HW175mm×175mm型钢孔型设计

以HW175 mm×175 mm热轧H型钢孔型设计为例,介绍在UEU可逆连轧机组上使用X-H轧制法生产HW175 mm×175 mm热轧H型钢,成品轧机孔型设计方法;开坯轧机孔型系统的选择及孔型设计方法;坯料断面的选择;以及使用异形坯生产HW175 mm×175 mm热轧H型钢的孔型设计特点。     

焊管方型化的连续成型工艺开发研制

在圆管直缝焊接成形基础上,应用金属变形协调关系,建立圆管方型化的连续变形生产工艺。开发连续成型的孔型系列,建立圆管方型化的塑性变形数学模型;利用有限元对各道次变形关系进行模拟,优化并确定孔型和成形工艺参数,对带材边缘的应力应变进行失稳分析;开发研制方管连续生产机组。针对方管78 mm×78 mm×3.0 mm进行试生产,获得满意结果。经理论与试验比较分析,其结果具有较好一致性,为生产实践奠定了基础。     

Φ244.48 mm×10.03 mm定径孔型设计和优化

本文介绍了Φ244.48 mm×10.03 mm套管定径孔型设计原理和过程,在使用初始设计孔型参数生产Φ244.48 mm×10.03 mm套管时,钢管内表面有纵向凸起,分析是由于定径机减径率过大造成,通过对定径机孔型参数进行优化,在后续生产中未发现类似缺欠,提高了钢管内表面质量。     

包钢生产热轧无缝方管的工艺设计

文章采用现场试验和数理统计相结合的方法,对包钢利用微张力定径机生产方管的孔型系列规律进行了研究,制定了微张力定径机生产方管的定径工艺参数,经现场轧制140mm×140mm方管实验证明:利用现有的12架微张力定径机组,对方管的定径工艺设计合理可行.     

Φ 10 mm热轧带筋钢筋四线切分轧制技术的开发

为满足国内、外市场对Φ 10 mm热轧带筋钢筋的巨大需求,唐钢公司第二钢轧厂通过孔型设计、导卫选型等完成了Φ 10 mm热轧带筋钢筋四线切分轧制技术的开发。在实际生产中,通过改进轧辊材质、控制轧辊轴向窜动及弹跳、提高轧辊的加工精度等技术措施,解决了轧件出成品架次顶出口、切分架次出口堆钢、轧辊磨损严重等问题,实现了Φ 10 mm热轧带筋钢筋的稳产、高产。     

单机架轧机轧制Ф270mm～Ф300mm热轧圆钢的开发

介绍棒材厂在Ф750 mm单机架轧机上开发Ф270 mm～Ф300 mm热轧圆钢的工艺过程。通过选择设计适合初轧机轧制圆钢的孔型系统及工艺制度,包括孔型系统设计、轧辊孔型加工、加热制度、轧制制度、压下规程,使轧钢设备与工艺相匹配,开发出Ф270 mm～Ф300 mm圆钢,解决了生产过程中存在的难点问题。     

φ20、φ22mm热轧带肋钢筋二切分轧制

张钢棒材生产线在现有工艺设备条件下,通过改变辊径和部分减速比的方法,改变电机转速;重新分配压下量和合理设计孔型系统,实现了φ20、φ22mm热轧带肋钢筋二切分轧制。粗轧机组采用大辊径,精轧机组采用小辊径;预变形孔型K5宽、高由33mm×42mm优化为26mm×30mm;预切分孔型K4切分角由65°缩小为60°。二切分轧制的成功使钢筋的产能提高了1倍。     

攀长特连轧线Ф105mm～Ф110mm孔型设计及应用

为了充分的发挥连轧线生产效率高、成材率高的特点,攀长特公司决定在轧钢厂连轧作业区开发Ф105mm～Ф110mm的规格的生产工艺来生产奥氏体不锈钢(TP-347H、TP-340H)。连轧作业区主要研究在原孔型系统基础上设计Ф105mm～Ф110mm的孔型系统和制定轧制工艺参数,取得成效。     

