Q345A 中板控轧控冷工艺试验

采用外购Q345A连铸板坯,在韶钢2500mm轧机上进行了以“再结晶区 未再结晶区”两阶段控轧及轧后空冷或水冷工艺为主体的中板控轧控冷试验,主要研究了轧制温度、终冷温度对钢板组织和性能的影响,为韶钢“大转炉一中板轧机”生产高强度低合金钢板进行了控轧控冷工艺的技术储备．     

Q345A中板控轧控冷工艺试验

采用外购Q345A连铸板坯,在韶钢2500mm轧机上进行了以“再结晶区 未再结晶区”两阶段控轧及轧后空冷或水冷工艺为主体的中板控轧控冷试验,主要研究了轧制温度、终冷温度对钢板组织和性能的影响,为韶钢“大转炉——中板轧机”生产高强度低合金钢板进行了控轧控冷工艺的技术储备。     

工程机械用高强度钢板控轧控冷工艺的开发

为开发强度级别为６８５ＭＰａ的高强钢板的控轧控冷工艺,研究了终轧温度,未再结晶区累积压下量,终冷温度,冷却速度等工艺参数对钢的显微组织和力学性能的影响。实验结果表明,在控轧控冷条件下,钢的室温显微组织由铁素体和贝氏体组成,贝氏体主要以粒状贝氏体为主,此外,晶粒细化是提高钢的强度和韧性的最有效的手段。     

轧制工艺对Nb微合金H型钢性能的影响

采用透射电镜、电解法对铌（Nb）微合金H型钢析出相进行分析,利用显微镜研究加热温度对奥氏体晶粒度的影响,以及通过轧制试验研究未再结晶区压下率和终轧温度对试验钢性能的影响,制定出微合金H型钢控轧工艺。该工艺应用于微合金H型钢工业生产,其实际晶粒度11级,屈服强度为400~420 MPa,-20℃横向夏比冲击功大于45 J,产品性能满足日标H型钢要求。     

含铌钢碳氮化物二相粒子在控轧控冷工艺中析出规律

针对含Nb微合金化钢，模拟安钢中板厂现有生产工艺，利用透射电镜技术，研究在试验室条件下，通过对试样进行单道次及多道次金属再结晶区和未再结晶区的控制轧制，探讨控轧控冷工艺对Nb碳氮化物第二相粒子析出规律的影响，并结合安钢轧制工艺现状，提出建议。     

普通C-Mn钢超细晶中厚板的带状组织

采用Gleeble2000热模拟试验机研究了普通C-Mn钢的再结晶规律，在实验室轧机上进行了C-Mn钢超细晶中板的轧制，并且在首钢中厚板厂工业轧机上进行了超细晶中厚板的工业试制，研究了工艺条件对中厚板带状组织的影响，分析了带状组织产生的机理。研究结果表明，在靠近静态相变温度Ar3附近的未再结晶区进行大变形量轧制(形变诱导相变)，不仅可以使板材的铁素体晶粒细化甚至获得超细晶组织，而且普通C-Mn钢中厚板中的带状组织减轻1～2级；降低精轧开轧温度有利于减轻板材的带状组织；在未再结晶区控轧有利于减轻板材的带状组织；随着未再结晶区形变量增加，板材的带状组织减弱。     

两相区轧制对低合金钢组织性能的影响

采用再结晶区轧制+未再结晶区轧制+两相区轧制三阶段控制轧制工艺的方法,研究在(α+γ)两相区范围内,两相区不同变形率对Q345C低合金高强度钢组织性能的影响规律。同时比较了三阶段控制轧制工艺与常规TMCP控轧控冷工艺轧后钢板的性能,分析了两相区轧制工艺对钢板组织性能的影响。     

TM8带钢控轧控冷工艺实践

介绍了天铁集团炼钢厂带钢车间用控轧控冷工艺生产TM8带钢的情况,对影响产品性能的因素进行了分析。通过控轧控冷工艺提高了带钢综合性能,节约了生产成本。     

A36 船板控轧控冷工艺实践

通过对韶钢宽板厂A36船板控轧控冷工艺的实践研究,得出A36船板合理的控轧控冷工艺,并分析了钒微合金化和控轧温度对船板性能的影响。     

高速棒材生产线新工艺技术及装备应用

新一代热机轧制技术在轧线高速区施加多级控轧控冷工艺,通过重载型模块轧机,在精轧道次施加足够的总变形量,轧件在未再结晶区反复变形,配合冷却速率控制,钢材晶粒细小均匀,强度高、性能优。山西通才工贸有限公司高速棒材轧钢生产线,首次应用新一代热机轧制工艺技术,高速区采用超重型RVM330系列模块轧机。生产Φ25 mm的HRB400E螺纹钢w(Mn)低至1.1%～1.2%、Φ12 mm螺纹钢w(Mn)低至0.7%～0.8%,屈服强度≥420MPa,实现了低合金成分生产,生产成本大幅降低。     

