冷却工艺对经济型热轧双相钢组织性能的影响

以一种低Si含Cr热轧双相钢为研究对象,通过实验室热轧试验,对比研究了两种不同的轧后冷却工艺对获得的双相钢板的组织和性能的影响.结果表明,轧后采用易于控制的连续层流冷却工艺时,钢板的抗拉强度可达600 MPa以上,屈强比约为0.56,延伸率高于26％,n值大于0.22;轧后采用三段式冷却工艺时,钢板强度略低,抗拉强度大于550 MPa,其它性能较优.     

冷却工艺对Si-Mn系热轧双相钢组织和性能的影响

通过热轧试验研究了3种冷却工艺对传统成分Si-Mn系热轧双相钢组织及性能的影响。试验结果表明：在3种冷却工艺条件下,试验钢的最终组织为铁素体和马氏体双相组织。当终轧后采用空冷＋超快冷的冷却工艺时,钢板的屈强比最低,伸长率和n值最大,晶粒尺寸较大,但强度相对最小;当终轧后采用层流冷却＋空冷＋超快冷的冷却工艺时,钢板的晶粒...     

热轧钢板的织构

综述了热轧钢板织构的形成机制和形成特点,分析了化学成分、加热温度、终轧温度、轧制速度、轧后冷却速度以及润滑对热轧织构的影响规律,并描述了热轧织构对热轧板塑性应变比、屈服强度和韧性的影响特点,可为热轧钢板织构和性能的优化与控制提供依据。     

邯钢CSP轧制工艺对HP295钢热轧薄板质量的影响

根据HP2 95钢奥氏体连续冷却转变曲线 (CCT) ,试验了邯钢紧凑式带材生产技术 (CSP)轧制的气瓶钢HP2 95 (0 17%～ 0 18%C ,0 78%～ 0 87%Mn ,<0 .0 2 5 %Ti) 3mm热轧薄板的热轧温度和冷却速度对钢板组织和性能的影响。得出 ,终轧温度为 84 0℃ ,卷取温度不高于 6 5 0℃ ,卷取后强制风冷的工艺措施可细化钢的组织 ,避免钢中出现渗碳体离异共析 ,提高钢板塑性和深冲性能 ,使钢板的冲裂率小于 0 .5 %。     

控制冷却对16Mn钢板组织和性能的影响

前言本文叙述了16Mn钢板的控制冷却实验室研究结果,分为正火控制冷却和热轧控制冷却两部分。实验结果表明,钢板的冷却速度和强制冷却的温度区间对钢板的机械性能与显微组织有明显影响。     

轧后冷却与卷取温度对HP255b钢板织构与深冲性能的影响

通过对半镇静焊瓶用热轧钢板的三维取向分布函数(ODF)的测算与回算反极图的分析。以及塑性应变比的测定,研究了轧后冷却及卷取温度对热轧钢板的织构与深冲性能的影响。     

轧制温度和冷却速率对微合金钢组织和性能的影响

研究了轧制温度和冷却速率对含Nb、Ti微合金钢组织和性能的影响。结果表明,第Ⅱ阶段的开轧温度对轧后钢板的晶粒和强度、塑性影响不大;随着终轧温度的降低,轧后平均晶粒尺寸减小、屈服强度和抗拉强度增加,但钢板的延伸率下降;提高冷却速率,钢板的屈服强度和抗拉强度提高,延伸率呈下降趋势。     

“高温大变形+超快冷”工艺在管线钢生产中的应用

通过热模拟和实验室热轧试验,研究了"高温大变形+超快速冷却"工艺和传统TMCP工艺下试验钢显微组织的区别和强韧性规律。结果表明,超高冷却速率使过冷度变大,形核率升高,新相形核主要以晶内形核为主。"高温大变形+超快速冷却"工艺得到的细化针状铁素体、高密度位错以及弥散细小的析出物保证了材料的综合性能,使热轧钢板综合性能达到了X90标准,并且轧制力比传统TMCP工艺低1 000~7 000 kN。高温大变形后的弛豫过程使组织严重粗化,强韧性明显降低。     

模拟分析冷却热轧钢板雾化喷射角度的影响

利用有限元耦合场数值模拟计算方法对雾化冷却热轧钢板进行了模拟,在固定喷嘴到热轧钢板距离H的情况下,得出喷嘴喷射角度对雾化冷却热轧钢板的影响规律,并对重力作用对雾化冷却的影响进行了研究.     

