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CREEP CRACK GROWTH IN CARBON MANGANESE STEELS AT 300-420 C

Objective



Creep Crack Growth(CCG) is a failure mechanism which is resulting in catastrophic failure in pressure parts in a wide variety of carbon manganese steels made to various national and international specifications and operating in the range 300-420 c.Such failures are both expensive and place at risk the lives of operating personnel. Work on testing of such failures from accross Europe has indicated that the CCG properties of carbon manganese steels depend critically on their minor or residual element content as affected by deoxidation practice(eg free nitrogen) and the cold working to which they have been subjected.These failures are not specified in European or other steel standards at the present time.In addition experience has shown that susceptible-to-failure steels become more vulnerable in older utilities thus necessitating the need for development of methodologies for estimating safe operating life of such utilities.

This proposal plans to test three purpose produced steels of high, medium and low free nitrogen levels for their creep and creep crack growth characteristics.Similar tests are also planned on commercially produced pipe and tube steels.From these tests and tests on pipe and tube components it is to planned :

a) recommend new specifications for European standards for such steels, and
b) develop methodologies for remanent life assessment of in-service components.

Funding Scheme

CSC - Cost-sharing contracts

Coordinator

Babcock Energy Ltd
Address
Technology Centre High Street
PA4 8UW Renfrew
United Kingdom

Participants (8)

ELECTRICIDADE DE PORTUGAL SA
Portugal
Address
Av. Estados Unidos Da America 55
1700 Lisboa
Forschungs- und Materialprüfungsanstalt Baden-Würtemberg
Germany
Address
Pfaffenwaldring 32
70569 Stuttgart
IMPERIAL COLLEGE OF SCIENCE, TECHNOLOGY AND MEDICINE
United Kingdom
Address
Exhibition Road
SW7 2BX London
KRAFTWERK UND ANLAGEN BAU AG
Germany
Address

8060 Dresden
LABEIN
Spain
Address
Cuesta De Olabeaga 16
48013 Bilbao
LASINDUSTRIA SA
Portugal
Address
Rua San Francisco Antonio Da Silva
2780 Oeiras
METSEARCH BV
Netherlands
Address
Reelaan, 11
7522 LR Enschede
SWEDISH INST FOR METALS RESEARCH
Sweden
Address
Drottning Kristinas Vaeg 48
11428 Stockholm