New heat-resistant chromium steels for a promising objects of power engineering

Dub, A. V.; Skorobogatykh, V. N.; Shchenkova, I. A.

doi:10.1134/s0040601508070124

Therm. Eng.

2008

DOI: 10.1134/s0040601508070124

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New heat-resistant chromium steels for a promising objects of power engineering

A. V. Dub

V. N. Skorobogatykh

I. A. Shchenkova

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Cited by 12 publications

(3 citation statements)

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“…Such results are attained because of the application of new manufacturable chromium steels having enhanced high temperature strength. These are domestic grade 10Kh9MFB steel and foreign grade X10CrMoVNb9 1, T91, and P91 steels [3][4][5][6]. Grade 10Kh9MFB steel was used for making steam pipelines of the Kharanokhorskaya district power sta tion (DPS) (t = 565°C, p = 14.5MPa) and the South Ural DPS (t = 567°C, p = 12.2 MPa), steam pipelines of hot reheat for the Cherepetskaya DPS (t = 570°C, p = 3.2 MPa), internal water pipelines of the Nizhne vartovskaya DPS (t = 561°C, p = 14 MPa), and pipe lines of in turbine drainages of the Serovskaya DPS (t = 567°C, p = 39 MPa).…”

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confidence: 99%

“…Such results are attained because of the application of new manufacturable chromium steels having enhanced high temperature strength. These are domestic grade 10Kh9MFB steel and foreign grade X10CrMoVNb9 1, T91, and P91 steels [3][4][5][6]. Foreign chromium steels are often used because of a 20 year lag of Russia in the field of making and using chromium heat resistant steel in power machine build ing (operation life of foreign pipe systems made of grade X10CrMoVNb9 1 steel exceeds 100000 h) and because of the wide application of foreign design solutions for making the boiler and steam pipeline equipment designed for the increased parameters of vapor.…”

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confidence: 99%

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Long-term strength and allowable stresses of grade 10Kh9MFB and X10CrMoVNb9-1 (T91/P91) chromium heat-resistant steels

Skorobogatykh

Danyushevskiy²,

Schenkova

et al. 2015

Therm. Eng.

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At present, Russia is building a great number of combined cycle plants (CCPs) with an operating tem perature of 565-580°C, is realizing the modernization and renovation of equipment of traditional coal fired power units with an increase in a temperature to 565°C, and is designing coal fired power units operat ing under supercritical parameters of vapor (t = 600-620°C, p = 25-30 MPa). The efficiency of these plants is 6-7% higher than for the efficiency of power units operating at a vapor temperature of 545°C [1,2]. Such results are attained because of the application of new manufacturable chromium steels having enhanced high temperature strength. These are domestic grade 10Kh9MFB steel and foreign grade X10CrMoVNb9 1, T91, and P91 steels [3][4][5][6]. Grade 10Kh9MFB steel was used for making steam pipelines of the Kharanokhorskaya district power sta tion (DPS) (t = 565°C, p = 14.5MPa) and the South Ural DPS (t = 567°C, p = 12.2 MPa), steam pipelines of hot reheat for the Cherepetskaya DPS (t = 570°C, p = 3.2 MPa), internal water pipelines of the Nizhne vartovskaya DPS (t = 561°C, p = 14 MPa), and pipe lines of in turbine drainages of the Serovskaya DPS (t = 567°C, p = 39 MPa). Grade X10CrMoVNb9 1 (T91, P91) steel was used for making heat recovery steam generators (HRSGs) and pipelines of CCPs of the Novokuybyshevskaya heat and power plant (HPP) no. 1, Adlerskaya HPP, Krasnodarskaya HPP, South Ural DPS 2, Mosenergo HPP 26, etc. Foreign chromium steels are often used because of a 20 year lag of Russia in the field of making and using chromium heat resistant steel in power machine build ing (operation life of foreign pipe systems made of grade X10CrMoVNb9 1 steel exceeds 100000 h) and because of the wide application of foreign design solutions for making the boiler and steam pipeline equipment designed for the increased parameters of vapor. In 2006-2013, the Central Research Institute of Engineering Technology (RPA CNIITMASH), Pol zunov Scientific Production Association for Research and Design of Power Equipment (NPO CKTI), and the All Russia Heat EngineeringResearch Institute (VTI) tested pipes of domestic grade 10Kh9MFB (10Kh9MFB Sh) chromium mar tensitic steel and foreign grade X10CrMoVNb9 1 (T91, P91) steel. The aim of the test was the substan tiation of the possibility for application of these steels Abstract-Currently, grade X10CrMoVNb9 1 (T91, P91) and 10Kh9MFB (10Kh9MFB Sh) chromium steels are widely applied in equipment manufacturing for thermal power plants in Russia and abroad. Com pilation and comparison of tensile, impact, and long term strength tests results accumulated for many years of investigations of foreign grade X10CrMoVNb9 1, T91, P91, and domestic grade 10Kh9MFB (10Kh9MFB Sh) steels is carried out. The property identity of metals investigated is established. High strength and plastic properties of steels, from which pipes and other products are made, for operation under creep conditions are confirmed. Design characteristics of long term strength on the basis of tests with more than one million...