冷却制度对Ti微合金钢组织性能的影响

以一种Ti微合金钢为研究对象,通过热轧实验,利用SEM和TEM方法,对比研究了三种轧后冷却工艺对获得的钢板组织和性能的影响。利用SEM和TEM方法研究了三种轧后冷却工艺对一种Ti微合金钢组织和性能的影响,结果表明,当轧后采用快冷+空冷工艺和空冷弛豫+层冷工艺时,钢板组织均以粒状贝氏体组织为主,并存在少量珠光体,第二相粒子弥撒分布,尺寸小于10 nm,力学性能良好,且采用后者工艺钢板性能略优于前者;当轧后采用快冷+炉冷工艺时,珠光体组织增多,第二相析出量少,尺寸大,综合力学性能较差。     

Process Control for Structure of Martensite/Austenite Islands of 15.3 mm X100 Pipeline Steel in BX Steel

This paper mainly studies the influence of deformation amount and cooling rate,which existed in X100 pipeline steel rolled at 2300mm rolling mill in BX STEEL,on morphology,size relations and distribution of M/A islands of steel plate structure.Experimental results show that structures of M/A islands are homogenized and refined under the conditions of appropriately increasing the deformation amount in non-recrystallization region on basis of rational deformation amount in recrystallization region and cooling rate after deformation,respectively.Finally,according to the actual situation of 2300mm hot rolling mill,this paper gives rational deformation amount and cooling rate used to obtain ideal structure of M/A islands.     

Q235H型钢轧后强冷工艺对组织和性能的影响

轧后经强冷的Q235H型钢铁素体晶粒大小和机械性能与轧后奥氏体晶粒大小和温降速度密切相关.以马钢现有轧后强冷系统为试验设备,以现有常规轧制工艺为条件,在水压和水流密度不变的前提下,通过改变冷却段的长度,即改变强冷时间,得到Q235H型钢不同温降速度、晶粒大小和机械强度及分布,同时验证了Hall-Petch公式的正确性,...     

Effects of Technological Parameters on Microstructures and Properties of Low Cost Hot Rolled Dual-Phase Steel on CSP Line

The effects of technological parameters on microstructures and properties of low cost hot rolled dual-phase steel was researched by design different finish rolling temperature,mid cooling temperature between laminar cooling and UFC (ultra fast cooling) and stable UFC rate on the same gauge strips with the same chemistry composition during the manufacture process.It is the key for controlling coil temperature to control finish rolling temperature and mid cooling temperature between laminar cooling and UFC that based on stable UFC rate precondition.The lower finish rolling temperature,with mid cooling temperature between laminar cooling and UFC,the better to form martensite is.The foundation of developing the similar productions on the similar product line was supplied.It is good to technological advancement of developing high affixation value production as hot rolled DP steel,TRIP steel etc.in CSP line.     

厚板精整和热处理技术的发展及对策

厚板是现代化生产不可缺少的钢材品种，介绍国外厚板精整技术的发展，包括热矫直机，冷床，表面检查，探伤装置及剪切线，打印，标记等，同时还介绍了国外厚板热处理技术的发展，针对国内厚板生产现状，提出几点对策，尽快配置轧后快速冷却装置，及早采用空轧控冷工艺，进一步开展热处理工艺的开发和研究，加强管理，科学地组织生产。     