120mm方坯轧制Φ6.5mm盘条的孔型设计

介绍了新钢公司第三型钢厂设计的一套以 12 0mm方坯经 2 4道次轧制Φ6 5mm热轧盘条的孔型。该设计通过调整轧件断面、增加轧制道次及提高轧机转速 ,提高了Φ6 5mm热轧盘条的成品速度 ,取得了较好的效果。     

120mm方坯轧制Ф6．5mm盘条的孔型设计

介绍了新钢公司第三型钢厂设计的一在套以120mm方坯经24道次轧制Ф6．5mm热轧盘条的孔型。该设计通过调整轧件断面、增加轧制道次及提高轧机转速,提高了Ф6．5mm热轧盘条的成品速度,取得了较好的效果。     

基于CSP工艺热轧及冷轧过程3%Si钢组织和织构的演变

3%Si钢(/%:0.067C、3.09Si、0.34Mn、0.007P、0.003S、0.70Cu、≤0.005Al、0.0080～0.0120N)由50kg真空感应炉冶炼,并在实验室轧机经6道次热轧成3.5mm板,终轧温度850℃,卷取温度650℃,热轧板经常化处理后由4辊可逆轧机6道次冷轧成0.50mm薄板。分析结果表明,热轧板表面主要为随机分布较大的等轴晶,中心处由细小等轴晶和长条状晶粒组成,并出现了很强的旋转立方织构{001}〈110〉。经过冷轧,薄板表面出现了很强的α织构和γ织构组分,并且冷轧板保留了热轧的{001}〈110〉旋转立方织构。     

转炉工艺K55钢级石油套管接箍料的开发

介绍了80t氧气顶底复吹转炉经LF、VD处理后连铸出Ф210mm及Ф270mm圆坯,经Accu—Roll轧机生产Ф194mm×16mm和Ф273mm×20mm接箍料无缝钢管,通过精准的连铸坯成分控制和控轧控冷工艺,使热轧态钢管的性能完全满足了APISPEC5CT规范要求     

34CrMo4热轧无缝钢管矫直碎裂分析

文章介绍了生产34CrM04热轧无缝钢管进行矫直时发生了碎裂,对34CrM04热轧无缝钢管碎裂进行取样检测分析。提出了34CrM04矫直碎裂引起原因为异常的上贝氏体组织,对今后生产34CrM04热轧无缝钢管避免产生异常的上贝氏体组织提出了建设性的建议。     

冷热双混辊压法高炉熔渣破碎试验

围绕高炉熔渣余热回收设计开发了冷热双混辊压法高炉熔渣破碎装置,并以水淬高炉渣作为冷却介质,开展了高炉熔渣辊压破碎试验。试验研究了电机转速R、辊间距离L、冷却介质漏斗高度H等装置运行参数对处理后炉渣的厚度、温度以及玻璃化率的影响,获得最佳参数,为高炉熔渣余热回收及工业试验奠定基础。结果表明,在电机转速为9 r/min、辊间距离为2 mm、水淬渣漏斗高度为4 mm时,处理后的高炉渣呈现为厚度最小为1.26 mm的薄片。此时,炉渣温度为442 ℃,玻璃体化率达89.8%,可在保证高炉渣后续利用的同时,最大程度地提高余热回收温度。     

冷热双混辊压法高炉熔渣破碎试验

围绕高炉熔渣余热回收设计开发了冷热双混辊压法高炉熔渣破碎装置,并以水淬高炉渣作为冷却介质,开展了高炉熔渣辊压破碎试验。试验研究了电机转速R、辊间距离L、冷却介质漏斗高度H等装置运行参数对处理后炉渣的厚度、温度以及玻璃化率的影响,获得最佳参数,为高炉熔渣余热回收及工业试验奠定基础。结果表明,在电机转速为9 r/min、辊间距离为2 mm、水淬渣漏斗高度为4 mm时,处理后的高炉渣呈现为厚度最小为1.26 mm的薄片。此时,炉渣温度为442 ℃,玻璃体化率达89.8%,可在保证高炉渣后续利用的同时,最大程度地提高余热回收温度。     

