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- since 1996 -
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Technical Discussions
Suneel Sharma
R & D, Senior Manager NDT, ASNT NDT Level III
CHW Forge (P) Ltd, India, Joined Mar 2010, 18

Suneel Sharma

R & D, Senior Manager NDT, ASNT NDT Level III
CHW Forge (P) Ltd,
India,
Joined Mar 2010
18
10:42 Dec-11-2013
Rebound and UCI based Hardness Tester's acceptiblity as per ASTM A 370

Dear Members,

We are a Forging manufacturer and we made job according to ASME Section II code where grade SA105 (Clause 7.4) and SA182 (Clause 8.6.1) specifications says “hardness test to be done as per ASTM A 370” and ASTM A 370 only permit Indentation Hardness test methods as per ASTM A 370, ASTM E110 and ASTM A 833 but UCI and Rebound methods are not recommended by these specifications. Therefore both method not acceptable as per ASTM A 370. So how we satisfy this requirements by digital hardness tester based on rebound or UCI method.

is this Interpretation is right?

 
 Reply 
 
anjafo
NDT Inspector
Norway, Joined Aug 2009, 204

anjafo

NDT Inspector
Norway,
Joined Aug 2009
204
21:52 Dec-11-2013
Re: Rebound and UCI based Hardness Tester's acceptiblity as per ASTM A 370
In Reply to Suneel Sharma at 10:42 Dec-11-2013 (Opening).

to me it sounds like the customer needs to decide if they accept it or test another way.

 
 Reply 
 
Daniele Turetti
Director,
TemaFlux srl, Italy, Joined Dec 2013, 6

Daniele Turetti

Director,
TemaFlux srl,
Italy,
Joined Dec 2013
6
09:13 Dec-17-2013
Re: Rebound and UCI based Hardness Tester's acceptiblity as per ASTM A 370
In Reply to Suneel Sharma at 10:42 Dec-11-2013 (Opening).

If ASTM 370 permits ASTM E110 you can use portable HBW 10/3000 hardness tester "king" or "Model 134" type, if portability is your what you need.

 
 Reply 
 
Suneel Sharma
R & D, Senior Manager NDT, ASNT NDT Level III
CHW Forge (P) Ltd, India, Joined Mar 2010, 18

Suneel Sharma

R & D, Senior Manager NDT, ASNT NDT Level III
CHW Forge (P) Ltd,
India,
Joined Mar 2010
18
16:12 Dec-17-2013
Re: Rebound and UCI based Hardness Tester's acceptiblity as per ASTM A 370
In Reply to Daniele Turetti at 09:13 Dec-17-2013 .

Mr. Daniele,
ASTM A370 refer to ASTM E110 for portable hardness test and we are using King hardness tester for our product. But we are facing problem when our customers checking hardness by UCI or Rebound and found wrong readings on forgings.

 
 Reply 
 
S V Swamy
Engineering, - Material Testing Inspection & Quality Control
Retired from Nuclear Fuel Complex , India, Joined Feb 2001, 787

S V Swamy

Engineering, - Material Testing Inspection & Quality Control
Retired from Nuclear Fuel Complex ,
India,
Joined Feb 2001
787
22:22 Dec-17-2013
Re: Rebound and UCI based Hardness Tester's acceptiblity as per ASTM A 370
In Reply to Suneel Sharma at 16:12 Dec-17-2013 .

Dear Suneel,

There are many methods of hardness testing - indentation, rebound etc. and they are not directly comparable to each other. It is essential to specify how the hardness is measured at different stages of manufacture. Since the finished forging can only be tested by a portable instrument that does not leave a noticeable indentation, a method that is essentially non-destructive has to be mutually agreed upon with range of values produced by that method. In event of any doubt, only the indentation method and the values obtained by a piece sectioned from the forging after the final heat treatment would be used.

Thus it is important to preserve the traceability of the piece cut off from the forging so that the indentation readings are indeed representative of the actual forging.

 
 Reply 
 
Carlo
Carlo
22:25 Dec-17-2013
Re: Rebound and UCI based Hardness Tester's acceptiblity as per ASTM A 370
In Reply to Suneel Sharma at 16:12 Dec-17-2013 .

Dear Suneel,
have you tryed to perform comparison test on a certified calibration block? or on cal block verified by laboratory hardness machine (more accurate than portable one)?
Other problem is related to wall thickness of piece under control. Which is the examined wall thickness?

Carlo

 
 Reply 
 

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