SYMPOSIA PAPER Published: 01 January 1986

Manufacturing of Welded Polyblock Turbine Rotors for Pressurized Water Reactor Nuclear Plants; Optimization of the Steel Grade; Effect of Impurities


Le Creusot Heavy Forge has been manufacturing low-pressure (LP) disks and shaft ends for 1300-MW nuclear power plants. These forgings, in weldable 1.8Cr-1Ni-0.8Mo steel, are welded by Alsthom Atlantique.

With the aim of improved quality, homogeneity of mechanical properties, hardenability, and weldability, this metallurgical research has been carried out: 1. Optimization of the steel grade (the effect of silicon, manganese, and molybdenum). 2. The influence of tempering and stress relief treatment parameters. 3. The effect of impurities.

These studies have led the Steel Melting Shop of Creusot-Loire Factory to invest in a high-performance process of steelmaking: the heating ladle refining process. This new process has had spectacular results that have been confirmed by investigations on cut-up industrial forgings.

Author Information

Pisseloup, J
Creusot-Loire Industrie, Le Creusot, France
Poitrault, IS
Le Creusot Heavy Forge, Creusot-Loire Industrie, Le Creusot, France
de Badereau, A
Le Creusot Heavy Forge, Creusot-Loire Industrie, Le Creusot, France
Bocquet, PG
Creusot-Loire Industrie, Le Creusot, France
Price: $25.00
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Developed by Committee: A01
Pages: 87–103
DOI: 10.1520/STP17354S
ISBN-EB: 978-0-8031-4970-0
ISBN-13: 978-0-8031-0465-5