ASEA—SKF精炼过程全氧影响因素的探究

结合马钢90tASEA－SKF的生产实际,对过程Al控制、真空脱氧、夹杂物去除和净化搅拌等方面对降低钢中全氧的作用进行了研究,并据此改进操作工艺后,获得了较低的全氧含量,提高了钢的洁净度。     

PLC在VD精炼炉的运用

阐述了利用ＰＬＣ改造传统设备的过程及效果。     

单嘴精炼炉处理轴承钢的脱氧工艺

本文提出了构成无内阻或无内阻抗电流表的一种方法，应用负电阻或负阻抗换消了电流表的内阻或内阻抗，从而显著地提高了电流的测量精度。     

用钡合金进行钢水脱氧的实践

为了提高轴承钢、齿轮钢和弹簧钢的洁净度,对影响其质量的各种因素进行了分析,提出了以铝预脱氧为基础、用钡合金进行终脱氧和夹杂物变性的脱氧工艺,使轴承钢、弹簧钢和齿轮钢的氧含量分别稳定在10×10-6、15×10-6及20×10-6以下,并使夹杂物的组成和分布得到改善.     

LF精炼气瓶钢的Si-Ca-Ba合金脱氧工艺

天津钢管公司采用150 t EAF-150 t LF(VD)-CC工艺生产30CrMo,37Mn等气瓶钢Φ210~310 mm圆管坯。生产统计数据表明,在LF精炼时用Si≥50%,Ca≥12%,Ba≥13%合金替代全用Al脱氧,使[Al_t]从0.026%降至0.006%,钢中氧含量为25×10^-6,提高了钢的清洁度,减少了轧制过程中钢材的裂纹废品。     

ASEA-SKF钢包精炼炉脱氧工艺探讨

采用不同的脱氧材料,选择３种工艺方案,对ＡＳＥＡ－ＳＫＦ精炼炉脱氧工艺进行了研究探讨,并研究了不同的脱摒工艺条件下钢中〖Ｎ〗、〖Ｈ〗、〖Ｓ〗含量的变化情况,找出了较为理想的脱氧工艺的方案。     

RH真空精炼炉脱气工艺分析

结合生产实际数据,分析了RH真空脱气工艺过程。如要求[H]≤1.8×10-6,需真空处理9min;当要求[H]≤1.5×10-6时,冬、春季节RH处理时间为≥11min,夏季则为≥12min,秋季应为≥13min;RH脱氮率约为23%,且在脱气超过8min时RH脱氮出现拐点,延长真空处理时间对脱氮影响不大。     

100t罐式真空脱气（VD）精炼工艺实践

100ｔ真空罐式精炼炉(以下简称ＶＤ)是上海五钢有限公司年产55万ｔ的100ｔ直流电弧炉—二次精炼—连铸生产线的重要组成部分。ＶＤ于1997年建成后开始热调试,1998年试生产。ＶＤ由真空罐、罐盖、真空罐盖车、密封圈保护挡板、真空合金加料装置、真空管道、除尘冷却器、主截止阀、蒸汽喷射泵等组成。为了摸索真空精炼工艺,进行了真空精炼脱气和脱硫试验,取得了满意的效果。1　ＶＤ基本工艺参数的设定采用ＨＹＤＲＩＳ浸入式在线定氢仪、离线氮分析仪和炉前化学分析仪器对包括轴承钢在内的各类钢种在真空精炼前后的氢、氮和硫含量进行测定。盛…     

精炼过程中的真空碳脱氧试验

电炉出钢的过氧化现象比较频繁，使后步工序脱氧剂及辅料成本增加，且容易产生钢板探伤不合。通过采取真空碳脱氧工艺，可以在大幅降低生产成本的前提下，提高钢板探伤合格率。     

Kinetic Model of Steel Refining in a Ladle Furnace

A ladle furnace operates with a highly reducing slag provided the slag carry over is properly controlled; however, this seldom occurs. In addition, argon injection is also employed to increase mass transfer and thus, the removal of impurities from the molten steel. The refining process is mathematically modeled in this work on the basis of mass transfer control. The model involves the computation of activities with the use of a regular solution model, incorporates interaction parameter's and computation of a mass transfer coefficient which allow for the determination of the mass transfer rates across the slag‐metal interface under conditions of equilibrium at the interface. The model predicts the composition profile of both slag and steel during the refining process and can be used to make corrections to the initial slag composition in order to decrease both the refining time and the final concentration of impurities in liquid steel.     

20t钢包精炼炉真空系统的设计

大冶特殊钢股份有限公司二炼钢厂原有 5台电弧炉和 1台 1 8ｔ精炼炉 ,生产中因无法配套而影响合金钢产品质量。为提高钢水的精炼比 ,满足质量需求 ,公司决定将原 5号电弧炉拆除 ,在原地改建 1座 2 0ｔ精炼炉。并对该精炼炉的真空系统进行了设计。1　真空系统基本参数要求在冶金行业进行钢液真空处理时 ,一般选择喷射泵作为其真空系统的真空泵 (图 1 )。喷射泵由工作喷嘴和扩压器以及混合室相连而组成 ,工作喷嘴和扩压器这两个部件组成了一条断面变化的特殊的气流管道。气流通过喷嘴可将压力能转变为动能 ,而通过扩压器又可将动能回复变为压…     

RH-MFB精炼过程钢包内钢液流动与碳浓度分布的模拟研究

根据某厂RH-MFB的生产实际,采用CFX软件建立钢包内钢液流动与碳浓度分布的耦合数学模型,对钢液的流动特性以及碳浓度的分布情况进行研究,利用现场数据验证所建模型,分析了脱碳后期钢液碳浓度的分布情况,考察了工艺设备等因素对脱碳处理过程的影响,为超低碳钢的工艺优化提供理论依据和指导.     

Research on Refining Technology of Clean Steel in a Plasma Ladle Furnace

The clean steel refining tests carried out in a 100 kg plasma ladle furnace（PLF）were to show the metallurgical effects of the different plasma gases such as Ar-H₂ and Ar-CO₂.The variations of carbon,nitrogen contents in steels and the mechanism of denitrogenation were studied.Compared with the conventional ladle furnace,when the plasma gases were injected into the ladle furnace,there was a decarburization process,the carburetion rates were reduced obviously.The carburetion rate is 3.6×10^-6per minute for the steel heated by conventional LF,and is 2.20 and 1.35 times of the heats blown 85%Ar-15%H₂ and 85%Ar-15%CO₂,respectively.When the plasma ladle furnace operated with Ar-H₂ plasma gas,the denitrogenation of the molten steel occurs.The lowest denitrogenation rate is 0.30×10^-6per minute when Ar-H₂ gas mixtures were used.The main reactant gas is monatomic hydrogen and the main product of denitrogenation is NH₃ for Ar-H₂ injection.