“分铜液净化渣“综合利用试验研究

介绍了“分铜液净化渣”中回收铜、碲、砷的工艺。小型试验、半工业试验和工业试验结果表明,此工艺过程稳定,确定的工艺参数能满足生产基本要求,过程便于生产操作。     

电解法研制氧化亚铜

对电解法生产氧化亚铜进行试验研究，提出了电解法生产氧化亚铜的工艺方法，确定了最佳工艺条件。试验产品质量达化工行业标准。     

短流程生产无缝钢管的斜连轧工艺

 为解决利用斜轧方法生产热塑性较差、难变形、高合金的无缝管材问题,研究了一种短流程生产无缝钢管的新工艺,即斜连轧工艺,它将传统的穿孔和轧管放置在一道工序中完成,是对两步法生产无缝钢管工艺的探索。首先利用有限元软件对斜连轧工艺进行探索性研究,分析了温度场等的分布情况。进而在斜连轧试验台上对斜连轧工艺展开试验,试验表明,斜连轧工艺能够穿轧出无缝钢管。研究初步获得了新工艺的基本规律,验证了斜连轧工艺的可行性,这种工艺的发展能够有效提高管材产品的质量和生产效率。     

冷轧薄板退火工艺的探讨

本文对冷轧薄板的退火工艺进行了探索。根据对苏联引进的退火工艺的分析,借鉴西德梯森冷轧厂退火工艺,和根据冷轧厂多年退火工艺经验,制定了新的试验工艺,确定了试验工艺参数。试验结果,增加了退火机组产量,节约了能源,提高了产品质量。新工艺在技术上是先进的,适用于实际生产。本工艺应推广到全部罩式炉。     

竖模在金锭浇铸工艺中的试验应用

针对某黄金冶炼厂原铸锭工艺的不足,提出竖模连续浇铸工艺,并对模具尺寸、温度、坩埚等影响因素进行了试验研究。通过批量试验结果表明:采用竖模连续浇铸工艺生产的金锭符合上海黄金交易所的质量要求,且有效提高了生产效率,降低了生产成本,改善了工人作业环境。     

超细三氧化二铁粉的研制

介绍了采用MYD300型干式超细粉碎机生产超细三氧化二铁粉的工艺、试验方法和试验结果。特别是批量生产结果表明,使用该型粉碎机和相应的配套工艺生产的超细三氧化二铁份完全能够达到技术标准的要求。     

高导电稀土－铜排的生产

简要介绍了高导电稀土－铜排生产的工艺试验，从生产实践角度出发，浅述了影响该铜排生产的工艺因素。     

赤泥作新型墙材的研究

通过市场资源调查 ,说明了赤泥作新型建材的必要性和迫切性 ,同时通过实验室试验和半工业试验 ,论证了赤泥、粉煤灰、煤矸石及废渣生产新型墙材的工艺特性及产品特性 ,并通过试验得出三组分工业废渣生产制砖的工艺可行性     

工业铝型材在线淬火工艺实践

介绍了工业铝型材淬火工艺，进行了工业铝型材在线淬火工艺试验。试验表明，“喷雾加淬水”的在线淬火方式最容易控制。该工艺应用于生产实践中取得了较好的效果。     

本钢转炉矩形坯连铸生产GCr15试验

国际先进工业国家均采用电炉（转炉）-炉外精炼-大方坯连铸的工艺生产以轴承钢、齿轮钢等为主要产品的特殊钢。本钢炼钢厂采用LD—LF—RH—CC工艺路径成功地进行了GCr15钢生产试验试制。生产试验结果达到或接近SKF标准,试验过程中积累了经验同时也发现了不足,为今后批量生产此类钢种打下了坚实基础。     

20Mn23AlV钢用低反应性连铸保护渣的开发

20Mn23AlV高锰无磁钢的高铝含量导致连铸过程中钢水与连铸保护渣的剧烈反应,连铸坯产生大量裂纹缺陷,影响其连铸正常生产。为提高铸坯质量,保证20Mn23AlV高锰钢连铸生产顺行,本研究对现场生产20Mn23AlV的连铸工艺和采用的连铸保护渣进行了系统的研究和分析。通过实验室的感应加热炉进行渣-金反应试验,并结合化学分析和扫描电镜等方法研究开发出20Mn23AlV低反应性连铸保护渣,并采用工业试验证明采用低反应性连铸保护渣可以消除连铸坯表面裂纹缺陷,20Mn23AlV高锰钢铸坯修磨量可由8%降低至1%。     

大方坯中低碳钢连铸保护渣研制与应用

在借鉴国内外研究经验的基础上,结合攀钢中低碳钢方坯连铸工艺条件,在实验室进行了保护渣结晶与玻璃化特性协调、吸收夹杂物能力及配碳模式等方面的研究,确定了合理的渣系及物理性能、化学成分.工业试验结果表明,研制的保护渣能够满足工艺要求,可以取代进口保护渣.     

连退工艺对低合金高强钢HC300LA力学性能的影响

为了研究热处理工艺对低合金高强钢力学性能的影响,在连续退火条件下对HC300LA钢进行了模拟试验和工业试验。采用连续退火模拟试验机模拟连退生产工艺,研究了退火温度对低合金高强钢HC300LA力学性能的影响,获得了不同强度要求的试验钢。在实际生产过程中,分别研究了不同均热时间、快冷冷速条件下低合金高强钢HC300LA的力学性能变化情况。试验结果表明,随着退火温度的提高,低合金高强钢的强度下降,断后伸长率有所提高;随着均热时间的延长,低合金高强钢的强度有缓慢下降的趋势;随着快冷冷速的增加,低合金高强钢的强度增加,断后伸长率逐渐降低。     

Continuous cocaine induces persisting changes in behavioral responsivity to both scopolamine and diazepam

Forty-eight male rats were administered continuous cocaine, daily cocaine injections (intermittent), continuous amphetamine, or no drug for 5 days. Beginning 45 days after the administration all groups were tested for their responsivity, as measured by automated activity cages, to a low dose of the cholinergic agonist scopolamine. The continuous cocaine group showed decreased sensitivity to this challenge as compared to the other groups. When tested with a low dose of diazepam, the continuous cocaine group showed the greatest response. However, when observed following an injection of cocaine HCl, the intermittent cocaine group showed the greatest behavioral response. These findings support those of previous studies that indicated that the mode of initial cocaine administration is a key factor in the production of persisting changes in behavior and biochemistry.     

