THROUGH THICKNESS DUCTILE TESTING

[manoj john]

Dear members,

 

One of my client technical specification calls for through thickness ductile testing for plate thickness above 40 mm.

 

Can you give information about through thickness ductile testing & why we need to carry out this testing?

 

With kind regards.

Manoj

[ravi]

This test gives info about the resistance of plate to lamellar tearing. (Property reqd is %RA)

For more details on type of specimen and acceptance criteria please follow SA 770.

Regards,

Ravi

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[James, GeraldJayakumar]

Short transverse tensile test or through thickness ductile testing is carried out to determine the Ductility of the plates in the Z direction. Due to presence of rolled oxide & Sulphide inclusions, the ductility in the Z direction will be vastly reduced which leads to Lamellar tearing and also HIC. To prevent this normally through thickness testing is recommended for high thickness plates.

 

J.Gerald

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[muthusrinivasan muthuselvam]

Dear Mr.Manoj..

 

Reference standard in Euro norms En10164-- there you willget the total details including test specimen preparation..

 

Client has to specify whether they need Z15 or Z 25 or Z 40 etc..

 

specimens has to be prepared like tensile specimen but location is through the thickness and the same will be tested like ultimate tensile stressing but the accepance criteria is not the ultimate load.. acceptance criteria is the (original diameter -distorted diameter)/original diameter in %

 

br,

 

msms

On Wed, Mar 2, 2011 at 1:45 PM, manoj john <manoj...@gmail.com> wrote:

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[joshi jaydeep]

Reason to carry out through thickness tensile testing:

 

There are chances of Sulphide Segregation in the rolling direction of plate (You can check it by Sulfur Print Test).

 

The presence of segregation and lemination, there are chances of lower % reduction area then required.

 

The above condition may cause the Lamillar Tearing during / after fabrication.

 

Reg

JJ

On Wed, Mar 2, 2011 at 1:45 PM, manoj john <manoj...@gmail.com> wrote:

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[manoj john]

Thank you Mr.Muthusrinivasan Muthuselvam for your information.  I got a plate of thicnkness 125 mm, material S 275 JR . The certificate shows only tensil and chemical properties and not mentioned anything about heatreatment. I doubt whether this plate pass the through thickness ductile test.  If it fails in teting what should be the next action means whether normalizing will improve the properties?

 

Thanks

Manoj

[hpi001]

Dear Manoj,

This requirement should be taken in account when purchasing steel
plates. Executing a normalizing heat treatment afterwards on rejected
plates will normalize your material structure but mostly not dissolve
the present manganese sulphite inclusions which often causes not
satisfying the required % RA. So in such case in my opinion you need
to order new material with the required Z quality mentioned in your
purchase order.

Best Regards,

Herman Pieper

On Mar 4, 6:02 pm, manoj john <manojac...@gmail.com> wrote:
> Thank you Mr.Muthusrinivasan Muthuselvam for your information.  I got a
> plate of thicnkness 125 mm, material S 275 JR . The certificate shows only
> tensil and chemical properties and not mentioned anything about
> heatreatment. I doubt whether this plate pass the through thickness ductile
> test.  If it fails in teting what should be the next action means whether
> normalizing will improve the properties?
>
> Thanks
> Manoj
> On Thu, Mar 3, 2011 at 10:25 AM, muthusrinivasan muthuselvam <
>
>
>
>
>
>
>
> msm...@gmail.com> wrote:
> > Dear Mr.Manoj..
>
> > Reference standard in Euro norms En10164-- there you willget the total
> > details including test specimen preparation..
>
> > Client has to specify whether they need Z15 or Z 25 or Z 40 etc..
>
> > specimens has to be prepared like tensile specimen but location is through
> > the thickness and the same will be tested like ultimate tensile stressing
> > but the accepance criteria is not the ultimate load.. acceptance criteria is
> > the (original diameter -distorted diameter)/original diameter in %
>
> > br,
>
> > msms
>

[Kristian Lund Jepsen (KUJ)]

The reason to require tests to EN 10164 (for example Z-35 test) is to verify the strength and ductility in the z-direction (out-of-plane). Z-35 is basically a minimum elongation from the yield point to fracture of 35%. It guarantees that the integrity is OK even when we may have plastic deformation in the out-of-plane direction.

Such tests are usually required for heavy wall thickness (>40 mm) when the steel plate or section is used in construction with joints/nodes with very high utilization of the steel out-of-plane. For example for plates or beams, where lifting lugs are welded to. But it may also be relevant to many other joints, depending on the structural design (and design calculations).

Otherwise, if only lamination may be the problem (and for plates betwenn 6 mm and 40 mm thickness, requiring "z-properties", lamination checks are carried out by ultrasonic scanning according to EN 10160.

regards
Kristian

[manoj john]