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Re: [MW:30623] Difference Between SA 266 Gr.2 and SA 266 Gr.4

By Materials & Welding
hi... can any let me know were i can get this material in india.....
dhairyalloys.da@gmail.com

On Thursday, April 11, 2013 at 5:30:14 AM UTC+5:30, Purav Desai wrote:
Hi Ramdas,
 
The only difference in SA 266 Gr. 2 & SA 266 Gr. 4 is, content of Manganese is approximately double (0.8~1.35) in SA 266 Gr. 4 than SA 266 Gr. 2 (0.4~1.05). These materials are widely used for body flanges, tubesheets, backing devices of heat exchangers and vessels.
 
Hence the element that makes difference is manganese. Manganese has various advantages as below;
 
It increases tensile strength, toughness and hardenability. Manganese also tends to increase the rate of carbon penetration during carburizing and acts as a mild deoxidizing agent. Manganese is capable to form Manganese Sulphide (MnS) with sulphur, which is beneficial to machining. At the same time, it counters the brittleness from sulphur and is beneficial to the surface finish of carbon steel.
 
The disadvantage is when you use SA 266 Gr. 4, carbon equivalent will be above 0.42 which is not allowed as per most specifications and specially for HIC or Wet H2S/sour service most client prefers to maintain Ceq. below 0.40.
 
Apart from above, from the design point of view it does not make any difference because ASME has considered same allowable stress values for both the grades.
 
Hence as per me it is always good to consider SA 266 Gr. 2.
 
Please correct me if i miss some points.
 
 
Regards;
 
Purav Desai.


On Wed, Apr 10, 2013 at 3:54 PM, <ramdas.swati@gmail.com> wrote:
Hi,
Can anyone explain me what is difference between SA 266 Gr.2 and SA 266 Gr.4
When we use SA 266 Gr. 2 and when we use SA 266 Gr.4

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Regards;

Purav DESAI

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