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#20327 - 08/27/08 10:03 PM Normalization and Fine Grain Practice
Farid Masood Offline

Registered: 01/23/08
Posts: 64
Loc: Pakistan Lahore
Dear all,

how can we determine that a material can be found both in normalized and fine grain sized form. I am trying to check SA-106 B. I have refered to ASME SEC-II A but there nothing is wriiten about this particluar material with regard to normalization and fine grain practice.
if we go for SA-516 70, ASME SEC II A mentions normalization for this material.

In ASME SEC II A, for a number of materials we have some heat treatement procedures but I am not sure whether that comes under normalization catergory or not and similarly fine grain size practice.

I am trying to use curve C of UCS66 for some maeterials for which it is manadatory to have such materials both in normalized and fine grain sized.
Farid Masood
Static Equipment Design Engineer

#20629 - 09/10/08 04:05 PM Re: Normalization and Fine Grain Practice [Re: Farid Masood]
Ray_Delaforce Offline

Registered: 01/02/03
Posts: 743
Loc: Houston, TX
Hello Farid

Fine grain can be confusing. The term refers to the size of the grain structure (crystal size) of the metal. If you can achieve a fine grain, the metal generally can generally operate at a lower temperature. For example, SA 516 60 has a small grain size than SA 515 60, and can consequently operate at a lower temperature. The practice of using normalising heat treatment re-grows smaller grains at the grain boundaries, thus perhaps doubling the number of grains per square inch.

If an SA 106 B pipe is normalised, you may be able to use for lower temperatures.
Ray Delaforce
CADWorx & Analysis Solutions
Hexagon PPM

#20673 - 09/11/08 11:43 AM Re: Normalization and Fine Grain Practice [Re: Ray_Delaforce]
EJL Offline

Registered: 05/28/07
Posts: 9
Loc: Alberta, Canada
To my knowledge fine grain practice can be determined in two ways. The first would be to specify grain refining elements be added at the manufacturing stage. I do not know of the specifics but addition of aluminum is one way to force a smaller grain size. The second method is to perform a test which determines the grain size. This is done by packing in graphite and then measuring grain size.

I have heard of companies spending the money and impact testing SA-106 B in an attempt to use it at lower temperature and were not able to use much material.



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