EP0181791B1 - Low-alloyed manganese steel for bicycle frame tubes, a frame tube produced and process for its manufacture - Google Patents
Low-alloyed manganese steel for bicycle frame tubes, a frame tube produced and process for its manufacture Download PDFInfo
- Publication number
- EP0181791B1 EP0181791B1 EP85401924A EP85401924A EP0181791B1 EP 0181791 B1 EP0181791 B1 EP 0181791B1 EP 85401924 A EP85401924 A EP 85401924A EP 85401924 A EP85401924 A EP 85401924A EP 0181791 B1 EP0181791 B1 EP 0181791B1
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- EP
- European Patent Office
- Prior art keywords
- less
- low
- manganese
- manufacture
- tubes
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
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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
Definitions
- the present invention relates to the use of a steel lightly alloyed with manganese for the manufacture of thin tubes cold drawn and in particular of tubes of cycle frames.
- AFNOR 20M5 a steel weakly alloyed with manganese, the composition of which is by weight: 0.16 to 0.22% of carbon, 1.10 to 1.40% of manganese, 0.15 to 0, 35% silicon, less than 0.035% phosphorus, less than 0.035% sulfur, the balance being formed by iron and the usual impurities.
- Steels of the aforementioned type are used for tubes of cycle frames. These steels must be able to be brazed when the frames are manufactured. We seek to lighten the frames as much as possible and we need steels with maximum tensile strength.
- Structural steels which contain, in addition to manganese, a certain proportion of vanadium generally close to 0.10% or slightly higher.
- Steels are also known whose composition is as follows: C ⁇ 0.20% (preferably : 50.18%), Mn 0.90-1.60%, Si 0.10-0.50%, P s0, 040% (preferably ⁇ 0.030%), S ⁇ 0.040% (preferably : 50.030%), AI preferably? 0.015%, Fe the balance.
- These steels the subject of document Werkstoffblatt 240R, Ausgabe Juli 1974, der Mannesmannrôhren-Werke AG, 4-Düsseldorf, Postfach 1104, are used for the manufacture of tubes.
- such structural steels have never been used for the manufacture of cold drawn seamless tubes for cycle frames and their structures and properties have never been adapted for such use in the form of thin tubes which can be brazed for the manufacture of cycle frames.
- the object of the invention is therefore to propose the use, for the manufacture of cold-drawn seamless tubes for cycle frames, of a steel low in alloy with manganese consisting, by weight, of 0.16 to 0.20 % carbon, 1.20-1.50% manganese, 0.15-0.50% silicon, up to 0.035% phosphorus, up to 0.035% sulfur, up to 0.20% nickel, up to 0.20% chromium, up to 0.05% molybdenum, 0.050 to 0.075% vanadium, less than 0.10% copper and 0.010% tin, possibly 0.007 to 0.030% of aluminum, the balance being formed by iron and the usual impurities, the proportion of which is kept at a very low level, the steel having, after standardization treatment, a fine structure with dispersoids and a tensile strength greater than 700 N / mm 2.
- the steel according to the invention requires a specific production method which makes it possible to limit the content of impurities and residual elements to a minimum.
- phosphorus and sulfur are limited to very low values of less than 0.035% and preferably less than 0.025%.
- steel is produced by conversion to oxygen of a hematite cast iron, with stirring of the bath with an inert gas.
- the steel obtained is then cast by the rotary continuous casting process, in the form of round bars which thus have remarkable properties for the manufacture of seamless tubes.
- composition targeted for the steel is as follows: carbon 0.18%, silicon 0.35%, manganese 1.30%, vanadium 0.060%, phosphorus and sulfur: less than 0.025%.
- Aluminum can be added in the form of wires, in an ingot mold, the targeted aluminum content being 0.020%. An aluminum content of between 0.007 and 0.030% will however be accepted. Aluminum stabilizes the fine-grained structure of steel, without having a deoxidizing role.
- the steel according to the invention must contain: carbon 0.16 to 0.19%, silicon 0.33 to 0.40%, manganese 1.28 to 1 , 35%, vanadium 0.050 to 0.070%, aluminum 0.010 to 0.030%, phosphorus and sulfur: less than 0.25%.
