Φ10mm带肋钢筋四线切分轧制技术的开发与应用

介绍了Φ10mm热轧带肋钢筋四线切分工艺孔型系统的设计、导卫系统的选择以及轧制过程中调整操作要点.同时,介绍了山东石横特钢集团轧钢厂Φ10mm带肋钢筋四线切分轧制的技术经济指标,经济效益显著.     

φ10mm带肋钢筋四线切分轧制 技术的开发与应用

介绍了φ10mm热轧带肋钢筋四线切分工艺孔型系统的设计、导卫系统的选择以及轧制过程中调整 操作要点。同时,介绍了山东石横特钢集团轧钢厂φ10mm带肋钢筋四线切分轧制的技术经济指标,经济效益显著。     

全球最薄热轧带钢在宝武批量轧制成功

正近日,武钢条材总厂CSP产线首次以单块轧制的方式连续成功生产出全球最薄热轧带钢——0.8 mm热轧卷,成为全球首创。0.8 mm是热轧宽带钢理论上能轧制出的最薄厚度的带钢产品,是衡量一条热轧产线工艺装备、技术操作保障能力和工艺控制水平等的试金石。国际上能批量生产的最小厚度规格热轧卷为1.2 mm,在1.2 mm的基础上,厚度每轧薄0.1 mm,生产难度成倍增加。国际上仅有少数几条产线利用     

全球铝轧制工业概览系列综述之十三：加铝-大韩铝业公司

1999年9月加拿大铝业公司收购了大韩线缆公司荣州轧制厂、组建成加铝-大韩铝业公司（ATA），加拿大铝业公司占66%股份，2000年。ATA公司收购了现代集团的韩国铝业公司蔚山轧制厂，从此，ATA公司拥有荣州轧制厂和蔚山轧制厂及一个研究中心，目前，ATA公司热轧板带生产能力500kt/a，冷轧带材生产能力300kt/a，荣州轧制厂将增建2台大型冷轧机，到2005年公司冷轧带材的生产能力将增加到500kt/a，成为世界上最大的铝板带轧制厂之一，荣州轧制厂有1条（1 3）式2438mm热连轧生产线、1条1676mm双机架冷轧机生产线、1台2235mm4辊不可逆式冷轧机，蔚山轧制厂有1台2800mm单机架4辊可逆式双卷取热轧机，2台2250mm4辊不可逆式冷轧机。     

全球最宽的五套铝箔轧机

在全球最宽的五套铝箔轧机中，中国有其二。它们是，德国联合铝业公司（VAW）格雷文布洛施轧制厂（Grevenbroich）的“铝箔２０００（Foil２０００）”工程，于１９８６年投产，由粗、中、精轧机组成，最大轧制速度２５００m/min，可生产２０８０mm宽的０．００６mm厚的箔；中国渤海铝业有限公司的２２００mm铝箔轧机（粗轧机Φ３６０/１０００mm×２２００mm、中轧机Φ２８０/１０００mm×２２００mm、精轧机Φ２８０/１０００mm×２８００mm），１９９４年投产，可生产宽１８５０mm的０．００７mm厚的箱，英国戴维公司设计制造（Davy）…     

攀钢HC冷连轧机轧制数学模型优化

针对攀钢HC冷连轧机带钢轧制存在较严重的厚度超差问题，对轧制数学模型参数进行了优化，并进行了实际应用，薄带（h≤0.6mm)超差率降低25.4%，中厚带钢（h≥0.6mm)超差率降低33.4%。     

初轧机多角孔型轧制大圆钢实践

通过对初轧制大圆工艺特点的分析,提出多角孔型系统是其较稳定的孔型系统,并简要介绍了Φ850mm初轧机轧制Φ180mm圆钢的工艺过程。     

409L不锈钢热轧过程模拟

轧制压力是轧制过程中的重要参数之一,下压率、轧辊直径是影响轧制压力的重要因素.利用DEFORM-3D软件对409L不锈钢的轧制过程进行了有限元数值模拟.建立了下压率为10％、20％、30％,轧辊直径为300、350、400mm的数值模型.分析了不同参数下轧制过程中的轧制压力变化,以及轧制过程中应力、应变分布.模拟结果表明,轧制压力、应力、应变随下压率和轧辊直径的变化而变化,并呈现一定的变化规律.     

