冷轧薄板连续退火技术的发展

简要介绍了冷轧板带钢连续退火技术的进步,以及世界连续退火生产的发展     

马鞍山钢铁公司将建带卷涂镀作业线

马鞍山钢铁公司将从Fata集团公司引进 2条连续带卷涂镀作业线。 2条作业线在技术上略有不同 ,1号作业线生产热浸镀锌板、镀锌铁合金退火薄板 ,设计生产能力 15万t/a ,带钢规格厚 0 3～ 1 2mm ,宽 60 0～ 12 5 0mm。 2号线生产热镀锌板、镀锌铁合金退火薄板、镀锌铝合金板 ,与 1号作业线具有相同的生产能力 ,带钢厚 0 5～ 1 6mm ,宽 80 0～ 15 75mm。1号线产品主要用于建筑行业 ,2号线产品将用于建筑和家电行业。整个工程将于 2 0 0 4年春季完工。马鞍山钢铁公司将建带卷涂镀作业线@冯慧…     

冷轧板连续退火技术在宝钢的应用

简要介绍了冷轧板连续退火技术的发展趋势，以及宝钢2030、1420、1550、1800mm4条连续退火生产线的工艺产品设计；主要介绍了1800mm连续退火机组采用的新技术。     

镀锡基板与汽车板连续退火机组主要技术区别

介绍了我国镀锡基板连续退火机组、汽车板连续退火机组的建设情况,从产品、退火工艺和设备配置上分析了镀锡基板连续退火机组和汽车板连续退火机组的主要区别,提出连续退火机组应该向着专用化方向发展,同时要努力丰富产品品种,汽车板连续退火机组应该适应软钢的超深冲性、高强钢强度等级的逐步提高,以及高表面质量等要求;镀锡基板连续退火机组在具备生产DI材能力的同时,应该向着具备直接生产DR材能力的方向发展。     

快速凝固Al-20Si-5Fe合金的退火组织变化

利用XRD、DSC以及TEM方法研究了快速凝固Al 2 0Si 5Fe合金退火态的微观组织、弥散相结构和相转变。结果表明 ,快凝Al 2 0Si 5Fe合金组织中存在两种弥散相 ,δ Al4 FeSi2 和初生Si相。退火温度低于 310℃时 ,δ Al4 FeSi2 相未明显粗化 ;当退火温度高于 310℃时 ,亚稳相δ Al4 FeSi2转变成稳定相β Al5FeSi,β Al5FeSi相随退火温度的提高而明显粗化。高温退火使初生Si相发生一定的重溶和粗化 ,但粗化速率显著低于β Al5FeSi相 ,原因在于合金中Fe元素抑制了Si相的粗化     

高碳钢快速球化退火工艺的研究

通过对高碳钢传统球化退火理论与技术的分析 ,提出了 Ac1 f温度透烧的奥氏体化新工艺。结合生产现场设备及退火质量的检测 ,制定出相适应的快速球化退火工艺 ,不仅提高了球化的质量 ,改善了机械加工性能 ,还使球化加热时间缩短到原工艺的 2 5 %～ 30 % ,球化缓冷到 6 80℃的时间缩短了 5 0 %。     

润滑热轧工艺对SVH409冷轧退火钢板织构的影响

已有报导 ,热轧带钢轧制条件可以改变织构的形成 ,影响钢的加工性能。日本川崎制铁公司钢铁研究所在试验室轧机条件下对ＳＵＨ40 9不锈钢板采取润滑热轧 ,结果在热轧钢板表面层附近{1 1 1 }增加 ,{1 1 0 }减少 ,热轧钢板退火后的织构在 {1 1 1 }～ {5 5 4 }主方位上 ,在这方面已作过报导。现下研究了热轧退火钢板经过冷轧退火后织构和机械性能的变化。试验材采用ＳＵＨ40 9,其实际成分 ( % ) :0 0 0 7Ｃ 0 0 0 7Ｎ 0 2 5Ｓｉ 0 30Ｍｎ 1 1 0Ｃｒ 0 2 5Ｔｉ,系 1 0 0ｋｇ真空炉熔炼 ,在试验室条件下轧制 ,在 1 1 0 0℃加热轧制成…     

