Method for producing a steel sheet having remarkably excellent toughness
at low temperatures
    3.
    发明授权
    Method for producing a steel sheet having remarkably excellent toughness at low temperatures 失效
    低温韧性优异的钢板的制造方法

    公开(公告)号:US4138278A

    公开(公告)日:1979-02-06

    申请号:US826820

    申请日:1977-08-22

    IPC分类号: C21D8/02 C22C38/12 C21D7/14

    摘要: A method for producing a steel sheet having excellent low-temperature toughness, comprising a step of heating to a temperature not higher than 1150.degree. C., a steel slab containing 0.01 - 0.13% C, 0.05 - 0.8% Si, 0.8 - 1.8% Mn, 0.01 - 0.08% total Al, 0.08 - 0.40% Mo and not more than 0.015% S with the balance being iron and unavoidable impurities, and a step of hot rolling the steel slab thus obtained by at least three passes with a minimum reduction percentage not less than 2% by each rolling pass in a temperature range of 900 - 1050.degree. C, a total reduction percentage not less than 50%, and with a finishing temperature not higher than 820.degree. C.

    摘要翻译: 一种制造具有优异的低温韧性的钢板的方法,包括加热至1150℃以下的步骤,含有0.01〜0.13%C,0.05〜0.8%Si,0.8〜1.8% Mn,0.01〜0.08%的总Al,0.08〜0.40%的Mo和不大于0.015%的S,余量为铁和不可避免的杂质,以及通过至少三道次热轧钢板的步骤, 在900-1050℃的温度范围内的轧制通过率不低于2%,总还原率不低于50%,最终温度不高于820℃。

    Method for producing a high toughness and high tensil steel
    5.
    发明授权
    Method for producing a high toughness and high tensil steel 失效
    高韧性高张力钢生产方法

    公开(公告)号:US3976514A

    公开(公告)日:1976-08-24

    申请号:US548617

    申请日:1975-02-10

    IPC分类号: C21D8/02 C22C38/04 C21D7/14

    CPC分类号: C22C38/04 C21D8/0226

    摘要: A method for producing a high tensile strength steel plate which comprises subjecting to a low temperature rolling, a steel composition containing not more than 0.25% of carbon, not more than 0.5% of silicon, 0.5 to 2.0% of manganese, not more than 0.015% of sulfur, 0.005 to 0.1% of aluminum, one or more of niobium, vanadium and titanium in an amount not less than 0.01%, and REM in an amount not less than 1.3 times the amount of sulfur, with optionally one or more of nickel, chromium and copper, with the balance being iron and unavoidable impurities, which steel possesses a low notch toughness transition temperature and high absorbed energy in the notch-impact test, and is suitable in the as rolled condition for use as pipe lines in cold districts.

    摘要翻译: 一种高强度钢板的制造方法,其特征在于,在低温轧制下,含有不超过0.25%的碳,不超过0.5%的硅,0.5〜2.0%的锰,不大于0.015 0.1%的硫,0.005〜0.1%的铝,不少于0.01%的铌,钒和钛中的一种或多种,​​REM量不小于硫的1.3倍,以及任选的一种或多种 镍,铬和铜,余量为铁和不可避免的杂质,该钢在缺口冲击试验中具有较低的缺口韧性转变温度和较高的吸收能,适用于冷轧管线的轧制条件 区。

    Method for heat treatment of high-toughness weld metals
    7.
    发明授权
    Method for heat treatment of high-toughness weld metals 失效
    高韧性焊接金属热处理方法

    公开(公告)号:US4062705A

    公开(公告)日:1977-12-13

    申请号:US492754

    申请日:1974-07-29

    摘要: A method for obtaining a weld metal having excellent toughness at low temperatures as below -40.degree. C, which method comprises heating the weld metal having a specific steel composition to its austenitizing temperature and cooling it or holding it at the temperature for not longer than 25 minutes and then quenching and tempering it. In order to further improve the low temperature toughness, the weld metal is reheated again to the Ac.sub.1 to Ac.sub.3 range. Excellent low temperature toughness of the weld metal can be obtained without the necessity of using any special welding materials.

    摘要翻译: 一种获得在低于-40℃的低温下具有优异韧性的焊接金属的方法,该方法包括将具有特定钢组成的焊接金属加热至其奥氏体化温度并冷却或将其保持在不超过25℃的温度 几分钟,然后淬火回火。 为了进一步提高低温韧性,将焊接金属再次加热至Ac1〜Ac3的范围。 无需使用任何特殊的焊接材料即可获得焊接金属的优异的低温韧性。

    Induction heating method of steel pipe
    8.
    发明授权
    Induction heating method of steel pipe 失效
    钢管感应加热方式

    公开(公告)号:US4115675A

    公开(公告)日:1978-09-19

    申请号:US802195

    申请日:1977-05-31

    CPC分类号: C21D9/08

    摘要: A method for heating steel pipe for induction heating coils, while the pipe is travelling through said coils in the axial direction, which comprises:(a) calculating the limit absorption electric power density Po (W/cm.sup.2) by the followng formula:Po = 1/40 x T x .sqroot.dwhere T = heating temperature (.degree. C) and d = wall thickness (mm);(b) attaching a power supply of low frequency to the induction heating coils;(c) setting said power supply for maximum capacity to be impressed to said induction heating coils, and(d) heating the steel pipe as it is travelling through said induction heating coils heated by said power supply, at such speed as to permit the steel pipe to be heated to the desired temperature, and heating the steel pipe with the set power if the absorption electric power density P by the set power is P .gtoreq. Po, and heating the steel pipe by shortening the effective length of the induction heating coils to obtain P .gtoreq. Po if P .ltoreq. Po; thereby causing the difference in the temperature between the ends and the central portion of the steel pipe in the axial direction to be no greater than about 20.degree. C.

    摘要翻译: 一种用于加热感应加热线圈的钢管的方法,同时管道沿轴向行进通过所述线圈,其包括:

    Method of heat-treatment of welded pipe and apparatus therefor
    9.
    发明授权
    Method of heat-treatment of welded pipe and apparatus therefor 失效
    焊管热处理方法及其设备

    公开(公告)号:US4142713A

    公开(公告)日:1979-03-06

    申请号:US797116

    申请日:1977-05-16

    IPC分类号: C21D9/08 C21D9/50 C21D9/14

    CPC分类号: C21D9/08 C21D9/50

    摘要: In the method of heat-treatment of welded pipe having a reinforcement weld bead therealong by heating the pipe by using an induction heating device and then by cooling it, the bead which has just been heated by the induction heating device, is further heated by a bead heater to a temperature such that the temperature difference between the metal of the pipe and the bead is smaller than a temperature difference which will produce a bad influence on the quality of the pipe.In the apparatus for heat-treatment of welded pipe having a reinforcement weld bear therealong by heating and then by cooling the pipe respectively by a heating device and a cooling device arranged in the direction of travel of the pipe, there is provided between the heating device and the cooling device a temperature-difference detector for detecting the temperature difference between the metal of the pipe and the bead, and also a bead heater for heating the bead so as to make the temperature difference between the metal of the pipe and the bead smaller than the aforementioned temperature difference.

    摘要翻译: 在通过使用感应加热装置加热管道然后通过冷却将具有加强焊道的焊接管热处理的方法中,刚刚被感应加热装置加热的焊道进一步被加热 胎圈加热器的温度使得管子和胎圈的金属之间的温度差小于对管子质量产生不良影响的温度差。