SA105 N versus SA105
SA105 N versus SA105
(OP)
I am reviewing our plant standards with respect to material specs on our forged fittings and valves, etc. Is SA105 Normalized the preferred spec for this material in pressure service. I seem to recall it is but can't find any hard fast data. Can someone point me to any discussion papers or the like on this material.
Thx in advance,
Derek Pearcey
North Atlatic Refining
Thx in advance,
Derek Pearcey
North Atlatic Refining
RE: SA105 N versus SA105
chemical:
Carb=0.35 max
Mang=0.6 to 1.05
phosp=0.035 max
sulfur=0.040 max
silicon=0.10 to 0.35
copper= 0.4 max
nickel=0.4 max
chrom=0.3 max
Molyb=0.12 max
Vanad=0.05
columb=0.02
TENSILE STRENGTH 70000 PSI
YIELD STRENGTH 36000 PSI
HARDNESS 187 HB MAX.
RE: SA105 N versus SA105
RE: SA105 N versus SA105
The heat treated forging has a finer grain, hence more uniformity, and, generally speaking, better properties (minimum tensile properties do not change though).
Heat treatment may be annealing or normalizing, and there is not much difference between them, except that the former requires cooling in the furnace and is therefore more costly, I presume.
As the type of treatment is at supplier's choice if not specified, I guess that the suffix N implies a choice on the type of treatment.
prex
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