- chromium must be limited to 0.20%, nickel to 0.20% and molybdenum to 0.050%.
- the steel may also contain residual elements such as copper and tin in tolerated contents of less than 0.10% and 0.010% respectively.
- samples are taken from certain portions of the casting bar, these samples then being forged and subjected to an analysis of their composition and also to a micrographic examination. Tensile strength is also measured on forged samples.
- the tensile strength is close to 800 N / mm 2. This resistance compares very favorably with the tensile strength obtained with steels of the 20M5 type after quenching and tempering, this resistance being of the order of 620 N / mm 2 .
- the continuous casting bar is cut into sections with a minimum length of 2 m and then cooled.
- the tube rings obtained can then be reheated and then transformed into seamless tubes by rolling. These tubes undergo a normalization treatment near 900 ° which makes it possible to develop a fine dispersoid structure and a tensile strength of the order of 800 N / mm 2.
- the cycle tubes obtained have a very high resistance to fatigue and good brazing properties, due to the fact that they allow overheating of up to 1100 ° C. without altering their mechanical properties. .
Description
La présente invention concerne l'utilisation d'un acier faiblement allié au manganèse pour la fabrication de tubes de faible épaisseur étirés à froid et en particulier de tubes de cadres de cycles.The present invention relates to the use of a steel lightly alloyed with manganese for the manufacture of thin tubes cold drawn and in particular of tubes of cycle frames.
On connaît, sous la dénomination AFNOR 20M5, un acier faiblement allié au manganèse dont la composition est en poids: 0,16 à 0,22% de carbone, 1,10 à 1,40% de manganèse, 0,15 à 0,35% de silicium, moins de 0,035% de phosphore, moins de 0,035% de soufre, le solde étant formé par le fer et les impuretés habituelles.We know, under the name AFNOR 20M5, a steel weakly alloyed with manganese, the composition of which is by weight: 0.16 to 0.22% of carbon, 1.10 to 1.40% of manganese, 0.15 to 0, 35% silicon, less than 0.035% phosphorus, less than 0.035% sulfur, the balance being formed by iron and the usual impurities.
On utilise des aciers du type précité pour des tubes de cadres de cycles. Ces aciers doivent pouvoir être brasés au moment de la fabrication des cadres. On cherche à alléger au maximum les cadres et on a besoin d'aciers dont la résistance à la traction est maximum.Steels of the aforementioned type are used for tubes of cycle frames. These steels must be able to be brazed when the frames are manufactured. We seek to lighten the frames as much as possible and we need steels with maximum tensile strength.
On connaît également des aciers de construction qui renferment outre du manganèse, une certaine proportion de vanadium généralement voisine de 0,10% ou un peu supérieure. On connaît également des aciers dont la composition est la suivante: C <0,20% (préférablement :50,18%), Mn 0,90-1,60%, Si 0,10-0,50%, P s0,040% (préférablement ≤0,030%), S ≤0,040% (préférablement :50,030%), AI préférablement ?0,015%, Fe le solde. Ces aciers faisant l'objet du document Werkstoffblatt 240R, Ausgabe Juli 1974, der Man- nesmannrôhren-Werke AG, 4-Düsseldorf, Post- fach 1104, sont utilisés pour la fabrication de tubes. De tels aciers de construction n'ont cependant jamais été utilisés pour la fabrication de tubes sans soudure étirés à froid pour cadres de cycles et leurs structures et propriétés n'ont jamais été adaptées à une telle utilisation sous forme de tubes minces pouvant être brasés pour la fabrication de cadres de cycles.Structural steels are also known which contain, in addition to manganese, a certain proportion of vanadium generally close to 0.10% or slightly higher. Steels are also known whose composition is as follows: C <0.20% (preferably : 50.18%), Mn 0.90-1.60%, Si 0.10-0.50%, P s0, 040% (preferably ≤0.030%), S ≤0.040% (preferably : 50.030%), AI preferably? 0.015%, Fe the balance. These steels, the subject of document Werkstoffblatt 240R, Ausgabe Juli 1974, der Mannesmannrôhren-Werke AG, 4-Düsseldorf, Postfach 1104, are used for the manufacture of tubes. However, such structural steels have never been used for the manufacture of cold drawn seamless tubes for cycle frames and their structures and properties have never been adapted for such use in the form of thin tubes which can be brazed for the manufacture of cycle frames.
