SPCC薄板冷轧及连续退火工艺研究

对SPCC薄板进行了冷轧及连续退火模拟试验。研究了冷轧及连续退火工艺对SPCC薄板再结晶组织的影响效果,以及再结晶晶粒尺寸对SPCC薄板力学性能的影响规律。研究发现,经工艺参数优化,可显著降低退火薄板的再结晶晶粒尺寸,同时提高薄板的屈强比性能指标。在晶粒尺寸最为细小的5.23μm SPCC薄板中得到市场上同类产品中最高的屈强比性能。     

冷轧薄板再结晶温度研究

冷轧薄板的生产过程中,金属晶粒经过冷变形,晶粒将随着变形方向拉长。这种变化将导致力学性能等的变化。再结晶退火是冷轧薄板生产过程中的一个重要过程。因此,研究冷轧薄板再结晶温度以及压下率对再结晶温度的影响,对冷轧薄板生产具有重要的实际意义,能够为冷轧薄板生产时退火工艺制度的制定提供理论依据。     

再结晶温度对Fe-36Ni因瓦合金冷轧薄板组织和性能的影响

研究了Fe-36Ni因瓦合金冷轧薄板再结晶过程中显微组织、晶粒取向、硬度值和磁性能的变化规律。结合金相组织、织构、力学性能和VSM等检测分析手段,确定了该冷轧薄板的再结晶温度范围为525~625℃,同时伴有晶粒择优取向发展过程;再结晶过程对冷轧薄板的磁性能没有明显影响。     

CSP热轧及冷轧工艺对深冲板组织和性能的影响

以某钢厂CSP工艺生产的SPHE热轧板为研究对象,在实验室条件下,研究了CSP卷取温度对SPHE冷轧深冲板组织和性能的影响。研究结果表明,CSP工艺生产的SPHE热轧板的卷取温度应控制在560-565℃;冷轧工艺相同时,基于CSP工艺生产的SPHE深冲板的退火温度越高,再结晶进行越充分,晶粒尺寸越大,对性能越有利,尤其是560-565℃卷取的SPHE板在700℃退火时已可以获得很好的深冲性能。     

冷轧薄板晶粒度的评定

金属材料是种多晶体,其晶粒大小与材料的力学性能有着内在的联系。控制晶粒的大小是控制金属材料力学性能的重要手段。在冷轧薄板生产中,再结晶退火是一个关键性的工艺环节。通过控制再结晶退火的温度和时间,使薄板完全再结晶,并达到一定的     

CSP无取向电工钢50 W600组织及织构演变研究

文章研究了CSP无取向电工钢50W600在热轧、冷轧、退火过程组织、织构演变情况,研究结果表明:铸坯为柱状晶组织;热轧板沿厚度方织构是不均匀的,表层主要织构为黄铜织构;脱碳退火板为再结晶组织,平均晶粒尺寸50μm,主要为γ纤维织构。     

00Cr12Ti铁素体不锈钢再结晶织构与成形性的研究

实验室研究了冷轧00Cr12Ti铁素体不锈钢在820℃不同保温时间下的退火工艺,运用电子背散射衍射（EBSD）技术研究了试验钢板再结晶晶粒的显微织构、尺寸和晶界角度分布及其成形性能的关系。试验结果表明：不同保温时间下退火钢板再结晶晶粒的显微织构、晶粒尺寸和晶界角度分布上存在着差异,这种差异反映出不同退火工艺对钢板成形性能的影响。此外,还利用EBSD对不同退火工艺的再结晶程度作了分析。     

CSP条件下稀土微合金钢的静态再结晶行为

研究CSP基料在随后冷轧退火过程中的组织演变与静态再结晶行为,对于力学性能的控制具有重要意义。以普通低碳SPCC钢和加入稀土的低碳SPCC钢为研究对象,冷轧变形71%后分别在560℃到640℃(每隔20℃)进行再结晶退火,退火时间分别为10~2s,10~(2.5)s,10~3s,10~(3.5)s,10~4s。采用光学显微镜观察冷轧与再结晶试样显微组织,运用Image-tool软件统计金相组织晶粒大小,通过分析各温度时间的再结晶百分比,计算了两种钢的再结晶激活能。结果表明,稀土元素能细化再结晶后的晶粒,并提高再结晶温度和再结晶激活能。本实验条件下,未加稀土与加稀土的再结晶激活能分别为148 k J/mol和221 k J/mol。     

