公开(公告)号：US4138278A

公开(公告)日：1979-02-06

申请号：US826820

申请日：1977-08-22

申请人： Hajime Nakasugi ,  Hiroaki Masui ,  Hiroshi Tamehiro ,  Hiroo Mazuda

发明人： Hajime Nakasugi ,  Hiroaki Masui ,  Hiroshi Tamehiro ,  Hiroo Mazuda

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

CPC分类号： C22C38/12 ,  C21D8/0226 ,  Y10S72/70

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℃。

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。

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。