Le but de l'invention est donc de proposer l'utilisation, pour la fabrication de tubes sans soudure étirés à froid pour cadres de cycles, d'un acier faiblement allié au manganèse constitué, en poids, de 0,16 à 0,20% de carbone, 1,20 à 1,50% de manganèse, 0,15 à 0,50% de silicium, jusqu'à 0,035% de phosphore, jusqu'à 0,035% de soufre, jusqu'à 0,20% de nickel, jusqu'à 0,20% de chrome, jusqu'à 0,05% de molybdène, 0,050 à 0,075% de vanadium, moins de 0,10% de cuivre et de 0,010% d'étain, éventuellement 0,007 à 0,030% d'aluminium, le solde étant formé par le fer et les impuretés habituelles dont la proportion est maintenue à un niveau très bas, l'acier présentant, après traitement de normalisation, une structure fine à dispersoides et une résistance à la traction supérieure à 700 N/mm2. The object of the invention is therefore to propose the use, for the manufacture of cold-drawn seamless tubes for cycle frames, of a steel low in alloy with manganese consisting, by weight, of 0.16 to 0.20 % carbon, 1.20-1.50% manganese, 0.15-0.50% silicon, up to 0.035% phosphorus, up to 0.035% sulfur, up to 0.20% nickel, up to 0.20% chromium, up to 0.05% molybdenum, 0.050 to 0.075% vanadium, less than 0.10% copper and 0.010% tin, possibly 0.007 to 0.030% of aluminum, the balance being formed by iron and the usual impurities, the proportion of which is kept at a very low level, the steel having, after standardization treatment, a fine structure with dispersoids and a tensile strength greater than 700 N / mm 2.
D'autres caractéristiques et avantages de l'invention ressortiront de la description qui va suivre.Other characteristics and advantages of the invention will emerge from the description which follows.
L'acier suivant l'invention nécessite une méthode d'élaboration particulière qui permette de limiter à un minimum la teneur en impuretés et en éléments résiduels. En particulier, le phosphore et le soufre sont limités à des valeurs très faibles inférieures à 0,035% et de préférence inférieures à 0,025%. Pour cela, l'acier est élaboré par conversion à l'oxygène d'une fonte hématite, avec brassage du bain par un gaz inerte.The steel according to the invention requires a specific production method which makes it possible to limit the content of impurities and residual elements to a minimum. In particular, phosphorus and sulfur are limited to very low values of less than 0.035% and preferably less than 0.025%. For this, steel is produced by conversion to oxygen of a hematite cast iron, with stirring of the bath with an inert gas.
L'acier obtenu est ensuite coulé par le procédé de la coulée continue rotative, sous forme de barres rondes qui possèdent ainsi des propriétés remarquables pour la fabrication de tubes sans soudure.The steel obtained is then cast by the rotary continuous casting process, in the form of round bars which thus have remarkable properties for the manufacture of seamless tubes.
La composition visée pour l'acier est la suivante: carbone 0,18%, silicium 0,35%, manganèse 1,30%, vanadium 0,060%, phosphore et soufre: inférieurs à 0,025%.The composition targeted for the steel is as follows: carbon 0.18%, silicon 0.35%, manganese 1.30%, vanadium 0.060%, phosphorus and sulfur: less than 0.025%.
De l'aluminium peut être ajouté sous forme de fils, en lingotière, la teneur visée en aluminium étant de 0,020%. On admettera cependant une teneur en aluminium comprise entre 0,007 et 0,030%. L'aluminium permet de stabiliser la structure à grains fins de l'acier, sans avoir de rôle désoxydant.Aluminum can be added in the form of wires, in an ingot mold, the targeted aluminum content being 0.020%. An aluminum content of between 0.007 and 0.030% will however be accepted. Aluminum stabilizes the fine-grained structure of steel, without having a deoxidizing role.
