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首页> 外文会议>International Conference on Microalloying for New Steel Processes and Applications; 20050907-09; Basque Country(ES) >Development of X60/X70 Line Pipe Steels through EAF-Thin Slab Casting Technology at Ezz Flat Steel, Ain Sukhna, Egypt
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Development of X60/X70 Line Pipe Steels through EAF-Thin Slab Casting Technology at Ezz Flat Steel, Ain Sukhna, Egypt

机译：通过EAF薄板坯连铸技术在埃及Ain Sukhna的Ezz Flat Steel开发X60 / X70管线钢

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API X60/X70 line pipe steels are characterized by their higher strength and excellent toughness properties, which are achieved through grain refinement by addition of micro-alloying elements and controlled rolling. Thin slab casting of Nb micro-alloyed steel is a great challenge to the steel producer because of possible transverse cracking of slabs. The major casting parameters, which affect transverse cracking, were critically examined and modified for production of defect free slabs. The hot strip mill parameters were also designed for controlled rolling of slabs to achieve the desired mechanical properties. Three heats (one X60 and two X70) of each 175 ton liquid steel were made and processed into 6, 8 and 10 mm hot rolled coils. In the heat of X60, Nb and Ti were used as micro-alloying elements where as vanadium was also added in X70 heats to achieve the desired strength. The YS/UTS ratio was designed to be below 0.9 by controlling the amount of Si and Mn. During slab casting, liquid core reduction (LCR) was used to reduce the slab thickness from 90 to 70 mm and to minimize the center line segregation and porosity. The slabs were heated and homogenized in a tunnel furnace at 1150 ± 10℃ before rolling in the roughing mill. The rolling procedure was designed to achieve the highest possible amount of deformation at the roughing stand for best conditioning of austenite before rolling in the finishing mill. 50% and 35% reductions in slab thickness were given for rolling of 6 and 10 mm coils respectively. The final thickness reduction was then distributed over 5-6 stands of the finishing mill depending on the coil thickness. All parameters were designed to achieve finish rolling temperature 850 ±10℃ in the austenite region and very near to Ar_3. After rolling, the steel was fast cooled to 570±10℃ before coiling. Mechanical properties and microstructure evolutions were extensively investigated. The tensile properties particularly the elongation and YS/UTS ratio achieved were good. The CVN impact energy in transverse direction was found to be very high ranging from 220 to 330 Joules. Furthermore, the impact transition temperature (ITT) was found to be below -70℃. The results of the drop weight tear test (DWTT) showed fully ductile behavior up to -40℃ confirming the impact test results. SEM study was carried out to assess the fracture mechanism of impact-tested specimens at different temperatures.
机译：API X60 / X70管线钢的特点是具有较高的强度和出色的韧性，这是通过添加微合金元素和控制轧制来细化晶粒而实现的。 Nb微合金钢的薄板坯连铸对钢生产商来说是一个巨大的挑战，因为板坯可能会出现横向开裂。对影响横向开裂的主要铸造参数进行了严格检查，并对其进行了修改，以生产无缺陷的板坯。还设计了热轧机参数，以控制板坯的轧制以获得所需的机械性能。每种175吨液态钢进行3炉加热（1炉X60和2炉X70），并加工成6、8和10毫米热轧卷。在X60的热量中，Nb和Ti用作微合金元素，在X70的热量中还添加了钒，以达到所需的强度。通过控制Si和Mn的含量，将YS / UTS比设计为低于0.9。在板坯铸造过程中，采用液芯还原法（LCR）将板坯厚度从90 mm减小到70 mm，并使中心线偏析和孔隙率最小化。在粗轧机中轧制之前，将板坯在1150±10℃的隧道炉中加热并均质化。轧制程序设计为在粗轧机机架上获得最大可能的变形量，以便在精轧机轧制之前对奥氏体进行最佳调节。分别轧制6毫米和10毫米卷板时，板坯厚度分别减少了50％和35％。然后根据卷材厚度，将最终的厚度减少量分配到精轧机的5-6机架中。所有参数均设计为在奥氏体区域且非常接近Ar_3时达到850±10℃的终轧温度。轧制后，在卷取之前将钢快速冷却至570±10℃。力学性能和微观结构的演变进行了广泛的研究。所获得的拉伸性能，特别是伸长率和YS / UTS比良好。发现横向上的CVN冲击能非常高，范围为220至330焦耳。此外，发现冲击转变温度（ITT）低于-70℃。落锤撕裂试验（DWTT）的结果表明，在-40℃时具有充分的延展性，证实了冲击试验的结果。进行了SEM研究以评估在不同温度下冲击测试的样品的断裂机理。

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