CORROSION RESISTANCE OF HASTEllOY®AllOYS - Haynes ...

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-- - COMPARATIVE IMMERSION PITTING AND CREVICE-CORROSION TEMPERATURES IN OXIDIZING NaCI-HCI SOLUTION The chemical composition of the solution used in this test is as follows: 4% NaCI + 0.1 % Fe2(S04h + 0.01 M HCI. This solution contains 24,300 ppm chlorides and is acidic (pH2). In both pitting and crevice-corrosion testing the solution temperature was varied in 5 deg. C increments to determine the lowest temperature at which pitting corrosion initiated (observed by examination at a magnification of 40X of duplicate samples) after a 24-hour exposure period (Pitting Temperature), and the lowest temperature at which crevice-corrosion initiated in a 100 hour exposure period (Crevice-Corrosion Temperature). ~ '. Pitting Crevice-Corrosion Temperature, Temperature, Alloy deg. C deg. F deg. C deg. F HASTELLOY® alloy C-276 150 302 80 176 CABOT® alloy No. 625 101 214 25 77 HASTELLOY alloy G-3 75 167 25 77 HASTELLOY alloy G-30 75 167 25 77 Alloy No. 904L 45 113 20 68 Type 317LM Stainless Steel 35 95 15 59 Type 317L Stainless Steel 25 77 10 50 •~ CABOT alloy No. 825 25 77 ~ -5 ~23 20 Cb-3 alloy 20 68 ~-5 ~ 23 Type 316 Stainless Steel 20 68 ~-5 ~23 COMPARATIVE STRESS-CORROSION CRACKING DATA Time, hrs. to crack Alloy in boiling 42% Magnesium Chloride Type 304 Stainless Steel 1-2 Type 316L Stainless Steel 1-2 20 Cb-3 alloy 22 Alloy 825 46 CABOT® alloy No. 625 HASTELLOY~ alloys G-3/G-30 HASTELLOY alloy C-276 No Cracks-1000 No Cracks-1000 No Cracks-1000 C COMPARATIVE CREVICE-CORROSION TEST DATA IN 10% FERRIC CHLORIDE Average Corrosion Rate, mils (mm) per year* Alloy 77 deg. F 122 deg. F 167 deg. F (25 deg. C) (50 deg. C) (75 deg. C) HASTELLOY® alloy C-276 0.2 «0.01) 0.2 «0.01) 1.4 « 0.04) HASTELLOY alloy C-4 0.3 «0.01) 0.5 «0.02) 20 (0.51) CABOT® alloy No. 625 1.5 (0.04) 124 (3.1) 510 (13) HASTELLOY alloy G 14 (0.36) 85 (2.2) 550 (14) 20 Cb-3 alloy 205 (5.2) 380 (9.7) 700 (17.8) Type 316L Stainless Steel 312 (7.9) 460 (11.7) 780 (19.8) Alloy 825 730 (18.5) 707 (18) 680 (17.3) • Average corrosion rate on duplicate samples even though most corrosion occurred under crevice. Tests were for 100 hours with grooved block. 82 ~. .......llIII
CREVICE-CORROSION DATA IN 10% FERRIC CHLORIDE AT ROO M TEMPERATURE FOR 10 DAYS Number of Maximum Depth Alloy Attacked of Penetration, Crevices* mils mm HASTELLOY® alloy C-276 0 0 0 CABOT® alloy No. 625 11 3 0.08 HASTELLOY alloy G-3 11 13 0.33 HASTELLOY alloy G 16 17 0.43 Type 317LM Stainless Steel 20 12 0.30 Alloy No. 904L 23 19 0.48 Type 317 L Stainless Steel 16 77 2.0 20 Cb-3 aIloy 24 76 1.9 Type 316 Stainless Steel 24 76 1.9 (Perforated) CABOT alIoy No. 825 24 125 3.2 (Perforated) 'j ·Maximum possible number of crevices was 24. MODIFIED WICK TEST DATA* Media --. Alloy t HASTELLOY@ alloy C-276 1000 ppm Sodium Chloride and 500 ppm Ferric Chloride at 190 deg. F (88 deg. C) for 30 days General Corrosion None Average depth of Average depth of Stress- Crevice Attack, Pitting Attack, Corrosion mils (mm)** mils (mm)** Cracking One crevice at weld-2 (0.05) HASTELLOY alloy G None 3 (0.08) 3 (0.08) None Alloy 625 None 3 (0.08) 3 (0.08) None Alloy 825 Slight 8 (0.20) 8 (0.20) None None Type 316L Stainless Steel Heavy 18 (0.46) 18 (0.46) *In this test, a U-bend, stressed specimen is in contact with a wick material which is wetted by the media shown. The media evaporates from the specimen's surface during the test simulating wet/dry areas in a scrubber. In these areas, heavy deposits of scale and salts often are observed which promote localized corrosion. **Maximum crevice and pitting attack occurred at the salt line. None Cracked on both sides LOCALIZED CORROSION RESISTANCE IN PULP AND PAPER INDUSTRY ENVIRONMENTS Ammonia-Base Spent Sulfite Liquor* First Stage Bleach Unit Envlronment* pH = 1.9, CI- - 200 ppm, pH = 1.8, Ch + HCI + H 2 SO 4 , T = 155 deg. F (69 deg. C) T = 95 deg. F (35 deg. C) Alloys Exposure - 246 Days Exposure - 258 Days Smooth Creviced Smooth Crevlced Areas Areas Areas Areas Type 31 6 Stainless Steel Pitting Crevice Attack Pitting Severe Crevice Attack Alloy 825 No Pitting Crevice Attack No Pitting Severe Crevice Attack HASTELLOY® alloy G No Pitting No Attack No Pitting Slight Crevice Attack CABOT ®alloy No. 625 No Pitting No Attack No Pitting Incipient Localized Attack HASTELLOY alloy C-276 No Pitting No Attack No Pitting No Attack i *Actual FieId Test Results, U-Bend Specimens T - Temperature 83 I I~
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OUR NEW NAME Haynes International,
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COMPARATIVE CHEMICAL COMPOSITIONS,
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'A~0~A~~ Alloy / q,~ "'.>~~~Cfj 0.5
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Type 316 Concen- Temperature HASTEL
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Type 316 Concen- Temperature HASTEl
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