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HAVAR® Corrosion

  • Samples from heat 305992 at 0.045” thick in strand annealed condition
  • Evaluation showed strip to be HRB 91, ASTM grain size 6
  • Weld beads placed on annealed strip via EB welding at International Beam Welding Corp.
ENVIRONMENT TEMPERATUR TEST
DURATION
, HR		 SAMPLE CONDITION
CORROSION RATE
MILS/YEAR MILS/YEAR
COMPARATIVE DATA
316L
MILS/YEAR		 C-276 MILS/YEAR
10% H2 SO4 150°F 96 Unwelded
1.01 0.03
   
96 Welded
0.99 0.03
   
boiling 96 Unwelded
9.79 0.25
850 - 2400 20 - 30
96 Welded
10.28 0.26
   
96% H2 SO4 150°F 96 Unwelded
29.91 0.76
   
96 Welded
33.04 0.84
   
boiling 96 Unwelded
273.76 6.96
560 >200
    96 Welded
267.16 6.79
   
86% H3 PO4 150°F 96 Unwelded
1.02 0.03
1000 20
    96 Welded
1.02 0.03
   
10% H3 PO4 boiling 96 Unwelded
2.15 0.05
   
96 Welded
1.60 0.04
   
1% HCl boiling 96 Unwelded
237.79 6.05
0.2 - 2
    96 Welded
248.69 6.32
   
5% HCl 68°F 96 Unwelded
4.42 0.11
   
96 Welded
4.65 0.12
   
50% NaOH boiling 96 Unwelded
7.49 0.19
2 - 4
96 Welded
7.55 0.19
   
65% HNO3 boiling 240 Unwelded
336.30 55
11 450
240 Welded
296.39 55
   

EVALUATION TEMPERATURE, °F TEST DURATION, HR SAMPLE CONDITION CORROSION BEHAVIOR
Pitting in Mixed
Acid-Chloride (1)		 122 24 Unwelded
and Welded		 No Pitting; Uniform
Attack with corrosion
rate of 17 mils/year
FeCl 3 Pitting
by ASTM G-48
Method A 		68 72 Unwelded Resistant to pitting
- - Welded
104 72 Unwelded
- - Welded
140 72 Unwelded
- - Welded
FeCl3 Crevice
Corrosion by
ASTM G-48
Method B 		68 72 Unwelded Severe Crevice Attack
- - Welded
104 72 Unwelded
- - Welded
140 72 Unwelded
- - Welded
Seawater 86 720 Unwelded No Pitting or General Attack
- - Welded No Pitting or General Attack
Seawater Crevice
Corrosion 		86 720 Unwelded Perforation at Crevice Site
- - Welded Perforation at Crevice Site
Sulfide Stress Cracking
by NACE MR0175		 - - 35 HRC max. Acceptable for use in
Sour Environments
Pitting or Crevice
Corrosion of Surgical
Implants by
ASTM F-746 (2)		 98.6 - 600 grit polish
+ passivation		 Critical Crevice Potential
greater than +0.8 V (SCE)


Mixed acid-chloride: 11.5% H2 SO4 + 1.2% HCl + 1% CuCl2 + 1% FeCl3
Electrolyte: 0.9% NaCl in distilled water, pH = 7.0

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HAVAR® Corrosion Strip and Foil Datasheet