• 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:
    A molten steel, which may optionally contain boron to increase hardenability is poured into ingot molds, bloomed and primary hot worked to a mother tube of intermediate cross-section. Before being cooled down to below about 800 DEG C, the mother tube is reheated to about 930 DEG C, scale from the outside surface thereof is removed, and it is secondary hot worked to a pipe of final dimensions with a reduction, measured in terms of equivalent strain as expressed by the following formula, of not less than epsilon = 0.02 for the removal of scale from the inside surface of the pipe. It is then directly quenched to produce a finished seamless steel pipe having far better shape at a higher heat efficiency than in the conventional process. Better toughness is effected when the degree of secondary hot work is not smaller than epsilon = 0.20.
    公开号:SU852179A3
    申请号:SU762415405
    申请日:1976-10-28
    公开日:1981-07-30
    发明作者:Уэно Масакацу；Ито Каметаро；Като Осаму；Каваючи Нобуюки
    申请人:Ниппон Стил Корпорейшн (Фирма)；
    IPC主号:
    专利说明:

    stitching austenite grain to increase the ductility of steel. The hardenability of the steel can be adjusted by adding boron B if specific heat treatment conditions are applied before quenching. FIG. 1 is a diagram showing the dependence of the percentage of scale ;. the remaining on the inner surface of the steel pipe from the relative deformation after the completion of the second phase of hot rolling; in fig. 2 is a graph showing the probability of occurrence of boron compounds either at grain boundaries or at the base of a crystalline substance for sample 10 (Table O, austenized at 1250 ° C and heated for 5 minutes; fig. 3 - di agram) showing the distribution of finished steel pipes from steel No. 1 according to the degree of deformation (the proposed method is compared with the known one); 9 Fig. 4 shows the geometry of the steel pipe used in Fig. 3; Fig. 5 is a diagram showing the temperature change over time steel in the production of seamless steel pipe; n Fig. 6 shows the rolling and heat treatment line. According to the invention, the tubular billet from the first hot rolling stage is kept for a time sufficient to evenly distribute the temperature throughout the pipe, and then goes into austenitic structure to remove scale from its outer surface. descaling the tubular billet is subjected to a second hot rolling operation with reduction, measured as the same relative deformation (SS), greater than 0.02. At the same time, almost all the dross is removed from the inner surface of the pipe (Fig. 1). It is assumed that such a reduction in diameter causes the formation of a large amount of thermal energy sufficient to compensate for the temperature drop near the outer surface of the draft tube as a result of the descaling operation, so that the temperature distribution becomes uniform in the radial direction of the tube. When the outer and inner surfaces of the pipe are free from scale and their temperature is restored, the same steel pipe is sharply cooled from the temperature. exceeding point Aij to produce finished steel pipe. To prevent hardened To prevent undesired deformation of a hardened pipe over length, it is important to control its cooling rate — which can be done with sufficient precision only if the pipe to be quenched does not have scale and cooling starts when the pipe temperature is evenly distributed. The machining of a pipe in a hot state is combined with a subsequent heat treatment involving a quenching operation, so that the pipe can be quenched before its temperature falls below the critical temperature level. This leads to the formation of surfaces of the pipe to be quenched, without scale, and to a uniform temperature distribution in the radial direction of the pipe. Thus, it becomes possible to impart to the hardened pipe a homogeneous microstructure with limited deformation to a small extent. The second hot rolling operation is carried out with a reduction greater than 0.20 to grind the austenitic grains in order to improve the ductility of the pipe. In addition, they take advantage of the utilization of the heat energy of a hot rolled pipe during the quenching operation, thereby saving the additional amount of thermal energy that would otherwise be necessary to increase the temperature of the pipe to be quenched if the pipe is cooled after the second hot rolling operation. to room temperature. The main equipment for carrying out