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Summary of observations and recommendations concerning 316LN CC case parent material

CC sub-IPT Meeting CC PA 1.1.P3C.CN.01 Cadarache , 14-16 January 2014. Summary of observations and recommendations concerning 316LN CC case parent material. S. Sgobba EN-MME-MM CERN. Selected results on CC parent metal assessed by CERN. (I) Results of NDE

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Summary of observations and recommendations concerning 316LN CC case parent material

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  1. CC sub-IPT Meeting CC PA 1.1.P3C.CN.01 Cadarache, 14-16 January 2014 Summary of observations and recommendations concerning 316LN CC case parent material S. Sgobba EN-MME-MM CERN

  2. Selectedresults on CC parent metalassessed by CERN (I) Results of NDE - on 316LN plates produced by TISCO - on 316LN extruded products provided by TISCO • Examinations on parent metal deliveries of Nov. 2011 issued from hot rolled plates and from extrusions • First results on L and square shape extrusion samples of the most recent (fine grained) production, delivered at CERN Jan. 2014 (IV) Conclusions 2

  3. Method proposed by CERN and agreed : Combination of EN 10307 with the condition of a full examination of the whole products, i.e. inspecting 100 % of the volume and not according to a grid. and EN 4050-4 for the acceptance criteria, class 4 with a restriction on the max. length of the accceptable single discontinuity linear to fulfill original PA requirements concerning discontinuity area EN 4050-4 (I) Results of NDE on 316LN plates produced by TISCO

  4. (I) Results of NDE on 316LN plates produced by TISCO

  5. EDMS 1274542, 2013-03-08 5 (I) Results of NDE on 316LN plates produced by TISCO

  6. 6 (I) Results of NDE on 316LN plates produced by TISCO

  7. 7 (I) Results of NDE on 316LN plates produced by TISCO

  8. Discussion, plates • A combination of the testing method of EN 10307 (100 %) and acceptance criteria based on prEN 4050-4 compliant with PA requirements perfectly adapted • 3 plates acceptable, 2 showing several indications • An investigation of the origin of the indications is suggested • This method was applied with success also to the sample delivered to CERN in the frame of the gravity supports • Unfortunately the two plates with indications were no longer available for further destructive inspections 8 (I) Results of NDE on 316LN plates produced by TISCO

  9. EDMS 1275048, 2013-03-12 9 (I) Results of NDE on 316LN extrusions produced by TISCO

  10. 10 (I) Results of NDE on 316LN extrusions produced by TISCO

  11. (I) Results of NDE on 316LN extruded products provided by TISCO 12

  12. Discussion, extrusions • A combination of the testing method of EN 10307 (100 %) and acceptance criteria based on prEN 4050-4 compliant with PA requirements perfectly adapted • All shapes conform to prEN 4050-4 class 4 (with single linear discontinuity of 6 mm maximum allowed length), no indications have been found • It is strongly suggested that the shapes are premachined before the control, including the internal surface for square hollow shapes (I) Results of NDE on 316LN extruded products provided by TISCO

  13. List from 15/06/2011, R&D phase (II) Examinations on parent metal deliveries of Nov. 2011 issued from plates and from extrusions 14

  14. Visit of IO – ASIPP – CNDA delegationat CERN, Dec. 8, 2011 Progress report on service contract:316LN sample plates and weld samples shipped from TISCO for R&D Dawid J. Marcinek supervisor: Stefano Sgobba EN-MME-MM CERN EDMS 1175462, 2011-12-06 (II) Examinations on parent metal deliveries of Nov. 2011 issued from plates and from extrusions 15

  15. Present report concerns: 316LN sample plates (extruded and hot rolled)and TIG weld sample. 0 (II) Examinations on parent metal deliveries of Nov. 2011 issued from plates and from extrusions 16

  16. Base Materials (BM), NDT results Ultrasonic testing: BM_EX_A5_1 and BM_HR_A6_1 (II) Examinations on parent metal deliveries of Nov. 2011 issued from plates and from extrusions

  17. Base Materials (BM), Metrology results BM_EX_A5_1 and BM_HR_A6_1

  18. Base Materials (BM), • MetallurgicalQualification (MQ) • - Investigated material: 316LN base material • Micro-optical observations:Quantimet 600 • - Ferrite content:Murakami etching, ASTM E407, N° 98 • Grain size: Oxalic acid etching, ASTM E407, N° 13 • Hardness tests:Wolpert, HB2.5/62.5 test, ASTM E10 (II) Examinations on parent metal deliveries of Nov. 2011 issued from plates and from extrusions 19