De façon préférentielle, par rapport aux intervalles un peu plus large donnés, l'acier selon l'invention doit contenir: carbone 0,16 à 0,19%, silicium 0,33 à 0,40%, manganèse 1,28 à 1,35%, vanadium 0,050 à 0,070%, aluminium 0,010 à 0,030%, phosphore et soufre: inférieurs à 0,25%.Preferably, with respect to the slightly wider intervals given, the steel according to the invention must contain: carbon 0.16 to 0.19%, silicon 0.33 to 0.40%, manganese 1.28 to 1 , 35%, vanadium 0.050 to 0.070%, aluminum 0.010 to 0.030%, phosphorus and sulfur: less than 0.25%.
De plus, le chrome doit être limité à 0,20%, le nickel à 0,20% et le molybdène à 0,050%.In addition, chromium must be limited to 0.20%, nickel to 0.20% and molybdenum to 0.050%.
L'acier peut en outre contenir des éléments résiduels tels que le cuivre et l'étain dans des teneurs tolérées inférieures à 0,10% et 0,010% respecive- ment.The steel may also contain residual elements such as copper and tin in tolerated contents of less than 0.10% and 0.010% respectively.
Pour contrôler l'élaboration et l'obtention des propriétés mécaniques souhaitées, on prélève des échantillons sur certaines portions de la barre coulée, ces échantillons étant ensuite forgés et étant soumis à une analyse de leur composition et ainsi qu'à un examen micrographique. La résistance à la traction est également mesurée sur les échantillons forgés.To control the development and obtaining of the desired mechanical properties, samples are taken from certain portions of the casting bar, these samples then being forged and subjected to an analysis of their composition and also to a micrographic examination. Tensile strength is also measured on forged samples.
Dans le cas d'un acier selon l'invention à 0,18% de carbone, 0,35% de silicium, 1,3% de manganèse, 0,060% de vanadium et 0,020% d'aluminium, on observe sur les échantillons forgés, , après normalisation à 900 °C et refroidissement à l'air, une structure très fine à dispersoïdes qui permet l'obtention des caractéristiques mécani- . ques souhaitables.In the case of a steel according to the invention with 0.18% carbon, 0.35% silicon, 1.3% manganese, 0.060% vanadium and 0.020% aluminum, observed on the forged samples ,, after normalization to 900 ° C and air cooling, a very fine structure with dispersoids which makes it possible to obtain the mechanical characteristics. only desirable.
La résistance à la traction est voisine de 800 N/ mm2. Cette résistance se compare très favorablement à la résistance à la traction obtenue avec les aciers du type 20M5 après trempe et revenu, cette résistance étant de l'ordre de 620 N/mm2.The tensile strength is close to 800 N / mm 2. This resistance compares very favorably with the tensile strength obtained with steels of the 20M5 type after quenching and tempering, this resistance being of the order of 620 N / mm 2 .
Les aciers qui ont des teneurs en éléments d'alliage comprises dans les intervalles revendiqués, présentent, après traitement de normalisation, une résistance à la traction qui n'est jamais inférieure à 700-710 N/mm2.The steels which have contents of alloying elements included in the ranges claimed, exhibit, after standardization treatment, a tensile strength which is never less than 700-710 N / mm 2 .
Pour la production de tubes de cadres de cycles, la barre coulée en continue est découpée sous forme de tronçons d'une longueur minimale de 2 m puis refroidie.For the production of cycle frame tubes, the continuous casting bar is cut into sections with a minimum length of 2 m and then cooled.
Les ronds à tube obtenus peuvent être par la suite réchauffés puis transformés en tubes sans soudure par laminage. Ces tubes subissent un traitement de normalisation au voisinage de 900° qui permet de développer une structure fine à dispersoïdes et une résistance à la traction de l'ordre de 800 N/mm2. The tube rings obtained can then be reheated and then transformed into seamless tubes by rolling. These tubes undergo a normalization treatment near 900 ° which makes it possible to develop a fine dispersoid structure and a tensile strength of the order of 800 N / mm 2.
