• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    1. A METHOD OF MANUFACTURING PROFILES FROM LOW-DEFINED DISPERSION-TENDER STEELS, mainly pipes, including hot rolling on a strip or sheet with the end of rolling Ac-, cooling, cutting, molding and welding, characterized by those. that, in order to increase the technological plasticity of the billet and the strength properties of the finished pipe, the strip or sheet from the end temperature is rolled, cooled immediately, and after molding and welding, the pipe is heated to Ac, CU, maintained, punctured by reducing the stretch and cooled in air. 2 .. The method according to claim 1, wherein the cooling of the strip is carried out in the coiled roll. 3. The method according to claim 1, characterized in that the slow cooling of the sheet is carried out in an oven. 4. A method according to claim 1, characterized by the fact that in the process of cooling the pipe in air from the end temperature of the rolling, by tempering the stretching, the tempering is performed at 500-600 ° C. vl 00
    公开号:SU1087078A3
    申请号:SU792858051
    申请日:1979-12-26
    公开日:1984-04-15
    发明作者:Грос Хайнц；Райт Фридрих；Ретцлафф Фридхельм；Хайнц Шлуснус Карл
    申请人:Хеш Верке Аг (Фирма)；
    IPC主号:
    专利说明:

    The invention relates to a method for producing profiles, preferably pipes. Profiles with high strength characteristics are used in cases when high strength structural elements with low mass are needed, for example, for children, hydraulic cylinders, steel high-rise structures, or when high loads are inevitable with structural limitation, for example drilling equipment in the oil industry. In the manufacture, for example, of hot-rolled seamless pipes, steels with an increased (up to 0.5%) carbon content, as well as other alloying additives are used, increasing 1C {mi strength. In the manufacture of welded tubular profiles to be molded from strip or sheet material, the use of such steels is difficult due to high resistance to deformation and insufficient weldability. The deterioration of high-frequency saarka conditions can be avoided both by using steels hardened and tempered after hot rolling, and by using unlike normalized fine-grained structural steels with increased yield strengths. Such a material has the necessary strength, but is not suitable for cold processing into profiles due to its high resistance to deformation. In practice, these qualities result in the manufacture of, for example, welded pipes, to limit the yield strength of the profiles to 500 MPa and the tensile strength to 650 MPa. In this connection, the pipes should be molded, boiled from soft grades of strip or sheet material with a yield strength of up to 500 MPa, and with higher demands on the yield strength, improved by quenching and subsequent tempering. A known method for manufacturing pipes, including hot rolling a billet of low-alloyed dispersion-hardening steel according to a controlled rolling scheme, after which the strip from the rolling end temperature is rapidly cooled to 620-560 ° C, is wound into a coil, in which it is cooled slowly. A pipe is formed from the obtained strip and the joint venture is welded. However, the resulting strip has improved strength properties, which makes it difficult to shape the pipe. The closest in technical essence to the present invention is a method for manufacturing pipes from low-alloyed dispersion-hardening steel, including hot rolling to a strip or sheet with the end of rolling above A, cooling, cutting, molding, welding and heat treatment — double normalization or quenching with high tempering C However, the blank strip has a low technological plasticity, which impairs cutting, grooving and forming. In addition, it is necessary to conduct a hardening heat treatment. The purpose of the invention is to increase the technological plasticity of the workpiece and the strength properties of the finished pipe. This goal is achieved by the fact that according to the method of producing profiles of low-alloyed dispersion-hardness steels, mainly pipes, including hot rolling onto a strip or sheet with rolling finished above Ar, cooling, cutting, molding and welding, the strip or sheet from the rolling end temperature is cooled slowly to , and after molding and welding, the pipe is heated to Acj 100-150 ° C, held, rolled, reduced by stretching, and cooled in air. Slow cooling of the strip is carried out in a coiled