Re: [MW:21924] Re: Tensile Strength & PWHT

According to ASME IX QW 422, A335 Gr. P11 has the minimum specified tensile strength as 60ksi and this was what will be used during design process for the structure and not that quoted in the material test cert. All consideration with reference to this material are based on the minimum specified tensile strength. See below extract from ASME IX for you info.

 

QW-153.1 Tensile Strength.

Minimum values for

procedure qualification are provided under the

column heading

"Minimum Specified Tensile, ksi" of

Table QW/QB-422

. In order to pass the tension test, the

specimen shall have a tensile strength that is not less than

(a)

the minimum specified tensile strength of the base

metal; or

(b)

the minimum specified tensile strength of the weaker

of the two, if base metals of different minimum tensile

strengths are used; or

(c)

the minimum specified tensile strength of the weld

metal when the applicable Section provides for the use of

weld metal having lower room temperature strength than

the base metal;

(d)

if the specimen breaks in the base metal outside of

the weld or weld interface, the test shall be accepted as

meeting the requirements, provided the strength is not

more than 5% below the minimum specified tensile

strength of the base metal.

I hope this Clarifed your query.

 

Regards,

 

Rems Okonkwo

IWE NIGERIA

On Wed, Sep 17, 2014 at 6:52 AM, rajesh s. mhaske ,Engineer Welding ,PUNE,INDIA <rajesh.mhaske17@gmail.com> wrote:

Dear sir
         can you  provide the  clause no of B31.1  where  mention    >71ksi TS, requires PWHT for all thickness.

On Wednesday, September 17, 2014 12:27:09 AM UTC+5:30, Roshan Ravindran wrote:

Hello Everyone !

My question is 

Does the minimum specified tensile strength  (for eg: A335 Gr.P11) supersede the Actual Tensile Strength of that material (which we see in the material test certificate) for PWHT?

I can elaborate:

Min. TS of A335 Gr.P11 is 60ksi

As per B31.1, >71ksi TS, requires PWHT for all thickness.

But in MTC, for this material, Actual TS mentioned is 75ksi.

In this case, shall i proceed with PWHT or shall i stick to Min TS of that material?

Pls help, if you can provide any B31.3 interpretation with your answer, will be great..

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