Impact test requirement for JO and JR grades in structural fabrication.

[arvinda shan]

Dear Experts,

 

For crosshead installation in jetty project, the following materials (37mm) are used.

 

Road way            - S355JO

Crosshead           - S355JR & S275JR

Pipe track            - S355JR

 

As per European structural steel standard EN10025 , for JR grade, Longitudinal charpy V-notch impacts 27J @20 degrees and for JO grade, Longitudinal charpy V-notch impacts 27J @ 0 degrees.

 

We received materials mill certificates w/o impact test.

 

My question is whether impact is mandatory for above grades or any criteria of thickness as per EN10025? Please mention with reference codes.

 

Your valuable suggestions are appreciated.

 

Regards

 

arvinda

 

[muthu barathi]

Yes CVN is mandatory. you may carry out the impact test as per requirement and
if it passes go ahead


On Sat, 10 Sep 2011 13:59:21 +0530 wrote

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Dear Sir,





Thanking You,

Honesty is the best Policy

With Warm Regards,

Muthu Barathi P
Mobile No:00962788269821 (Jordan)
00962775401951

Treat yourself at a restaurant, spa, resort and much more with Rediff Deal ho jaye!

[Dinesh Somwanshi]

whats your design load & temperature range from the project specification.

regards

din

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[K.Babu]

Hi Aravind,

 

CVN is mandatory, as indicated in red your email for these grades (EN 10025-2, S27JR, S355JR &J0)

Your project spec. is may not call for the requirement of CVN.

 

 

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Thanks & regards,

K.Babu
Singapore

[K.Babu]

Hi Aravind

 

Sorry, CVN requirement for the JR is depends on your PO , but is not mandatory as like J0 grades.

 

Refer Cl 7.3.2.2 of EN 10025-2

[Vino Varghese]

Dear Arvinda,

 

The Impact requirement depends on Design Parameter of the Project.

Please check whether Contract / Project Spec / Service calls for impact.

 

Thanks & Regards

Vino-Doha

 

_________________________________________________________________________

 

 

On Sat, Sep 10, 2011 at 10:40 AM, arvinda shan <arvin...@gmail.com> wrote:

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[Harish Kannepalli]

Impact test is mandatory for t>6mm, if the material is going for low temperature service.

2011/9/10 arvinda shan <arvin...@gmail.com>

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regards,

Harish.

[Eswaran samikannu]

Hi Harish,

 

You want to settle this comments cut the test coupon & test the impact value for each heat no &  wittness with third party and attach with mill certificate is accptable.

 

Regards

Jegan

SWI CSWIP 3.2

From: Harish Kannepalli <harishka...@gmail.com>
To: material...@googlegroups.com
Sent: Saturday, 10 September 2011 11:15 PM
Subject: Re: [MW:12414] Impact test requirement for JO and JR grades in structural fabrication.

[arvinda shan]

Dear all,

 

Thanks for your valuable suggestions.

 

Contractor insists CVN is applicable only beyond 100mm thickness for structural as per BS EN 10025-2 table 9 option 28. I'm not satisfied with that. In company specification, nowhere specified about impact. In company document, materials shall be as per BS EN 10025.

 

As per BS EN 10025-1 , CVN is required more than 6mm of nominal thickness.

 

My question is If they don't need CVN, why they are using such materials ? Also my recommendation is also CVN required for Jo and Jr grades. Any criteria based on thickness? .

 

Any reference plz. clarify.

 

Arvinda

[Pieper QSI]

Dear Sirs,

 

The project requirements perhaps depend on design parameter but this has nothing to do with the requirements mentioned in material specification.

EN 10025 chapter 7.4.2.4 mentions that when Charpy impact tests need to be proven by tests on the materials delivered it should be agreed in front (purchase order) for material grades JR (Supplement requirement 9).

For material grades J0 it’s a standard requirement so every certificate should mention results of impact test (req. >27J at 0 °C) for this specific heat number and therefore material delivered with certificates without mentioning impact values should be rejected.

 

Met vriendelijke groeten / Best Regards

 

Herman Pieper

 

Pieper Quality Support & Inspection

Phone: +31 (0)521 380083

Fax:     +31 (0)84 7539225

Cell:     +31 (0)6 51691215

www.pieper-qsi.nl

[arvinda shan]

Dear sir,

 

So thickness is not the criteria for impact testing of structural materials? Need impact test on each heat number more than 6mm of thickness? Am I right?

 

Regards

 

Arvinda.

[Kristian Lund Jepsen (KUJ)]

Whether CVN test is required or not – and also the criterions – are very much dependent on the design code being  applied.

 

Is design code Eurocode 3 (EN 1993-series standards)?

If so, you will see in the design code that CVN will normally not be required for Concequence Class (CC), CC1.

For consequence class CC2 and CC3 you can see the charpy impact test requirements for each EN 10025 steel quality in EN 1993-1-10.

 

It is dependent on following parameters:

a)      Your minimum design temperature

b)      The maximum thickness of the relevant steel quality

c)       The utilization in the design

 

regards

Kristian

[Pieper QSI]

Yes, for grades J0, For grades JR only when agreed in purchase order.

 

Met vriendelijke groeten / Best Regards

 

Herman Pieper

 

Pieper Quality Support & Inspection

Phone: +31 (0)521 380083

Fax:     +31 (0)84 7539225

Cell:     +31 (0)6 51691215

www.pieper-qsi.nl

 

[shaik amjad]

in which specification it is mention about thickness > 6mm , 

[Javed]

Dear Arvind,

Impact test is mandatory whenever ,there is lower service temperature,Grades you have specified might be impact tested by the mill,coz these grades are generally used for low service temperature.