Improvement of the technology of producing extended composite transition pieces of steel 20 — steel 08Kh18N10T made by the method of hot screw rolling in vacuum

2017 ◽  
Vol 2017 (12) ◽  
pp. 33-37
Author(s):  
B.V. Borts ◽  
◽  
I.M. Nekhlyudov ◽  
N.D. Rybalchenko ◽  
V.I. Sytin ◽  
...  
Keyword(s):  
Screw Rolling ◽  
Steel 08Kh18n10t ◽  
Steel 20

scholarly journals Improvement of the technology of producing extended composite transition pieces of steel 20 — steel 08Kh18N10T made by the method of hot screw rolling in vacuum

2017 ◽  
Vol 2017 (12) ◽  
pp. 46-51
Author(s):  
B.V. Borts ◽  
◽  
I.M. Nekhlyudov ◽  
N.D. Rybalchenko ◽  
V.I. Sytin ◽  
...  
Keyword(s):  
Screw Rolling ◽  
Steel 08Kh18n10t ◽  
Steel 20

Improved Screw Rolling Press

1884 ◽  
Vol 18 (445supp) ◽  
pp. 7097-7097
Keyword(s):  
Screw Rolling

Study of fine structure of cold-deformed steel 20 before and after prerecrystallization heat treatment

2015 ◽  
Vol 0 (1) ◽  
Author(s):  
Oleksandr M. Dubovyi ◽  
Oleksandr V. Chechel ◽  
Oleksandr O. Zhdanov
Keyword(s):  
Heat Treatment ◽  
Fine Structure ◽  
Before And After ◽  
Steel 20

Prediction of Billet Fracture at Two-High Screw Rolling Piercing

Metallurgist ◽  
2021 ◽  
Vol 64 (9-10) ◽  
pp. 1020-1028
Author(s):  
Yu. V. Gamin ◽  
M. M. Skripalenko ◽  
B. A. Romantsev ◽  
M. V. Kadach
Keyword(s):  
Screw Rolling

Research of the boundary structure for the bimetal compound steel 08Kh18N10T + vanadium VnPl-1 + titanium VT1-0 at the influence of explosion energy

2021 ◽  
pp. 1-4
Author(s):  
V. V. Kurilkin ◽  
I. V. Saykov ◽  
A. Yu. Malakhov ◽  
A. S. Shchukin ◽  
A. A. Berdychenko
Keyword(s):  
Explosion Energy ◽  
Boundary Structure ◽  
Steel 08Kh18n10t

Effects of corrosion-crack geometrical parameters on tip electrochemical processes for steel 20

1993 ◽  
Vol 29 (2) ◽  
pp. 142-145
Author(s):  
I. M. Dmitrakh ◽  
O. A. �zers'ka
Keyword(s):  
Geometrical Parameters ◽  
Electrochemical Processes ◽  
Steel 20

Mechanical properties of steel 20 at small deformations

2015 ◽  
Vol 57 (8) ◽  
pp. 1569-1573 ◽  
Author(s):  
B. G. Mytsyk ◽  
Ya. P. Kost’ ◽  
B. I. Turko ◽  
G. I. Gas’kevich
Keyword(s):  
Mechanical Properties ◽  
Steel 20 ◽  
Small Deformations

scholarly journals Obtaining hollow semi-finished products from copper alloys for electrical applications by screw rolling method

2020 ◽  
pp. 27-38 ◽  
Author(s):  
Yu. V. Gamin ◽  
B. A. Romantsev ◽  
A. N. Pashkov ◽  
P. V. Patrin ◽  
I. A. Bystrov ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Copper Alloys ◽  
Reduction Process ◽  
Point Of View ◽  
Wall Thickening ◽  
Relative Reduction ◽  
Outer Diameter ◽  
Screw Rolling ◽  
Front End ◽  
Rolling Method

