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Nitrided steel with increased reliability for steam turbine blades of low pressure cylinders; Vysokoazotistaya stal` s povishennoj nadezhdnostni dlya lopatok ha tsilindrov niskogo davleniya parnikh turbin

Abstract

A new type of steel has been developed, containing 0.11-0.20% N and less than 0.05% C, the sum of both components being within the range 0.16-0.26%. The metal has an austenite-martensite structure with 10-30% austenite content. Samples obtained by counter-pressure casting have been investigated with respect to the influence of the thermal treatment on mechanical properties. The best properties are obtained when applying hardening by heating at 1050{sup o} C and cooling at 550{sup o} C: fluidity limit R{sub 0}.2>=850 MPa, relative elongation A>=15%, relative shortening Z>=50%, impact viscosity KCU >= 588 kJ/m{sup 2} at critical temperature of brittleness <-40{sup o} C. These properties are combined with high corrosion and wear resistance and make the steel suitable for steam turbine blades. 5 refs., 2 figs., 4 tabs.
Authors:
Andreev, Ch; Lengarski, P [1] 
  1. Bylgarska Akademiya na Naukite, Sofia (Bulgaria). Inst. po Metaloznanie i Tekhnologiya na Metalite
Publication Date:
Dec 31, 1995
Product Type:
Conference
Report Number:
INIS-BG-0013; CONF-9410364-
Reference Number:
SCA: 360103; 360101; 360105; PA: AIX-28:033223; EDB-97:061839; SN: 97001774172
Resource Relation:
Conference: 1. scientific and technical conference on nuclear safety conference dedicated to NPP Kozloduy, Kozloduy (Bulgaria), 25-26 Oct 1994; Other Information: PBD: 1995; Related Information: Is Part Of Proceedings of a scientific-technical conference dedicated to the 20-th anniversary of Kozloduy NPP with international participation; PB: 442 p.
Subject:
36 MATERIALS SCIENCE; CORROSION RESISTANT ALLOYS; NITROGEN ADDITIONS; AUSTENITIC STEELS; CASTING; MARTENSITIC STEELS; MECHANICAL PROPERTIES; QUENCH HARDENING; TURBINE BLADES
OSTI ID:
462934
Country of Origin:
Bulgaria
Language:
Russian
Other Identifying Numbers:
Other: ON: DE97621621; TRN: BG9600419033223
Availability:
INIS; OSTI as DE97621621
Submitting Site:
INIS
Size:
pp. 219-222
Announcement Date:

Citation Formats

Andreev, Ch, and Lengarski, P. Nitrided steel with increased reliability for steam turbine blades of low pressure cylinders; Vysokoazotistaya stal` s povishennoj nadezhdnostni dlya lopatok ha tsilindrov niskogo davleniya parnikh turbin. Bulgaria: N. p., 1995. Web.
Andreev, Ch, & Lengarski, P. Nitrided steel with increased reliability for steam turbine blades of low pressure cylinders; Vysokoazotistaya stal` s povishennoj nadezhdnostni dlya lopatok ha tsilindrov niskogo davleniya parnikh turbin. Bulgaria.
Andreev, Ch, and Lengarski, P. 1995. "Nitrided steel with increased reliability for steam turbine blades of low pressure cylinders; Vysokoazotistaya stal` s povishennoj nadezhdnostni dlya lopatok ha tsilindrov niskogo davleniya parnikh turbin." Bulgaria.
@misc{etde_462934,
title = {Nitrided steel with increased reliability for steam turbine blades of low pressure cylinders; Vysokoazotistaya stal` s povishennoj nadezhdnostni dlya lopatok ha tsilindrov niskogo davleniya parnikh turbin}
author = {Andreev, Ch, and Lengarski, P}
abstractNote = {A new type of steel has been developed, containing 0.11-0.20% N and less than 0.05% C, the sum of both components being within the range 0.16-0.26%. The metal has an austenite-martensite structure with 10-30% austenite content. Samples obtained by counter-pressure casting have been investigated with respect to the influence of the thermal treatment on mechanical properties. The best properties are obtained when applying hardening by heating at 1050{sup o} C and cooling at 550{sup o} C: fluidity limit R{sub 0}.2>=850 MPa, relative elongation A>=15%, relative shortening Z>=50%, impact viscosity KCU >= 588 kJ/m{sup 2} at critical temperature of brittleness <-40{sup o} C. These properties are combined with high corrosion and wear resistance and make the steel suitable for steam turbine blades. 5 refs., 2 figs., 4 tabs.}
place = {Bulgaria}
year = {1995}
month = {Dec}
}