EAF-CSP流程Nb微合金管线钢的开发研究

基于对Nb微合金化技术的系统研究,珠钢利用Nb-Ti复合微合金化技术,运用60mm厚度铸坯在EAF-CSP流程成功地开发了9.50mm厚度X60管线钢.结果表明,通过合理的冶金成分设计和控制连铸工艺、均热及除鳞工艺和控轧控冷工艺,解决了EAF-CSP流程Nb微合金化X60管线钢的组织混晶问题.开发的含Nb X60管线钢组织均匀细小,晶粒度11.5～12.0级,具有优异的强韧性能和良好的焊接性能.     

Nb—Ti微合金化汽车用钢QStE540～403TM的开发研究

基于对珠钢EAF—CSP流程Nb微合金化技术的系统研究，有效地解决了混晶问题，并利用Nb—Ti复合微合金化技术成功地开发了汽车用钢QStE340-460TM。分析结果表明，开发的含Nb—Ti钢带具有优异的韧性、冷成形性能和良好的焊接性能，完全满足汽车、半挂车用钢的要求。     

酒钢CSP流程管线钢X60板卷生产实践

酒钢在CSP流程研制开发的管线钢X60热轧板卷采用纯净钢冶炼、Nb V复合微合金化技术,优质铸坯浇注控制和热机械轧制工艺,开发的产品表面氧化铁皮少,强度高、韧性好、组织合格、焊接性能优良,完全满足用户使用要求。     

EAF—CSP流程X65管线钢开发

介绍了EAF—CSP流程采用单一铌微合金化技术开发的X65管线钢。开发的X65管线钢力学与工艺性能均满足API SPEC 5L标准和用户采购技术条件的要求,同时具有良好的常温、低温韧性和焊接性能。试制钢得到了用户的认可并被广泛应用。     

包钢CSP流程X65管线钢试验研究

在采用Nb、Ti复合微合金化技术研制X60管线钢的基础上,通过采用Nb、V、TI复合微合金化设计和优化轧制工艺,进行了CSP流程X65管线钢试验研究,完成了焊管试验,其综合力学性能达到标准要求。     

J55钢级石油套管用热轧钢带开发及应用研究

介绍了通过EAF—CSP流程采用Nb微合金化技术开发的J55钢级石油套管用热轧钢带。开发的钢带力学与工艺性能均满足API SPEC 5CT标准和用户技术协议，同时具有良好的成型性能和焊接性能。试制钢得到了用户的认可。     

EAF—CSP流程Nb微合金化管线钢的连铸工艺研究

基于珠钢采用Nb微合金化技术成功地开发了管线钢X52和X56的事实，结合CSP薄板坯连铸工艺特点，探索出了一套适合含Nb钢薄板坯连铸的浇注温度制度、结晶器保护渣、连铸拉速和结晶器热流密度匹配及二次冷却曲线等工艺控制技术。     

EAF-CSP流程Nb微合金化管线钢的连铸工艺研究

基于珠钢采用Nb微合金化技术成功地开发了管线钢X52和X56的事实,结合CSP薄板坯连铸工艺特点,探索出了一套适合含Nb钢薄板坯连铸的浇注温度制度、结晶器保护渣、连铸拉速和结晶器热流密度匹配及二次冷却曲线等工艺控制技术.     

钛微合金化X70管线钢动态CCT曲线研究

结合CSP短流程Ti微合金化X70管线钢的开发,用Gleeble-1500热模拟实验机测定了钛微合金化X70管线钢在不同冷却速度下的动态CCT曲线,分析和观察了对应的相变和组织.实验结果表明,钛微合金化X70管线钢控冷工艺对其组织有较大影响.钛微合金化X70管线钢中针状铁素体的比例随热变形后冷却速度的提高而增加,但冷却速度达到10℃/s以后,该比例变化不大.为了得到具有优良综合性能的X70管线钢,即得到以细小均匀的针状铁素体为主的理想组织,应将冷却速度控制在10℃/s左右.     

热轧条件下Nb-Mo及Nb微合金化X100管线钢的组织特征及力学行为

采用实验室热轧、显微分析及力学性能检测手段,对Nb-Mo及Nb微合金化X100管线钢在不同工艺条件下的组织特征及力学行为的变化规律进行了研究.分析结果表明:工艺参数对Nb-Mo复合成分试验钢影响较大,控轧控冷工艺条件下Nb-Mo及Nb微合金化X100管线钢力学性能均能达到API 5L中X100管线钢要求,但Nb-Mo复合成分力学性能富余量较大,性能较优.随冷却速度的增加及终冷温度的降低,试验钢强度增加,韧性及塑性恶化.板条马氏体与贝氏体复相组织较板条马氏体可大大提高试验钢的塑性及低温冲击韧性.     

