Transcript Aucun titre de diapositive - Super Duplex Alloys

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EROSION CORROSION
BY SOLID PARTICLES
IN SUSPENSION IN AN AQUEOUS
CORROSIVE MEDIA
Jean-Pierre Audouard
Christophe Dernoncourt
Revision : 29 July 1999
PICTURE OF EROSION-CORROSION
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PHOSPHORIC ACID WITH SOLID PARTICLES
MECHANICAL PROPERTIES
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Material
Heat Treatment
Soleil C5
UR35N
annealed
hardened 450°C-4h
Rm
Mpa
R0.2
Mpa
A%
%
HV5
HV10
KCV
750
560
18
200
240
80
600
400
25
240
270
180
100
UR35N(1.5%Cu) annealed
hardened 450°C-4h
170
300
UR35N(3%Cu)
280
340
annealed
hardened 450°C-4h
Italic printing corresponds to actual measurements on laboratory heats
Other data correspond to minimum values on industrial heats
Cold Hardening Coeff.
10% Elong.
0.145
0.125
EROSION-CORROSION by
SOLID PARTICLES
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Materials
Heat Treatment
Water
SiC 0.5mm
Testing Conditions (linear velocity : 1.5 m/s)
20% H2O(24.5 g/l NaCl) H2SO4 2N H2SO4 2N
Acetic Acid 0.5%
500 ppm ClQuartzite 4-9mm
SiC O.5mm SiC 0.5 mm
WL, mg (8h)
weight loss, % (5h)
Water 30%
Coal 4-10mm
WL, mg (5h) WL, mg (5h) WL, % (5hour)
UR35N
Annealed
4
23
34
53
0.1
AISI 304
Annealed
8
27.5
58
130
0.5
3CR12
0.55
UR45N
0.25
WL : Weight Loss
Corrosion-Erosion Rate ,
mm/yr
EROSION-CORROSION
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Solid particles : 50 g/l SiC 99 microns, Impact Angle
90d, Velocity 5.5 m/s, temperature 25°C/77°F
35
30
25
20
15
316L
S 31803
S 41500
10
5
0
0
2
4
6
pH (H2SO4)
8
10
EFFECT OF EROSION BYCliquez
SOLID PARTICLES
200 ppm Cl- , 20°C. Solid particles: 300 microns, 100 g/l
UR45N
8 m/s
5 m/s
2m/s
UR35N
316L
304L
0
500
1000
1500
2000
Erosion-Corrosion Rate, mdd (250 mdd=1mm/yr)
2500
3000
EFFECT OF EROSIONCliquez
BY SOLID PARTICLES
in 30% P205 synthetic phosphoric acid at 80°C/176°F
Corrosion rate (mm/yr)
1,5
Corrosion
Erosion-Corrosion
1,0
0,5
0
N08904
UR B6
32550/S32520
UR 52N+
S31266
UR B66
FIELD TESTS IN RHONE-POULENC
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Corrosion-Abrasion of Central Agitators
Di-hydrate process ( 80°C/176°F)
Corrosion rate (g)
50
Corrosion rate (mm/year)
1
0,5
40
- Dn1 reactor
- Samples attached to
surface agitators
- linear speed < 5 m/s
- test duration : 9 months
Samples fastened
to Surface Agitators
30
20
10
0
08926
32520
UR 52N + URB26
In GREECE
N 06625
UR 625
0
08028
URB6 32520
08904 UR 52N+ URB28
In BELGIUM
08926
URB26
UR 35N - 2304 DUPLEX Cliquez
IMPROVED ABRASION CORROSION RESISTANCE
1.0
H2O/Na2 SO4
+ Na Cl
+ Si O2
+ PH = 3
- V = 3 m/sec
9 ft/sec
80%
savings
Weight loss
0.4
0.2
C.Mn
steel
304L
2304
UR 35N
 UR 35N - Duplex 2304 has improved corrosion resistance
properties when considering water/aqueous solutions containing
chloride ions and/or abrasive particles (Si O2, sand...)
GENERAL BEHAVIOURCliquez
OF MATERIALS
Abrasion
vs
Corrosion
8
Co - Cr - Ni
+ W, Mo
etc
Résistance croissante
à l ’abrasion
7
Aciers outils
rapides
6
5
Fontes au
chrome
Moins cher que Co
plus performant
que les inox
8000
UR 52N+
4
500
HB
PH
(Mn +N)
Duplex
UR B6
3
2
1
400
HB
13/4
4003
3Cr 12
Aciers
durs
Sec
1
17/7
instables
13/4 Mo
16/5 Mo
304
Humide
2
Produits économiques
316
Corrosion croissante
3
4
5
- Tôles plaquées
- Revêtements et plaques anti-usure
- Mise en œuvre simple
6