带钢焊缝热处理装置

武钢硅钢片厂由日本新日铁引进的酸洗机组的头部设备中,用以焊接各种牌号硅钢片的焊机,是采用惰性气体保护焊(MIG)。试生产期间发现该焊饥在焊接一般牌号取向硅钢和高牌号无取向硅钢时,常发生焊缝(尤其在机组尾部)断裂现象,使带钢不能顺利通过,影响机组的正常生产。问题发生后,经中日双方技术人员根据现场情况分析研究,认为主要是焊缝质量不好,焊机在焊接取向硅钢时,质量没有过关,特别是焊接含硅量较     

国产化高牌号无取向硅钢退火、涂层炉新技术

从影响高牌号无取向硅钢退火工艺的主要参数入手,介绍高牌号无取向硅钢退火炉在加热、气氛控制、冷却、涂层烘烤方面的新技术,并展望无取向硅钢退火炉的发展方向.     

中、低牌号无取向硅钢热轧卷常化技术

介绍了无取向硅钢常化工艺对改善产品电磁性能的影响机制,综述了国内外高牌号无取向硅钢的常化工艺和中、低牌号无取向硅钢高温卷取工艺的研究结果,总结了中、低牌号无取向硅钢余热常化工艺研究现状以及国内外的应用特点,并针对武钢目前中、低牌号无取向硅钢生产工艺和装备的特点提出了建议。     

罩式退火生产50BW350无取向硅钢工艺研究

本钢在高牌号无取向硅钢生产没有电磁搅拌和常化退火设备的情况下,利用罩式炉退火设备,通过制定合理的化学成分和工艺制度,生产出高牌号50BW350无取向硅钢产品,磁感达到1.70 T,铁损达到3.1 W/kg,满足标准要求,实现了高牌号无取向硅钢50BW350的批量生产。     

高牌号无取向硅钢在大型发电机领域应用研究

对高牌号无取向硅钢产品在发电机领域的制备工艺及应用技术进行了分析研究;依据电机设计及制造工艺要求,指导了鞍钢高牌号无取向硅钢50AW310产品的优化升级。50AW310DF专用钢电磁性能、磁化特性及产品综合质量的改进,进一步提升了鞍钢高牌号无取向硅钢产品的生产技术水平,并以此明确了高牌号无取向硅钢品种今后研制及发展的路径及方向。     

高牌号无取向硅钢酸洗工艺的研究

对比分析了高牌号无取向硅钢和碳钢热加工过程表面产生的氧化铁皮结构,在某硅钢常化酸洗生产线上,进行了一系列酸洗实验,研究了酸洗温度、酸液浓度、抛丸密度对酸洗时间和效果的影响,认为高牌号无取向硅钢表面氧化铁皮难于酸洗的原因是其特殊的结构造成的;得出了适用于高牌号无取向硅钢工业化生产的酸洗工艺参数。     

磁场退火对无取向硅钢磁性能的影响

为了研究退火温度、磁场强度、磁场方向及退火时间等对低牌号无取向硅钢磁性能和组织的影响,在正交试验的基础上,对无取向硅钢进行不同条件的退火处理,通过对磁性能数据的正交分析,优选出最佳的工艺参数。研究结果表明:退火温度和磁场强度是影响试验钢比饱和磁化强度的主要因素,磁场强度与退火时间对剩余磁化强度也有显著的影响。当加热温度在800℃、施加磁场强度为3 T时,调整施加磁场的方向与退火时间可以使无取向硅钢的比饱和磁化强度、比剩余磁化强度分别达到260.7 emu/g、18.265 emu/g。     

电流退火对冷轧硅钢组织的影响

 研究了不同电流条件下退火冷轧无取向硅钢组织的变化规律。结果表明：电流对硅钢组织有显著影响。在施加直流电流退火条件下,再结晶速度比不施加电流退火时快得多,但施加交流电退火时的再结晶速度比施加直流电流退火时慢。     

马钢CSP流程生产无取向硅钢现状

介绍了马钢CSP流程生产无取向硅钢的现状及典型牌号产品性能。通过高牌号产品铸坯组织、热轧、常化酸洗、退火组织的差异分析,探讨了影响CSP流程与常规流程产品差异的原因。     

