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钢铁市场进入微利时代,提高企业竞争优势的出路在于科技创新、优化工艺,实现低成本生产品种钢战略。针对上述问题,邯钢结合炼钢和轧钢技术装备能力,采用了低碳、高铌以及较低的Cu、Ni、Mo成分设计,采用优化的HTP(OHTP)工艺生产出大厚壁、低成本的X80高级别管线钢。检测结果表明,采用OHTP工艺生产的X80管线钢显微组织、力学性能、-15℃落锤性能均符合国家标准和用户的要求。同时,采用OHTP轧制工艺生产的X80管线钢具有优良的低温韧性,完全满足西气东输二线项目对大壁厚X80管线钢热轧钢板的技术要求。 相似文献
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日照钢铁精品基地生产高级别管线钢X80采用铁水预处理、转炉冶炼、LF精炼、RH真空处理、板坯连铸等炼钢工序。通过优化生产工艺,实现了管线钢X80成分的精确控制,有效地降低了钢中夹杂物含量,提升了铸坯质量。 相似文献
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日前,世界上等级最高的X120管线钢卷板在太钢2250热轧生产线试制成功,太钢成为全球首家实现X120管线钢卷板试生产的企业,也是太钢管线钢技术继X80管线钢之后 相似文献
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采用Gleeble-2000热模拟实验机和Formastor-Digital全自动相变仪测定了X52管线钢焊接连续冷却转变曲线,获得了t8/5为3.3—3400s的组织变化规律。利用热模拟技术研究了X52管线钢粗晶热影响区的微观组织和韧性。结果表明,晶粒粗化是X52管线钢粗晶热影响区韧性显著降低的主要原因。 相似文献
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为了稳定生产和提高铸坯质量,济钢5#连铸机应用了结晶器漏钢预报系统,通过对生产过程中结晶器运行参数的处理,检测结晶器内铸流的漏钢趋势并发出报警信号,同时向连铸机L1级系统反馈降低拉速的信号,主要应用预报系统的热流画面与冷点检测、反粘钢和反漏钢等功能。预报系统应用后,降低了粘结漏钢事故的发生率,保证了产品质量,延长了设备寿命,改善了铸机岗位人员的操作条件。 相似文献
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Slag film samples were taken from the mould wall after casting of stainless steel slabs of grade 304, 321, 409L and 430, which represent austenitic, ferritic and titanium stabilized stainless steels. The chemical compositions of the samples were analysed and their phases were identified using a combination of scanning electron microscope (SEM), energy dispersive X‐ray analysis (EDX) and X‐ray diffraction (XRD). Finally the crystallization ratio was determined by SEM. The results show that the chemical compositions of the films during casting differ from the original designed flux composition. Concerning the heat transfer in the mould, the film taken during casting of steel grade 304 showed the highest insulation ability whereas the film taken during casting of steel grade 409L had the lowest insulation ability. The films taken during casting of steel grades 321 and 430 showed average heat insulation abilities. The solidification conditions in the mould during casting of steel grades 304, 321, and 409L matched the solidification requirements of the corresponding steel grades. However, the basicity of the powder for steel grade 430 should be decreased a little in order to improve the lubrication function and counteract sticking tendencies. Perovskite crystals, which usually precipitate at relatively high temperature, were found in the film taken during casting of steel grade 321. This is harmful in view of the safety of the casting process and the surface quality of the slab. 相似文献
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Controlling the formation of longitudinal cracks on hypo-peritectic steel slab surfaces is one of the key challenges in continuous casting worldwide. Based on the production in Chongqing Iron & Steel Co., mould fluxes with high basicity ranging from 1.7 to 1.8 were put forward and the effects of compositions on the basic properties of mould flux were studied in the present paper. After laboratory experiments, a high-basicity mould flux with an increased crystallisation speed to abate the heat-transfer capability in the meniscus area was fully applied in the first steelmaking plant of Chongqing Iron & Steel Co. Using the high-basicity mould flux, for more than 3 million tonnes of slab production, the large longitudinal crack was eliminated and the rate of formation of small longitudinal cracks decreased greatly. During the production process, sticking that impedes the smooth running of continuous casting was infrequent, and the spot check for longitudinal cracks on micro alloy steel surface was simplified in the slab finishing process. Furthermore, since the application effect of mass production is remarkable, the hot charging process is better implemented, and the contract can be accomplished in time. In summary, the problem of longitudinal cracks on hypo-peritectic steel slab surfaces is finally resolved and the high-basicity mould fluxes have become indispensable auxiliary materials during continuous casting of hypo-peritectic steel. 相似文献
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Mould powders play an important role in the stability of the continuous casting process of steel. The main functions of mould slag (i.e. molten powder) are to provide sufficient lubrication and to control the heat transfer between the developing steel shell and the mould. Sufficient lubrication requires an undisturbed melting of mould powders and uniform infiltration of mould slag. Based on the casting practice in IJmuiden, it is found that these demands become even more important for the applied high casting speeds in thin slab casting at 5 to 6 m/min. At Corus RD&T, mould powders were characterised by X‐ray diffraction and subsequent fully quantitative Rietveld analysis. Additionally, the melting of mould powders has been studied in‐situ using high‐temperature X‐ray diffraction, to gain crucial knowledge about melting relations. Slag rims obtained from the thin slab caster mould were characterised using extended microscopic techniques in order to describe the mechanisms of rim formation and growth. Finally, slag films obtained after casting were characterised. As a result, not only the melting process of mould powder, but also the mechanism of formation and growth of slag rims is much better understood. This knowledge will be applied to define the demands on the composition and properties of mould powder for even higher casting speeds. 相似文献
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针对本厂生产以X80管线钢为代表的低合金高强度钢时,连铸坯易产生角部横裂的问题,本文通过射钉试验、红外测温的方法,以试验结果为依据对邯钢900-2150mm板坯连铸机冷却特性进行分析讨论,结合连铸X80生产实践和测量数据,从拉速、铸坯表面温度、比水量等方面讨论了影响X80连铸板坯角部裂纹产生的因素,结合实验结果提出了优化比水量和拉速的具体措施。 相似文献
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奥氏体不锈钢板坯连铸结晶器锥度的优化 总被引:3,自引:0,他引:3
针对奥氏体不锈钢连铸中的质量问题 ,对太钢三炼钢 1260mm× 160mm板坯结晶器的锥度进行了分析。通过不锈钢铸坯在结晶器内收缩的计算和拉坯速度、过热度等工艺参数对铸坯收缩影响的分析 ,得出采用双锥度结晶器比单锥度结晶器更符合铸坯在结晶器内的收缩规律 :液面附近 80~200mm区域采用较大锥度 ,液面下 200~800mm的结晶器下部 ,采用较小锥度 ,并在此基础上设计了曲线锥度结晶器。生产试验表明 ,双锥度设计显著改善了铸坯质量 ,消除了窄面鼓肚和中间凹陷等缺陷 相似文献