Mathematical Model of Microstructure Evolution of X60 Line Pipe Steel During CSP Hot Rolling

An integrated process modelling system for simulating the microstructure evolution of Nb-microalloyed HSLA steel produced in CSP hot rolling process has been developed on the basis of the microstructure simulation and mechanical properties prediction technology. 3-D thermomechanical coupled finite element models for simulating hot strip rolling have been developed and the distribution of equivalent plastic strain through the thickness direction of the rolled material by CSP roiling was obtained. Thus the distribution of temperature, strain and strain rate through the thickness of the steel stocks, as well as the microstructure evolution during hot rolling of X60 line pipe steel strip has been investigated by using the developed integrated process modelling system. In addition, the determination and op-timization of controllable process parameters during CSP hot strip rolling for the Nb-microalloyed X60 line pipe steel have been implemented, and control strategies such as adopting larger pass reduction in the first stand, arranging ap-propriate pass interval times and proper rolling speed, to reduce or eliminate mixed grain microstructure of Nb micro-alloyed strip in CSP processing have been proposed.     

控轧控冷工艺在X60钢板试制中的应用

济钢第三炼钢厂新建成且装备先进的中厚板生产线，应用控轧控冷工艺进行了X60钢板的试制。试制结果表明，对于经铌、钒、钛微合金化处理的X60钢板而言，单是控轧工艺难以保证钢板的强度余量；而控轧控冷工艺可使钢板的强度余量大幅度改善，综合性能优异，这与对应的带状组织轻微、晶粒较细小且具有一定体积分数的贝氏体组织有关。     

控轧控冷工艺在X60钢板试制中的应用

济钢第三炼钢厂新建成且装备先进的中厚板生产线，应用控轧控冷工艺进行了X60钢板的试制。试制结果表明，对于经铌、钒、钛微合金化处理的X60钢板而言，单是控轧工艺难以保证钢板的强度余量；而控轧控冷工艺可使钢板的强度余量大幅度改善，综合性能优异，这与对应的带状组织轻微、晶粒较细小且具有一定体积分数的贝氏体组织有关。     

Mathematical Modelling on the Microstructure Evolution of X60 Line Pipe Steel during CSP Hot Rolling

 An integrated process modelling system for simulating the microstructure evolution of Nb-microalloyed HSLA steel produced in CSP hot rolling process has been developed on the basis of the microstructure simulation and mechanical properties prediction technology. Thermo-mechanical coupled finite element models for simulating hot strip rolling have been developed and the distribution of equivalent plastic strain through the thickness direction in the rolled material of CSP rolling was carried out. Thus the distribution of temperature, strain and strain rate through the thickness of the steel stocks, as well as the microstructure evolution during hot rolling of X60 line pipe steel strip have been investigated by using the developed integrated process modelling system. In addition the determination and optimization of controllable process parameters during CSP hot strip rolling for the Nb-microalloyed X60 line pipe steel have been implemented, and control strategies such as adopting larger pass reduction in the first stand, and arranging appropriate pass interval times and proper rolling speed, to reduce or eliminate mixed-grains microstructure of Nb microalloyed strip in CSP processing have been proposed.     

Nb在CSP生产管线钢中的应用

针对薄板坯连铸连轧的工艺特点,根据Nb在钢中的析出规律和作用机理,包钢合理选择微合金化元素Nb及其添加量,并通过严格的冶炼和轧制工艺控制,成功地开发出管线钢等系列产品,对钢中的组织进行了研究,探讨了薄板坯连铸连轧条件下含铌微合金钢的强韧化机理。     

MULPIC冷却装置在品种钢研发中的生产实践

 舞钢新宽厚板生产线MULIPIC在线快冷装备具有高冷却速度等技术特点,结合控制轧制和在线快冷装备对船板、管线钢进行了开发研究,采用直接淬火工艺研究开发了高强工程机械用钢。结果表明： 60 mm厚度E36级TMCP船板钢,组织全部为铁素体＋珠光体,晶粒度10级以上,－40 ℃夏比横向冲击功在183 J以上;X70管线钢的组织为针状铁素体,力学性能合格率达98％;利用直接淬火（DQ）和离线回火工艺,生产出30 mm厚的WQ960D调质钢,屈服强度达到960 MPa,抗拉强度1030 MPa,－20 ℃纵向冲击功在43 J以上。     

Microstructures and Properties of X60 Grade Pipeline Strip Steel in CSP Plant

The microstructures and properties of X60 grade pipeline strip steel were researched.With Nb microalloying and TMCP,the X60 grade pipeline strip steel was developed in the Baotou CSP Plant.The mechanical properties meet the demands on machining and using of pipeline manufacture.The X60 strip steels had been used extensively,which had fine and uniform structures,good performance and excellent toughness.     

大壁厚海底管线钢X70工艺试验

为适应海底油气能源输送的需要,湘钢展开了大量研究,以低碳微合金化配合适当的控轧控冷工艺,成功地试制了大壁厚海底管线X70钢板。