CSP生产SPHC板材的冷轧退火工艺研究

采用酒钢CSP工艺生产的SPHC热轧板,在实验室模拟了不同冷轧及退火工艺,并对冷轧钢板显微组织、力学性能和成形性进行了分析和研究。结果表明,当冷轧压下量为70%、退火温度为700℃时,冷轧板具有良好的织构和优异的冲压性能。     

CSP工艺冷轧钢板的组织形貌和夹杂物的研究

采用紧凑式热带生产工艺(CSP)热轧板为原料生产冷轧钢板,对该热轧板及其冷轧钢板生成过程中各段进行了扫描电镜和金相显微镜的观察,研究了材料组织的演变,并对冷硬板及其退火后冷轧板做了化学相分析.结果表明:CSP热轧板组织中有少量的珠光体和夹杂物,随后的冷轧及退火过程对珠光体和夹杂物的影响较小,退火后的冷轧板最终组织呈分布均匀的长饼状铁素体晶粒.化学相分析表明,冷轧后退火过程中Fe3C的析出量有增加和聚集粗化的现象发生.     

退火张力对冷轧SUS304不锈钢带力学性能和残余应力的影响

基于SUS304不锈钢冷轧后其力学性能和残余应力难于控制,文章根据现场生产条件,采用低温连续张力退火炉对冷轧后的不锈钢带进行相同温度、不同张力的去应力退火,观察并测试该材料在不同张力退火后的力学性能和残余应力的变化规律。结果表明,不同的张力退火工艺对材料的力学性能和内部残余应力有较大的影响。当退火温度在580℃、退火张力在6kg·f/mm2时,SUS304奥氏体不锈钢带常温屈服强度和抗拉强度值最大;在此退火张力条件下,其内部残余应力分布最均匀,板形最好。     

S08Al冷轧板退火态组织和织构特征

采用OM、SEM、XRD等方法,试验研究了S08A1热轧板冷轧退火后的组织、织构特征及其力学性能。结果表明:冷轧退火后组织与热轧态差别较大,随退火温度升高,晶粒变大,组织更均匀,游离渗碳体的级别降低;650℃和700℃退火后带钢中部的{111}织构强度差别不大。4种退火工艺相比,700℃/6h退火后带钢的综合力学性能最好。     

SUS304不锈钢3/4H硬态产品冷轧生产工艺

304硬态不锈钢根据其硬度不同可分为1/4H、1/2H、3/4H和H四种。为进一步开拓不锈钢市场,逐步完善本钢不锈钢品种结构,文章对SUS304钢种的加工硬化曲线进行研究,并结合现有生产条件编制了SUS304(3/4H)硬态钢的试制工艺方案:20辊森吉米尔轧机轧制→冷带退火酸洗机组脱脂清洗→重卷拉矫。本钢不锈钢冷轧丹东有限责任公司进行了冷轧工艺生产实践,成功制成2.23 mm×1250 mm的SUS304(3/4H)不锈钢冷轧产品,力学性能指标、表面质量和板形均达到用户使用要求。     

铸轧卷中间退火对成品退火的影响

通过试验数据说明中间退火工艺对铸轧卷坯冷轧至成品厚度后的成品退火工艺及退火后力学性能的影响,理论上分析讨论了产生这种影响的原因。     

SCM435热轧板卷生产实践

本钢针对客户的使用要求设计了SCM435热轧板卷的生产工艺。通过钢水纯净化处理,将非金属夹杂物控制在1.0级以下;通过精确的化学成分调整,获得了稳定化学成分;连铸过程控制过热度、拉速和保护浇铸,并采用液芯压下技术,获得了质量良好的铸坯;铸坯热送至加热炉中,热轧温度控制稳定,成功生产出热轧板卷,各项性能达到了客户的期望。SCM435热轧板卷在印度某工厂经酸洗、分条、冷轧、退火、落料加工等工序后,生产出合格的链条钢片。     