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mentioning

confidence: 99%

“…Such results are attained because of the application of new manufacturable chromium steels having enhanced high temperature strength. These are domestic grade 10Kh9MFB steel and foreign grade X10CrMoVNb9 1, T91, and P91 steels [3][4][5][6]. Foreign chromium steels are often used because of a 20 year lag of Russia in the field of making and using chromium heat resistant steel in power machine build ing (operation life of foreign pipe systems made of grade X10CrMoVNb9 1 steel exceeds 100000 h) and because of the wide application of foreign design solutions for making the boiler and steam pipeline equipment designed for the increased parameters of vapor.…”

mentioning

confidence: 99%

Long-term strength and allowable stresses of grade 10Kh9MFB and X10CrMoVNb9-1 (T91/P91) chromium heat-resistant steels

Skorobogatykh

Danyushevskiy²,

Schenkova

et al. 2015

Therm. Eng.

Self Cite

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“…Eight standard specimens of steel DI-82 were tested for stress-rupture strength and the results were compared with data in [3] and standard tables [4].…”

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Rapid evaluation of metal properties for high-temperature high-chromium turbine and steam line components

Gladshtein

2010

Power Technol Eng

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Metal of a stopper valve made of steel 1Kh11MFBL, a bent pipe of considerable diameter made of steel 1Kh12V2MF (ÉI-756) and a pipe billet of steel 10Kh9MFBSh (DI-82) are used to consider application of a new procedure, according to which by combined analysis of stress-rupture strength data for a small number of cylindrical and notched specimens it is possible to evaluate metal stress-rupture strength and the relative reserve of thickness for possible initial defects in high-temperature components of cylindrical shape.Complexly alloyed high-chromium steels are used currently in order to manufacture the main components of boilers, turbines and steam lines that operate with a steam temperature of 565°C or more. In our country assimilation of these materials had a considerable history that was interrupted for almost twenty years. Now in view of the construction of power generating units with high steam parameters it is necessary to set up again production of steam lines with steels of this class. Therefore it is important to compare their operating reliability, i.e., mechanical properties under creep conditions on the basis of relatively short-term laboratory studies that do not require a considerable number of specimens. It is necessary to develop special rapid methods for this purpose.It is assumed that the most important property on which the high-temperature operating life of a component depends is metal stress-rupture strength. In addition, it is important to know the reserve of wall thickness for the size of initial defects, permitted by the technical conditions on supply, that compensate their probable presence and provide a life not less than the standard period. It is well known that typical initial defects in pipes are sinks due to scale and longitudinal score marks, and in the bodies of cast components they are blow holes, rat tails, large non-metallic inclusions, etc. In view of this the aim of the article is description of the results of using procedures for evaluating the level of metal stressrupture strength and the reserve of wall thickness for possible initial defects in high-temperature components of cylindrical shape from the results of stress-rupture tests for a relatively small number of cylindrical specimens with an annular notch.The test materials were metal of the cast body of a stopper valve for a high-pressure turbine K-300-240 LMZ made of steel 1Kh11MFBL (cutting was done after 140,000 h of operation); metal from a bent branch pipe 219/187 mm in diameter made of steel 1Kh12V2MF (ÉI-756) operated in a steam line of a live steam unit of 300 MW for 170,000 h, and also (due to a lack of metal from a steam line pipe) metal from a pipe billet 105 mm in diameter of steel 10Kh9MFBSh (DI-82) supplied by JSC "NPO TsNIITMASh."The chemical composition of the metal of these components is given in Table 1, and the mechanical properties of their specimens are given in Table 2.With respect to chemical composition the metal of all of the components answered the standards of the corresponding technical speci...