轧制头部翘曲因素的研究

通过分析4300 mm轧板头部上下表面温差、轧制线高度、压下率大小、上下工作辊辊径配比、上下轧辊线速度配比等对钢板头部翘曲的影响,结合现场实际情况,找出了主要影响因素。在此基础上,通过上下表面温度控制、4300 mm轧机轧制线高度自动控制方法优化、轧制道次二级模型分配算法优化等方法 ,实现了轧制过程头部翘曲的优化控制,实际应用效果良好。     

应用四线切分技术轧制φ13 mm韩标钢筋

针对KS D 3504:2009韩国标准13mm钢筋成品截面和性能的特殊要求,日照钢铁有限公司在其第二棒材生产线上应用四线切分轧制技术和轧后控制冷却技术开发了既满足韩标要求、又满足负偏差轧制要求的孔型系统、化学成分及轧后穿水工艺,并对精轧机组料型、导卫、轧机弹跳等进行改进,减少了堆钢次数,提高了小时产量。     

Fe-15Ce合金在H2-CO2、H2-H2S及H2-H2S-CO2气氛下的腐蚀

研究了600℃时Fe-15Ce合金在H2-CO2、H2-H2S及H2-H2S-CO2 3种气氛中的腐蚀行为，Fe-15Ce合金腐蚀后发生了Ce的内氧化或形成了复杂的腐蚀产物膜，而未出现Ce的选择性氧化或硫化，这主要是合金中存在着两相及Ce在Fe中极低的溶解度的结果。Fe-15Ce合金在本实验条件下的氧化-硫化腐蚀速度低于相同温度、压力下的纯硫化。     

用氢-氧取代氧-乙炔作焊接切割的必要性及可行性

阐述了用氢代乙炔的必要性．通过时HGQU2000／315火焰电孤焊割机的考察和试用证实了用氢代乙炔的可行性，比较了两种气体的性质并提出了使用特性差异和注意事项．提出了进一步探索的问题。     

Thermodynamics and phase diagrams in the binary systems Na2O-SiO2, Na2O-GeO2, Na2O-B2O3, Li2O-B2O3, CaO-B2O3, SrO-B2O3, and BaO-B2O3

We applied our model to the enthalpy of mixing data of the binary systems Na₂O-SiO₂, Na₂O-GeO₂, Na₂O-B₂O₃, Li₂O-B₂O₃, CaO-B₂O₃, SrO-B₂O₃, and BaO-B₂O₃. The most stable composition in the liquid, that is where the enthalpy of mixing is most negative, is with a metal-oxygen ratio of 4 to 3, for monovalent metals (Na and Li) and 3 to 4 for divalent metals (Ba and Ca) in liquid silicates or borates. The same applies to the CaO-SiO₂, CaO-Al₂O₃, PbO-B₂O₃, PbO-SiO₂, ZnO-B₂O₃, and ZnO-SiO₂ systems. The oxygen to metal ratio, its constant value in various types of systems, reflects and describes the structure of the liquid. Using the analyzed enthalpies of mixing data and the available phase diagrams, we calculated the enthalpies of formation of the various binary compounds. The results are in excellent agreement with data in the literature that were obtained from direct solid-solid calorimetry.     

IrO2-MnO2中间层Ti/RuO2-TiO2-SnO2电极制备及性能

通过热分解法制备了含IrO2-MnO2中间层Ti/RuO2-TiO2-SnO2电极,采用SEM、EDX、XRD、CV等检测方法对中间层进行表征,同时采用强化加速寿命试验对电极电化学稳定性进行表征。结果表明:450℃时前躯体完全氧化并形成固溶体,制备的中间层晶粒细小,表面结构致密,电化学孔隙率小。添加中间层使Ti/RuO2-TiO2-SnO2电极强化寿命由未加中间层的7.5h提高到995.8h,远高于国家标准20h。     

ACTIVITY OF La_2O_3 IN LIQUID La_2O_3-CaF_2 AND La_2O_3-CaF_2-CaO-SiO_2 SLAGS

用石墨为还原剂,将渣中La_2O_3还原入液态Sn,以测定1500℃下La_2O_3-CaF_2和La_2O_3-CaF_2-CaO-SiO_2渣中La_2O_3的活度.对La_2O_3-CaF_2系,并用Gibbs-Duhem积分法求得CaF_2的活度. 根据液态渣的离子结构模型,对上述二渣系中La_2O_3的活度数据进行了简单的讨论.     

