COMPOSITION OF STAINLESS STEELS TESTED Chemical Analysis (% weight)PRENW CrNiMoCuWN(1) 0,0525 0,1734 0,2541 0,28 0,2043 0,50,4856 0,0738 17,2 22 25 24,9.

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Presentation transcript:

COMPOSITION OF STAINLESS STEELS TESTED Chemical Analysis (% weight)PRENW CrNiMoCuWN(1) 0,0525 0,1734 0,2541 0,28 0,2043 0,50,4856 0, , ,9 19,9 24,5 26,7 24,5 2,6 3,2 3,6 3,8 6,0 7,3 3,4 4,7 1,5 0,7 0,4 0,9 1,50, L Trade Name UR52N+ SAF SMO 654SMO SAN 28 URB66 URB ,6 5,5 6,3 6,9 17,8 21,8 30, ,76,30,80,1943 UNS SAF2205 AISI PRENW : Cr Mo +1.6 W + 16 N 2

PITTING CORROSION RESISTANCE NaCl 30 g/l - ASTM G61 URB66 316L N Temperature, °C Pitting Potential, mV/SCE N L UR45N S L

LONG TERM IMMERSION TESTING in NATURAL SEA WATER (Crevice Corrosion)

REST POTENTIAL OF MCW SAMPLES in MEDITERRANEAN SEA Crevice Corrosion 32550, 08926, URB66 :No Crevice Cor Rest Potential, mV/Ag-AgCl Time, Days MCW : multi crevice washers

EFFECT OF CLIMATIC CONDITIONS PRENW > 40 :UR52N+, URB26, URB66 (MCW samples): no Crevice Corrosion Rest Potential, mV/Ag-AgCl Time, days Mediterranean Sea, F North Sea, N Atlantic Sea, F 316L Crevice PREN > 40 no corrosion

CREVICE CORROSION in NATURAL SEA WATER Steel GCBKT ItalyFranceFranceSwedenNorway 316L5/55/50/40/44/ / /50/ /4+0/ /50/50/ /50/5+0/ / /50/50/5+0/5 +/++ one/several depassivated area, no weight loss 5/5 crevice corrosion on 5 coupons out of 5 Winter + Summer immersion tests, 3000 hours each

MATERIAL SELECTION FOR SEAWATER SERVICE Free Cl2 (ppm) T(°C) TITANIUM UR B66 S31266 UR B66 - S31266 URB26/08926 UR 52N +/ S Stagnant Flange with Washer (1) > 1 m/s Threaded Joint (2) No fitting nor Crevice geometryCrevice Geometry If some fretting or wear is involved, the material selection has to be adapted (please, contact corrosion specialists) UR B26/N08926 or UR 52N +/ S32520 UR 45N - S31803 S L or UR 45N UR B26/N08926 or UR 52N +/ S Water velocity (1) (2)