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Study of steel 10Kh9V2MFBR-Sh properties for steam pipes after prolonged thermal aging

Pchelintsev

Rezinskikh

2012

Power Technol Eng

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Changes in structure and properties are studied as a result of prolonged thermomechanical aging for pipe metal of a new high-chromium steel 10Kh9V2MFBR-Sh, intended for pipelines of live steam and a hot steam reheating unit based on supercritical steam parameters, with the aim of determining the level of reduction in proposed material properties during long-term aging, and also choice of a procedure and criteria for evaluating its reliability during prolonged operation.Keywords: supercritical steam parameters unit, high-chromium steels, short-term mechanical properties, stress-rupture strength, metal aging, live steam, hot industrial reheating, steam pipes, operating reliability criteria, residual life.Over the extent of the last three years (2007 -2010) JSC "VTI" together with leading power generation institutes JSC "NPO TsKTI," JSC "NPO TsNIIMASh," and power generation engineering plants JSC Émal'yans, Silovye Mashiny, has carried out a development program for building a pilot project of a power generation unit based on supercritical steam parameters (SCSP) (live steam parameters: t = = 600°C, p = 28 MPa; intermediate reheating steam: t = = 620°C, p = 4 MPa). Within the framework of this program work has been accomplished for calculating the heating scheme, different versions of boiler installation have been considered, and calculations have been performed for the strength of the main standard sizes of steam pipes for live steam and hot reheating steam.Particular attention is devoted to choice of materials for the main power generation unit elements operating at high temperature: cast casing components, turbine rotor, and steam pipes. The main requirements laid down for these materials are provision of a strength level of not less than 100 MPa at 600°C for a life of 200,000 h, high metal resistance to scaling, good technological efficiency, and workability. World experience has shown that 9 -10% chromium steels of the martensitic class correspond to these specifications to a considerable extent.Within Russia in the 1960s there was experience of creating a SCSP power generation unit, i.e., the power generation unit SKR-100 at the Kashir state power station. However, this installation was aimed at considerably more steadystate operating regimes with a rated life of 100,000 h. High-temperature elements of the power generation unit were manufactured from various austenitic steels. Use of these steels in contemporary power generation units is undesirable since their high linear expansion coefficient limits maneuverability properties of the equipment. In new projects more rigid requirements are laid down for life and maneuverability, and also for unification of domestic materials and technical specifications, and existing overseas analogs [1]. In developing domestic steels very favorable experience has been used, obtained in creating an assimilating high-chromium steels.Development of new materials is currently carried out in order to achieve the maximum unification with overseas materials. Among the latest Russian d...

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New heat-resistant chromium steels for a promising objects of power engineering

Cited by 12 publications

References 0 publications

Long-term strength and allowable stresses of grade 10Kh9MFB and X10CrMoVNb9-1 (T91/P91) chromium heat-resistant steels

Long-term strength and allowable stresses of grade 10Kh9MFB and X10CrMoVNb9-1 (T91/P91) chromium heat-resistant steels

Rapid evaluation of metal properties for high-temperature high-chromium turbine and steam line components

Study of steel 10Kh9V2MFBR-Sh properties for steam pipes after prolonged thermal aging

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