Zr对钐铁合金微结构和相组成的影响

研究了添加0．5at％和1．0at％Zr对钐铁合金微结构和相组成的影响。添加和不添加Zr的Sm-Fe合金相比，发现添加1．0at％Zr可以基本消除铸态组织中的α-Fe，并且能同时减少富钐相。多添加18at％Sm的Sm-Fe合金退火后，仍残留少量的α-Fe，而添加1．0at％Zr的Sm-Fe-Zr合金退火后主相Sm2Fe17以及α-Fe的量没有明显的变化，因此有可能避免过长的均匀化退火过程。     

不同连续退火机组DC06钢种同质化的工艺改进

针对本钢两条连续退火线生产的DC06钢种存在性能差异问题,以1#连续退火线性能为基准,对2#连续退火线采取降低退火温度和提高平整延伸率的措施提高其强度。在保证产能的前提下,通过对2#连续退火线退火温度降低25 °C及平整延伸率提高0.1%的调整后,在实现了两条连续退火线DC06性能同质的同时又节约了能耗,降低了成本,提高了市场竞争力。     

二阶连续退火新工艺研究及实践

介绍了利用步进式连续淬火炉-回火炉设备,通过控制加热制度和冷却速度,实现完全退火处理目的的二阶连续退火新工艺。采用该工艺批量退火处理的1Cr5Mo(12Cr5Mo I)、T9(12Cr9Mo I)等合金钢管材,其各项指标满足标准及使用要求。生产实践表明:二阶连续退火工艺技术能大幅度提高合金钢、高合金钢的退火热处理效率,节约能耗和时间,有利于企业降本增效,具有推广应用价值。     

镀锌板冲压开裂缺陷分析

湖南华菱涟源钢铁有限公司在其原用于生产建筑板及低档家电板的镀锌线上开发了EDDQ产品,但冲压作业中出现了冲压开裂问题。为此,分析了现有镀锌线的生产工艺、冲压润滑工艺和钢中夹杂物等,通过采取将镀锌退火温度控制为850 ℃、给定合理的冲压涂油量、确保模具间隙与材料厚度匹配等措施,实现了DX53D+Z、DX56D+Z系列产品无冲压开裂的批量生产。     

可锻铸铁快速退火与升温降温规律的研究

提出了一项可锻铸铁快速退火的热处理规律，它是一种节能新工艺。通过实验及宏观现象的综合和金属学原理的推理，加以证明。并经过初步应用验证，用它来指导生产，取得了较大的经济效益。     

连续退火和全氢退火工艺及设备的发展

简要介绍了国外连续退火和全氢退火工艺及设备发展概况，技术特点和发展趋势。     

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通过化学成分分析、宏观形貌和微观金相组织检验以及硬度测试试验验证等方法对20Cr13马氏体不锈钢剪切开裂原因进行了研究并提出了改进措施。结果表明,该20Cr13马氏体不锈钢剪切开裂是由生产过程中退火不充分导致晶粒大小不均匀引起的,通过850℃保温16 h的热处理工艺,解决了此次剪切开裂的问题,并提出了针对厚板产品出厂检验增加边部和中心部硬度测试的建议。     

Interficial stability of Cu/Cu(Ru)/Si contact system for barrier-free copper metallization

Films of Cu/Cu(Ru) and Cu(Ru) were deposited on Si substrates by magnetron sputtering. Samples were subsequently annealed and analyzed by four-point probe (FPP) measurement, X-ray diffraction (XRD), transmission electron microscopy (TEM) and Auger electron spectroscopy (AES). After annealing at 500 °C, resistivity values of both systems decrease, but the reduction is more significant for Cu(Ru). Moreover, the resistivity values of annealed Cu(Ru) film are still greater than those of annealed Cu/Cu(Ru) film. XRD data suggest that Cu/Cu(Ru) film has higher thermal stability and Cu silicide cannot be observed up to 500 °C. According to TEM results, after annealing at 500 °C, the grain size of the Cu(Ru) film is smaller than that of Cu/Cu(Ru) film. In conjunction with AES, XRD, TEM analyses and sheet resistance measurement, it indicates that Cu/Cu(Ru) seed layers are potentially good for advanced Cu interconnects from the views of interfacial stability and low resistivity.     