CSP工艺冷轧薄板组织演变和第二相分析

采用金相显微镜和QUANTA-400型环境扫描电子显微镜研究了包钢CSP工艺冷轧薄板生产过程中的组织演变,用化学相分析及X射线小角散射法研究了不同状态钢板中第二相的成分、数量及粒度分布。结果表明:包钢CSP薄板坯中复合夹杂物的数量极少。在CSP工艺冷轧薄板生产过程中,热轧板、冷硬板和退火薄板沿宽向边部的组织均较中部的组织细小,且热轧状态下最为明显。作为冷轧基料的CSP工艺热轧板中稳定氧化物夹杂的总量(质量分数)仅约14.3×10-6。冷硬板和退火薄板中的析出相主要为纳米级的M3C型和MC型析出物。冷硬板退火后M3C型析出物的总量比MC型析出物的总量多26～27倍。     

冷变形及退火对薄板5182铝合金微观组织与力学性能的影响

本文研究了冷轧过程中不同的冷变形及退火工艺对薄板5182铝合金晶粒组织、拉伸性能与各向异性影响。研究结果表明,当退火温度在300℃时,5182合金中发生不完全再结晶。随着冷变形量的增加,拉伸强度先增加后降低,延伸率逐渐增加;当退火温度在320℃~380℃时,5182合金中发生完全再结晶,变形量为30%的试样晶粒发生异常长大形成粗大晶粒;而变形量大于50%的试样晶粒发生完全再结晶形成细小等轴晶。随着冷变形量的增加,拉伸强度略有增加,延伸率变化较小。     

Ferritic rolling to produce soft deep‐drawable thin hot strips

In a conventional production of deep‐drawable sheets of steel, a hot rolling in austenite and a cold rolling at room temperature together with a subsequent recrystallization annealing are applied with a cold strip as a final product. As a cost saving replacement for this, a thin‐gauge hot strip with a required deep‐drawability can be employed. A conventionally (in austenite) hot rolled strip is hardly applicable for this because of its unsatisfactory texture as well as because of the technical difficulties to produce hot strips with sufficiently small thicknesses. As a promising realization of cost saving thin‐gauge deep‐drawable hot strips of steel, a warm rolling can be applied with reduced finish rolling temperatures. In this practice the finish rolling is shifted down into the temperature region of ferrite. In the present work extensive laboratory tests on IF‐ and ELC‐steel were carried out by using the hot deformation simulator Wumsi. By the measurements of the texture development as well as by the computing of r‐values, the process parameters of ferritic rolling and a subsequent direct recrystallization in the coil of these steels could be optimized.     

Effects of Ca and B on the Strip Deformation of Cold Rolled Duplex Stainless Steel Type 2205 during Continuous Annealing

The effects of Ca and B on the strip deformation of duplex stainless steel Type 2205 under continuous annealing conditions were investigated. For the creep test, the stresses were calculated from the line tension applied to hot rolled and cold rolled Type 2205 strip during continuous annealing. It was found that the cold rolled Type 2205 steel showed more prominent superplasticity as compared with the hot rolled steel, which could be attributed to the fine grain size of the cold rolled steel. The creep rate of cold rolled Type 2205 steel decreased with the Ca and B additions due to the grain boundary segregation of B. It is suggested that the rate controlling mechanism for the strip deformation of cold rolled Type 2205 steel seems to be grain boundary diffusion in γ phase.     

再结晶阶段加热速度对低碳冷轧板罩式退火过程组织和织构的影响

在实验室条件下模拟CSP热轧板为基板生产的低碳冷轧板罩式退火过程,研究再结晶阶段加热速度对冷轧板罩式退火过程组织和织构的影响。结果表明,压下率83.3%的冷轧板,随着再结晶阶段加热速度的增加,会使试样再结晶温度降低,再结晶过程提前完成,{001}110织构变强,{111}110织构先减少后增加,{111}112织构先减少后增加出现峰值,当加热速度超过50℃/h时又减小。在加热速度30~40℃/h间变形织构{112}110有较低的密度值。再结晶阶段加热速度40℃/h的退火工艺成品组织为饼形晶粒,{001}110织构密度较低,{111}110和{111}112密度较强,密度值接近。     

