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    Method of making wrought high tension steel having superior low temperature toughness
    1.
    发明授权
    Method of making wrought high tension steel having superior low temperature toughness 失效
    制造具有优异的低温韧性的锻造高张力钢的方法

    公开(公告)号：US4521258A

    公开(公告)日：1985-06-04

    申请号：US562250

    申请日：1983-12-16

    申请人： Hiroshi Tamehiro ,  Hiroo Mazuda ,  Mamoru Ohashi ,  Yasumitsu Onoe

    发明人： Hiroshi Tamehiro ,  Hiroo Mazuda ,  Mamoru Ohashi ,  Yasumitsu Onoe

    IPC分类号： C22C38/00 ,  C21D8/00 ,  C21D8/02 ,  C22C38/04 ,  C22C38/14

    CPC分类号： C22C38/04 ,  C21D8/0226 ,  C21D2211/002 ,  C21D2211/005

    摘要： Due to increasing demands for steel to be used for construction such as buildings, pressure vessels, pipe lines or the like, various kinds of high tension steels, particularly steels suitable for welding have increasingly been developed.Heretofore, proposed methods of making such high tension steel have relied on so-called cold rolling and/or rolling followed by quenching and tempering, however, these conventional steels have suffered from drawbacks such as a tempering step indispensable after quenching, softening of welded zone and lack of uniformity in the metal structure in the direction of plate thickness.A compositional feature of the new method resides in addition of minor amounts of Ti and B along with Nb as contributing to grain refining or precipitation hardening elements in addition to limited amounts of other ingredients such as C, Si, Mn, S, Al and N.Further addition of at least one of V, Ni, Cu, Cr, Mo, Ca and REM also acts to improve the properties of the steel.The steel prepared to have the aforesaid composition is subjected to controlled heating, subsequent rolling under prescribed rolling reduction ratio, temperature for terminating rolling and to a specified cooling rate.The steel plate thus processed has a structure having fine bainite grains alone or a duplex grain structure consisting of fine bainite and fine ferrite particularly finer toward the surface so as to satisfy both ductility and toughness without tempering operation and displays good weldability and toughness even at a welded zone as well as stable hardness distribution throughout the plate thickness.

    摘要翻译： 由于对诸如建筑物，压力容器，管线等的建筑用钢的需求日益增加，因此越来越多地开发出各种高张力钢，特别是适用于焊接的钢。 迄今为止，所提出的制造这种高张力钢的方法依赖于所谓的冷轧和/或轧制，随后进行淬火和回火，然而，这些常规钢已经具有淬火后不可缺少的回火步骤，焊接区软化 并且金属结构在板厚方向上缺乏均匀性。 除了有限量的其他成分如C，Si，Mn，S，Al和N之外，新方法的组成特征是除了少量的Ti和B以及Nb之外还有助于晶粒细化或沉淀硬化元素 进一步添加V，Ni，Cu，Cr，Mo，Ca和REM中的至少一种也用于改善钢的性能。 将制备成具有上述组成的钢进行受控加热，随后在规定的滚动压下率，终轧的温度和规定的冷却速度下进行轧制。 这样加工的钢板具有单独的贝氏体细晶粒或由细贝氏体和细小铁氧体构成的双相晶粒结构，特别是在表面上更细，以便在不进行回火操作的情况下既满足延展性又具有韧性，即使在 焊接区域以及整个板厚度的稳定的硬度分布。

    Method of producing steel having high strength and toughness
    2.
    发明授权
    Method of producing steel having high strength and toughness 失效
    具有高强度和韧性的钢的生产方法

    公开(公告)号：US4591396A

    公开(公告)日：1986-05-27

    申请号：US646490

    申请日：1984-09-04

    申请人： Hiroo Mazuda ,  Hiroshi Tamehiro ,  Mamoru Ohashi ,  Yasumitsu Onoe ,  Shinogu Tamukai

    发明人： Hiroo Mazuda ,  Hiroshi Tamehiro ,  Mamoru Ohashi ,  Yasumitsu Onoe ,  Shinogu Tamukai

    IPC分类号： C22C38/00 ,  C21D8/02

    CPC分类号： C21D8/0226 ,  C21D2211/002 ,  C21D2211/005

    摘要： A micro-alloy plate having not only high tensile strength and high toughness both at room temperature and low temperature but which also displays superior weldability and excellent toughness at a heat affected zone (HAZ) of welding.The steel contains 0.005-0.08 C, not more than 0.6% Si, 1.4-2.4% Mn, 0.01-0.03% Nb, 0.005-0.025% Ti, 0.005-0.08% Al, not more than 0.003% S, 0.0005-0.005% Ca, not more than 0.005% O, not more than 0.005% N, all being represented by weight and the balance being incidental impurities, further the steel must satisfy the following requirements; ##EQU1## The steel thus prepared is heated at a temperature range of 900.degree.-1000.degree. C., hot rolled with a rolling reduction of more than 60% below 900.degree. C. with a rolling finishing temperature within a range from 20.degree. C. above the Ar.sub.3 point down to 10.degree. C. below the Ar.sub.3 point and, immediately after the rolling, the steel stock is cooled down to 300.degree. C. or lower at a cooling rate of 15.degree.-60.degree. C./sec.The steel may further contain small amounts of at least one alloying element selected from the group of Ni, Cu, Cr, Mo, V and B.Due to these composition controls together with controlled heating, rolling and cooling, the product steel stock obtains a very fine grained and uniform microstructure and thereby satisfies the required mechanical properties suitable for use in welded constructions in many fields such as buildings, pressure vessels, the ship building industry and pipe lines.