the first hot rolling operation consists mainly of three elements, namely, a piercing mill, a rolling mill and a roll-run machine, and, if necessary, a subsequent calibration mill. This equipment is located along the pipe production line, while the main equipment for the production of pipes with final dimensions from the pipe billet, supplied from the first hot rolling operation, consists only of a single calibration mill and a reducing mill with tension for rolling the pipe billet by adjustable reduction of the pipe diameter , as stated above. At the earliest stage of the process of producing synthetic seamless pipes, i.e., the smelting operation in a conventional steelmaking furnace, for example, a converter or an electric furnace, the chemical composition of the steel is brought in and a vacuum degassing operation can be carried out to refine the molten steel into the mold. or machine for continuous casting. Such castings are in the form of blanks or blooms with dimensions suitable for the manufacture of pipes with intended final sizes. Preliminary determination of the chemical composition for the proposed method is not essential. It is preferable to use the method for carbon or low alloy steels, the chemical composition of which is in the following limits, wt.% Carbon Up to 0.50, preferably 0.05-0.3 Silicon Up to 1.5 - - 0.01-0.4 Manganese Up to 3.0 - - 0.8-1.5 Taking into account the necessary strength, elasticity, resistance to corrosion, etc., one or more of the following elements may be added, wt.%: Chrom0.01-5.0 Nickel0 , 01-2.0 Copper0.01-1.0 Molybdenum0.01-2.0 AluminumUp to 0.01 VanadiumUp to 0.5 TitanUp to 0.5 ZirconiumUp to 0.5 NiobiumUp to 0.5 Bor0,0003-0.0050 IronEverything Else (for exception n inevitable note with her) . It has been established that of all these alloying elements, boron is particularly effective for increasing the hardenability of steels, despite the fact that the specific heat treatment conditions (described below) are satisfactory. In this case, it is preferable to add the element forming the nitrides, such as with boron, for example, in order to avoid loss of the effective boron from the reaction with nitrogen. Yes, acidification, desulphurisation, improvement of elasticity in the direction of C and others. Ca, rare-earth elements and others can be added to the steel composition at: ad11 .... In order to obtain finished steel pipes of high strength in combination with high ductility, it is necessary that the temperature of the billet before entering the operation of establishing uniform temperature distribution is either higher than point Ar or lower than point Ar and the degree of hot rolling carried out its second stage should be adjusted in accordance with the final properties of steel pipes. A tempering operation can be used to control the final strength in combination with ductility. If the main goal is to obtain high plasticity, it is advantageous to perform a tempering operation at a temperature between and the point Agt. Heating can be done using any kind of heating system, such as induction or electric. The line of mechanical and heat treatment (fng. 6} consists of a heating furnace for heating a steel slab, machines. First hot machining for rolling a steel slab heated to its working temperature in the heating furnace into a tubular billet having an intermediate furnace size 3 preheating for heating and maintaining at a certain temperature the billet processed by the first machine until the austenization of the descaling device 4 is completely attached to the surface of the billet removed from under In addition, the line has a second rolling mill 5 for processing billet with a removed scale on the device for descaling and a device 6 for hardening a steel pipe machined on the second rolling mill, installed in the same line as the second rolling mill Example: Steel containing,%: C 0.11, Si 0.23 Mp 0.81, Cr 0.82, Mo 0.37, At 0.065, N 0.0058 and B 0.0018 is made. An octenite structure is placed in a heating furnace, then scale is removed from it, and then subjected to a second hot rolling with reduction The diameter, 0.022, and immediately behind this, are quenched to obtain a seamless steel pipe with an outer diameter of 114.3 cm, a thickness of 13 mm and a length of 13 m. The degree of deformation of 50 finished pipes is measured, as shown in FIG. 4 and the results are shown in FIG. 3. According to the previous technology, the billet after the second hot rolling is cooled in air to room temperature, then