冷轧压下率对DQ级深冲带钢组织和性能的影响

研究了60%～80%冷轧压下率对3.5 mm CSP热轧板轧制的1.4～0.7 mm冷轧深冲带钢力学性能、组织和织构的影响。结果表明,随冷轧压下率由60%提高至80%,冷轧带钢的再结晶开始温度由560℃降至520℃,成品带钢组织细化;当冷轧压下率为74.3%时,成品DQ级带钢的深冲性能最佳。随冷轧压下率提高,成品深冲带钢△r值逐渐减小,这与成品带钢中{112}〈110〉织构取向函数值f(g)升高有关。     

CSP工艺0.04C钢热轧板冷轧-退火织构的演变

通过实验室4辊轧机和保护气氛管式退火炉，对0．04C钢CSP工艺生产的3姗热轧板进行冷轧（至0．8mm）和退火试验，并用蚀坑法对退火试样进行织构分析；同时对包钢薄板厂CSP3mm热轧板冷轧的1．2姗板卷退火试样进行了X-射线检测。结果表明，1．2mm SPCC冷轧板退火织构表层有较弱的{111}织构组分，中心层没有发现有利于提高钢的深冲性能的{111}织构。1．2mm板卷退火试样{111}／{100}取向密度比为2．0～3．0，与实验室蚀坑法的试验结果一致。     

CSP板卷及冷轧镀锌板表面缺陷分析

为研究CSP及其后续产品的表面质量,对马钢CSP、冷轧和镀锌生产线投产以来出现的主要表面缺陷进行分析,研究结果表明:夹杂类缺陷、边裂和氧化铁皮压入是热轧板卷的主要缺陷,这些缺陷将不同程度地遗传到后续产品.产生表面缺陷的主要原因有钢水质量、连铸和轧制工艺、除鳞工艺和后续设备自身状况等,分析认为提高钢水和连铸坯质量是消除热轧板卷和后续产品表面缺陷的关键.     

Hot direct rolling in ferrite region in extra low-carbon steel

For the first time, hot direct rolling was applied in ferrite region in the mill and the resulting quality of the cold rolled and annealed sheet steel was as good as that hot direct rolled in austenite region with respect to microstructure and mechanical properties. In case of ferrite phase rolling, microstructure of the hot strip reveals abnormal grains and deformation bands in the grains, and elongation and r value are not so good as those rolled in the austenite phase. However, these abnormal grains left no traces and appeared to be equiaxed grains like the austenite phase rolled microstructure after 75 % cold rolling and continuous annealing at 830°C. This is attributed to the deformation bands which provide nucleation sites for recrystallization during annealing so that recrystallization occurs uniformly in the matrix. (111) texture was well developed and r value thus appeared high.     

不锈冷轧带钢表面光洁度的控制

在生产中，不锈冷轧带钢的表面光洁度一般用粗糙度进行控制，其粗糙度越低，光洁度越高。应使用低粗糙度和低微小缺陷面积率的不锈热轧带钢，高的总压下量，低粘度轧制油和平整率达到1％的工艺轧制可获得较高光洁度的不锈冷轧带钢。高速钢轧辊轧制的不锈冷轧带钢的光洁度优于模具钢轧辊。     

CSP工艺生产高牌号无取向电工钢的组织和夹杂物

 首次实现了从冶炼→CSP→常化→冷轧退火→成品检测等CSP工艺生产高牌号无取向电工钢的实验室全工序过程模拟,并对铸坯、热轧板及冷轧板中的组织及夹杂物进行了具体分析。结果表明,CSP工艺生产高牌号无取向电工钢是可行的;成品磁性能满足国际标准要求;薄铸坯、热轧板、成品板组织具有典型高牌号无取向电工钢组织特点;过程析出物主要为：AlN,AlN+MnS。     

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Effect of double cold rolling on magnetic properties and microstructure of 3.98%Si-0.71%Al non-oriented silicon Steel Sheets cast by twin-roll thin strip casting process were investigated. The results show that the structure of the thin strip is equiaxed crystal, the recrystallization is complete and normalizing has lesser effect on microstructure. Using both cold rolled and double cold rolled process, the microstructure is equiaxed grain after final annealing. The average grain size of annealed sheet in double cold rolled specimen was smaller than single stage cold rolled sheet. Double cold rolling process is helpful for iron loss and magnetic flux density.