Just because google has the data doesn't mean that the lay person can derive understanding.
I'll bet that many folks (especially non-native English Speakers) will fail to get that "Thermomechanically rolled" implies microalloyed steels, which will not be evident unless one knows how to read the chems, which aren't patently obvious on the firs t couple of google hits I checked.
Data isn't knowledge.
I'll give better analysis in the AM.
milo
__________________
People say between two opposed opinions the truth lies in the middle. Not at all! Between them lies the problem, what is unseeable,eternally active life, contemplated in repose. Goethe
ST 52-3 is Werkstoffe number 1.0570 and is an unalloyed plain carbon fine grain steel:
.22 max C, 1.60 max Mn, Silicon killed (max .55 Si) and aluminum grain refined (.020 typical)- .04 max Sulfur and Phos per Stahlschlussel. The high manganese is typical of a tubing recipe and the low carbon allows fabrication by welding. Structural applications are the target for this material. I have seen Plate to this recipe as well.
S355M is a microallyed fine grained steel werkstoffe number 1.8823. It is captioned an alloy steel, though I donot see alloying additions high enough to meet that description. This steel is microalloyed (Al + Nb + Va +N) for mechanical properties, and is also optimized for structural uses by welding. Based on the Nitrogen kicker, I'd hesitate to use this material for any application requiring cold work.
heres some data:
Chemical Composition
Grade
S355M
WNr.
1.8823
Standard
SEW 083
Country
Germany
Old / Other name
BStE355TM
Heat Analysis
Element
Symbol
Min.
Max.
Aluminum
Al
0.015
Carbon
C
0.13
Columbium (niobium)
Nb
0.05
Manganese
Mn
1.6
Nickel
Ni
0.35
Nitrogen
N
0.02
Phosphorus
P
0.025
Silicon
Si
0.5
Sulfur
S
0.015
Vanadium
V
0.05
C + Mn/6 + (Cr + Mo + V)/5 + (Cu + Ni)/15
0.4500
Note the carbon equivalent formula to assure safe welding. Some call outs show Copper as high as .50 or .55 that I have seen.
The pragmatic difference between these two grades is that the s355M implies microalloy rolled and controlled cooled at the mill to assure mechanical properties. also, it is more likely found in bar or structural sections rather than tubing.
As you captioned ST52-3 , there is no assurance of any thermal treatment to assure minimum mechanical properties. You really need to go beyond the grade descriptors given, to the underlying DIN or EN specifications to see what the grade expectations / design intent really is...
milo
__________________
People say between two opposed opinions the truth lies in the middle. Not at all! Between them lies the problem, what is unseeable,eternally active life, contemplated in repose. Goethe
Actually am a Ralph Waldo Emerson Fan as well as Henry David Thoreau. Emerson's essay on compensation is a great of English Language thinking.
Thanks for your feedback!
milo
__________________
People say between two opposed opinions the truth lies in the middle. Not at all! Between them lies the problem, what is unseeable,eternally active life, contemplated in repose. Goethe
Different between ST52-3 and S355M
Re: Different between ST52-3 and S355M
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