5-9 September 2016
Prague Congress Centre
Europe/Prague timezone

P1.187 Qualification of structural stainless steel products for the ITER correction coil cases

5 Sep 2016, 14:20
1h 40m
Foyer 2A (2nd floor), 3A (3rd floor) (Prague Congress Centre)

Foyer 2A (2nd floor), 3A (3rd floor)

Prague Congress Centre

5. května 65, Prague, Czech Republic
Board: 187
Poster I. Materials Technology P1 Poster session

Speaker

Stefano Sgobba (CERN)

Description

The ITER Correction Coils (CCs) consist of three sets of six coils, Bottom (BCC), Side (SCC) and Top Correction Coils (TCC), respectively, located in between the toroidal (TF) and poloidal field (PF) magnets. The CCs rely on 10 kA NbTi Cable-in-Conduit Conductor (CICC). Each CC winding pack is enclosed inside a 20 mm thick stainless steel case, providing structural reinforcement against the electromagnetic loads arising in the winding pack. BCC and TCC cases are designed with a U-shaped cross-section and a cover, while SCC case consists of two L-shape half cases. The material selected for the coil cases is the austenitic stainless steel 316LN. It shall feature ready weldability both by laser and conventional techniques, high strength and toughness at 4 K. Material production involves not only hot rolled plates of different thicknesses, but also heavy gauge extruded L and rectangular hollow shapes. An adapted steelmaking route including Electroslag Remelting (ESR) combined with a hot transformation step involving redundant multidirectional forging of the slabs and of the billets was necessary to fulfil the stringent material specification and confer cleanliness, fineness of the structure and homogeneity to the final products. An extensive follow-up of the steel manufacturing through systematic non-destructive and destructive examinations was carried out in order to ascertain the soundness and the homogeneity of the final products. Starting from the results of the quality controls performed, the paper highlights the progresses accomplished throughout the steel manufacturing and discusses the properties achieved on the final products that were enabled by the selected manufacturing route. The views and opinions expressed herein do not necessarily reflect those of the ITER Organization

Co-authors

Ignacio Aviles Santillana (CERN, Geneva, Switzerland) Jean-Michel Dalin (CERN, Geneva, Switzerland) Jing Wei (Institute of Plasma Physics, Chinese Academy of Sciences, Hefei, 230031, China) Paul Libeyre (ITER Organization, , Route de Vinon sur Verdon, CS 90 046 - 13067 St. Paul lez Durance cedex, France) Stefanie Agnes Elisabeth Langeslag (CERN, Geneva, Switzerland) Stefano Sgobba (CERN, Geneva, Switzerland) Zhiyong Chai (Taiyuan Iron & Steel (group) Co., Ltd. (TISCO), Taiyuan, 030003, China)

Presentation Materials

There are no materials yet.