Corrosion
and acid resistant assembly components
| ISO designation of quality classes to ISO
3506 NF E 25-100
|
| Composition groups |
Austenitic
|
Martensitic
|
Ferritic
|
Steel
nuances
|
A1 |
A2 |
A3* |
A4 |
A5* |
C1 |
C4 |
C3 |
F1 |
|
Resistance
classes
Bolts, nuts, type 1 |
50
70 80 |
50
70
110 |
50
70 |
80 |
45
60 |
* Stability against inter-crystalline
corrosion by adding titanium and possibly niobium and tantalum.
| Chemical composition of austenitic steels
|
Steel
nuances
|
Chemical composition in %
(maximum
values where there is no other indication, the rest being steel Fe)
|
| C |
Si |
Mn |
P |
S |
Cr |
Mo |
Ni |
Cu |
| A1 |
0.12 |
1.0 |
6.5 |
0.200 |
0.15-0.35 |
16-19 |
0.7 |
5-10 |
1.75-2.25 |
| A2 |
0.10 |
1.0 |
2.0 |
0.050 |
0.03 |
15-20 |
- |
8-19 |
4 |
| A3* |
0.08 |
1.0 |
2.0 |
0.045 |
0.03 |
17-19 |
- |
9-12 |
1 |
| A4 |
0.08 |
1.0 |
2.0 |
0.045 |
0.03 |
16-18.5 |
2-3 |
10-15 |
1 |
| A5* |
0.08 |
1.0 |
2.0 |
0.045 |
0.03 |
16-18.5 |
2-3 |
10.5-14 |
1 |
* Stability against inter-crystalline
corrosion by adding titanium and possibly niobium and tantalum.
| Distinctive characters A1 / A2 / A4
|
| |
A1 |
A2 |
A4 |
| Character
|
Limited
corrosion resistance
|
Corrosion
resistant
|
Corrosion
resistant
|
| Limited
acid resistance
|
Acid
resistant
|
Highly
acid resistant
|
| Limited
weldability
|
Good
weldability |
Good
weldability
|
| Use
|
For
machined elements, limited acid and corrosion resistance
|
Standard
quality
|
The
highest level of corrosion resistance (with additional molybdenum),
spring elements are made out of steel containing martensitic chromium
C1, C2, C3 and are limited in corrosion resistance compared with A2, A4.
|
| Mechanical characteristics of assembly
elements made out of austenitic steels to ISO 3506
|
| Composition
group
|
Steel
nuances
|
Screw
resistance class
|
Diameter
range
|
Screw
|
Traction
resistance
Rm
N/mm2
min. |
Elasticity
limit
Rp02
N/mm2
min. |
Stretching
after breakage
Al
Mm
min. |
Test
constraint
Sp
N/mm2 |
| |
A1 |
50 |
<=M
39 |
500 |
210 |
0.6d |
500 |
| Austenitic
|
A2, A3 |
70 |
<=M
24 |
700 |
450 |
0.4d |
700 |
| |
A4, A5 |
80 |
<=M
24 |
800 |
600 |
0.3d |
800 |
| Minimum breakage torque for screws up to M5
to ISO 3506
|
| Nominal
thread diameter
|
Resistance
class
50 Nm |
Resistance
class
70 Nm |
Resistance
class
80 Nm |
| M 1.6 |
0.15 |
0.2 |
0.24 |
| M 2 |
0.30 |
0.4 |
0.48 |
| M 2.5 |
0.60 |
0.9 |
0.96 |
| M 3 |
1.10 |
1.6 |
1.80 |
| M 4 |
2.70 |
3.8 |
4.30 |
| M 5 |
5.50 |
7.8 |
8.80 |
| M 6 |
9.30 |
13.0 |
15.00 |
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ASSEMBLAGE
ZAC de la Prévauté
2, rue des Côtes d'Orval
BP49
78550 HOUDAN
France
|
Phone
: 33 (0)1 30 59 74 73
Fax : 33 (0)1 30 59 65 38
eMail : doc@satinox-assemblage.com |
|
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Code NAF : 518M - Code OTAN : F9667 |
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Member of the
"
Comité Aéro PME" trade body