Mechanoluminescence in BaSi2O2N2:Eu

Mechanoluminescence (ML), a general term for the phenomenon in which light emission occurs during any mechanical action on a solid, can be divided roughly into two classes: destructive ML and non-destructive ML. For practical use in high-end applications (e.g. pressure sensors), materials with non-destructive ML properties are preferred. This paper reports on the strong non-destructive ML in BaSi₂O₂N₂:Eu. When irradiated in advance with ultraviolet or blue light, this phosphor shows intense blue-green light emission upon mechanical stimulation such as friction or pressure. The ML has an emission band peaking at 498 nm, which is ～4 nm red-shifted compared to the steady-state photoluminescence. The origin of the ML is discussed and related to the persistent luminescence of BaSi₂O₂N₂:Eu. The same traps are responsible for both phenomena. Based on the occurrence of ML in this phosphor, we were able to show that the predominant crystallographic structure of BaSi₂O₂N₂:Eu belongs to space group Cmc2₁.     

氢分子在贮氢材料Li2MgN2H2表面的吸附与解离

采用第一性原理计算方法研究了Li-Mg-N-H体系贮氢材料的放氢产物Li2MgN2H2的吸氢反应过程中的过渡态、表面电子态密度和表面能。结果表明:氢分子在Li2MgN2H2低指数表面中最低能量(100)表面的Mg-Mg-Li穴位吸附位置能够形成最稳定的吸附结构并发生解离,氢分子吸附能为-0.1898eV,解离能约为0.84eV(81kJ/mol),表明该反应所需的反应活化能仍较高,吸氢反应速度缓慢。     

Thermodynamic evaluation of phase equilibria in the CaCl2-MgCl2-CaF2-MgF2 system

The phase diagram of the CaCl₂-CaF₂-MgCl₂-MgF₂ reciprocal ternary system was calculated thermodynamically from available data on the common-ion binary subsystems and from available data on the CaCl₂-MgF₂ join. This join is very nearly quasibinary and divides the system into two quasiternary systems: the CaCl₂-MgF₂-CaF₂ system with a ternary eutectic calculated at 724 +-5 °C and the CaC₂-MgF₂-MgCl₂ system with a ternary eutectic calculated at 561 +-5 °C.     

The Quasi-Ternary System Cu2Se-Ga2Se3-GeSe2

The quasi-ternary system Cu₂Se-Ga₂Se₃-GeSe₂ was investigated using the methods of differential thermal and x-ray analysis. An isothermal section at 770 K and a liquidus surface projection of the phase diagram were constructed. The existence of the quaternary phase CuGaGeSe₄, the boundaries of solid solutions ranges of the system compounds were established.     

High temperature corrosion of Fe-Cr-Mn-alloys in H2-H2S and H2-H2O-H2S gas mixtures

The sulfidation of Fe-20% Cr-30% Mn, Fe-25%Cr-20%Mn and Fe-25% Cr was studied at 700°C in H₂-H₂S and the oxidation and sulfidation in H₂-H₂O-H₂S after preoxidation in H₂-H₂O. The sulfidation rate is strongly increased for the Mn-containing alloys, layers of (Mn,Cr)S and (Mn,Fe)Cr₂S₄ are formed. Also the oxidation rate is enhanced compared to Fe-25% Cr by formation of MnCr₂O₄ instead of Cr₂O₃. The sulfidation after preoxidation leads to internal and external sulfidation of the Mn-containing alloys. With increasing oxygen pressure p(O₂) = 10^?26…10^?22 atm. of the H₂-H₂O-H₂S mixtures the sulfidation is suppressed, for the higher oxygen pressure 10^?23 and 10^?22 atm. fast oxidation prevails under formation of MnCr₂O₄. Manganese cannot increase the sulfidation resistance of alloys, in spite of the stability and low degree of disorder of its sulfide, since the mixed sulfide (Mn,Cr)S is formed which has a high degree of disorder, high diffusivities and high growth rate according to the doping effect of trivalent Cr³⁺.