Re: [MW:29081] grain size requirements for 321H stainless steel

Recent development is 347HFG

On Sun, 10 Feb 2019 8:20 pm pgoswami <pgoswami@quickclic.net wrote:

Higher is the ASTM No,finer is the grain size.Finer grain size(7 & up) is better for all mechanical properties, while coarser grains (ASTM No 4 to 7) are good for creep resistance. 

ASTM specifies this range in order to have a balance of all properties in 300 series of ASS.

Thanks. 

Sent from my Bell Samsung device over Canada's largest network.

-------- Original message --------

From: Kannayeram Gnanapandithan <kgpandithan@gmail.com>

Date: 2019-02-10 17:23 (GMT+05:30)

To: materials-welding <materials-welding@googlegroups.com>

Subject: Re: [MW:29076] grain size requirements for 321H stainless steel

Coarse for high creep strength and fine for high UTS

On Sun, 10 Feb 2019 4:22 pm sandeep kumar <sandeepdhiman63@gmail.com wrote:

Dear all

Please advise your views on below query:

ASTM A182 10.1.2 Grades F 321H, F 347H, and F 348H shall have a

grain size of ASTM No. 7 or coarser.

What does it stand for coarser? 

Does it mean a higher ASTM grain size no (e.g. 8, 9 and so on) or lower ASTM grain size no. (e.g. 6, 5, 4 and so on)?

Thanks & regards

Sandeep 

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