where expertise comes together - since 1996 -

The Largest Open Access Portal of Nondestructive Testing (NDT)

Conference Proceedings, Articles, News, Exhibition, Forum, Network and more

where expertise comes together
- since 1996 -

21174 views
Technical Discussions
ravi prajapati
ravi prajapati
11:22 Sep-28-2009
MPT of Stainless steel

Why Magnetic particle testing is not possible for Stainless steel?

1
 
 Reply 
 
anjafo79
NDT Inspector
Norway, Joined Aug 2009, 204

anjafo79

NDT Inspector
Norway,
Joined Aug 2009
204
12:33 Sep-28-2009
Re: MPT of Stainless steel
In Reply to ravi prajapati at 11:22 Sep-28-2009 (Opening).

most simply put it is not magnetic enough.

1
 
 Reply 
 
Chris Galay
NDT Inspector
Portugal, Joined Sep 2009, 2

Chris Galay

NDT Inspector
Portugal,
Joined Sep 2009
2
23:48 Sep-28-2009
Re: MPT of Stainless steel
In Reply to ravi prajapati at 11:22 Sep-28-2009 (Opening).

The reason why stainless steel cannot be inspected by magnetic particle testing is that we cannot induce a magnetic field on the material as this is non-magnetic. We need a flux leakage so a magnetic field must be present. I hope this will help in your query.

Chris

1
 
 Reply 
 
Nigel Armstrong
Engineering, - Specialist services
United Kingdom, Joined Oct 2000, 1096

Nigel Armstrong

Engineering, - Specialist services
United Kingdom,
Joined Oct 2000
1096
03:10 Sep-29-2009
Re: MPT of Stainless steel
In Reply to anjafo79 at 12:33 Sep-28-2009 .

Its only the austenitic stainless steels which are incapable of magnetisation. The ferritic stainless steels ARE ferromagnetic. Apply a small permanent magnet to the test-piece if you are uncertain whether a material is austenitic or ferritic stainless steel.

2
 
 Reply 
 
Tom Colter
Engineering,
Bechtel Plant Machinery Inc., USA, Joined Nov 1998, 3

Tom Colter

Engineering,
Bechtel Plant Machinery Inc.,
USA,
Joined Nov 1998
3
00:55 Sep-30-2009
Re: MPT of Stainless steel
In Reply to ravi prajapati at 11:22 Sep-28-2009 (Opening).

For a good expalanation of which stainless steels are paramagnetic (can't be subjected to MPT) and which ones are ferromagnetic (can be subjected to MPT) go to this link:
Magnetic Stainless Steel or Not

1
 
 Reply 
 
Jim Draper
Consultant, ASNT Level III MT PT RT VT
Draper NDT, USA, Joined Jul 2009, 99

Jim Draper

Consultant, ASNT Level III MT PT RT VT
Draper NDT,
USA,
Joined Jul 2009
99
01:17 Sep-30-2009
Re: MPT of Stainless steel
In Reply to Tom Colter at 00:55 Sep-30-2009 .

It is true that you can perform mag particle testing on ferritic stainless steels. The easiest method of determining if the material can be mag particle inspected is to see if a permanent magnet is attracted to it. The three elements which are ferromagnetic are iron, nickel and cobalt.

1
 
 Reply 
 
NIMBANNA
NIMBANNA
07:11 Oct-01-2015
Re: MPT of Stainless steel
In Reply to ravi prajapati at 11:22 Sep-28-2009 (Opening).

All stainless steel materials are nonferrous hence not possible for magnetise the same. For magnetic particle testing, flux leakage is must which is not possible in this case. Hence Magnetic particle testing is not possible. To find out the defects, we may carry out RT / UT which will suffice the requirements.

1
 
 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
09:26 Oct-01-2015
Re: MPT of Stainless steel
In Reply to NIMBANNA at 07:11 Oct-01-2015 .

Pl. correct your understanding of the subject of stainless steels. All stainless steels are not non-magnetic - ferritic stainless steels and martensitic stainless steels etc. are magnetic. Only austenitic stainless steels in fully annealed condition are non-magnetic (paramagnetic).

Best regards

S V Swamy
Metallurgist and Quality / NDT professional (now retired)

3
 
 Reply 
 
Narayana Prasad.N
Narayana Prasad.N
13:00 Oct-01-2015
Re: MPT of Stainless steel
In Reply to NIMBANNA at 07:11 Oct-01-2015 .

I disagree with your statement that all stainless steels are non ferrous
Regards

3
 
 Reply 
 
Hello Sir
Engineering, welding inspector
Tekfen, India, Joined Sep 2009, 1

Hello Sir

Engineering, welding inspector
Tekfen,
India,
Joined Sep 2009
1
06:47 Feb-20-2017
Re: MPT of Stainless steel
In Reply to Jim Draper at 01:17 Sep-30-2009 .

Hi

Is it possible to perform MPI on Feritic Austenitic steel? pls explain sir

 
 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
08:42 Feb-20-2017
Re: MPT of Stainless steel
In Reply to Hello Sir at 06:47 Feb-20-2017 .

Ferritic Austenitic Stainless Steels also called duplex steel could be magnetic. As already explained earlier, check whether the material is magnetic or not using a permanent magnet. If the magnet is attracted to the material, MPT is feasible.

Swamy

 
 Reply 
 

Product Spotlight

NOVO Armor 15 & NOVO Armor 22

The Armor Kit Contains the NOVO Armor, which provides additional mechanical protection to the NOVO 1
...
5WN & NOVO 22WN Detectors, the Armor Stand and a traveling soft cover. - Newest shock absorbent technology case - Water resistant design - Supports wired & wireless communication - Multiple positioning options - Tripod connection using the Built-in 1/4” threads - Simple Detector battery replacement
>

OmniScan™ X3 flaw detector

The OmniScan X3 flaw detector is a complete phased array toolbox. Powerful tools, like total focus
...
ing method (TFM) images and advanced visualization capabilities, enable you to complete your inspection with greater confidence.
>

High-performance Linear Phased Array Probes

Available to order from stock in a range of 5MHz – 7.5MHz and from 16 to 64 elements. Designed w
...
ith piezo-composite elements, Phoenix phased array probes provide high-resolution imaging to maximise sensitivity; accurate ultrasonic detection and sizing of defects in welds; and effective corrosion mapping. Housed in a rugged stainless steel case for on-site industrial NDT applications.
>

Research Center IDEKO develops an ultrasonic train wheel inspection system for CAF

The Basque Research centre IK4-IDEKO has developed a state-of-the-art ultrasonic inspection system f
...
or the train wheel. This system secures a sound condition of train wheels and is thus a significant contribution to rail transport safety. The device was delivered to CAF recently and its use allows the manufacturer to become an approved supplier of rolling stock in Italy, as it meets the demanding homologation standards of this country. \\\\r\\\\n
>

Share...
We use technical and analytics cookies to ensure that we will give you the best experience of our website - More Info
Accept
top
this is debug window