9Ni钢低温储罐药芯焊丝自动立焊工艺研究

分析了9Ni钢低温容器的焊接特点。通过大量的试验,解决了9Ni钢采用药芯焊丝的自动立焊工艺问题。该焊接工艺已成功地应用于大型低温储罐的制造安装。     

9%Ni钢及其在LNG储罐建造中的焊接简

9％Ni钢是含镍量为8．5％～10％Fe—Ni系低碳马氏体型超低温钢,在-196℃具有优异的强韧性,广泛应用于大型液化天然气储罐等低温设备的建造。9％Ni钢通过合理的合金设计、先进的冶炼技术和严格的热处理保证其优异的低温韧性。克服了在大型LNG储罐建造过程中主要出现的孤坑裂纹、横焊打底焊道贯穿裂纹和气孔等焊接缺陷。结合大型LNG储罐工程建设实例,对9％Ni钢及其焊接工艺和焊接工艺评定要点进行归纳分析。     

5万m^3LNG储罐9％Ni钢的焊接质量检验

50000m^3LNG储罐内罐材料为9Ni钢,焊接施工比较复杂,焊接接头的质量要求高,根据9Ni钢低温储罐的焊接接头特点,介绍了9Ni钢焊接质量检验的过程和射线检测采取的有效措施,保证了50000m^3LNG储罐的施工质量,为LNG储罐施工的焊接检验积累了经验。     

9Ni钢材料应用于LNG储罐的制作要领和检测方法

结合工程应用实例,论述了9Ni钢材料在国内液化天然气(LNG)储罐的使用情况.介绍了9Ni钢的理化特性和选材要领;从焊接材料的选择、焊接接头的低温韧性、焊接热裂纹、焊接冷裂纹、电弧的磁偏吹等方面阐述了焊接9Ni钢材料时易出现的问题和改进措施;提出了9Ni钢焊接接头检测方法和相关注意事项.     

低温储罐9Ni钢焊接质量控制

低温储罐如存储LNG、乙烯等介质的储罐,其结构大体相同,均是全包容混凝土外罐加钢制内罐形式。低温储罐内罐的主要材质为9Ni钢,而内罐施工的关键就在于9Ni钢的焊接,其焊接质量在很大程度上决定了整个项目的工期。本文从焊工、焊接材料、焊接工艺、焊接注意事项等主要方面进行分析论述,结果表明,通过严格的质量把控,可有效保证9Ni钢内罐的焊接质量。     

全自动MAG焊在20万m~3LNG储罐抗压环结构焊接中的应用

简要介绍了江苏LNG项目二期工程20万m~3LNG储罐的抗压结构形式和16MnDR压力容器钢板的机械性能,通过选用合理的焊接工艺实现了抗压环结构现场的高效制作,对施工过程中遇到的问题提出解决方案。     

9Ni钢在LNG储罐中的应用分析与探讨

结合LNG储罐建设相关论文及文献,论述9Ni钢材料在国内液化天然气（LNG）储罐的使用情况。介绍9Ni钢的理化特性和选材要领。从焊接材料的选择、焊接接头的低温韧性、焊接热裂纹、焊接冷裂纹、电弧的磁偏吹等方面阐述焊接9Ni钢材料时易出现的问题和改进措施及9Ni钢国内的应用现状。     

大型LNG低温储罐9Ni钢焊接工艺优化及质量管控

本文针对大型LNG低温储罐9Ni钢焊接工艺进行了优化研究,介绍了该焊接工艺的施工步骤并分析了其存在的问题。通过选用合适的焊接工艺、优化焊接工艺参数、严格控制材料质量和建立完善的质量管理制度等措施,提升了大型LNG低温储罐9Ni钢焊接工艺的质量和可靠性。     

30000 m~3单容双壁LNG储罐施工技术

LNG储罐作为LNG的陆上储存设备,属常压、低温大型储罐,通常为平底、双壁圆柱形,主要分为单容罐、双容罐及全容罐。单容式储罐投资相对较低、施工周期短,但容易泄漏,其制作、安装技术显得尤为重要。现以湖北某5×10~6m~3/d LNG工厂国产化示范工程30 000 m~3LNG储罐为例,从储罐的结构、安装、焊接、保冷、水压/气压试验等方面对其施工技术进行阐述。     

16MnDR钢的焊接工艺分析

16MnDR钢的焊接关键是如何保证焊接接头的低温韧性。焊接过程中 ,合理选用焊接材料 ,采取相应的工艺措施 ,通过改善组织 (细化晶粒 ) ,以实现提高性能 (低温韧性 )的目的。     

液化天然气低温储罐用9Ni钢

9Ni钢具有强度高、韧性好的特点,是制造大型液化天然气低温储罐的主要材料之,介绍ASME和GB24510-2009中9Ni钢的化学成分、力学性能;分析9Ni钢在焊接时产生的问题及原因．提出预防和解决的措施;简述9Ni钢目前国内生产现状。     

09MnNiDR甲醇洗涤塔的关键制造技术简

国产09MnNiDR材料是具有自主知识产权的国产低温用钢材,广泛用于石油化工低温设备制造,本文以09MnNiDR醇洗涤塔为例探讨低温压力容器的生产制造,从材料的选用到焊接、组装整个过程进行了详细的介绍。     

Magnetic states of an individual Ni nanotube probed by anisotropic magnetoresistance

Defined magnetization states in magnetic nanotubes could be the basic building blocks for future memory elements. To date, it has been extremely challenging to measure the magnetic states at the single-nanotube level. We investigate the magnetization states of an individual Ni nanotube by measuring the anisotropic magnetoresistance effect at cryogenic temperature. Depending on the magnitude and direction of the magnetic field, we program the nanotube to be in a vortex- or onion-like state near remanence.     