    摘要翻译： 这种微合金板在室温和低温下不仅具有高拉伸强度和高韧性，而且在焊接的热影响区（HAZ）上也显示出优异的焊接性和优异的韧性。 该钢含有0.005-0.08℃，不超过0.6％Si，1.4-2.4％Mn，0.01-0.03％Nb，0.005-0.025％Ti，0.005-0.08％Al，不大于0.003％S，0.0005-0.005％ Ca不大于0.005％O，不大于0.005％N，全部以重量表示，余量为杂质，另外钢必须满足以下要求; （A）图像（B）将如此制备的钢在900℃-1000℃的温度范围内加热，在900℃以下的轧制压下率下进行热轧，轧制 退火温度在Ar3以上20℃至Ar3点以下10℃的范围内，轧制后立即以冷却速度15℃冷却至300℃以下 DEG -60℃/秒。 钢可能还含有少量的选自Ni，Cu，Cr，Mo，V和B中的至少一种合金元素。由于这些组成控制以及受控的加热，轧制和冷却，产品钢原料获得 非常细小的均匀微观结构，从而满足适用于诸如建筑物，压力容器，造船工业和管道等许多领域的焊接结构中所需的机械性能。

    Method for producing steel strip or steel sheet containing carbide and nitride forming elements
    4.
    发明授权
    Method for producing steel strip or steel sheet containing carbide and nitride forming elements 失效
    含有碳化物和氮化物形成元素的钢带或钢板的制造方法

    公开(公告)号：US4125416A

    公开(公告)日：1978-11-14

    申请号：US829461

    申请日：1977-08-31

    申请人： Hiroshi Katoh ,  Yasumitsu Onoe ,  Koichi Kawamura ,  Osamu Akisue

    发明人： Hiroshi Katoh ,  Yasumitsu Onoe ,  Koichi Kawamura ,  Osamu Akisue

    IPC分类号： C22C38/00 ,  C21D7/13 ,  C21D8/02 ,  C21D8/04 ,  C21D9/48 ,  C21D1/02

    CPC分类号： C21D8/041 ,  C21D7/13 ,  C21D8/0426

    摘要： A method for producing a low carbon deep drawing quality steel or high strength steel in the form of a strip or sheet. At least one of carbide or nitride forming elements is added to the low carbon steel to provide therein 0.015 to 0.10% Sol Al, 0.01 to 0.10% Nb, 0.01 to 0.10% Ti and 0.01 to 0.15% V. The steel is cast or bloomed to form a slab which is held above the Ar.sub.3 point for keeping the carbide and nitride forming elements in a dissolved state. Then, without allowing the temperature to fall below the Ar.sub.3 point, hot rolling and hot finishing rolling are directly carried out at a temperature above the Ar.sub.3 point. Thereafter, if necessary and desirable, the thus-rolled slab or sheet is subjected to cold rolling and annealing.

    摘要翻译： 一种用于生产带状或片状形式的低碳深拉深质量钢或高强度钢的方法。 将碳化物或氮化物形成元素中的至少一种添加到低碳钢中以提供0.015至0.10％的Sol Al，0.01至0.10％的Nb，0.01至0.10％的Ti和0.01至0.15％的V。钢被铸造或开裂 以形成保持在Ar3点以上以保持碳化物和氮化物形成元件处于溶解状态的板坯。 然后，不使温度降低到Ar3点以下，在Ar3点以上的温度下直接进行热轧和热精轧。 此后，如果需要和期望，将如此轧制的板坯或片材进行冷轧和退火。

    Cooling apparatus for thick steel plate
    7.
    发明授权
    Cooling apparatus for thick steel plate 失效
    厚钢板冷却装置

    公开(公告)号：US4591133A

    公开(公告)日：1986-05-27

    申请号：US671798

    申请日：1984-11-15

    申请人： Masaki Umeno ,  Keiji Fukuda ,  Yasumitsu Onoe

    发明人： Masaki Umeno ,  Keiji Fukuda ,  Yasumitsu Onoe

    IPC分类号： B21B45/02 ,  C21D9/46 ,  C21D9/52 ,  C21D1/62

    CPC分类号： C21D9/46 ,  B21B45/0233

    摘要： A cooling apparatus for uniformly cooling a thick steel plate in order to obtain a very flat thick steel plate constituted by a cooling water supply apparatus provided with more than two header systems by which a desired water volume crown is given in the width direction of the thick steel plate.

    摘要翻译： 一种用于均匀地冷却厚钢板的冷却装置，以便获得由冷却水供给装置构成的非常平坦的厚钢板，所述冷却水供给装置设置有两个以上的集管系统，通过该冷却水供给装置在厚度的宽度方向上具有期望的水量冠 铁盘子。