轧后冷却工艺对模拟CSP含铜Hi-B钢热轧组织和结构的影响

以模拟CSP工艺-真空感应炉熔炼含铜Hi-B钢(/%:0.06C,3.38Si,0.14Mn,0.013P,0.003S,0.019Als,0.37Cu,0.0015O,0.0087N)模铸成210mm×120mm×60mm板,Φ350mm二辊热轧机1065℃开轧经5道次从60mm轧成3.5mm板(终轧865℃)为试验基板,研究了轧后水冷和轧后水冷至580℃再空冷两种冷却工艺对实验钢组织和织构的影响。结果表明,热轧后水冷到580℃再空冷到室温的冷却方式有助于获得更高取向精准度的高斯织构、更低比例的黄铜织构以及其他合理的织构组成,较轧后水冷工艺更加适合实验钢。     

Evaluation of the fracture toughness of hot-rolled low-alloy Ti-V plate steel

The effects of varying finish rolling temperature (FRT) and cooling rate on the mechanical properties of hot rolled plates of an experimental low-alloy Ti-V steel were studied. Fracture toughness was evaluated for various types of specimens at slow and high deformation rates. However, the transition temperatures determined by the various tests do not always correlate. Therefore, it is recommended that fracture toughness be evaluated by both static and dynamic testing. Following a low cooling rate, the best plate properties are obtained at the lowest FRT in the austenite-ferrite range, although occurrence of delaminations at this temperature may be detrimental for specific applications. Higher cooling rates produce higher strength but lower toughness than lower cooling rates in plates with the same FRT.     

Effect of Cooling Patterns on Microstructure and Mechanical Properties of Hot-Rolled Nb Microalloyed Multiphase Steel Plates

 The effect of the run-out table cooling patterns on the microstructure and mechanical properties of Nb microalloyed steel plates was investigated by hot rolling experiment. The results showed that the mixed microstructure containing ferrite, bainite and significant amounts of retained austenite can be obtained through three kinds of cooling patterns on the run-out table under the same hot rolling condition. Three kinds of cooling patterns possess different austenite transformation kinetics, which leads to variations in microconstituent characteristics. The yield strength increases, the tensile strength decreases and the total elongation tends to increase as the cooling patterns Ⅰ, Ⅱ and Ⅲ were applied respectively. The yield strength, the total elongation and the product of tensile strength and ductility reach the maximum values (547 MPa, 37.2% and 28384 MPa·%, respectively) for the steel plate processed by cooling pattern Ⅲ.     

近10年中国轧钢的技术进步

简要总结介绍了近10年中国轧钢技术进步的情况,其中包括：1)近10年中国钢材产量和品种结构的发展;2)热轧宽带钢、宽厚板、大型冷连轧、三辊连轧管机组生产线的技术集成与开发,以及薄板坯连铸连轧生产线等轧钢装备现代化的发展;3)半无头轧制、薄规格轧制、100 m长尺钢轨轧制,新一代控制冷却技术等轧钢工艺技术的进步;4)轧制过程组织性能控制研究与应用,高性能高强度中厚板、冷轧带钢、长材及管材等生产技术与品种开发。最后,对今后轧钢生产技术的发展作了展望。     

控轧控冷工艺对Nb-V钢的组织性能析出行为的影响

采用光学，电子显微技术和力学分析等方法，系统地研究了不同控轧控冷条件对铌钒复合微合金化低碳热轧钢板的组织和性能的影响规律，提出了较佳的控轧控冷工艺参数，研究结果对开发高强度船体用钢板具有参考价值。     

生产工艺参数对无取向电工钢磁性的影响

宝钢无取向电工钢生产结果表明：冶炼时钢中添加适量Al可降低无取向电工钢的铁损，钢中MnO等夹杂物可造成其磁性明显劣化；随着热轧终轧温度的提高。钢的磁感均明显上升，热轧带钢精轧后慢速冷却时，则晶粒生长充分。改善钢的磁性；冷轧工序中，随着板厚增加，铁损与磁感均提高，酸洗速度的波动会引起带钢磁性的波动。