浅析多层绝热低温车的施工工艺

本文分析了多层绝热低温车的施工环境卫生要求，绝热材料的选择及其处理工艺，重点介绍了多层绝热材料的编者绕工艺及对罐体的油真空工艺。     

LNG储罐国产06Ni9低温钢的焊接工艺评定

06Ni9钢是太钢自主研发的用于LNG低温储罐的低碳中合金马氏体型低温钢。通过分析06Ni9钢的焊接性特点,制定了合理的焊接工艺,对06Ni9钢的焊接接头力学性能、低温(-196℃)冲击韧度进行了测试,并对焊接接头进行了宏观金相检验。评定结果表明:采用合理的焊接工艺,国产06Ni9钢的综合性能可以满足LNG工程的要求。     

酸性化学镀Ni-W-P合金镀层工艺研究

酸性化学镀Ni—W—P合金的可能性判定，探索次亚磷酸钠在酸性介质中将WO4^2-还原成W的机理，寻找在施镀条件下使W-O键松驰、断裂的催化剂，实现化学镀Ni—W—P合金镀层的生产应用。     

A novel laser welding process with in-situ fibrous carbon precipitation strengthening interface for C/C composites

To enable online joining and installation of large-sized C/C components with high-temperature resistance requirements, a novel laser welding process utilizing Ni as filler material was proposed for joining C/C composites. The results show that, under inert gas protection, the laser beam melts the Ni filler to form a stable molten pool and heats the C/C substrates. In the localized high-temperature environment, eutectic reaction occurs between the Ni molten pool and the C/C substrates, resulting in partial dissolution of the C/C substrates into the liquid Ni. As the joining proceeds, the Ni molten pool solidifies, and most of the dissolved C precipitates in the weld seam and at the C/C/weld seam interfaces to form fibrous carbon. The fibrous C that precipitates at the interface tends to grow perpendicularly to it, thus strengthening the joining interfaces. The highest average three-point bending strength of the joint was measured to be 59 ± 7 MPa.     

The Characteristic Parameters of Ni/<Emphasis Type="Italic">n</Emphasis>-6H-SiC Devices Over a Wide Measurement Temperature Range

Ni/n-type 6H-SiC/Ni Schottky barrier diodes (SBDs) have been prepared by the DC magnetron sputtering deposition technique. Their current-voltage characteristics (I-V) have been measured in the measurement temperature range of 40-400 K with steps of 20 K under dark conditions. The barrier height (BH) values from the temperature-dependent forward and reverse bias I-V characteristics by different methods coincide with each other which indicates the elimination of the polarity between the Si and C ions. The ideality factor value remains almost unchanged in the 160-400 K range, and below 160 K, it has the values of 1.57 at 140 K, and 3.82 at 60 K. The BH has the values of 0.79 eV at 400 K, and 0.71 eV at 300 K. The decrease in the BH is due to the fact that the current will preferentially flow through the lowest BH with decreasing temperature due to barrier inhomogeneity. The value of 0.71 eV at 300 K is in close agreement with the values of 0.65 and 0.83 eV reported from the forward bias I-V characteristics for the Ni /n-type 6H-SiC in the literature. Thus, it has been concluded that the reduced barrier devices are promising for applications in devices operating at cryogenic temperatures as infrared detectors, sensors in thermal imaging and small signal zero-bias rectifiers and microwave mixers.     

Nanocrystalline multicomponent entropy stabilised transition metal oxides

Multicomponent entropy stabilised oxides containing four and five metal elements in equiatomic amounts were successfully synthesised in nanocrystalline form by nebulised spray pyrolysis (NSP), flame spray pyrolysis (FSP) and reverse co-precipitation (RCP) techniques, demonstrating that entropy stabilisation of these recently discovered materials is independent of the synthesis method. Both 4- and 5-cationic systems, (Co,Mg,Ni,Zn)O and (Co,Cu,Mg,Ni,Zn)O, can be stabilised into a single rocksalt structure directly only using NSP, while in FSP and RCP, stabilisation can be achieved after thermal treatment. This result indicates, that in 5-cationic NSP system configurational entropy is high enough to directly stabilise single rocksalt phase at lower temperature, while higher synthesis temperature is required to compensate the lower configurational entropy in 4-cationic system. Retention of single-phase at room temperature indicates sluggish diffusion kinetics, making entropy stabilised phases quenchable.