roll. Slow cooling of the sheet is carried out in an oven. In the process of cooling the pipe in air from the end of rolling temperature, by reducing the stretching, tempering is performed at 500-600 ° C. The method is carried out as follows. The strip or sheet of low-alloyed dispersion hardened steel after the last pass for aging is cooled slowly in a hot state from the temperature of the end of rolling above Ag to the temperature of about and finally it is cooled to room temperature. The strip or sheet is cold-processed into a pipe. In order to dissolve coarse precipitates, the pipe is subjected to high-temperature, aged heating, rolling by reducing by stretching, and cooling in air to form finely dispersed precipitates of carbides, nitrides, and carbonitrides. For the manufacture of pipes use low-alloy steel of the following composition,%: Carbon 0.13-0.35 Silicon 0.1-0.8 Manganese 0.9-1.7 Phosphorus Not more than 0.035 Sulfur Not more than 0.035 Copper Not more than 0.7 Nickel Not more than 0.8 Nitrogen Not more than 0.02 Aluminum Not more than 0.08 Niobium and / or titanium and / or vanadium 0.02-0.2 Iron and common impurities Else According to the proposed method, keeping in a hot state for the purpose of aging is dispersion-hardening fine-grained steel, in which no grinding of grain takes place during the cooling of the temperature above Ab-, j and 850-750 C, coiled, roll steel strip. Due to the relatively high temperatures of the strip during coiling and subsequent cooling, only as a result of natural thermal radiation from the coil, a slower cooling rate is achieved, thereby eliminating fine dispersion and coagulated precipitates. The corresponding formation of the structure in the sheets is achieved by cooling in the furnace with the temperature of the rolling end, as a result of which radiation and convection are prevented. Both for the coiled strip and for the steel sheet, it is essential that cooling to temperatures of 400 ° C occurs slowly, while Subsequent cooling to room temperature can be carried out in any way. Because they are reached by keeping the low resistance in hot condition, the deformers of a steel strip or sheet can easily be cold-processed into a pipe, i.e. cut, trim, mold, calibrate and weld. The manufactured pipes are heated to a temperature ACj of 100-150 ° C and held to dissolve the rough imperfections of the hardening phases, and then rolled by reducing to the required size and cooled in air. Air cooling ensures the release of finely divided carbide or carbonitride nitrides and, consequently, an increase in the strength properties of the finished tubes. Pipes from steel, in which the separation of dispersed particles of hardening phases most fully occurs at 500-600 s, during cooling in air should be subjected to tempering at the indicated temperatures. Example. For the manufacture of pipes using steel of the following chemical composition,%: carbon 0.28, manganese 1.5, silicon 0.32, sulfur-0.015, phosphorus 0.025, aluminum 0.03, vanadium 0.12, nitrogen 0.015, iron and inevitable impurities the rest. After hot rolling into a wide strip without intermediate cooling after the last pass, it is wound at a temperature of about 750 s into a coil and cooled in calm air to 400 C. With this cooling of the coil from coiling temperature to 400 ° C, the natural ability of the coil to accumulate heat for aging is used. in which there is a complete release and coagulation of carbides, nitrides and carbonitrides. Further cooling to room temperature is carried out in any way. The strip, after being completely cooled to room temperature or after aging, has a yield strength of 455 Sha and a tensile strength of 650 Sha.
    The hot-rolled, wide strip is cut into individual strips, if necessary, cut the edge and then cold-molded. Then using a high-frequency welding machine is welded to a pipe with a diameter of 159 mm.
    This tube is heated to a temperature / SWF with, held in and rolled by reducing to a desired diameter of 60.3 mm. The finished tube is cooled on the refrigerator to room temperature.
    During the heating of the pipe at the rolling tegoteurature level, coarse carbides, nitrides, and carbonitride steels dissolve and during cooling after rolling and tempering are finely dispersed with the simultaneous formation of fine grain.
    After this treatment, the finished pipe has a yield strength of 648 MPa and a tensile strength of 845 MPa.
