 et 1050°C puis laminés de façon continue en barres rondes de diamètre 140 mm. La température d'entrée est d'environ 950°C et la température à la sortie de la dernière cage du laminoir est d'environ 710°C. On prélève sur ces barres, brutes de laminage à chaud, des éprouvettes de 10 mm de diamètre pour essais de traction ainsi que des éprouvettes pour mesures de résilience du type KCU sens long. Ces prélèvements sont faits à 25 mm de la surface (axe de l'éprouvette 0 10 mm situé à 25 mm au-dessous de cette surface).This steel is cast in 5.8-ton ingots. These ingots are preheated to 1230 ° C, then roughed out in blooming in 182 x 182 mm bars at a temperature between 1200 and 1050 ° C and then continuously rolled into 140 mm diameter round bars. The inlet temperature is approximately 950 ° C and the temperature at the outlet of the last stand of the rolling mill is approximately 710 ° C. 10 mm diameter test pieces for tensile tests as well as test pieces for resilience measurements of the long KCU type are taken from these bars, rough hot-rolled. These samples are taken 25 mm from the surface (axis of the test piece 0 10 mm located 25 mm below this surface).
Le tableau ci-après donne les caractéristiques mécaniques obtenues.
On voit que la limite élastique est supérieure à 550 MPa et que la résilience est supérieure à 80 J/cm2. Par ailleurs, les examens micrographiques montrent que la structure de la barre est homogène et à prédominance bainitique en tous points. Il est également possible d'appliquer le procédé suivant l'invention à la réalisation de barres de section autre que circulaire, telles que des barres carrées ou rectangulaires ou de section quelconque. Dans tous les cas, l'opération de laminage qui permet d'obtenir ces barres doit être effectuée à une température comprise entre 1000et 700°C et le taux de corroyage doit de préférence atteindre au moins 50X sans réchauffage intermédiaire.We see that the elastic limit is greater than 550 MPa and that the resilience is greater than 80 J / cm 2 . Furthermore, micrographic examinations show that the structure of the bar is homogeneous and predominantly bainitic in all points. It is also possible to apply the method according to the invention to the production of bars of section other than circular, such as square or rectangular bars or of any section. In all cases, the rolling operation which makes it possible to obtain these bars must be carried out at a temperature of between 1000 and 700 ° C. and the rate of working must preferably reach at least 50X without intermediate reheating.
Comme cela a été dit plus haut, il est possible d'accroître encore la limite élastique des barres brutes de laminage à chaud en leur faisant subir un revenu à une température de préférence comprise entre 550 et 700°C.As mentioned above, it is possible to further increase the elastic limit of the raw hot rolling bars by subjecting them to tempering at a temperature preferably between 550 and 700 ° C.
Claims (10)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT82420154T ATE20479T1 (en) | 1982-04-22 | 1982-11-15 | PROCESSES FOR THE MANUFACTURE OF RODS AND TUBES FROM STEEL WITH HIGH MECHANICAL PROPERTIES. |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR8207281A FR2525503B1 (en) | 1982-04-22 | 1982-04-22 | |
| FR8207281 | 1982-04-22 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0092629A1 true EP0092629A1 (en) | 1983-11-02 |
| EP0092629B1 EP0092629B1 (en) | 1986-06-18 |
Family
ID=9273468
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP82420154A Expired EP0092629B1 (en) | 1982-04-22 | 1982-11-15 | Process for the manufacture of rods and tubes from steels with great mechanical properties |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US4474627A (en) |
| EP (1) | EP0092629B1 (en) |
| JP (1) | JPS591656A (en) |
| AT (1) | ATE20479T1 (en) |
| CA (1) | CA1198614A (en) |
| DE (1) | DE3271793D1 (en) |
| FR (1) | FR2525503B1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0370588A1 (en) * | 1988-09-16 | 1990-05-30 | MANNESMANN Aktiengesellschaft | Method for producing high-strength seamless steel pipes |
| FR2727981A1 (en) * | 1994-12-13 | 1996-06-14 | Ascometal Sa | PROCESS FOR MANUFACTURING A STEEL PIECE OF MECHANICAL CONSTRUCTION AND PIECE SO MANUFACTURED |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2135255C (en) * | 1994-05-26 | 2000-05-16 | William E. Heitmann | Cold deformable, high strength, hot rolled bar and method for producing same |