热轧板退火工艺对19Cr2M01W铁素体不锈钢织构与成形性能的影响

以一种含W和稀土Ce的444型耐热铁素体不锈钢19Cr2Mo1W为材料,利用XRD测试分析、EBSD取向成像技术、粗糙度测量和成形性测试等手段,研究了该铁素体不锈钢热轧板不同退火工艺对其冷轧退火板的微观组织、织构演变以及成形性能的影响。结果表明,尽管采用了不同退火温度的热轧板退火工艺,但是热轧退火板的织构特征在一定程度上均会遗传至冷轧板;热轧退火板中增强的{223}■和{111}■织构组分存在,有利于增加冷轧退火板中γ纤维织构的强度。冷轧板中{001}■～{115}■纤维织构组分越强,退火后γ纤维织构偏离理想程度越大;适当提高热轧板退火温度可以有效减弱冷轧板中有害的{001}■～{115}■组分。提高热轧板退火温度,可以显著减轻甚至彻底消除热轧退火板中的带状组织、提高冷轧退火板的组织均匀性和γ纤维织构强度,有利于成形性能的提高。     

304不锈钢冷轧及退火工艺优化的实验研究

以304不锈钢为实验材料,对其退火和冷轧后的性能和组织进行检测和观察,分析了冷轧变形量和退火工艺对304不锈钢组织和性能的影响.结果表明:增大冷轧压下量,退火工艺为1100℃×5 min时获得较高的r值.     

罩式炉退火钢卷氧化色成因的分析及预防

冷轧钢卷罩式炉再结晶退火主要任务是将经过冷轧的钢卷进行再结晶光亮退火,以满足用户对钢卷不同力学性能的要求.采用紧卷退火方式,在保护气氛中加热.     

Microstructure,texture and grain boundaries character distribution evolution of ferritic stainless steel during rolling process

In order to better understand the texture, microstructure and grain boundaries character distribution evolution of ferritic stainless steel, the texture, microstructure and grain boundaries character distribution of ferritic stainless steel (hot rolled sheet, cold rolled sheet and annealing sheet) with 11 wt%Cr content were studied using X-ray diffraction and electron back scattered diffraction technique. The texture of the hot and cold rolled sheets has a through-thickness texture gradient. In the center layer of the hot and cold rolling sheet, α-fiber texture was observed which was attributed to ideal plane strain deformation. Close to the surface a Gross orientation was detected which was attributed to shear deformation. During annealing, the γ-fiber was formed attributed to recrystallization process. The microstructure of the hot and cold rolled sheets was non-homogeneous through the sheet thickness, while, the microstructure of annealing sheets was homogeneous through the sheet thickness. Grain boundaries character distribution results show that there are many low angle grain boundaries in hot and cold rolled sheets and many high angle grain boundaries and coincidence site lattice after annealing. The above results indicated that the changes in texture are closely related to the grain boundaries type.     

冷变形及退火工艺对低温用奥氏体不锈钢组织性能的影响

采用冷轧试验、退火试验、组织观察及力学性能检测等手段,研究了冷变形及退火工艺对低温用304L奥氏体不锈钢组织性能的影响。结果表明,随着冷轧变形量的增加,冷轧态组织晶粒沿着轧制方向被拉长后被破碎,形变带的密度逐渐增加,冷轧态钢板的强度提高,伸长率下降。随着退火温度的升高,再结晶晶粒尺寸逐渐变大,1120℃以后晶粒长大趋势明显提升,退火态钢板的强度降低,伸长率提高。退火时晶粒长大表观激活能随着冷变形量的增加而提高,在低温退火时,随着冷轧变形量的增加,晶粒尺寸逐渐减小,强度提高,伸长率下降,高温退火时趋势正好相反。     

IF钢铁素体区轧制对带钢最终性能的影响

采用铁素体区轧制工艺能够大大提高IF钢冷、热轧带钢的深冲性能。本研究通过工业试验验证了铁素体区轧制工艺的可行性。试制带钢组织、织构及性能检测的结果表明：热轧带钢1/4厚度处和芯部初步形成了γ织构,连续退火冷轧带钢中形成了强烈的γ织构,冷轧带钢的伸长率达到50%以上,r值达到3.15,具有优良的成形性能。     