  19. Base Materials (BM), MQ results Inclusion content: Inclusion content measurement according to ASTM E45: Optical observations on as polished sections, original magnification 100x grain direction 20 BM_EX_A5_long BM_HR_A6_long

  20. Base Materials (BM), MQ results Ferrite content Optical observations after Murakami etching (ASTM E407, N° 98) did not reveal any ferrite, original magnification 500x BM_EX_A5_long BM_HR_A6_long BM_EX_A5_short BM_HR_A6_short (II) Examinations on parent metal deliveries of Nov. 2011 issued from plates and from extrusions

  21. Base Materials (BM), MQ results Grain size Grain size mesurement (ASTM E112) after electrolytic etching (ASTM E407, N° 13; 10 % oxalic acid under 1 A/cm2 for 90 s) showed following results, original magnification 100x G ≈ 3 ÷ 3.5 G ≈ 5 ÷ 6 G ≈ 3.5 ÷ 4 G ≈ 5 ÷ 6 BM_EX_A5_long BM_HR_A6_long BM_EX_A5_short BM_HR_A6_short 22

  22. Base Materials (BM), MQ results Hardness tests Brinell hardness measurements Results show hardness values between 134 HB and 135 HB for extruded sample (as a reference, 316LN CS jackets show approx. 145 HB) and 142 HB to 145 HB for hot rolled plate (II) Examinations on parent metal deliveries of Nov. 2011 issued from plates and from extrusions

  23. CEME report n° 060741-9, 2012-05-11 (II) Examinations on parent metal deliveries of Nov. 2011 issued from plates and from extrusions

  24. (II) Examinations on parent metal deliveries of Nov. 2011 issued from plates and from extrusions

  25. (II) Examinations on parent metal deliveries of Nov. 2011 issued from plates and from extrusions

  26. (II) Examinations on parent metal deliveries of Nov. 2011 issued from plates and from extrusions

  27. (II) Examinations on parent metal deliveries of Nov. 2011 issued from plates and from extrusions 28

  28. Received at CERN, 08 Jan. 2014  (III) First results on L and square shape extrusion samples of the most recent (fine grained) production, delivered at CERN Jan. 2014 29

  29. Results of UT inspection from J.M. Dalin (Cofrend level 3): "I made the UT on L shape and square shape for ITER yesterday (09/10/2014). I did not find discontinuity inside the volume of the material (resolution: FBH 1.2 mm on 35 mm thickness), the sound goes easily across the material and the background noise is very low, the back wall echo is very clean."  Acceptable to EN 4050-4 class 4 including the restriction on the max. length of the accceptable single discontinuity linear • Following inspections willinclude as per previous extrusions: • VT, PT • Metallography (macro/micro), grain size, delta ferrite, inclusion content ASTM E45 method D... 2 times: in the corner regions and in a standard position in the rest of the shapes. • For all except inclusion and ferrite longitudinal (extrusion direction) and transverse viewswillbeobtained • Hardness (HB) in two positions as above • Tensile tests at RT, 4.2 K and fracture mechanics test at 7 K (III) First results on L and square shape extrusion samples of the most recent (fine grained) production, delivered at CERN Jan. 2014 30

  30. Discussion and conclusions • To the extent of the provided and controlledmaterial: • - method for UT assessed and agreed • - someproducts (plates) showed indications as a result of CERN UT examinations • - hardness as expected • grain size finer for plates • fracture mechanicspropertiesfavourable • relation of JIC to yieldstrength at cryogenic T as expected • fracture toughnessvery high • inhomogeneities in the parent metal of HR plates resulted in issues withbeamwelding discussed in the nextpresentationconcerningweldtesting • inhomogeneitiesobserved as well in the 90 mm 316L plate used in the explosion cladbimetal for the feeders (inspection on a dedicatedsample of parent metalthat CERN added to the proposed check of the homogeneity of composition decided on 31/10/2013) • itissuggested to investigate on a dedicated parent metalsample possible segregations in the SS parent metal of the CC clad plate 31

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