The article proposes a process for obtaining semi-finished products in the form of pipes made of copper alloys for electrical applications using the screw rolling method. The paper presents the results of experimental piercing and rolling of pipe samples made of Cu–0.75Cr copper alloy billets with a diameter of 45 mm. The 43.5×10.0 mm samples obtained after piercing using a two-roll screw rolling mill had exact geometrical dimensions: outer diameter deviation at the front end was up to 1 %, at the back end – up to 2.4 %; relative variation in wall thickness at the front end was 0.3÷0.5 %, at the rear end – 0.5÷1.0 %. Then pierced pipe samples were rolled using a three-roll radial-shear rolling (RSR) mini mill with a different total degree of reduction – samples were obtained with an outer diameter of 30, 25 and 18 mm. The reduction process was analyzed from the point of view of internal hole stability and deformation. In case of 30 % relative reduction of the outer diameter, rolling without a mandrel is accompanied by wall thickening. In this case, inner diameter deviations are within acceptable limits. The experiments on obtaining samples from the Cu–0.75Cr alloy by screw piercing and reduction in the RSR mill show that this scheme can be implemented in principle in industry. At the same time it is necessary to define more exactly deformation parameters (degree of deformation, choice of reduction scheme) to obtain a quality product. Various options for heat treatment (HT) of the obtained pipe samples and the effect of the HT method on electrical conductivity and hardness are considered. Samples after piercing had a conductivity of 59.3 % IACS. The maximum electrical conductivity of 76.7 % IACS was obtained on samples after quenching from a temperature of 1020 °C and aging at 450 °C for 3 h. The results of the work show the fundamental possibility of obtaining semi-finished products from copper alloys for electrical purposes using the screw rolling method.

scholarly journals Estimation of Possibilities of Using Fractal Dimension and Information Entropy of Elastic Waves for Assessment of Damage to Steel 20 at Low Cycle Fatigue

2021 ◽  
Vol 24 (3) ◽  
pp. 17-25
Author(s):  
A.A. Khlybov ◽  
Y.G. Kabaldin ◽  
M.S. Anosov ◽  
D.A. Ryabov ◽  
D.A. Shatagin ◽  
...  
Keyword(s):  
Fractal Dimension ◽  
Elastic Wave ◽  
Information Entropy ◽  
Low Cycle Fatigue ◽  
Experimental Studies ◽  
Ultrasonic Signal ◽  
Second Phase ◽  
Cycle Fatigue ◽  
Fatigue Damage Accumulation ◽  
Steel 20

The paper presents the results of experimental studies of specimens made of steel 20 for low-cycle fatigue (cantilever bending). A fatigue curve was obtained for the material under study in the range of stress amplitudes from 210 to 380 MPa. In logarithmic coordinates, this dependence is linear. According to the research results, it has been shown that one of the structure-sensitive characteristics is the shape of an elastic wave pulse transmitted through the medium under study. To analyze the pulse shape of an elastic wave, an algorithm is proposed for assessing the damage of materials, using the values of the fractal dimension of the attractor and the information entropy in the process of fatigue loading. It was found that according to the obtained dependences, the process of fatigue damage accumulation can be conditionally divided into 2 phases. In the first phase, the entropy of the ultrasonic signal practically does not change and remains within the range of 0.05-0.1 nat. The fractal dimension of the attractor of the ultrasonic signal increases from 1.5 to 1.8. During the transition to the second phase, the maximum values of the fractal dimension of the attractor of the ultrasonic signal are observed, the values of which decrease in the second phase to 1.4 before the destruction of the sample. The information entropy values in the second phase increase monotonically up to 0.55 nat. Studies have shown that the obtained dependences practically do not change with a change in the stress amplitude. The results of studies at various stress amplitudes have shown that the characteristics of the fractal dimension of the attractor and the information entropy of elastic wave pulses that have passed through the zones of accumulated damage in the metal expand and supplement the capabilities of acoustic methods in the problems of assessing the performance of materials with low-cycle fatigue and make it possible to identify the stage of destruction of steel 20.

scholarly journals Corrosionfracture kinetics in welded pipes in chlorine-saturated carbon dioxide oilfield media

2021 ◽  
Vol 225 ◽  
pp. 01007
Author(s):  
Anna Fedotova ◽  
Mikhail Vyboischik ◽  
Dmitry Kazdayev ◽  
Sergey Knyazkin ◽  
Tamara Tetyueva
Keyword(s):  
Mechanical Properties ◽  
Carbon Dioxide ◽  
Operating Conditions ◽  
Corrosive Media ◽  
Corrosion Resistant ◽  
Corrosion Rates ◽  
Stavropol Region ◽  
Chlorine Ions ◽  
Steel 20 ◽  
Grade Steel

Bypass tests of Ø219×8mm 13KhFA, 08KhMFChA, 20-ksh (steel 20 corrosion resistant cold resistant) and Grade steel 20 piping spools were carried out on an oil-gathering line of one of the oilfields in the Stavropol region. Tubing condition was checked after 7, 15, 17 and 23 months of testing. After two years in service no change was found in mechanical properties of the base metal or weldments manufactured from 13KhFA and 08KhMFChA steels. It has been demonstrated that the formation of chromium-containing phase in corrosion products inhibits the penetration of chlorine ions from corrosive media to the surface of metal and thus reduces corrosion rates. Estimated, laboratory and comparison passivation coefficients have been proposed. These coefficients make it possible to predict the level of steel self-passivation with regard to operating conditions of particular oilfields.

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