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Important Facts on
Stainless Steel
Chemical composition (Excerpt from DIN EN ISO 3506)
Group
Class
Chemical composition (mass in %) 1 )
C Si Mn P S Cr Mo Ni Cu Remarks
Austenitic
Martensitic
0,15 16 5 1,75
A1 0,12 1 6,5 0,200 - - 0,7 - - 2
), 3 ), 4 )
0,35 19 10 2,25
15 8
A2 0,10 1 2 0,050 0,03 - 5
) - 4
6
), 7 ), 8 )
20 19
17 9
A3 0,08 1 2 0,045 0,03 - 5
) - 1 6
), 9 )
19 12
16 2 10,5
A4 0,08 1 2 0,045 0,03 - - - 1
10
), 8 )
18,5 3 14
16 2 10,5
A5 0,08 1 2 0,045 0,03 - - - 1 9
), 10 )
18,5 3 14
0,09 11,5
C1 - 1 1 0,050 0,03 - - 1 -
10
)
0,15 18
0,17 16 15
C3 - 1 1 0,040 0,03 - - - -
0,25 18 2,5
0,08 0,15 12
C4 - 1 1,5 0,060 - - 0,6 1 - 2
), 10 )
0,15 0,35 14
Ferritic
15
F1 0,12 1 1 0,040 0,03 - 6
) 1 -
18
11
), 12 )
1
) Single values are maximums.
12
) Sulfur (S) may be replaced by Selenium (Se).
13
) If mass content of Nickel (Ni) is less than 8.0%,
mass content
of Manganese (Mn) has to exceed 5.0 %.
14
) If mass content of Nickel (Ni) is more than 8.0%,
minimum content of copper (Cu) is not required.
15+6
) May contain Molybdenum (Mo) as per manufactu
rers choice. Limit of Molybdenum (Mo) content by
order of customer.
17
) If mass content of Chromium (Cr) is less than 17
%, mass content of Nickel (Ni) has to exceed 12%.
18
) May contain Nitrogen (N) up to 0.22 % if mass content
of Carbon (C) is less than 0.03 %.
9
) Must contain Titanium (Ti) 5 x Carbon (C) up to
0.8 % max. or Tantalum (Ta) and/or Niobium
(Nb) up to 10 x Carbon (C) to max. of 1.0 %
total weight and has to be marked according to
this table.
10
) Carbon (C) content may be higher as per manufacturers
choice to a max. of less than 0.12 %
mass content.
11
) May contain Titanium (Ti) 5 x Carbon (C) to max.
of 0.8 % mass content.
12
) May contain Niobium (Nb) and/or Tantalum (Ta)
10 x Carbon (C) to a max. of 1.0 % mass contant.
12
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