Properties and Workability of New Creep Strength Enhanced Steels as Known Grades 23, 24, 911 and 92

Author:

Bendick Walter1,Gabrel Jean2,Vaillant Jean-Claude3,Vandenberghe Bruno4

Affiliation:

1. Salzgitter Mannesmann Forschung GmbH, Duisburg, Germany

2. Centre de Recherche Vallourec, Aulnoye-Aymeries, France

3. V&M France, Boulogne-Billancourt Cedex, France

4. V&M France, Saint-Saulve, France

Abstract

The improvement of thermal efficiency by increasing the operating temperature and pressure of boilers has recently led to the development of new creep-resistant steels. For 9–12% Cr steels, grade T/P91, developed at the end of the seventies by CE (Combustion Engineering) and ORNL (Oak Ridge National Laboratories) [1] in the USA, marked the starting point for these developments. With its excellent mechanical characteristics at elevated temperatures and good workability, it was rapidly adopted worldwide for erecting new power generators. The tube design temperature is limited to around 610°C (1130°F) inside the combustion chamber. This limit depends on such factors as heat flow and corrosion. Steam lines in P91 are generally operated at temperatures below or slightly above 600°C (1112°F). More recent developments to produce new grades such as T/P911 and T/P92, have improved mechanical properties at high temperatures, in particular an increase in creep strength of 10 to 30% in 100,000 hrs at 600°C (1112°F). This makes it possible to reduce the wall thickness of the pipes and consequently improve their behavior to thermal fatigue. The new grades T/P23 and T/P24 are well suited for boiler components working at lower temperatures. While these grades were initially developed for manufacturing the water wall panels of Ultra Super Critical Boilers (USCB), they are also used for the superheaters and reheaters of conventional boilers and Heat Recovery Steam Generators (HRSG) in combined cycles. In addition to their excellent workability, they have the advantage to be used without post-weld heat treatment in case of thin wall tubes. Furthermore, owing to the good creep properties, they can be used to replace P22 and for some applications even P91, with the advantage of lower costs. This paper sets out the characteristics of these new grades and gives the main recommendations for processing them.

Publisher

ASMEDC

Cited by 1 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

同舟云学术

1.学者识别学者识别

2.学术分析学术分析

3.人才评估人才评估

"同舟云学术"是以全球学者为主线,采集、加工和组织学术论文而形成的新型学术文献查询和分析系统,可以对全球学者进行文献检索和人才价值评估。用户可以通过关注某些学科领域的顶尖人物而持续追踪该领域的学科进展和研究前沿。经过近期的数据扩容,当前同舟云学术共收录了国内外主流学术期刊6万余种,收集的期刊论文及会议论文总量共计约1.5亿篇,并以每天添加12000余篇中外论文的速度递增。我们也可以为用户提供个性化、定制化的学者数据。欢迎来电咨询!咨询电话:010-8811{复制后删除}0370

www.globalauthorid.com

TOP

Copyright © 2019-2024 北京同舟云网络信息技术有限公司
京公网安备11010802033243号  京ICP备18003416号-3