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SA105 N versus SA105

SA105 N versus SA105

SA105 N versus SA105

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

RE: SA105 N versus SA105

SA105N, is a Carbon Steel forgings for piping appications.
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

RE: SA105 N versus SA105

I understand that both A105 and A105N have the same chemical composition. The designation "N" is normalization. In the present, most manufacturers make A105N without special request from the purchaser. It is not a good practice to order A105 without normalization. You can specify SA105N as material for pressure vessel service in plant.

RE: SA105 N versus SA105

Heat treatment is almost mandatory for A-105 used for pressure parts; only flanges with rating 300 and below may be exempted.
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.

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