运用6σ方法提高304不锈钢冷板板型质量

运用六西格玛方法,分析造成304不锈钢冷板板型不稳定的原因,并进行试验设计,针对性地实施改进,改进效果比较理想,达到了提高304不锈钢冷板板型质量的目的。     

6σ方法在高炉炼铁压差分析中的应用

收集某钢铁厂2BF生产数据,结合6σ管理方法,利用Minitab软件对高炉压差以及所选取影响压差波动的操作参数,进行了因果矩阵分析、相关性分析和回归分析,确定了影响高炉压差的主要因素有风量、热风温度、透气性指数和焦比,并验证了这些因素对压差的影响具有显著有效性。在保持原燃料稳定的条件下,采取改进措施,使得压差波动小,炉况稳定,高炉顺行,从而降低了高炉炼铁生产成本。     

运用6σ方法提高热连轧商品材宽度精度

太钢热连轧商品材,其宽度精度存在宽度偏差较大的问题。本文运用六西格玛方法,分析造成热连轧商品材宽度精度不稳定的原因,并进行试验设计,针对性地实施改进,达到了热连轧商品材宽度精度稳定控制的目的。     

304不锈钢冷板表面纵向色差产生机理分析

对304不锈钢冷板表面纵向色差产生机理进行试验研究,得出304不锈钢冷轧板表面纵向色差是因为不锈钢冷板表面微观粗糙度有差异,使其反光性产生差异,在视觉效果上形成"色差".     

浅谈6σ质量管理法

从缺陷评估 ,管理理念 ,实施过程三个方面谈了 6σ质量管理法。论述了应用 6σ质量管理法的基本方法 ,指明了实施 6σ质量管理法的实际意义 ,使读者对 6σ质量管理法有了一些初步认识和简单了解。     

浅谈6σ管理法的应用原则

6σ管理法是通过减少波动,不断创新,使质量缺陷达到或逼近3.4×10-6的质量水平,以实现顾客满意和组织最大收益的系统科学。应用6σ管理法的主要原则有:以顾客为尊;领导作用;基于事实的决策;对过程的关注、管理和提高;主动管理;团队合作精神的培养;学习型组织的建设;对成功的渴望与对失败的容忍。应用中要注意结合实际充分理解其精髓,并系统科学地导入,才能发挥6σ管理法的应有作用。     

304不锈钢变形抗力试验

 利用Gleeble-1500热模拟试验机对304L不锈钢的金属塑性变形抗力进行了试验研究。首先通过单道次压缩实验研究了变形温度、变形速率和变形程度对变形抗力的影响,合理选择变形抗力数学模型并给出待定系数,然后研究了试验的重复性和试样长度对试验结果的影响,最后通过双道次压缩实验研究了道次间的残余应变对变形抗力的影响并建立了在考虑残余应变影响条件下的变形抗力数学模型。该模型可为计算304L不锈钢的轧制力提供理论依据。     

6σ管理在炼钢质量管理中的实践与应用

介绍了6σ管理的特征、DMAIC改进模式，6σ管理在莱钢炼钢厂钢水成分、氧含量等质量控制中的应用及取得的效果。     

刀具用304／440／304不锈钢复合板的热轧和性能

采用φ500 mm和φ50 mm轧机对304(20 mm)/440(3.5 mm)/304(20 ram)不锈钢坯料进行二次复合轧制成2 mm不锈钢复合板.经力学性能试验和组织观察表明,复合板拉伸断裂试样无分层现象,板间晶粒相互穿过界而实现冶金结合,复合板硬度较高,达到刀具的使用要求.     

