Re: [MW:29099] grain size requirements for 321H stainless steel

ASTM NO                                                     No Of Grains/square mm  at  100X                                         Remarks

 1                                                                                   upto 1-1/2

2                                                                                    1 1/2-3 

3                                                                                      3-6

4                                                                                      6-12

5                                                                                      12-24

The above are having coarse grain which is best for creep resistance because of less grain boundary  

6.                                                                                    24-48

7                                                                                     48-96

8                                                                                     96 and over

The above are having fine grain Which is best for mechanical properties because more grain more strength 

hope that it is clear now.

  

THANKS & BEST REGARDS,

KG.PANDITHAN, BE, IWE,  CSWIP 3.1,

ISO 9712 Level 2 in VT,

ASNT-Level II in PT,MT,RT & UT,

LA ISO 9001-2015,

International Welding Engineer. 

CONSULTANT-WELDING & QUALITY

Mobile no: +919940739349

On Wed, Feb 13, 2019 at 7:45 AM ishwar kumar <ish8623@gmail.com> wrote:

1,2,3,4,5 Coarse grain and 6,7,8 fine grain

On 12-Feb-2019, at 6:18 PM, sandeep kumar <sandeepdhiman63@gmail.com> wrote:

Hi Ramin

Please note, my question is what does mean the coarse?

a higher ASTM no or smaller no.

Thanks.

On Monday, February 11, 2019 at 5:24:06 AM UTC+3, Ramin Kondori wrote:

This number is related to the Number of grains in an specific area.

higher number of grains means they are smaller grains or fine grain.

Ramin  Kondori

Sr. QA/QC & Welding Engineer

-----------------------------------------------------------

PG-Dip. in Welding Engineering (IWE  AT  0070)

BSc. in Civil Engineering (IUT)

BGAS Painting Inspector

ASNT Level I&II

                        

On Sun, Feb 10, 2019 at 2:22 PM sandeep kumar <sandeep...@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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