高牌号冷轧硅钢冶炼深脱硫工艺实践

简述了太钢第二炼钢厂生产无取向高牌号冷轧硅钢深脱硫的工艺特点,分析了无取向高牌号冷轧硅钢生产中取得的脱硫效果并针对RH生产过程中影响脱硫率的相关因素进行了分析,提出了目前脱硫存在的主要问题及其解决措施。     

Effect of welding consumables and processes on dynamic fracture toughness (J 1d) of armour grade Q&T steel joints

Abstract

Austenitic stainless steel (ASS) welding consumables are being used for welding armour grade Q&T steels, as they have higher solubility for hydrogen in the austenitic phase, to avoid hydrogen induced cracking (HIC). Even with austenitic stainless steel consumables under high dilution, the risk of HIC prevailed. In recent years, the developments of low hydrogen ferritic steel (LHF) consumables that contain no hygroscopic compounds are utilised for welding Q&T steels. The use of ASS fillers for welding armour grade Q&T steels creates a duplex microstructure (austenite and δ ferrite) in the welds, which drastically reduces the joint efficiency (ratio of ultimate tensile strength of the joint and the base metal). On the other hand, the weld made using LHF fillers exhibited superior joint efficiency due to the preferential ferrite microstructure in the welds. The use of ASS and LHF consumables for armour grade Q&T steels will lead to formation of distinct microstructures in their respective welds. This microstructural heterogeneity will have a drastic influence on the dynamic fracture toughness of the armour grade Q&T steel welds. Hence, in this investigation an attempt has been made to study the influence on the welding consumables and processes on the dynamic fracture toughness properties of armour grade Q&T steel joints. Shielded metal arc welding (SMAW) and flux cored arc welding (FCAW) processes were used for fabrication of the joints using ASS and LHF welding consumables. The joints fabricated by SMAW process using ASS consumables exhibited superior dynamic fracture toughness values compared to all other joints.     

Comparing Properties of Adhesive Bonding, Resistance Spot Welding, and Adhesive Weld Bonding of Coated and Uncoated DP 600 Steel

 Zinc coated dual phase 600 steel (DP 600 grade) was investigated, utilisation of which has gradually increased with each passing day in the automotive industry. The adhesive bonding (AB), resistance spot welding (RSW), and adhesive weld bonding (AWB) joints of the zinc coated DP 600 steel were investigated. Additionally, the zinc coating was removed using HCL acid in order to investigate the effect of the coating. The microstructure, tensile shear strengths, and fracture properties of adhesive bonding (AB), resistance spot welding (RSW), and adhesive weld bonding (AWB) joints of the coated and uncoated DP 600 steel were compared. In addition, a mechanical-electrical-thermal coupled model in a finite element analysis environment was utilised. The thermal profile phenomenon was calculated by simulating this process. The results of the tensile shear test indicated that the tensile load bearing capacity (TLBC) values of the coated specimens among the three welding methods were higher than those of the uncoated specimens. Additionally, the tensile strength of the AWB joints of the coated and uncoated specimens was higher than that of the AB and RSW joints. It was determined that the fracture behaviours and the deformation caused were different for the three welding methods.     

冷轧平整机延伸率控制系统的应用及研究

 简单介绍了冷轧平整的目的和意义,说明了延伸率的定义和测量方法。描述了应用于唐钢冷轧薄板厂平整机组的延伸率控制系统,对该延伸率控制系统中的速度前馈控制和延伸率反馈控制做了重点阐述。针对在加减速或出现其它扰动时的延伸率波动问题,提出了在反馈控制中增加比例控制的解决方案。实际结果表明,延伸率控制系统动态响应明显加快,987%的带钢延伸率偏差都控制在了01%以内。     

CSP工艺生产高牌号无取向电工钢的组织和夹杂物

 首次实现了从冶炼→CSP→常化→冷轧退火→成品检测等CSP工艺生产高牌号无取向电工钢的实验室全工序过程模拟,并对铸坯、热轧板及冷轧板中的组织及夹杂物进行了具体分析。结果表明,CSP工艺生产高牌号无取向电工钢是可行的;成品磁性能满足国际标准要求;薄铸坯、热轧板、成品板组织具有典型高牌号无取向电工钢组织特点;过程析出物主要为：AlN,AlN+MnS。     

Comparative study of resistance spot welding performance between cold-rolled DP980 and Q&P980 steels

Advanced high strength steel (AHSS) has been widely used in the automobile industry.The resistance spot welding performance of DP980 and Q&P980 steels was studied through comparing the two steels’welding current range,tensile shear strength (TSS),cross tension strength (CTS),weld spots’microhardness,etc.The following conclusions were achieved:It is easy for both DP980 and Q&P980 steels to get a nugget size bigger than 4 mm,they all have welding current ranges exceeding 2 kA and high weld strength.     

