Microstructure Evolution of Cold Pilgering Stainless Steel Tubes

Dai, Jia Wei; Li, Wei; Chu, Zhibing

doi:10.1155/2020/3678980

Cited by 3 publications

(2 citation statements)

References 12 publications

(10 reference statements)

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“…The main parameters affecting the deformation are the die rolling rate, the movement of pipe after each step and the geometry of the tools. However, due to the nature of cold pilgering, there are greater stresses generated on the inner wall of the pipe than the outer surfaces during rolling [24] which can cause flattening of the pipe and fissures on the inner surface as indicated by experiments by [16] and other authors. Typically, the grain size resulting from cold drawing and cold pilgering is similar after working, with this variable being primarily dependent upon the subsequent annealing processes [25]…”

Section: Cold Pilgeringmentioning

confidence: 97%

Manufacturing technologies and joining methods of metallic thin-walled pipes for use in high pressure cooling systems

McNair

Shokrani

Carnevale

et al. 2021

Int J Adv Manuf Technol

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Small diameter thin-walled pipes, typically with a diameter less than 20 mm and a ratio of outer diameter to wall thickness is 20 or above, have increasingly become a key value adding factor for a number of industries including medical applications, electronics and chemical industries. In high-energy physics experiments, thin-walled pipes are needed in tracking detector cooling systems where the mass of all components needs to be minimised for physics measurement reasons. The pipework must reliably withstand the cooling fluid operation pressures (of up to 100 bar), but must also be able to be reliably and easily joined within the cooling system. Suitable standard and/or commercial solutions combining the needed low mass and reliable high-pressure operation are poorly available. The following review of literature compares the various techniques that exist for the manufacture and joining of thin-walled pipes, both well-established techniques and novel methods which have potential to increase the use of thin-walled pipes within industrial cooling systems. Gaps in knowledge have been identified, along with further research directions. Operational challenges and key considerations which have to be identified when designing a system which uses thin-walled pipes are also discussed.

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Section: Cold Pilgeringmentioning

confidence: 97%

Manufacturing technologies and joining methods of metallic thin-walled pipes for use in high pressure cooling systems

McNair

Shokrani

Carnevale

et al. 2021

Int J Adv Manuf Technol

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show abstract

“…Scientists from different countries constantly pay attention to the research on cold rolling of seamless pipes. This, first of all, concerns changes in microstructures [8,9] during cold rolling of seamless stainless steel pipes, the ratio of deforma tions on the wall and on the diameter of the pipe (Qfactor) [3], the creation of nanostructures on the inner surface of pipes [10], improved tubesshells of nuclear fuel [11,12], cre ation of new types of microstructures [13], highenergy pro cessing of metals [14]. This is related to the problems of increasing the perfor mance of pipes in various units of responsible purpose.…”

Section: Tablementioning

confidence: 99%

Microstructures and mechanical properties of cold rolled pipes with increased small deformation

Holovchenko,

Grigorenko,

Protsiv

2023

Nauk. visn. nat. hirn. univ.