304不锈钢冷轧卷连续钝化工艺参数的正交试验

用CIE1976L^*a^*b^*色空间中的白度HW^*作为不锈钢冷轧卷钝化后表面质量的评价指标，对304(18-8)奥氏体不锈钢板材的钝化工艺参数(HNO3 10％～20％，HF 0．8％～2．5％、钝化温度40～70℃、钝化时间1．0～3．0min)进行了正交试验和方差分析。试验和分析结果得出，不同炉批304不锈钢冷轧卷材，因成分和工艺差异，使板材最佳钝化工艺参数稍有不同，但从整体来看，304不锈钢卷材钝化的最佳工艺参数为：HNO3 10％～12％，HF 2．0％～2．5％，钝化温度40～50℃，钝化时间2．0～2．5min。     

Fracture Behavior of Cold Sprayed 304 Stainless Steel Coating During Cold Rolling

 The fracture behavior of cold sprayed 304 stainless steel coating in cold rolling process was studied. The 304 stainless steel coatings were deposited on low carbon steel substrate by cold gas dynamic spray (CGDS) and then cold rolled, respectively. The fracture morphology of the coatings was observed and analyzed, and the crack distributions along the longitudinal rolling direction of the coatings were also investigated and discussed. The results showed that the cohesive strength of the cold sprayed 304 stainless steel coating was too low to be cold rolled. Microcracks were formed in the as-sprayed coatings and ran perpendicularly to the rolling direction. The spacing distance between these cracks decreased with the increase of the cold rolling reduction. In addition, it was also found that the initial crack generated at the surface of the coating and propagated from the surface to the interface along the weakly bonded particles. A theoretical analysis was developed for the coating fracture. It gave a critical minimum cohesive bonding strength of the coating for non-breaking in cold rolling process. The crack propagation manner of the cold rolled coatings was also discussed.     

304不锈钢冷轧薄板表面线缺陷的形貌

研究了304不锈钢冷轧薄板表面出现的线缺陷的形貌,采用光学显微镜和扫描电镜观察连铸板坯、热轧板带和冷轧板的微观组织,分析冷轧板上线缺陷的微观形貌.结果表明,冷轧304不锈钢板的线缺陷是一种微观"沟槽",在线缺陷沟槽边缘存在氧化膜,有的氧化膜呈多层台阶式结构,主要是铬和铁的氧化物,某些氧化膜的边缘存在Mg、Ca、Al等元素.     

Elastic Modulus of 304 Stainless Steel Coating by Cold Gas Dynamic Spraying

 304 stainless steel coating was deposited on the IF steel substrate by cold gas dynamic spraying (CGDS), and the elastic modulus of the 304 stainless steel coating was studied. The elastic modulus of cold sprayed 304 stainless steel coating was measured using the three-point bend testing and the compound beam theory, and the other mechanic parameters (such as the equivalent flexural rigidity and the moment of inertia of area) of the coatings were also calculated using this compound beam theory. It is found that the calculated results using the above methods are accurate and reliable. The elastic modulus value of the cold sprayed 304 stainless steel coating is 1179×105 MPa, and it is slightly lower than the 304 stainless steel plate (about 2×105 MPa). It indicates that the elastic modulus of the cold sprayed coatings was quite different from the comparable bulk materials. The main reason is that the pores and other defects are existed in the coatings, and the elastic modulus of the coatings also depends on varies parameters such as the feed stock particle size, porosity, and processing parameters.     

304不锈钢带材电致塑性轧制

 在自行研制的电致塑性轧机上,对304不锈钢带材进行多道次的冷轧和电致塑性轧制,对比研究不同轧制方式下材料的变形抗力、硬度、抗拉强度及伸长率等性能变化,并对微观组织进行系统分析。结果表明,轧制过程中引入适当的高能脉冲电流,能显著降低材料的变形抗力。各道次电轧后的试样强度低于冷轧试样,伸长率则显著提高,变形能力大大改善。同时,电轧可减少或取消材料加工中的退火工序,提升生产效率。这对寻找一条清洁环保、节能高效的生产工艺道路有十分重要的工程意义。     

不锈钢304板坯连铸浸入式水口堵塞问题探讨

对不锈钢304板坯连铸浸入式水口堵塞状况进行了探讨,对水口内壁所形成的明显三层物质及其形成原因进行了分析,并提出了改善水口堵塞的措施。     

304不锈钢连铸坯表面缺陷分析

对304不锈钢连铸坯进行了解剖分析。分析结果表明:在25%的铸坯深振痕或渣坑缺陷试样中观察到了微裂纹或气孔。