转炉冶炼20CrMo钢的生产实践

介绍了石家庄钢铁有限公司转炉生产20CrMo钢的工艺技术及其产品质量状况和这一新工艺所带来的显著效益。     

制盐设备用不锈钢及复合板的选材

OOCr18Ni5Mo3Si2(以下简称18－5）属铁素体（α）－奥氏体（γ）双相不锈钢，具有良好的耐Cl^-点蚀和应力腐蚀性能，18－5不锈钢复合板因其兼备优良的使用性能和较低的制造成本，在制盐领域不锈钢材料中，是理想的选择。本就OOCr18Ni5Mo3Si2双相不锈钢及复合板的性能、特点以及在制盐领域的成功事例作一介绍。     

含Zr低合金高强度钢中夹杂物的特性

用电子探针研究了含Zr低合金高强度钢中夹杂物的形貌、大小及分布等特性。结果表明 ,钢样中的夹杂物为圆形 ,呈分散分布 ,其组成系含ZrO2 的复合夹杂物 ,而且MnS依附此复合夹杂物成核和长大。钢中添加少量Zr可明显改善夹杂物形态和分布 ,从而改善钢的强度和韧性     

普通热轧钢材的合理洁净度及生产工艺探讨

钢凝固前、后生成的非金属夹杂物形貌和在钢中的分布特点不同,凝固前生成的夹杂物尺寸较大,在钢中随机分布,主要影响钢材的疲劳强度和延性等性能。凝固后生成的夹杂物尺寸小,主要在晶界富集析出。硅锰脱氧钢脱氧后钢液仍含有20×10-6以上溶解氧,这部分溶解氧在钢凝固后绝大多数会转变为微细的氧化物或氧硫化物夹杂。钢凝固后生成的夹杂物主要影响钢材的冲击韧性、韧-脆转换温度等性能。 对热轧长型材用普碳钢和低合金钢不必采用铁水脱硫预处理,对热轧钢板用普碳钢可采用铁水轻度脱硫预处理,对热轧钢板用低合金高强度钢可采用铁水脱硫预处理、炼钢过程抑制回硫和出钢过程脱硫的工艺。对超低硫低合金钢,在钢水炉外精炼脱硫处理过程钢-渣间须维持非常低的氧势,炉渣成分应控制在CaO:SiO2:Al2O3=60％～65％:4％-8％:30％～35％范围。 普通热轧长型材用钢脱氧后溶解氧含量可放宽至(30-50)×10-6,对中、厚板钢溶解氧含量必须较严格控制,最好采用铝脱氧将溶解氧控制在较低的水平,并将T[O]含量控制在50×10-6以下。采用降低炼钢终点钢水氧含量、出钢挡渣、CAS和CAB等较简易炉外精炼方法和防止铸坯夹渣等措施,能够生产满足普通热轧钢洁净度要求的高品质钢材。     

Effect of Rare Earth Elements on Thermal Fatigue Property of Low Chromium Semi-Steel

The effect of rare earth elements on eutectic carbide‘s morphology of low chromium semi-steel in as-cast state and after heat treatment was investigated, and accordingly, the thermal fatigue property of this material was studied. The results show that RE can improve the eutectic carbide‘s morphology, inhibit the formation and propagation of thermal fatigue cracks, therefore, promote the thermal fatigue property, which is more noticeable in case of the RE modification in combination with heat treatment. The optimal thermal fatigue property can be obtained when treated with 0.2% RE modification as well as normalization at 950℃ for 3h.     

特钢长型材轧制技术新进展

在可持续发展原则指导下，强化控轧控冷、高精度轧制和改进表面与外形质量是当前特钢轧制技术发展的重点。     

大型机械搅拌槽槽底结构设计

根据大型机械搅拌平底槽槽底结构的设计实践 ,分析了其设计要点 ,介绍了适用于大型机械搅拌装置的槽底结构。     

60Si2Mn(A)弹簧钢的脱氧工艺

为了提高60Si2Mn(A)弹簧钢的质量,在LF精炼中进行了不同脱氧工艺的脱氧试验。结果表明:采用铝预脱氧、钡合金终脱氧及夹杂物变性脱氧工艺可使弹簧钢的氧含量降低到15×10-6以下,氧化物夹杂中Al2O3的比例小于40%。     

Streaming potential measurements on stainless steels surfaces: evidence of a gel-like layer at the steel/electrolyte interface

Electric charges at the surface of a passive stainless steel are generally considered as concentrated either in the passive film itself, or at the metal/passive film interface, or in the electrical double layer at the film solution interface. Rest potential time dependence after immersion of a passive surface in aqueous electrolytes suggests however that slow processes occur in the onset of the surface charge. Specific experiments, such as streaming potential measurements and electrochemical impedance spectroscopy in a thin electrolyte cell, were carried out for understanding better this phenomenon. An AISI 304 type austenitic stainless steel with polished or bright annealed surface finishes was immersed in NaCl aqueous solutions with various pH and chloride concentrations. The streaming potential time evolution shows two steps: a first rapid one (∼2 min) is attributed to the onset of the surface charge. The second step is much slower (approximately several hours) and possibly due to an interphase layer between the passive film and the solution. Following this idea, the whole kinetics is controlled by cation migration across the interphase when the pH is larger than the isoelectric pH (pH_iep), while chloride ions are incorporated in the interphase when pH < pH_iep. Impedance measurements allow determining both the kinetics of charge transport and the thin cell conductivity. When glass is used as reference material for the cell walls instead of stainless steel, the Nyquist plots show a high-frequency response. For stainless steel cell walls, a low-frequency response is observed, attributed to a slow charge reorganisation inside the interphase layer. The charge distribution at metal/electrolyte interface is discussed in terms of a gel-like layer which possibly takes place at the passive film/electrolyte interface.     

一种矿山用钢筋网自动化焊接生产线的设计

设计一条钢筋网自动化焊接生产线，包括经料送料平台、纬料自动分料及上料机构、多点电阻点焊机、接料平台、卸料机械手。从上料到出料依靠电机、汽缸之间的协调工作来实现。并由单片机和PLC实现控制功能，上位机用MCGS组态软件在整个过程监视现场，采集工作状态及参数，起到监控作用。