Optimisation of flash welding parameters for wheel rim manufacture using continuously cast steels

Continuously cast steels are nowadays commonly employed for the manufacture of wheel rims, and the flash welding process is generally employed for that purpose. The current work addresses the flash welding of a continuously cast material (carbon steel with carbon segregation in it), in the wheel rim manufacturing process route, with emphasis on the control of process parameters on the quality of weld joints. It has been established in this research work that the controlled post weld heat cycles, during the flash welding process, Improve the quality of joints and also eliminate or at least drastically decrease the failure susceptibility of such flash welded joints during subsequent manufacturing operations.     

高铝310S耐热钢板材的焊接性能简

 对铝含量为2%、4%(质量分数,下同)的310S耐热钢板材采用手工氩弧焊(TIG)的焊接方法进行焊接,利用光学显微镜对焊缝的显微组织进行分析,利用电子探针(EMPA)分析焊接母材的元素分布,并对焊接接头进行室温和高温(800℃)力学性能测试。结果表明：不同铝含量的310S耐热钢板材焊接后的组织均良好,都没有宏观裂纹及夹杂等缺陷;铝元素的加入,抑制了焊接热影响区晶粒的异常长大,细化了晶粒;高铝310S的焊接板材与母材一样具有优良的室温力学性能和高温力学性能,加铝310S耐热钢具有良好的焊接性能。     

国内无取向硅钢未来十五年需求预测与发展建议

根据国内无取向硅钢近十年的发展趋势及下游行业未来的发展前景,对国内无取向硅钢未来十五年需求进行预测。预计至2025、2030和2035年,我国无取向硅钢年需求量分别为1 125万、1 300万和1 500万t;其中,中高牌号比例由目前的20 %分别提升至30 %、40 %及50 %以上。重点发展中高牌号无取向硅钢是大势所趋,但未来中高牌号无取向硅钢将可能面临激烈的市场竞争,应从产品质量与成本控制两个方面提升产品市场竞争力。     

Research on the Welding Process of 590MPa Grade High Strength Automobile Beam Steel

590 MPa automobile beam steel strips are used mainly to manufacture the longitudinal beam of trucks.It’s welding properties are critical to the safety of truck.The microstructure and mechanical properties of welding joints processed by CO 2 arc welding with different welding parameters were studied.The results showed that the welding joints were weak when welding heat input were small and the non metal inclusions were found in the weld joints when welding heat input are big.The quality of the welding joints is good enough at 170A of the arc current and 24V of the arc voltage.Keeping the other welding parameters fixed,the incomplete fusion defect occurred in the welding joint with backward welding,but the quality of the welding joint is good with forward welding.     

Effect of Welding Processes and Consumables on Tensile and Impact Properties of High Strength Quenched and Tempered Steel Joints

Quenched and tempered steels are prone to hydrogen induced cracking in the heat affected zone after welding. The use of austenitic stainless steel consumables to weld the above steel was the only available remedy because of higher solubility for hydrogen in austenitic phase. In this investigation, an attempt was made to determine a suitable consumable to replace expensive austenitic consumables. Two different consumables, namely, austenitie stain less steel and low hydrogen ferritic steel, were used to fabricate the joints by shielded metal are welding （SMAW） and flux cored arc welding （FCAW） processes. The joints fabricated by using low hydrogen ferritic steel consumables showed superior transverse tensile properties, whereas joints fabricated by using austenitic stainless steel consumables exhibited better impact toughness, irrespective of the welding process used. The SMAW joints exhibited superior mechanical and impact properties, irrespective of the consumables used, than their FCAW counterparts.