Ces tubes sans soudure sont ensuite étirés à froid pour être transformés en tubes minces de cadres de cycles. L'augmentation considérable de la résistance à la traction de l'acier permet d'alléger les tubes, à résistance égale. Cet allègement est un avantage appréciable dans le cas de la fabrication de cycles de faible poids.These seamless tubes are then cold drawn to be made into thin tubes of cycle frames. The considerable increase in the tensile strength of steel makes it possible to lighten the tubes, with equal resistance. This reduction is an appreciable advantage in the case of the manufacture of light weight cycles.
Outre leur très bonne résistance à la traction, les tubes de cycles obtenus ont une très grande résistance à la fatigue et de bonnes propriétés de brasage, du fait qu'ils permettent des surchauffes allant jusqu'à 1100 °C sans altération de leurs propriétés mécaniques.In addition to their very good tensile strength, the cycle tubes obtained have a very high resistance to fatigue and good brazing properties, due to the fact that they allow overheating of up to 1100 ° C. without altering their mechanical properties. .
Ces propriétés font de cet acier un matériau de grande qualité pour la construction des cadres de cycles.These properties make this steel a high quality material for the construction of cycle frames.
Claims (3)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR8415664 | 1984-10-12 | ||
| FR8415664A FR2571740B1 (en) | 1984-10-12 | 1984-10-12 | MANGANESE STEEL FOR, IN PARTICULAR, CYCLE TUBES |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0181791A1 EP0181791A1 (en) | 1986-05-21 |
| EP0181791B1 true EP0181791B1 (en) | 1990-01-10 |
Family
ID=9308602
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP85401924A Expired - Lifetime EP0181791B1 (en) | 1984-10-12 | 1985-10-02 | Low-alloyed manganese steel for bicycle frame tubes, a frame tube produced and process for its manufacture |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0181791B1 (en) |
| DE (1) | DE3575312D1 (en) |
| FR (1) | FR2571740B1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102005046459B4 (en) * | 2005-09-21 | 2013-11-28 | MHP Mannesmann Präzisrohr GmbH | Process for the production of cold-finished precision steel tubes |
| CN105734405A (en) * | 2016-03-23 | 2016-07-06 | 攀钢集团成都钢钒有限公司 | Seamless steel tube for high pressure hydrogenation device and production method thereof |
-
1984
- 1984-10-12 FR FR8415664A patent/FR2571740B1/en not_active Expired
-
1985
- 1985-10-02 EP EP85401924A patent/EP0181791B1/en not_active Expired - Lifetime
- 1985-10-02 DE DE8585401924T patent/DE3575312D1/en not_active Expired - Fee Related
Non-Patent Citations (6)
| Title |
|---|
| STAHLSCHLÜSSEL, édition 10, 1974, Verlag Stahlschlüssel Wegst K.G., page 109, réf. 76, STAS 500 * |
| STAHLSCHLÜSSEL, édition 13, 1983, Verlag Stahlschlüssel Wegst K.G., page 133, réf. 228, GOST 19282 * |
| STAHLSCHLÜSSEL, édition 13, 1983, Verlag Stahlschlüssel Wegst K.G., page 134, réf. 290, GOST 977 * |
| STAHLSCHLÜSSEL, édition 13, 1983, Verlag Stahlschlüssel Wegst K.G., page 90, réf. 110, AFNOR 20M5 * |
| THE MAKING, SHAPING AND TREATING OF STEEL, édition 9, 1971, United States Steel, pages 890-897, 905-907 * |
| Werkstoffblatt 240R, Juli 1974, Mannesmannröhren-Werke AG, Düsseldorf * |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2571740A1 (en) | 1986-04-18 |
| DE3575312D1 (en) | 1990-02-15 |
| EP0181791A1 (en) | 1986-05-21 |
| FR2571740B1 (en) | 1988-05-06 |
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