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Purpose. Experimental study on microstructure, mechanical properties of pipe diversity on a new type of cold rolling pipe, which has the ability to perform different modes of supply and rotation. Methodology. Research method is an experimental one on modern industrial equipment using modern devices. The study was conducted when rolling pipes made of steel 08Cr18Mn10Ti on the CRP 6-20 mills. Rolling route is often 25 × 2.5 mm ® 16 × 1.5 mm, which is often used in production. Rolling was carried out on the CRP 6-20 mills in four modes of feed and rotation: mode 1 – feed is performed before the forward stroke, and rotation before the return stroke of the stand; mode 2 – the feed is performed before the forward stroke, and the rotation before the forward and reverse stroke of the stand; mode 3 – feeding is performed in the front and rear position of the stand and rotation in the rear position of the stand; mode 4 – feed and turn are performed before the forward and reverse of the stand. Findings. Metallographic studies on microstructures showed that for mode 1, the grain size on the outer surface of the pipes is less than on the inner surface. The difference reaches the value of 1–2 points. For mode 4, the opposite is true. The size of the grains on the outer surface of the pipes is larger than on the inner surface. The difference reaches the value of 1–2 points. This can be explained by the fact that in mode 1 most of the compression is performed in the forward stroke rather than in reverse stroke. And in mode 4, these crimps are close in value and smaller than in a forward stroke in mode 2. Originality. New experimental industrial data have been obtained for the first time on the state-of-the-art cold rolling mill for small-diameter pipes made of microstructures of riveted steel 08Cr18Mn10Ti in cross-sectional and longitudinal sections of the pipes on the outer and inner surfaces of the pipes and between them for four possible feeding and turning modes. For the first time, experimental industrial data on the values of strength limit, yield strength and ultimate elongation at four feeding and turning modes have been obtained as well. Practical value. The obtained experimental industrial data from a set of quality parameters of pipes – metal microstructure, mechanical properties, transverse differences in pipe packages allow one to choose modes of supply and rotation in the production of cold-formed pipes to ensure compliance with regulated quality parameters of supply and rotation pipes.

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The influence of preparation of nano-ZrO₂/α-Al₂O₃ gradient coating on the corrosion resistance of 316L stainless steel substrate

Zhang

Wang

et al. 2023

Science and Engineering of Composite Materials

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Generally, 316L stainless steel instrumentation tubes working in a humid environment with a large amount of Cl− all the year round have serious corrosion problems, so the stainless steel substrate should be gradiently coated with nano-ZrO2/α-Al2O3 slurry. In this article, the slender 316L stainless steel tube was first ground by magnetorheological fluid and then coated with the slurry, which can not only increase the contact area between the coating and the substrate but also prevent the generation of new substances that have adversely affected the adhesion of the coating. The properties of the samples were characterized and analyzed; the results showed that the substrate ground by magnetorheological fluid is more favorable for bonding with coating under the grinding conditions that the speed of the tube is 210 rpm, magnetic induction intensity is 40.83 mT, and mass ratio of micron and submicron magnetic particles is 2.3. The coating prepared under the above conditions has uniform thickness, flat surface, and can better inhibit the diffusion of Cr of the substrate to its surface. It can be obtained from corrosion resistance analysis that the coating has the highest self-corrosion potential of −0.016 V and the lowest corrosion current density of 0.491 μA/cm2, which indicate that the coating has the strongest corrosion resistance. According to the composition analysis of the coating, the composition of the corroded coating is similar to that of the coating itself, but accompanied by a small amount of Fe, which indirectly indicates that the coating is relatively compact, the coating is well bonded with the substrate, and the coating can protect the substrate; thus, the service life of 316L stainless steel instrumentation tubes is extended.

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Microstructure Evolution of Cold Pilgering Stainless Steel Tubes

Cited by 3 publications

References 12 publications

Manufacturing technologies and joining methods of metallic thin-walled pipes for use in high pressure cooling systems

Manufacturing technologies and joining methods of metallic thin-walled pipes for use in high pressure cooling systems

Microstructures and mechanical properties of cold rolled pipes with increased small deformation

The influence of preparation of nano-ZrO₂/α-Al₂O₃ gradient coating on the corrosion resistance of 316L stainless steel substrate

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Microstructure Evolution of Cold Pilgering Stainless Steel Tubes

Cited by 3 publications

References 12 publications

Manufacturing technologies and joining methods of metallic thin-walled pipes for use in high pressure cooling systems

Manufacturing technologies and joining methods of metallic thin-walled pipes for use in high pressure cooling systems

Microstructures and mechanical properties of cold rolled pipes with increased small deformation

The influence of preparation of nano-ZrO2/α-Al2O3 gradient coating on the corrosion resistance of 316L stainless steel substrate

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The influence of preparation of nano-ZrO₂/α-Al₂O₃ gradient coating on the corrosion resistance of 316L stainless steel substrate