Flat rolled and hot-formed parts of high-strength steels for heavy pressure vessels

Conference · Mon Jan 01 04:00:00 EST 1973

OSTI ID:4426438

Neuhaus, W

From 2nd international congress for pressure vessel and piping technology; San Antonio, Texas, USA (1 Oct 1973). See CONF731003-P2. It is pointed out that pressure vessel size increased steadily during the last 20 years in West Germany. At the same time, the use of high-strength steels permitted reductions in wall thickness. Several examples of such vessels are shown. Steel makers contributed to this development by producing steels with improved homogeneity and by reducing the anisotropy of heavy plates in the through thickness direction. Better structural homogeneity can be achieved in heat- treated steels, if sufficient alloy content is used to allow low-temperature transformation even in the center of heawy plates. In recent years German pressure vessel fabricators have preferred high-strength steels with precipitation hardening elements to quenched and tempered materials, widely used in America. High-strength steels require proper working conditions, thorough inspection during welding, and post weld heat treatment. It is shown that stress- relief annealing may affect the steel properties, if temperature and time are not adequate to the material. Some remarks are made concerning safety factors, cyclic loading, corrosive influences and regulations for fabricating of pressure vessels that have been proved useful in West Germany. (auth)

• Research Organization: Thyssen Niederrhein AG, Bonn
• NSA Number: NSA-29-000258
• OSTI ID: 4426438
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

*PRESSURE VESSELS-- FABRICATION
*STEELS-- MECHANICAL PROPERTIES
GERMAN FEDERAL REPUBLIC
HEAT TREATMENTS
METALLURGY
N42200* --Engineering--Facilities & Equipment
N79200 -- Reactors--Reactor Components & Accessories
PLATES
STRESSES
THICKNESS
WELDED JOINTS