CSP板卷边部缺陷的研究

针对CSP板卷存在的主要质量问题——板卷边部缺陷，统计分析大生产数据，现场跟踪试验，以及实验室验证，研究查找出CSP板卷边部缺陷的主要影响因素，通过采取相应控制与改善措施，获得了良好效果。     

CSP板卷边部缺陷的研究

针对涟钢CSP板卷存在的板卷边部缺陷主要质量问题,统计分析了大量的生产数据,进行了现场跟踪试验以及实验验证;查找出了CSP板卷边部缺陷的主要影响因素;并通过采取相应的控制与改善措施,获得了良好的效果。     

酒钢CSP热轧钢带边损的相关因素分析

针对酒钢CSP钢带存在边部缺损质量问题,运用统计技术对生产数据统计对比,通过现场跟踪试验以及实验验证:查找出CSP板卷边部缺陷的主要影响因素,并通过采取相应的控制与改善措施,从逐年趋势图对比看,其边损率显著降低,获得良好效果。     

酒钢CSP热CLN带边损的相关因素分析

针对酒钢CSP钢带存在边部缺损质量问题，运用统计技术对生产数据统计对比，通过现场跟踪试验以及实验验证：查找出CSP板卷边部缺陷的主要影响因素，并通过采取相应的控制与改善措施，从逐年趋势图对比看，其边损率显著降低，获得良好效果。     

CSP热轧板卷边部裂纹成因及控制

为了抑制CSP热轧板卷边部裂纹,对CSP热轧板卷边部裂纹的成因进行了研究.CSP热轧板卷边部裂纹缺陷主要有3类:边部横裂纹、边部纵裂纹、边部烂边或掉块等.板卷产生边部裂纹的主要原因是:连铸坯表面边部横裂纹(包括深的振痕)和边部的细小纵裂纹,在加热和轧制过程中不断扩展;钢液在凝固以及铸坯在冷却、均热、轧制、层流冷却和卷取等过程中的热应力、机械应力以及相变应力等作用力超过钢的塑性变形抗力.抑制CSP热轧板卷产生边部裂纹的主要措施是:控制好合适的钢水成分;制定有效的工艺参数,如结晶器热流密度、结晶器振动参数、二冷冷却强度等.工业试验结果表明,CSP热轧板卷边部裂纹率由7.93%降低到1.81%.     

CSP板卷边部裂纹影响因素分析

 对钢中碳含量、Ca/Als、拉速、结晶器振动及二冷制度等工艺因素进行了综合分析，并从理论上对钢中氮含量、钢中铝含量及AlN质点析出等方面进行了阐述，指出了影响CSP板卷边部裂纹的主要因素是结晶器振动和二冷制度，为生产实践中减少CSP板卷边部裂纹发生指明了方向。     

主要精炼工艺参数对边裂的影响分析

薄板坯连铸连轧是世界上最先进的板材生产线，其对精炼炉所提供的钢水有严格的质量要求。成分和温度合适及纯净的优质钢水是CSP顺利生产和生产优质板卷的基本保证，是生产无边裂，无烂边，以及没有各种内部缺陷并且符合性能要求的优质板卷的基础。     

300系不锈钢退火酸洗黑边缺陷分析

不锈钢酸洗板卷以优质的热轧板卷为原料,经过连续退火和酸洗去除氧化皮,表面形成钝化膜,成为表面质量好、机械性能优的冷轧原料.本文主要针对酸洗后板卷黑边缺陷,对钢卷黑边进行微观分析,结果表明钢带边部发黑主要为Fe/Cr氧化物,通过增加退火酸洗产线的抛丸机侧抛设备和高压水冲洗边部装置,黑边缺陷发生率降至1％以内,本文对热酸线和冷酸线的生产具有参考意义.     

CSP热轧SPHC板卷氧化皮厚度分布

研究了CSP热轧SPHC单张板和板卷的氧化皮厚度，并与传统热连轧产品进行了比较。研究发现，从CSP板卷宽度中心至边部氧化皮厚度逐渐增加，且中心到1／4宽处的增加趋势比1／4宽到边部的强；单张板的氧化皮比板卷的厚；下表面的氧化皮比上表面的厚；CSP板卷厚度（h）与氧化皮厚度（x）间呈x=3．95695＋2．09607h关系，而传统热连轧产品则呈x=8．152＋3．132h；CSP板卷的氧化皮较传统热连轧的薄，其厚度对板厚也不太敏感。应以板卷下表面的氧化皮性状作为制定酸洗工艺的基础。     

热轧板卷烂边与边裂的原因分析

采用低倍试验、化学成分分析及金相检验等方法．对出现烂边、边裂（横裂）的板坯、板卷进行了解剖分析。结果表明，钢卷的烂边、边裂等缺陷产生原因与钢坯内在缺陷及加热温度偏高或加热不均匀有关。     

A numerical and experimental study of deformation characteristics of the plane strain punch stretching test

Recently, a simple new test method called the plane strain stretching (PSS) test has been developed to evaluate the stamping formability of sheet materials. The PSS test has been proven to have good reproducibility and show good correlation with press performance. In order to clarify the deformation characteristics of the PSS test and investigate the effect of material and process variables on the performance of the PSS test, three-dimensional finite element simulations for the PSS test were performed and the results compared with experiments.     

