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Outgassing Rates Stainless Steels

Engineering Materials

Outgassing rates of stainless steels, along with the surface treatment and pumping time.

Material
Treatment
Outgassing rate
(torr-L/sec-cm2 )
Time meas.
(hours)
Test
method
Reference
Stainless steel
None
6.4x10-7
1h
-
Schamus (ref Markley, et al)
Stainless steel
degreased
4x10-7
1h
-
Schamus (ref Markley, et al)
Stainless steel
None
2x10-7
1h
-
Schamus (ref Blears, et al)
Stainless steel
None
2x10-8
10h
-
Schamus (ref Blears, et al)
Stainless steel
NS22S
Fresh
1.4x10-8
1h
Conductance
Elsey (ref Schram)
Stainless steel
ICN 472
fresh
1.3x10-8
1h
Conductance
Elsey (ref Schram)
Stainless steel
None
1.2x10-8
10h
 
Schamus (ref Das, et al)
Stainless steel
ICN 472
sanded
8.3x10-9
1h
Conductance
Elsey (ref Schram)
Stainless steel
NS22S
electro polished
4.3x10-9
1h
Conductance
Elsey (ref Schram)
Stainless steel
NS22S
mechanically polished
1.7x10-9
1h
Conductance
Elsey (ref Schram)
Stainless steel
fresh
1.5x10-9
10h
Conductance
Elsey (ref Schram)
Stainless steel
ICN 472
Polished & vapor degreased
1.4x10-9
10h
-
Schamus (ref Dayton, et al)
Stainless steel
None
1.4x10-9
10h
-
Schamus (ref Das, et al)
Stainless steel
NS22S
fresh
1.3x10-9
10h
Conductance
Elsey (ref Schram)
Stainless steel
ICN 472
sanded
1.0x10-9
10h
Conductance
Elsey (ref Schram)
Stainless steel
None
7.6x10-10
1h
 
Schamus (ref Das, et al)
Stainless steel
NS22S
mechanically polished
4.6x10-10
10h
Conductance
Elsey (ref Schram)
Stainless steel
NS22S
electro polished
4.3x10-10
10h
Conductance
Elsey (ref Schram)
Stainless steel
Baked 24h @ 200 ° C
1.5x10-10
1h
-
Schamus (ref Das, et al)
Stainless steel
None
1.1x10-10
100h
-
Schamus (ref Das, et al)
Stainless steel 304
Degrease + water rinse
4.0x10-11
40h
Conductance
Strausser
Stainless steel
U15C
Baked 25h @ 300°C
4.5x10-12
-
-
Elsey (ref Calder, et al)
Stainless steel
304
Degrease + water rinse,
baked in vacuum 150°C for 12h
4.0x10-12
5h after bakeout
Conductance
Strausser
Stainless steel
304
Electropolished,
baked 30h @ 250°C
3.0x10-12
-
-
Elsey (ref Young)
Stainless steel
U15C
Baked 45h @ 360°C
2.6x10-12
-
-
Elsey (ref Calder, et al)
Stainless steel
Baked 24h @ 200 ° C
9.3x10-13
100h
-
Schamus (ref Das, et al)
Stainless steel
U15C
Baked 3h in vacuum @
1000°C + 25h in situ @ 360 ° C
1.6x10-14
-
-
Elsey (ref Calder, et al)

Related: Outgassing Rates of Aluminium

Reference: Ferimilab

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