硫化锰形态控制改善亚包晶钢高温塑性的试验研究

在连铸生产过程中,亚包晶钢板坯角部裂纹的发生率较高,严重影响连铸物流和质量。从连铸板坯窄面取样做不同温度下拉伸试验,并在实验室参照钢种成分控制高锰硫比、低锰硫比和低锰硫比下的微量镁处理,从铸锭取样制成高温拉伸样,做对比高温拉伸试验,测定试样在各个温度点的断面颈缩率,观察断口,进行金相分析,观察夹杂物形态。试验得出：该类钢种在800-860℃间出现低塑性,致铸坯在矫直过程中形成角部裂纹。钢种低塑性是由于MnS夹杂物降低了奥氏体晶界初生铁素体相的强度,通过控制MnS形态,特别是钢水经微量镁处理以后,MnS夹杂物得到细化和球化,有效改善了该钢种在该温度区间的高温塑性。该试验结果运用于宝钢连铸生产实践,有效控制了角裂的发生,实现热送。     

CSP薄板坯连铸低碳钢结晶器保护渣的研究

高拉速薄板坯连铸保护渣与常规板坯连铸保护渣在物理性能上有较大差异，通过对保护渣理化性能、熔化特性的研究，确定了适合高拉速薄板坯低碳钢连铸用保护渣的理化指标。     

高伸长率冷轧双相钢DP980显微组织及性能

摘要：为了进一步提高冷轧双相钢DP980的强塑性,采用低C-Si-Mn-Nb-Cr成分,通过调整连续退火工艺参数,系统研究了工艺组织性能的关系,利用OM、SEM、EBSD分析了不同退火温度条件下各相的比例、尺寸、形貌、分布,同时利用力学拉伸试验手段研究了连退两相区退火温度对强塑性的影响。结果表明,通过优化调整连续退火工艺,不仅可以在冷轧铁素体和马氏体双相钢的组织上获得少量的残余奥氏体,也能细化再结晶晶粒,最终获得ReL/Rm≤0.5、高伸长率A50≥15%的冷轧DP980,提高强塑性的同时改善了成型性能。     

The effect of phase continuity on the fatigue and crack closure behavior of a dual-phase steel

The effect of phase continuity on the low cycle fatigue and fatigue crack growth behavior of a Fe-C-Mn dual-phase steel has been investigated. Two microstructures, one consisting of continuous ferrite and the other continuous martensite, were examined. Although there was no difference in the low cycle fatigue lives between the two microstructures, the continuous martensite structure exhibited an extremely high fatigue threshold value of 20 MPa m^1/2, compared to 16 MPa m^1/2 for the continuous ferrite microstructure. A major effect of phase continuity has also been found in the crack closure levels during fatigue crack propagation studied over three decades of crack growth rates. The continuous martensite microstructure exhibited much higher closure levels due to the martensite constraining the plastic deformation in the ferrite and bearing a larger portion of the applied cyclic load. This effect is similar to the extrinsic toughening phenomenon cited in the literature. After accounting for the closure levels the intrinsic or effective fatigue crack growth rates are similar for the two microstructures. These intrinsic thresholds are predicted by employing experimentally obtained low cycle fatigue parameters and the ferrite grain size.     

Quantalization of continuous data for benchmark dose estimation

Benchmark doses corresponding to low levels of noncancer disease risk have been proposed to replace the no-observed-adverse-effect level for establishing allowable daily intakes or reference doses. For quantal data each animal is classified with or without a disease. The proportion of animals with an adverse effect (risk) is observed as a function of dose of a toxic substance. The calculation of a benchmark dose is relatively straightforward. For continuous data a somewhat more complicated designation of risk is required. Because of the more direct procedures with quantal data, consideration could be given to converting continuous data to quantal data before estimating benchmark doses. The purpose of this paper is to compare the precision of the two approaches (use of continuous or quantalized data) for a number of sublinear dose-response curves ranging from low to high probabilities of risk at the highest dose. In these studies, five animals per dose were generally satisfactory to estimate the benchmark dose for continuous data, whereas the corresponding quantalized data generally do not perform as well even with 10 to 20 animals per dose. For quantalized data, the lower 95% confidence limits on the estimates of the benchmark dose were generally a factor of 3 to 4 below the true benchmark dose, whereas the confidence limits using the continuous data were generally within a factor of 2 of the true benchmark dose. Although the use of quantalized data for the estimation of risk is more direct, estimates of benchmark doses using the continuous data were more precise. Based on this study, converting continuous data to quantal data is not recommended.     

薄板坯连铸连轧采用铁索体轧制生产低碳钢板卷工艺技术研究

基于唐钢薄板坯连铸连轧生产线工艺设备，通过理论分析和现场试验，确定了低碳钢板卷铁素体轧制工艺，分析了铁素体轧制板卷组织与性能的关系，以及工艺参数对板卷组织与性能的影响，并指出薄板坯连铸连轧生产线可通过采用铁素体轧制生产性能良好的低碳软钢。