| JP5229823B2 (en) * | 2009-09-25 | 2013-07-03 | 株式会社日本製鋼所 | High-strength, high-toughness cast steel and method for producing the same |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2187922A1 (en) * | 1972-06-13 | 1974-01-18 | Sumitomo Metal Ind | |
| SU522261A1 (en) * | 1975-03-25 | 1976-07-25 | Центральный научно-исследовательский институт черной металлургии им.И.П.Бардина | Low alloy steel |
| FR2400067A1 (en) * | 1977-08-12 | 1979-03-09 | Kawasaki Steel Co | STEEL WITH HIGH RESISTANCE TO CRACKING CAUSED BY HYDROGEN |
| GB2019439A (en) * | 1978-04-05 | 1979-10-31 | Nippon Steel Corp | Process for producing high-tension bainitic steel having high toughness and excellent weldability |
Family Cites Families (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2513240A (en) * | 1949-01-10 | 1950-06-27 | Wheeling Steel Corp | Welded steel pipe |
| FR1515961A (en) * | 1965-10-26 | 1968-03-08 | Fuji Iron & Steel Co Ltd | Manufacturing processes of high notch resistance steel for welded structures and new products thus obtained |
| NL170159C (en) * | 1973-06-04 | 1982-10-01 | Estel Hoogovens Bv | METHOD FOR MANUFACTURING WELDABLE LOW CARBON STEEL MATERIAL BY CONTROLLED COOLING |
| JPS5420931B2 (en) * | 1973-09-10 | 1979-07-26 | ||
| BE829089A (en) * | 1975-05-14 | 1975-11-14 | STEEL BOLT, HIGH ELASTIC LIMIT | |
| JPS52152814A (en) * | 1976-06-14 | 1977-12-19 | Nippon Steel Corp | Thermo-mechanical treatment of seamless steel pipe |
| DE2635188A1 (en) * | 1976-08-05 | 1978-02-09 | Bosch Gmbh Robert | High tensile, cold headed bolts, screws etc. - made from patented rod or wire and then tempered |
| JPS5375114A (en) * | 1976-12-17 | 1978-07-04 | Nippon Steel Corp | Manufacture of structural steel |
| JPS5397922A (en) * | 1977-02-08 | 1978-08-26 | Nippon Kokan Kk <Nkk> | Manufacture of non-refined high tensile steel |
| JPS55107726A (en) * | 1979-02-07 | 1980-08-19 | Nippon Steel Corp | Production of steel material of superior rupture characteristic |
| JPS5853708B2 (en) * | 1979-03-15 | 1983-11-30 | 住友金属工業株式会社 | Welded steel pipe with excellent butt toughness |
| JPS56166324A (en) * | 1980-05-23 | 1981-12-21 | Kawasaki Steel Corp | Production of high-strength seamless steel pipe of good weldability for middle temperature region |
| JPS5945749B2 (en) * | 1980-07-17 | 1984-11-08 | 住友金属工業株式会社 | Steel material for pipes |
| US4354882A (en) * | 1981-05-08 | 1982-10-19 | Lone Star Steel Company | High performance tubulars for critical oil country applications and process for their preparation |
| US4370178A (en) * | 1981-06-30 | 1983-01-25 | Republic Steel Corporation | Method of making as-pierced tubular products |
-
1982
- 1982-04-22 FR FR8207281A patent/FR2525503B1/fr not_active Expired
- 1982-11-15 EP EP82420154A patent/EP0092629B1/en not_active Expired
- 1982-11-15 DE DE8282420154T patent/DE3271793D1/en not_active Expired
- 1982-11-15 AT AT82420154T patent/ATE20479T1/en active
- 1982-11-18 US US06/442,661 patent/US4474627A/en not_active Expired - Lifetime
- 1982-11-29 CA CA000416561A patent/CA1198614A/en not_active Expired
-
1983
- 1983-04-21 JP JP58070866A patent/JPS591656A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2187922A1 (en) * | 1972-06-13 | 1974-01-18 | Sumitomo Metal Ind | |
| SU522261A1 (en) * | 1975-03-25 | 1976-07-25 | Центральный научно-исследовательский институт черной металлургии им.И.П.Бардина | Low alloy steel |
| FR2400067A1 (en) * | 1977-08-12 | 1979-03-09 | Kawasaki Steel Co | STEEL WITH HIGH RESISTANCE TO CRACKING CAUSED BY HYDROGEN |
| GB2019439A (en) * | 1978-04-05 | 1979-10-31 | Nippon Steel Corp | Process for producing high-tension bainitic steel having high toughness and excellent weldability |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0370588A1 (en) * | 1988-09-16 | 1990-05-30 | MANNESMANN Aktiengesellschaft | Method for producing high-strength seamless steel pipes |
| FR2727981A1 (en) * | 1994-12-13 | 1996-06-14 | Ascometal Sa | PROCESS FOR MANUFACTURING A STEEL PIECE OF MECHANICAL CONSTRUCTION AND PIECE SO MANUFACTURED |
| EP0717116A1 (en) * | 1994-12-13 | 1996-06-19 | ASCOMETAL (Société anonyme) | Process for producing a work piece of machine construction steel and work piece produced by this process |
Also Published As
| Publication number | Publication date |
|---|---|
| EP0092629B1 (en) | 1986-06-18 |
| ATE20479T1 (en) | 1986-07-15 |
| FR2525503A1 (en) | 1983-10-28 |
| US4474627A (en) | 1984-10-02 |
| FR2525503B1 (en) | 1984-07-13 |
| JPS591656A (en) | 1984-01-07 |
| CA1198614A (en) | 1985-12-31 |
| DE3271793D1 (en) | 1986-07-24 |
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