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Titre du document / Document title

Neue Werkstoffentwicklungen für moderne Hochleistungskraftwerke = New material developments for modern high-capacity power plants

Auteur(s) / Author(s)

BENDICK W. (1) ; HAHN B. (2) ; VANDENBERGHE B. (3) ;

Affiliation(s) du ou des auteurs / Author(s) Affiliation(s)

(1) Salzgitter Mannesmann Forschung GmbH, Duisburg, ALLEMAGNE
(2) Vallourec & Mannesmann Deutschland GmbH, Düsseldorf, ALLEMAGNE
(3) Vallourec & Mannesmann France, Saint-Saulve, FRANCE

Résumé / Abstract

The first industrial use of X10CrMoVNb9-1 (T/P91) with the implicit possibilities to increase plant efficiency has started an active phase of developing new steels for tube and pipe. The modification of T/P91 - basically by addition of tungsten - has led to the steel grades T/P 92 and X 11 CrMoWVNb 9-1-1 (E911) allowing to increase the steam temperature up to 625 °C. However, the limited oxidation resistance of 9 % Cr-steels prevents to make an optimum use of the creep strength potential that these steels exhibit at 650 °C. The paper reports on the development of a new 12% Cr-steel called VM12 which combines the good creep properties of E911 and T/P92 with a sufficiently high oxidation resistance. Starting with a first phase, material optimization was performed on the basis of 7 lab heats. The resulting steel VM12 is characterized by 0.12% C, 11.5% Cr, 0.3% Mo, 1.5% W, 1.5% Co and additions of Si, V, Nb and B. At the current status of development tubes and pipes are available from two industrial heats. Creep testing has reached a duration of 15,000 h. Furthermore fabrication trials (welding, bending) have started. An increase of steam temperature to 625 °C already demands the use of new steels in the area of membrane waterwall panels. Based on 10 CrMo9- 10 (T/P22) the new steel grades T/P 23 and 7 CrMoVTiB10-10 (T/P24) were developed for this application. The main properties of these new Steels are presented. They have already been standardized in ASTM and 7 CrMoVTiB10-10 is also included in a VdTÜV data sheet. While the use of these steel grades inside the boiler is a technical necessity for live steam temperatures above 585 °C, a good application potential is also given in the domain of thick wall steam line components, which is due to their high creep rupture strengths. This aspect especially applies to the temperature range between 500 and 550 °C for the construction of new plants as well as for refurbishment measures. Examples are given which show that in case of refurbishment reductions.

Revue / Journal Title

VGB powertech    ISSN  1435-3199 

Source / Source

2004, vol. 84, no7, pp. 82-88 [7 page(s) (article)] (8 ref.)

Langue / Language

Allemand

Editeur / Publisher

VGB PowerTech, Essen, ALLEMAGNE  (2001) (Revue)

Mots-clés anglais / English Keywords

Optimization

;

Strength

;

Creep strength

;

Creep

;

Oxidation

;

Water vapor

;

Tungsten

;

Pipe

;

Tube

;

Steel

;

Electric power plant

;

Mots-clés français / French Keywords

Optimisation

;

Résistance mécanique

;

Résistance fluage

;

Fluage

;

Oxydation

;

Vapeur eau

;

Tungstène

;

Canalisation

;

Tube

;

Acier

;

Centrale électrique

;

Mots-clés espagnols / Spanish Keywords

Optimización

;

Resistencia mecánica

;

Resistencia a la fluencia

;

Fluencia

;

Oxidación

;

Vapor agua

;

Wolframio

;

Canalización

;

Tubo

;

Acero

;

Central eléctrica

;

Localisation / Location

INIST-CNRS, Cote INIST : 7739 A, 35400011053874.0110

Nº notice refdoc (ud4) : 15973804



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