薄板坯连铸连轧流程钛微合金钢控制轧制技术

 重点阐述了薄板坯连铸连轧流程钛微合金钢的控制轧制模式及其机理。基于应力松弛试验和双道次压缩热模拟试验,研究分析了薄板坯连铸连轧钛微合金钢的奥氏体再结晶动力学。研究结果表明,轧前铸态粗大奥氏体组织经F1高温大压下后可实现完全静态再结晶;铸坯中固析TiN粒子可以有效阻止奥氏体再结晶晶粒的长大,实现再结晶区控轧。固溶钛的溶质拖曳作用以及形变诱导析出的TiC粒子对奥氏体再结晶具有抑制作用,可以阻止奥氏体再结晶的发生,实现未再结晶区控轧。     

终轧温度对高氮奥氏体钢组织和力学性能的影响

通过加压冶炼、控制轧制方式获得氮质量分数为0.59%的Mn18Cr18N钢板,研究了终轧温度对高氮奥氏体钢组织和力学性能的影响。结果表明,在再结晶区轧制并且终轧温度为970 ℃的钢板,组织为奥氏体等轴晶和部分孪晶,强度较低,塑性、冲击韧性较好;终轧温度为910 ℃的钢板,大部分组织为变形奥氏体晶粒,有少量再结晶晶粒,随着终轧温度降低钢板强度升高,塑性和冲击韧性降低;在未再结晶区轧制并且终轧温度为780 ℃的钢板,组织为变形严重的奥氏体晶粒,强度最高,塑性、韧性最低。所有试验钢有晶界析出的Cr₂N相,降低终轧温度和减缓轧后冷却速度,会增加Cr₂N相的析出。     

控制轧制工艺对中厚板性能的影响

介绍了在单机架中厚板厂管线钢生产过程中采用不同的控扎控冷工艺的优缺点,指出实施再结晶区控轧控冷工艺的主要现场工艺条件。     

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.     

60Si2Mn弹簧钢的控轧控冷工艺

弹簧钢60Si2Mn经奥氏体再结晶区1000℃控轧,轧后以6－10℃/s的冷速进行控制冷却,可获得细小的珠光体＋少量铁素体组织,同时减少了脱碳,显著提高了弹簧钢的冲击韧性。     

Effect of Nb on Austenite Recrystallization in High Temperature Deformation Process

By analyzing the stepped test pieces with optical microscope,the influence of the technological parameters including rolling temperature and reduction on the austenite recrystallization fraction of steel with Nb content of 0.08% deformed at high temperature processing was studied,and the deformed austenite recrystallization figures of the test steel were obtained.The result indicates that when the reduction is 60%,the critical temperature of complete recrystallization is 1070 ℃ and the borderline temperature of non-recrystallization is 900 ℃.In contrast with general HSLA steel,the recrystallization and non-recrystallization temperatures are respectively 120 ℃ and 100 ℃ higher than those of ordinary HSLA,so the steel with high content of Nb has better hot processing performance because Nb has great function of holding back recrystallization.     

Effect of Thermomechanical Control Processing on Microstructure and Mechanical Properties of Fe-0.2C-1.44Si-1.32Mn Hot Rolled TRIP Steel

The effect of thermomechanical control processing(TMCP)on microstructure and mechanical properties of Fe-0.2C-1.44Si-1.32Mn hot rolled TRIP steel was investigated through experiments.Strain-induced transformation and transformation-induced plasticity behavior of retained austenite were analyzed.The results show that with multipass deformation,reduction per pass of more than critical deformation in austenite recrystallization region and total reduction of more than 58% in non-recrystallization region and high temperature section of two-phase region,austenite can be refined before γ→α transformation.It is beneficial to obtain refined ferrite grain in final microstructure.To obtain fine and uniform microstructure and excellent strength-ductility balance,a three-stage cooling process(laminar cooling-air cooling-ultra-fast cooling)after hot rolling was conducted.The ultimate tensile strength and elongation of the investigated steel can reach 663 MPa and 41%,respectively.     

低碳钢热连轧过程中工艺参数及组织演变的预测

采用二维有限元法对热连轧生产过程中沿带钢厚度方向的温度场分布进行了预测，建立了描述低碳钢软化行为的再结晶模型，并利用此模型对奥氏体再结晶动力学及微观组织演变进行了模拟计算，建立了计算精轧过程应力-应变曲线的流变应力模型，根据现场数据，对400MPa级超级钢细晶工业轧制实验的轧制力、轧制力矩和轧制功率进行了预测，结果与实测值吻合较好，反映了工业生产实际。     

Anisotropy of subeutectoidal steel in deformation and heating

The structure and properties of thick rolled sheet made from high-strength structural steel of various compositions after controlled rolling are studied. With decrease in the final rolling temperature, the strength increases, as well as the structural banding. The formation of band structure in low-temperature controlled rolling is attributed to machining liquation at temperatures below the recrystallization threshold. This structure may be retained in subsequent heat treatment.