CORROSION RESISTANCE OF HASTEllOY®AllOYS - Haynes ...

Type
316
Concen- Temperature HASTEllOY~ alloy Staintration,
less
Corrosive Media percent deg. F deg. C 8/8-2 C/C-276 G/G-3 Steel Conditions
Phosphoric Acid 70·100 200-212 93·100 - E - - acid mist (0.04·.35 grains 100% HJP0 4 per "standard cubic foot" or 0.10·
.86 grams 100% HJP0 4 per cubic meter (STP)). Chloride (20·30 ppm) in
city water used in scrubber liquor, extensive aeration
Phosphoric Acid 75 68·212 20·100 - - E G pH below 1,140 ppm AS20J as impurity. Furnace process to produce
phosphoric acid. Moderate aeration; total days - 375, agitation - 590
fpm velocity
Phosphoric Acid 75 100 38 - - E G pH below 1,140 ppm As20J impurity, moderate aeration
Phosphoric Acid 75 185 85 - E - - 30 days approx., 726·793 hrs., agitation - acid velocity 895 ft.lmin.
Phosphoric Acid 75 194 90 - E - - 30 days approx., 726·793 hrs., agitation - acid velocity 895 ft.lmin.
Phosphoric Acid 75 203 95 - G - - 30 days approx., 726·793 hrs., agitation - acid velocity 895 ft.lmin.
Phosphoric Acid 75 212 100 - - B - 30 days approx., 726·793 hrs., agitation - acid velocity 895 ft./min.
Phosphoric Acid 75 212 100 - - G - 164 hours
Phosphoric Acid 75 221 105 - G - - 48 hours
Phosphoric Acid 75 240·260 116·127 U S - - HF, 30 percent Ca (CaS04 plus H20 plus Si02), half in vapors, half
immersed
Phosphoric Acid 82·87 190·215 88·102 E - - - lower oxides of phosphorous present as impurities
Phosphoric Acid 85·95 165·185 74-85 - E - - small amounts of fluorine compounds
Phosphoric Acid 85·95 212·239 100-115 - B - - small quantities of fluorine compounds in mist. Alloy C = 21 mpy
Phosphoric Acid 86 208 98 E - - S immersed 96 hrs.
Phosphoric Acid 87·90 176·230 80·110 G E - E furnace process, 102 days, trace NaCI and HCI, aeration moderate,
agitation none
Phosphoric Acid 87·90 194 90 G E - E furnace process (63 to 65% P20 S ), trace HCI and NaCI, moderate aeration
Phosphoric Acid 93 260 127 U - - -
Phosporic Acid 93.5 375-410 190·210 - U - U vapor above phosphoric acid 93.5% (67% P20sl. wet process, containing
about 4.3% sulfuric acid and 4.4% iron and aluminum oxides. Fluoride is
present below 1.5%, moderate aeration
Phosphoric Acid 98 390-460 199·238 - - G - (71 percent P20 S ) sulfuric acid 4·6 percent, iron and aluminum 2.8·3.0 as
trioxides, fluorine compounds 0.5-1.0 percent
Phosphoric Acid 101 300 149 - - G - solids 1.17 percent, 0.4 percent fluorine
Phosphoric Acid 103 300 149 B - - - Hl0 4 as catalyst in polymerization reaction, 1000 hrs., mol esters/mol
acid = 0.1
Phosphoric Acid 117 140 60 E - - - 85 percent P20 S
Phosphoric Acid 118 485 251 S B - -
Phosphoric Acid - 60·650 16·343 - E - - gases containing HF, SiF 4 , S02, with entrained HJP0 4 , 99% (72% P 2 O S l.
H2S0 4 3.7%, (3.0% SOJ), extensive aeration
Phosphoric Acid - 230 110 - - E E 75·105% by wt., aeration, 126 days
Phosphoric Acid, 75 172 78 - E - - Alloy C = 1 mpy
Commercial 194 90 - E - - Alloy C = 1.4 mpy
208 98 - E - - Alloy C = 1 mpy
221 105 - G - - Alloy C = 4.6 mpy
Phosphoric Acid, - 320 160 S G - - plus acrylic acid and betapropriolactone. Alloy C= 5 mpy at top of ac-
Dehydrated
rylate unit.
Phosphoric Acid Fumes 75 122 50 G - - - some P20 S and H2S
Phosphoric Acid Mist 100 200·212 93·100 G E E - .04·.35 grains/ltJ, 78 days, aeration extensive, agitation 5·12 fps, pit
depth, alloy B = 4 mils, alloy C = 0, alloy G = 0
Phosphoric Acid Mist - 206 97 G E E - 0.04·.35 grains 100% Hl04per "standard cubic foot" or 0.10·.86 grams
100% Hl0 4 per cubic meter (STP)). Chloride (20-30 ppm) in city water
used in scrubber liquor, extensive aeration
Phosphoric Acid Mixtures 39 170·183 77-84 - G - U (28% P20 S ), sulfuric acid 2%, hydrofluosilicic and hydrofluoric acids in
trace amounts; total fluoride equivalent about 1.2% suspended gypsum
30% of suspension weight. Liquid phase, moderate aeration
Phosphoric Acid 22 180·200 82·93 U G - - for removing scale from parts to be bonderized. Alloy C = 2.5 mpy
Pickling Solution
E - less than 2 mpy (0.05 mm/y)
G - 2 mpy (0.05 mm/y) to 10 mpy (0.25 mm/y)
S - Over 10 mpy (0.25 mm/y) to 20 mpy (0.51 mm/y)
B - Over 20 mpy (0.51 mm/y) to 50 mpy (1.27 mm/y)
U - More than 50 mpy (1.27 mm/y) 35