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首页> 外文期刊>Metallurgist >Study of the Effect of Process Parameters in Steel Production on the Content of Corrosion-Active Nonmetallic Inclusions in Corrosion-Resistant Pipes
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Study of the Effect of Process Parameters in Steel Production on the Content of Corrosion-Active Nonmetallic Inclusions in Corrosion-Resistant Pipes

机译：钢铁生产工艺参数对耐腐蚀管材中活性非金属夹杂物含量影响的研究

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The main reason for the accelerated local corrosion of tubes is contamination of the steel by corrosionactive nonmetallic inclusions (CAN1), which determine the metallurgical properties of tube steel in terms of their corrosion resistance. Studies have shown that there are two main types of corrosion-active nonmetallic inclusions: CANI_1 - inclusions based on calcium aluminates; CANI_2 - complex inclusions that contain calcium sulfide. In order to master to production of tubes of steel 20-PKS at the Volga Pipe Plant (VTZ), a study was made of the effect of the parameters of out-of-furnace treatments on the contamination of steel by CANI. 1. The mechanisms and main sources of fonnation of CAN_Iin tube steels made by the VTZ were determined. The main reasons for the formation of CANI_1 in furnace slag containing thermodynamically active CaO are mixing of the metallic and slag phases during the argon blow and the simultaneous introduction of additions to correct the chemical composition of the steel. Inclusions of the CANI_2 type may be formed by deoxidation operations carried out with suboptimal proportions of added aluminum and calcium (lime). 2. The following measures are recommended to ensure that steel 20-PKS made by the VTZ is clean with respect to both types of CANI: optimize the composition of the ladle slag (increase the average content of Al_2O_3, increase the average content of SiO_2 as much as possible, and in any case decrease the average concentration of CaO); keep the mass ratio of added CaO to added Al within the range 1.5-2; continue the argon blow done after addition of the last batch of ferroalloy s for at least 15-20 min; ensure that the intensity of the blow is at least 0.5-1.5 m~3/min. 3. Vacuum-degassing steel in the ladle after treatment on a ladle-furnace unit makes it possible to distribute the CANI more uniformly over the volume of the steel.
机译：加速管的局部腐蚀的主要原因是具有腐蚀活性的非金属夹杂物（CAN1）对钢的污染，这从管的耐腐蚀性方面决定了管钢的冶金性能。研究表明，腐蚀活性非金属夹杂物主要有两种类型：CANI_1-基于铝酸钙的夹杂物; CANI_2-包含硫化钙的复杂包裹体。为了在伏尔加钢管厂（VTZ）掌握20-PKS钢管的生产，进行了炉外处理参数对CANI对钢的污染的影响的研究。 1.确定了由VTZ制造的CAN_Iin管钢的形成机理和主要来源。在包含热力学活性CaO的炉渣中形成CANI_1的主要原因是在吹氩过程中金属相和炉渣相混合以及同时引入添加剂以校正钢的化学成分。 CANI_2类型的夹杂物可以通过以次优比例添加的铝和钙（石灰）进行脱氧操作而形成。 2.建议采取以下措施，以确保由VTZ生产的20-PKS钢相对于两种CANI而言都是清洁的：优化钢包渣的成分（增加Al_2O_3的平均含量，增加SiO_2的平均含量）尽可能地降低CaO的平均浓度）;将添加的CaO与添加的Al的质量比保持在1.5-2的范围内;加入最后一批铁合金后，继续吹氩至少15-20分钟;确保吹气强度至少为0.5-1.5 m〜3 / min。 3.在钢包炉单元上进行处理后，将钢包中的钢进行真空脱气可以使CANI在钢的整个体积上更均匀地分布。

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