Re: [MW:34066] SA 765 Grade II ( Normalize + Temper)

Dear Sir,

Many thanks for brief information shared by your self.

Kindly note here,

PWHT  SR cycle for welded joint is at 620 deg cel only.

As the material grade SA765 Gr 2 as per mtc of actual material heat treatment condition : Noramalize (910°C) & Tempering ( 670°C for 8 hrs followed by air cool), hence to simulate N+ T condition before welding, I need to perform tempering on SA516 gr 70 plate which is in normalize condition.

Kindly share your opinion if I will go ahead with Tempering of plate @ 670°C for 8 hrs then Welding followed by SR @ 620°C for 8 hrs to simulate actual condition or reduction in temering time can be acceptable, it seems 16 hrs thermal cycle is quite high to achive impact in ASR stage.

On Wed, 15 Mar 2023, 01:54 P Goswami, <pgoswami@rogers.com> wrote:

Hello Chintan,

 

Both SA 765 Gr II & SA 516/70 are classified as P1 Gr2 as per Sec-IX. However, if you though between the lines of individual specifications in Sec-II, Pt-A, you'll notice subtle differences. The differences are with respect to heat treatment and Notch Toughness acceptance criteria. Usually, higher acceptance margins are called for SA 765, Gr II.

If your project specifications call for PWHT @ 670 Deg C that's too high for any C-Mn steels, say SA 516/70. In my opinion it would be advisable to test SA516/70 base metal first with a simulation heat treatment @ 670 Deg C. The soaking cycle could be as per UCS 56, assuming Sec VIII, DIV1 is the code of construction or the applicable code.

Based on the results it would be the judgement call to qualify PQR on 516/70 steels or not.

The soaking time calculation may be adopted as per the code of construction (DIV-1 o DIV-2).

Thanks.

 

Pradip Goswami.P.Eng, IWE.

Independent Welding & Metallurgical Engineering Specialist

Consultant: SNC Lavalin Inc. (Nuclear &Non-Nuclear)

Saudi Aramco Approved Designated Project Welding Engineer (DPWR)

Qatar Petroleum Approved, SME-Materials & Corrosion Engineering.

Linkedin: https://www.linkedin.com/in/pradip-goswami-2999855/

Email:pgoswami@rogers.com,pradip.goswami@gmail.com

Cell/Whasapp:1-905-9793232

 

 

On Mon, Mar 13, 2023 at 11:52 AM Chintan Raval <chintan51@gmail.com> wrote:

Dear Expert,

 

Kindly advice 

for subjected material I want to qualify PQR P1G2 ( normalize) to P1G2 ( normalize + temper) for impact application.

 

As lead time for forging SA 765 gr 2 is quite high I want to perform tempering on plate SA516 gr 70 (Normalize) to simulate actual condition of N+ T before welding.

 

Kindly  advice soaking time calculation for tempering cycle  @ 670 deg cel.

Plate thick 50 mm

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