Superclean steel development

Technical Report · Fri Dec 01 04:00:00 EST 1989

OSTI ID:5148989

Richman, R H; McNaughton, W P ^[1]

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1. Daedalus Associates, Inc., Mountain View, CA (USA)

The Electric Power Research Institute has actively encouraged and sponsored a number of research projects to develop a superclean 3.5NiCrMoV steel for low pressure turbine rotors. Such steel is highly resistant to temper embrittlement and will thus facilitate increased efficiency in electricity generation through the use of higher operating temperatures and improvements in design. The objective of this interim report was to integrate the results that have been generated to date worldwide in the pursuit of superclean steel. The report contains detailed findings that enable the interested utility to evaluate how the results affect utility decision making. A companion document has been written to summarize the findings from this technical report. The results indicate that steels with impurity contents typical of the superclean specification can be manufactured for production rotors with properties that equal or exceed those for conventional 3.5NiCrMoV rotors in every detail. Of particular interest are the results that the superclean steels appear to be virtually resistant to temper embrittlement to a temperature of 500 {degrees}C. 109 refs., 51 figs., 9 tabs.

• Research Organization: Electric Power Research Inst., Palo Alto, CA (USA); Daedalus Associates, Inc., Mountain View, CA (USA)
• Sponsoring Organization: EPRI
• OSTI ID: 5148989
• Report Number(s): EPRI-GS-6610
• Country of Publication: United States
• Language: English

Related Subjects

20 FOSSIL-FUELED POWER PLANTS
200104 -- Fossil-Fueled Power Plants-- Components
36 MATERIALS SCIENCE
360101 -- Metals & Alloys-- Preparation & Fabrication
360102 -- Metals & Alloys-- Structure & Phase Studies
360103* -- Metals & Alloys-- Mechanical Properties
360105 -- Metals & Alloys-- Corrosion & Erosion
ALLOYS
AUSTENITIC STEELS
CHEMICAL REACTIONS
CHROMIUM ALLOYS
CHROMIUM-NICKEL STEELS
CORROSION
CREEP
CRYSTAL STRUCTURE
DUCTILITY
EFFICIENCY
ELEMENTS
EMBRITTLEMENT
FATIGUE
GRAIN SIZE
HEAT TREATMENTS
HIGH ALLOY STEELS
IMPACT STRENGTH
IRON ALLOYS
IRON BASE ALLOYS
MACHINERY
MANGANESE
MECHANICAL PROPERTIES
METALS
MICROSTRUCTURE
NICKEL ALLOYS
PROCESSING
RESEARCH PROGRAMS
ROTORS
SIZE
STAINLESS STEELS
STEELS
STRESS CORROSION
SULFUR CONTENT
TENSILE PROPERTIES
TRANSITION ELEMENTS
TURBINES
TURBOMACHINERY
YIELD STRENGTH