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Re: [MW:16397] Effect of a little amount of Excessive Sulfur in P355NL2(EN BS 10028-3-2003)

By Materials & Welding

Additional Sulphur to an extent of O.001 present  should not create problem for your operational temperature
as the additional Mn available in the base metal. will neutralize the Sulphur in the form of Manganese Sulphide.

If Oxygen & Sulphur if added in a fracture of volume more , it may create low impact properties at higher temp.

For example,
for CVN impact at -100 deg.C, (E 8018-C2) Sulphur is controlled within 0.02 max.
for CVN impact at -60 deg.C, (E 8018-C1)  & at -50 deg. C ( E 8018-C3), Sulphur is controlled within 0.025 max.

Since your operation is at -7 deg. C, in my opinion, it should not create any problems.

Apart from impact, higher volumes of Sulphur  form low melting eutectics with Nickel to create hot  cracking
and also reduces tensile properties if not controlled.

All other elements present  other than C, Mn, Si are trace elements. It is

Sridhar.

From: M2M <hyperm2m@gmail.com>
To: materials-welding@googlegroups.com
Sent: Monday, 31 December 2012 11:30 AM
Subject: [MW:16389] Effect of a little amount of Excessive Sulfur in P355NL2(EN BS 10028-3-2003)

Dear All
 
I test a specimen of P355NL2(EN BS 10028-3-2003).but there is a problem in chemical composition.
As per BS EN 10028-3(2003) max sulfur(S) limited to 0.01. we can ignore ± 0.003 as permissible deviation.
 
Below table is my material 's chemical analyze. As you can see sulfur is 0.014.
with consideration of ± 0.003 as permissible deviation , just it is 0.001 exceeded.
 
 
I need to know what is effect of this little deviation( in sulfur) in mechanical properties of this material???
Does it have a big effect ???
I want to use my material in LPG tank(operation temp. is -7c).is it important or I can ignore this 0.001 sulfur????
 
Best Regards,
M2M
 
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