heated by a heating gas-flame furnace adapted for the quenching operation (temperature 920 ° C, holding time 15 minutes) and quenched (Fig. 3). The defor mation of the finished pipe manufactured by the proposed method has noticeably decreased compared with the pipe manufactured according to the previous technology. Example 2. A set of steel samples of different chemical composition, presented in Table 2, is made. 1.8 Steel has been shaped into blooms, which are processed by the proposed: method in order to obtain stable seamless pipes with high tensile strength or a combination of high strength and high elasticity with minimal deformation, see fig. five . Each of the blooms of different chemical composition is heated to T 1250 C, then the first time is treated in a hot state in the area (W) where the operations are performed: piercing, rolling, rolling in rolls and calibration to the final temperature (Tt. Then blooms , heated to 930 ° C (J) for 15 minutes and subjected to descaling in step (DS) .c using water under high pressure, then mechanically re-processed in step (W) with a relative reduction of diameter greater than 0.02 or 0.20, then quenched starting with temperature (T) and tempering t at (T) 600 ° C for 30 minutes, the results are presented in table 2. From table 2 it follows that if the degree of processing in the second hot rolling operation is more than 0.20, then the toughness of the finished pipe is improved. R
    30.27 0.25 1.19 - - 0.028 40.14 0.22 0.75 0.62 0.180.023 50.11 0.28 1.31 - 0.036
    810
    0.03
    Oh, -2 4
    805
    table 2
    24,
    -40 18 -60 0.0061 0.021 0.0016, 0041 0, 0020 -0.0015 0.038
    权利要求:
    Claims (6)
    [1]
    1. A method of manufacturing steel seamless pipes, which includes piercing and rolling the workpiece, reducing, calibrating and quenching, characterized in that, in order to ensure high strength and toughness with minimal deformation, after heating the workpiece, the first hot flashing and rolling at auste: dation temperature, remove scale from the outer and inner side of the pipe billet, making the second billet rolling until the final dimensions are obtained by uniform relative deformation with a degree of 0.02, after which quenched.
    [2]
    2. A method according to claim 1, characterized in that the tube stock after the first hot firmware
    and the rollers are reheated for full austenization.
    [3]
    3. Method according to paragraphs. 1.2, characterized in that the preheating is carried out at a temperature higher than the austenization temperature, but more low than the temperature that the austenite grain grows.
    [4]
    4. Method according to paragraphs. 1-3, that is, that the tempering of the hardened pipe is carried out at a temperature below the point ACi5
    [5]
    5. Method according to paragraphs. 1-4, characterized in that the first-burned-down and rolling work is carried out and completed at a temperature not lower than
    O is the Arj point, and quenching is carried out directly with the temperature above Ar.
    [6]
    6. Method according to paragraphs. 1-5, characterized in that the preform is heated, the first hot
    S firmware and expansion, cooled to a temperature higher than point Ag, but lower than the temperature at which austenite grain begins to grow, a second hot puck is performed with a relative deformation rate less than 0.02, and immediately quenched, starting from lower than point Ag. 7, The method according to claims. 1-6, characterized in that the tube billet has a composition comprising from 0.0003 to 0.0050% boron, moreover
    Oh, 01 .01 -05, 0t .OS .OB. 6
    The first hot firmware and re-rifl directly reheat the workpieces at 800-1,100 ° C for more than 3 minutes. Sources of information taken into account in the examination I. M. Bernstein. Thermomechanical processing of metals and metals. Moscow, Metallurgists, 1968, p. 837.
    About W tO BO 8 (WO Ш 1tO 1 $ B 180 100 ON VtO 260 t 300
    Fig.Z
    four
    M
    : s e.
    类似技术:
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    同族专利:
    公开号 | 公开日
    DE2649019A1|1977-12-15|
    JPS52152814A|1977-12-19|
    FR2392121B1|1979-08-17|
    US4075041A|1978-02-21|
    DE2649019B2|1979-10-25|
    GB1562104A|1980-03-05|
    FR2392121A1|1978-12-22|
    JPS5711927B2|1982-03-08|
    IT1068926B|1985-03-21|
    CA1072864A|1980-03-04|
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    JP6961376A|JPS5711927B2|1976-06-14|1976-06-14|
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