冷轧工艺对304不锈钢抛光表面缺陷的影响分析

为了研究冷轧工艺对 304不锈钢抛光表面的影响,现进行两种不同的冷轧工艺对比：普通轧制工艺和抛光料专用轧制工艺。分析两种轧制工艺中表面形貌的变化规律,以及研磨抛光后的表面缺陷。讨论得出通过增加冷轧工艺的轧制道次以及降低各道次压下量,表层金属在轧制过程中能完全覆盖热轧原料凹坑,减少冷轧板表面凹坑的产生,最终显著提高 304不锈钢的抛光表面质量,降低表面粗糙度。     

热轧工艺对超纯Cr17铁素体不锈钢成形性能的影响

对一种铌、钛双稳定化的超纯Cr17铁素体不锈钢分别进行常规热轧和低温热轧,再依次进行相同的退火、冷轧及最终再结晶退火处理。对比研究两种热轧工艺对组织、织构演变及成形性能的影响规律。结果表明,与常规热轧相比,低温热轧能显著细化热轧组织、弱化α纤维织构并强化γ纤维织构,最终使冷轧退火板的γ纤维再结晶织构明显增强、偏离{111}<121>组分的程度显著降低,使珋r值增大、△r值减小。低温热轧是改善超纯Cr17铁素体不锈钢成形性能的有效途径。     

The effect of cold rolling regime on microstructure and mechanical properties of AISI 304L stainless steel

In this paper, the effect of different thickness reductions by cold rolling on the microstructure and mechanical properties of AISI 304L austenitic stainless steel were investigated. The hot rolled steel strips were subjected to cold rolling at 0 °C from 10 to 90% thickness reduction. Microstructures, strain-induced martensitic transformation and mechanical properties of the cold-rolled specimens were characterized by X-ray diffraction, Feritscope measurements, optical metallography, hardness and tensile tests. The resulting transformation curve showed a sigmoidal shape with the saturation value of strain-induced martensite of approximately 100%. A good agreement was found between the experimental results and the Olsen–Cohen model. The results indicated that formation of strain-induced martensite clearly resulted in a significant strengthening of the steel.     

冷轧薄板再结晶温度研究

在冷轧薄板的生产过程中,金属晶粒将沿着变形方向被拉长。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。     

高纯Cr17钢板厚方向织构演变、成形性能及表面皱折

以高纯Cr17铁素体不锈钢为实验材料,对比研究了热轧不退火、退火两种工艺对其板厚方向织构演变、成形性及表面皱折的影响。采用金相显微镜、X射线衍射技术及背散射电子衍射技术观察两种工艺条件下的组织和织构演变。结果表明:成品板各层织构特征存在显著差异,这是由于低温轧制过程中沿板厚方向不同应变状态导致的热轧织构梯度遗传所致。与热轧不退火相比,热轧退火有利于成品板各层γ纤维再结晶织构增强,偏离{111}<112>组分的程度减弱,α纤维织构弱化;有利于弱化成品板的带状晶粒簇,促使晶粒簇分布均匀分散。     

不同制度轧制的冷轧带钢退火后的组织性能

采用奥氏体区和铁素体区二种工艺制度的热轧试验,对退火后深冲冷轧带钢试样的组织性能进行了研究.结果表明:深冲冷轧带钢热轧采用铁素体区轧制,性能指标达到标准要求,可获得更加优良的深冲性能.     

Influence of Finish Rolling Temperature on Microstructure and Mechanical Properties of a 19Cr1.5Mo0.5W Ferritic Stainless Steel

A 444-type heat-resistant ferritic stainless steel containing 0.05 wt% Ce(rare earth element) and 2 wt%(Mo+W) was adopted as an experimental material to study the effect of finish rolling temperature on microstructure and texture evolution as well as on mechanical properties and formability.The rolling processes contain hot rolling at two different finish rolling temperatures(860℃ and 770℃) and annealing,cold rolling and subsequent annealing.It was found that the microstructures after hot rolling and annealing could be refined by lowering finish rolling temperature.The resultant microstructures after cold rolling and annealing were hereditarily refined.Lowering finish rolling temperature can weaken α-fiber texture in hotrolled or cold-rolled ferritic stainless steel strip,while γ-fiber texture in the final product was homogeneously strengthened.Additionally,enhanced mechanical property and formability in terms of strength and average plastic strain ratio could be obtained via decreasing finish rolling temperature.