Composition and phase stability upon annealing of gradient nitride coatings

Gradient Ti-Cr-N systems have been formed by cathodic arc vapour deposition in nitrogen atmosphere using simultaneous surface bombardment by metal ions. The deposition was carried out by combining titanium and chromium plasma flows with a variable density.It is shown that gradient by composition coatings with a variable content of metal components in depth are formed. It is established that coatings are mono-(a solid solution of variable composition) or two-phase (a solid solution and titanium nitride) systems.It is established that element and phase composition is stable up to 800 °C. Annealing to greatest temperatures leads to the crystallization processes of a solid solution that ensures the appearance of additional phases (CrN и σ-FeCr). Moreover, it results in the redistribution of chromium in the coating leading to an increase of a solid solution lattice parameter, migration of chromium into the substrate and σ-FeCr formation. The relationship between element and phase composition of coatings is discussed on the basis of a solid solution formation model.     

Effect of annealing on microstructure of CuO-doped (Zr0.8Sn0.2)TiO4

Zirconium tin titanate ceramics, and specifically the (Zr_0.8Sn_0.2)TiO₄ (ZST) are the preferred materials for use in resonators or filters working at microwave frequency. However, the problem with these materials is their high sintering temperature which is as high as 1550 °C. In this research, the influence of different amounts of CuO additions on the densification and microstructure evaluations of ZST ceramics modified with 1 wt% ZnO has been studied in two different states: before and after annealing. Results showed that annealing process at 1250 °C resulted in some changes in density, grain size and shape due to the rearrangement of liquid phase and its reactivation, but no secondary phase was detected. Also, variations in lattice parameters during annealing compared to those of as-sintered specimens suggested the possibility of disorder-order transformation during long time high temperature heat treatment process.     

Springback characteristics in U-channel forming of tailor rolled blank

Residual stress developed during the rolling process of tailor rolled blank (TRB) can affect the springback of finished parts considerably. Springback characteristics of unannealed and annealed TRBs were investigated by means of numerical simulation and experiments taking U-Channel as an example. TRBs were annealed by the annealing process (700 ℃, holding time 10 h), then stamping and springback processes of unannealed and annealed TRBs were simulated, and corresponding experiments were also carried out. Effects of the transition zone length, the blank thickness, the friction coeffcient and the die clearance on the springback of TRB were analyzed. The results demonstrate that the springback of TRB annealed at 700 ℃ for 10 h reduces significantly. For unannealed and annealed U-Channels, the springback of TRB U-Channel is in direct proportion to the die clearance and is in inverse proportion to the transition zone length, the blank thickness and the friction coeffcient. Springbacks of the thinner monolithic (uniform thickness) blank, the thinner side of TRB, the thicker side of TRB and the thicker monolithic blank are sorted in descending order.     

退火工艺对含钛超低碳搪瓷钢板成型和贮氢性能的影响

就罩式退火和连续退火工艺对含钛超低碳搪瓷钢板成型性能和贮氢性能的影响进行了研究。结果表明,试验材料经连续退火后其成型性能较罩式退火好;经罩式退火后钢中析出相的密度(单位体积内颗粒数)较连续退火的大,钢板氢穿透时间延长,氢扩散系数减小。试验材料经罩式退火后其贮氢性能优于连续退火。     

Recrystallization in Oxide Dispersion Strengthened Nickel－base Superalloy MA760

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