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Technical Discussions
majid
majid
16:26 Sep-06-2017
hardness rang

Dear sirs,
I have been measuring the hardness of A335 gr P9 for several time by equotip 550 leeb D and always the range is between 85 to 110 HB. my question is that what should be the hardness above mentioned metal by this method? It seems that this range is remarkable less than we expect for this metal.
thanks in advance.
best regards

 
 Reply 
 
Neil Burleigh
Sales
Krautkramer Australia Pty Ltd, Australia, Joined Dec 2002, 158

Neil Burleigh

Sales
Krautkramer Australia Pty Ltd,
Australia,
Joined Dec 2002
158
01:45 Sep-07-2017
Re: hardness rang
In Reply to majid at 16:26 Sep-06-2017 (Opening).

Dear Majid,
are you aware of the limitations of portable hardness testers? In particular rebound hardness devices?
Before we would make any further comment please tell us a bit more about the product you are performing the hardness test.
For example is it a pipe, what is the surface condition?
Regards

Neil Burleigh

 
 Reply 
 
P V SASTRY
R & D, NDT tecniques metallurgy
TAKEN VRS FROM THE POSITION OF SR. DEPUTY GENERAL MANAGER BHEL CORPORATE R&D, India, Joined Jan 2003, 195

P V SASTRY

R & D, NDT tecniques metallurgy
TAKEN VRS FROM THE POSITION OF SR. DEPUTY GENERAL MANAGER BHEL CORPORATE R&D,
India,
Joined Jan 2003
195
11:09 Sep-07-2017
Re: hardness rang
In Reply to majid at 16:26 Sep-06-2017 (Opening).


I agree with Mr. Neil Burleigh. There are some limitations for the echo tip hardness tester working on rebound principle.

As requested Please give the information of the product that you are working including section thickness etc.

It will not work ( gives ridiculously low values) if the section thickness is low like in some pipes etc.

Best wishes

P V SASTRY

 
 Reply 
 
majid
majid
12:43 Sep-07-2017
Re: hardness rang
In Reply to Neil Burleigh at 01:45 Sep-07-2017 .

Thanks a lot for your attention.
Hardness measuring principle is based on the dynamic (rebound) and the product specification is:

Pipe: 5"- A335 Gr P11
length: 12 m
thickness: 6.5 mm
surface roughness: > 15 µm

best regards

 
 Reply 
 
Christoph Frehner
Other,
Queretaro, Joined Oct 2016, 3

Christoph Frehner

Other,
Queretaro,
Joined Oct 2016
3
13:17 Sep-07-2017
Re: hardness rang
In Reply to majid at 12:43 Sep-07-2017 .

Dear Mr. Majid

As others already mentioned, the thickness is the problem in your case. For the Leeb D impact device a minimum thickness of 25mm is recommended. As your pipe has only 6.5mm you get the low readings.

For this application I would recommend you to use an UCI instrument. For this 5mm thickness is enough. As you already have an Equotip 550, there is the option to purchase the UCI probe only which can then be connected to your Equotip 550, please check here: https://www.proceq.com/compare/equotip-portable-hardness-testing/
Or let me know if you need more information.

 
 Reply 
 
P V SASTRY
R & D, NDT tecniques metallurgy
TAKEN VRS FROM THE POSITION OF SR. DEPUTY GENERAL MANAGER BHEL CORPORATE R&D, India, Joined Jan 2003, 195

P V SASTRY

R & D, NDT tecniques metallurgy
TAKEN VRS FROM THE POSITION OF SR. DEPUTY GENERAL MANAGER BHEL CORPORATE R&D,
India,
Joined Jan 2003
195
13:23 Sep-07-2017
Re: hardness rang
In Reply to majid at 12:43 Sep-07-2017 .


Dear Majid,

As I suspected, this pipe has a lower thickness of 6.5 mm and this hardness tester will not work for these thicknesses.

You have to use other methods like portable Ultrasonic hardness tester etc.

Best Wishes

P V SASTRY

 
 Reply 
 
majid
majid
06:48 Sep-09-2017
Re: hardness rang
In Reply to Christoph Frehner at 13:17 Sep-07-2017 .

Dear Christoph,
thanks for your recommendation. I will follow it.
Best Regards

 
 Reply 
 

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