自动轧管横向壁厚精度研究

摘要：针对自动轧管机轧制薄壁不锈钢管中出现的严重横向壁厚不均问题,借助于三维有限元分析软件Simufact,对X10CrNiTi18不锈钢管典型规格112mm×4.5mm自动轧管过程进行数值模拟。研究了不同轧辊孔型结构参数、芯棒润滑状态、轧辊孔型磨损及穿孔毛管偏心对自动轧管横向壁厚精度的影响。结果表明：随着芯棒摩擦因数的增大,所轧荒管横向壁厚精度明显恶化;偏心毛管轧制所轧荒管依旧偏心,延伸轧制对穿孔毛管偏心壁厚纠偏能力有限;磨损的孔型修模后,采用负芯补轧制较增大芯棒直径轧制所轧荒管横向壁厚不均度增大;采用三段式圆弧孔型,所轧荒管横向平均壁厚更接近目标壁厚,横向壁厚不均度由原孔型的13.55%下降到9.94%,横向壁厚精度明显改善。     

Study on transverse wall thickness accuracy of tube rolled by automatic plug mill

In view of serious uneven transverse wall thickness of thin walled stainless steel tube rolled by automatic plug mill，the automatic tube rolling process of X10CrNiTi18 stainless steel tubes with typical specification of 112mm×4.5mm was numerically simulated by using 3D finite element analysis software Simufact. The influence of different roll pass structure parameters, different mandrel lubrication state, roll pass wear and eccentricity of pierced shell on transverse wall thickness accuracy of automatic rolling tube was analyzed. The results show that as the friction coefficient of the mandrel increases, the accuracy of transverse wall thickness of the rolled tube deteriorates obviously. The hollow tube rolled by eccentric pierced shell is still eccentric, and it shows that the elongation rolling has a limited ability to correct the eccentric wall thickness of the pierced shell. With repaired the worn pass, the unevenness of the transverse wall thickness of the rolled tube increases using the negative mandrel compensation rolling compared with the increase of mandrel diameter. The average transverse wall thickness of the rolled tube is closer to the target wall thickness by using three section arc groove, and the transverse wall thickness unevenness decreases from 13.55% of the original groove to 9.94%, and the transverse wall thickness accuracy is obviously improved.     

张力减径钢管质量缺陷及预防

张力减径是热轧无缝钢管生产中不可缺少的一道轧制工序,钢管在经过减径机后容易出现一些质量缺陷.文章详细介绍了钢管在张力减径后容易产生质量缺陷及其形成原因和预防.     

Rolling of metal balls

The rolling of balls (diameter 93 and 125 mm) of precise mass in helical grooves is simulated by means of QForm-3D and DEFORM-3D software. A model of a virtual rolling mill is created. Analysis of the stress state at characteristic points along the rolling axis focuses on the effective stress, the components of the stress tensor, and the mean normal stress. The mass of balls rolled on new and worn rollers is measured. The quality of internal metal layers is verified, and the hardness of rolled balls over the vertical and horizontal symmetry axes is measured. Modeling of ball rolling shows that the hot blank (a rod of hot-rolled steel) is satisfactorily captured by the rollers. Rolling is stable, without slipping. The blank completely fills the grooves; no gaps are observed between the metal and the walls. The crosslinks between the balls are completely eliminated within the rollers. The crosslinks are cut by the rim of the rollers and pressed into the body of the ball. The individual balls continue to roll along the finishing section of the groove; the stubs of the crosslinks are smoothed; and a completely shaped ball with a smooth surface emerges from the rollers. In modeling the stress–strain state, all the components of the stress tensor are negative. In other words, all the components of the stress tensor are compressive in rolling of the balls. Statistical analysis of the data from weighing of the rolled balls (diameter 93 and 125 mm) shows that the mass deviates from the required value by no more than 1%. Measurement of the hardness over the diametric cross section of the balls shows that there is no decline in hardness in the internal layers. That indicates high quality of the ball core.