对多孔物质或固体粉末比表面积测定方法探讨

本文对氮吸附法测定多孔物质及固体粉末比表面积进行了探讨。实验结果表明样品检测精密度明显提高。     

The micronucleus test as part of a short-term mutagenicity test program for the prediction of carcinogenicity evaluated by 143 agents tested

To evaluate the usefulness of the micronucleus test as a short-term assay for the detection of carcinogens, the correlation between micronucleus test data for 143 chemicals and corresponding cancer data, has been analyzed. For comparison, analogous data from Ames's test have also been collected for the same chemicals. In a comparison of the micronucleus test and Ames's test it was found that they had about the same specificity (around 80%) and predictive value (around 90%), while there was a significant difference in sensitivity in favor of Ames's test. The difference in sensitivity could be partly explained by differences in metabolizing capacities of these two test systems. It is concluded that a more elaborate test procedure for the micronucleus test would increase that sensitivity of this test. The principal value of the micronucleus test lies in the fact that it is an in vivo method, which may pick up effects at the chromosomal level not covered by bacterial assays. This is emphasized by the finding that the combination of Ames's test and the micronucleus test did increase the sensitivity of the screening procedure for the prediction of carcinogenic effects.     

The effect of inertia on tensile ductility

One-dimensional numerical simulations of dynamic tensile tests have been carried out over a wide range of test velocities for materials having aHollomon-type constitutive law with power-law strain-rate sensitivity. A variety of values of the strain-hardening exponent and strain-rate-sensitivity index have been used to analyze the effect of inertia on tensile ductility. Results show that the total elongation of the specimen is enhanced by inertia at high test velocities. This inertial effect varies with the strain-hardening exponent and strain-rate-sensitivity index and can be scaled with the normalized material density and the test velocity. Based on these results, the critical test velocity for the onset of the inertial effect as a function of material parameters has been numerically determined. To account for the effect of inertia on the enhancement of tensile ductility, a simple phenomenological explanation has been proposed.     

板材试批“以厚代薄”功能的研发

在宽厚板试批规则引入"以厚代薄"理念,有效的减少了船检量,缓减公司检验人员、场地、设备压力,缩短了产品检验时间,减少了岗位人员劳动强度,同时提高了板材成材率。     

浅谈金属硬度及硬度试验

简要地综述了金属硬度及其测定方法。目前 ,金属硬度试验方法共有六个国家标准。这六个国家标准包括了所有软硬金属的试验方法。同时 ,按试验力状态 ,将这六个国家标准分为两种 ,静态试验力或动态试验力硬度试验方法。动态试验力国家标准试验方法可测定一些大型工件的硬度 ,拓宽了硬度试验方法的应用范围     

配煤炼焦试验研究

济钢焦化厂利用7kg小焦炉进行张庄气肥煤和邹县煤的炼焦试验及不同配比的炼焦试验，将试验结果用于指导生产，扩大了炼焦煤资源，降低了配煤成本，稳定了焦炭质量。     

A simplified screening test for identifying people with low vision in developing countries

Simple but effective tests have been produced for screening subjects with low vision in developing countries. These tests of distance and near vision, based on the E test, were evaluated and validated in trials with people aged 4-90 years, and have been field tested in the health, education and rehabilitation services in 32 developing countries. Their sensitivity and specificity as screening tools for low vision have been calculated; sensitivity of 85% and specificity of 96% for the distance vision test, and sensitivity of 100% and specificity of 84% for the near vision test. The content and format of the tests have been demonstrated to be appropriate for developing countries, and their effectiveness for screening for low vision has been confirmed.     

Experimental Studies on Supersonic Cold Flow Mixing with Ramp Mixers

The mixing field in a supersonic cold flow past a set of compression–expansion ramps mounted at the downstream end of a strut, with staged injection at two tandem locations on the strut upstream of the ramps, has been experimentally investigated. Air and helium have been used to inject into a primary stream of air at an inlet Mach number of 2.0. Two test section geometries, one having a flow cross section twice that of the other, have been considered. The larger test section has wall struts as well as a middle strut, whereas the smaller one has the strut only in the middle. Terminal bulk pressure and wall static pressure measurements, and Schlieren visualization have been performed. The Mie scattering technique has been used to obtain the concentration contours of the injectant across the flow cross section at several axial locations downstream of the injection points. The results indicate better mixing with helium injection and less influence of the boundary layer along the test section walls with the larger test section, as expected.