    权利要求:
    Claims (4)
    [1]
    1. METHOD FOR PRODUCING PROFILES FROM LOW-ALLOYED DISPERSION-HARDING STEELS, mainly pipes, including hot rolling into a strip or sheet with the end of rolling above, cooling, cutting, molding and welding, characterized in that, in order to increase the technological plasticity of the workpiece and the strength strip or sheet with a final rolling temperature * sustained cooled to 400 ° C, and after forming and welding the pipe is heated to Ac 3100150 ° C, aged, rolled by reducing stretching and cooled in at spirit.
    [2]
    2. The method according to p. 1, about l and - especially with the fact that the delayed cooling of the strip is carried out in a coiled roll.
    [3]
    3. The method of pop. 1, characterized in that the delayed cooling of the sheet is carried out in a furnace.
    [4]
    4. The method of pop. ^ characterized in that in the process of cooling the pipe in air from the temperature of the end of rolling by reduction by stretching, tempering is carried out at 500-600 ° C.
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    同族专利:
    公开号 | 公开日
    JPS5591941A|1980-07-11|
    DE2900022B2|1981-02-26|
    ES487392A1|1980-09-16|
    DE2900022A1|1980-07-03|
    NO151295C|1985-03-13|
    MX152698A|1985-10-15|
    US4414042A|1983-11-08|
    NO151295B|1984-12-03|
    EP0013331B1|1982-09-15|
    GR66519B|1981-03-24|
    US4732623A|1988-03-22|
    DE2900022C3|1981-12-03|
    CA1125150A|1982-06-08|
    NO794340L|1980-07-03|
    EP0013331A1|1980-07-23|
    RO80871A|1983-02-01|
    引用文献:
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    DE1184509B|1960-01-21|1964-12-31|Hoesch Ag|The use of steel sheets or strips for the production of, in particular, screw-seam welded pipes|
    DE1234995B|1961-04-27|1967-02-23|Thyssen Roehrenwerke Ag|Use of steels that transform in the ferrite-pearlite stage|
    AT260980B|1964-02-18|1968-04-10|Indugas Ges Fuer Ind Gasverwen|Device for heating or heat treatment of pipes|
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    US3673007A|1968-11-29|1972-06-27|Japan Steel Works Ltd|Method for manufacturing a high toughness steel without subjecting it to heat treatment|
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    DE1936589B2|1969-07-18|1971-01-14|Thyssen Huette Ag|The use of a fully killed steel for welded and / or cold-formed components and constructions made of sheet metal or strip|
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    SU428022A1|1972-01-04|1974-05-15|METHOD OF THERMAL TREATMENT OF PIPES FROM LOW-ALLOY STEEL|
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    US4145235A|1972-12-28|1979-03-20|Nippon Steel Corporation|Process for producing cold rolled steel sheet and strip having improved cold formabilities|
    US3925111A|1972-12-31|1975-12-09|Nippon Steel Corp|High tensile strength and steel and method for manufacturing same|
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    JPS5220322A|1975-08-08|1977-02-16|Sumitomo Metal Ind Ltd|Process for producing a hot rolled steel band having a strong toughnes s and a high strength|
    CA1071072A|1975-12-19|1980-02-05|General Motors Corporation|Formable high strength low alloy steel|
    JPS5747748B2|1976-02-23|1982-10-12|
    US4138278A|1976-08-27|1979-02-06|Nippon Steel Corporation|Method for producing a steel sheet having remarkably excellent toughness at low temperatures|
    JPS5929649B2|1976-08-31|1984-07-21|Sumitomo Metal Ind|
    SU648624A1|1976-12-07|1979-02-25|Pavel P Navnyko|Method of heat treatment of high-strength pipes made of silico-manganese steels|
    FR2405998B1|1977-10-14|1985-05-24|Centre Rech Metallurgique|
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    法律状态:
    优先权:
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    DE2900022A|DE2900022C3|1979-01-02|1979-01-02|Process for producing profiles|
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