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超纯铁素体不锈钢热轧生产控制方法 总被引:1,自引:0,他引:1
结合宝钢不锈钢事业部生产不锈钢产品经验,说明了超纯铁素体不锈钢在热轧生产过程中存在的主要质量问题,同时从轧制计划编排、关键工艺控制、轧辊材质使用、设备功能状态等多个角度详细阐述了热轧生产的具体控制要求。着重从解决超纯铁素体不锈钢轧制过程中存在的黏结现象着手,对关键工艺控制点提出了合理的控制范围,并将理论分析与大生产实践经验相结合对其控制原理进行了解释和说明。 相似文献
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蒂森克虏伯AST厂采用新单罐150 t VD/VOD,通过EAF-AOD-VOD三步工艺试制了409LI、439M、460LI以及470LI等4个级别不含Ni和Mo的超纯铁素体不锈钢。生产实践表明,采用EAF-AOD-VOD三步工艺比EAF-VOD两步工艺明显减少处理时间,实现了低成本生产超纯铁素体不锈钢的工艺目标,所生产的新一代超纯铁素体不锈钢AST460LI(%:≤0.010C、21.0~21.4Cr、≤0.002S、0.10~0.20Ti)和AST470LI(%:≤0.007C、23.8~24.2Cr、≤0.002S、0.10~0.20Ti)的耐蚀性和耐高温性能均优于标准奥氏体不锈钢304(%:≤0.08C、8.0~11.5Ni、18.0~20.0Cr)和316(%:≤0.08C、10.0~14.0Ni、16.0~18.0Cr、2.0~3.0Mo)。 相似文献
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阐述了超纯铁素体不锈钢的超低碳氮的特点及其熔体降碳去氮困难的原因,利用真空降碳去氮的理论结合这方面的研究成果分析和讨论了影响VOD脱碳脱氮的影响因素,并利用VOD现场冶炼的具体数据进行了这些因素的统计分析,在此基础上提出了提高真空度、加强底吹氩搅拌强度、提高入炉钢液温度、提高人炉碳含量和降低人炉氮含量、增加VOD吹氧脱碳时的供氧量、高真空吹氩纯沸腾工艺、选用无碳、或低碳还原料等工艺技术措施,最后介绍了太钢这几年在VOD冶炼超纯铁素体不锈钢采取上述措施后所取得的效果。 相似文献
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对K-OBM-S转炉冶炼超纯铁素体不锈钢w(N)的变化规律进行分析,找出了K-OBM-S控氮的关键控制点。结果表明,转炉出钢增氮对炉后w(N)的控制影响大,通过控制钢水w(Si)、扩大出钢控内径、加强出钢口维护等措施,可有效减少出钢增氮量,降低炉后w(N)。 相似文献
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针对304(Crl8-Ni8型)奥氏体不锈钢和430(Cr17型)铁素体不锈钢的特性,通过试验和分析Cr、Cu、Nb、Ti等合金元素对铁基合金材料性能的影响,开发出一种高铬铁素体不锈钢-TTS443(/%:O.010C、21Cr、0.40Cu、0.25Nb、0.20Ti、O.012N) 。该钢种的耐蚀性能与304奥氏体不锈钢相当,具有良好的成形性与焊接性能,TTS443铁素体不锈钢是304奥氏体不锈钢理想代替材料。 相似文献
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作为当今世界上最大的不锈钢生产企业,为适应汽车工业对节能及环保要求的提高。太钢充分利用生产不锈钢的独特优势,开发出系列的铁素体不锈钢,广泛应用在汽车排气系统各部件,产品质量得到用户认可,市场份额逐年增加。 相似文献
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Rodrigo Pinto de Siqueira Hugo Ricardo Zschommler Sandim Dierk Raabe 《Metallurgical and Materials Transactions A》2013,44(1):469-478
Particle-stimulated nucleation (PSN) is investigated in Nb-containing ferritic stainless steel. Coarse-grained sheets were cold rolled to 80 pct thickness reduction and annealed from 973 K to 998 K (700 °C to 725 °C) to obtain partially recrystallized microstructures. Electron backscatter diffraction was performed around coarse niobium carbonitride particles (larger than 1 ??m) within coarse grains (~1 mm), with different host orientations in both deformed and annealed states. In the deformed state, the deformation zones around both spherical and rectangular particles were investigated. The local lattice rotations about the transverse direction necessary to accommodate the particle-matrix strain incompatibility were observed in all grains investigated. After annealing, recrystallization occurs preferentially around coarse particles at the initial stages of recrystallization. Based on a total number of 130 grains nucleated via PSN, we observe both, randomly oriented and minor {111}??110?? oriented texture components. The results also reveal that PSN in this material is not associated with a specific host orientation. 相似文献
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M. Labonne A. Graux S. Cazottes F. Danoix F. Cuvilly F. Chassagne M. Perez V. Massardier 《Metallurgical and Materials Transactions A》2017,48(8):3655-3664
The precipitation occurring in a Nb-stabilized ferritic stainless steel, containing initially Nb(C, N) carbonitrides and Fe3Nb3X precipitates, was investigated during aging treatments performed between 923 K and 1163 K (650 °C and 890 °C) by combining different techniques, (thermoelectric power (TEP), scanning/transmission electron microscopy (SEM/TEM), and atom probe tomography (APT)), in order to determine the precipitation kinetics, the nature and morphology of the newly formed precipitates as well as the chemistry of the initial Fe3Nb3X precipitates, where X stands for C or N. The following composition was proposed for these precipitates: (Fe0.81 Cr0.19)3 (Nb0.85 Si0.08 Mo0.07)3 (N0.8 C0.2), highlighting the simultaneous presence of N and C in the precipitates. With regard to the precipitation in the investigated temperature range, two main phenomena, associated with a hardness decrease, were clearly identified: (i) the precipitation of Fe2Nb precipitates from the niobium initially present in solution or coming from the progressive dissolution of the Fe3Nb3X precipitates and (ii) the precipitation of the χ-phase at grain boundaries for longer aging times. From the TEP kinetics, a time–temperature–precipitation diagram has been proposed. 相似文献