Fwd: hardness limit for SA 516 Gr. 70

manoj john

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Apr 8, 2013, 1:56:20 AM4/8/13

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Dear All,

Regarding the subject matter I need to clarify one more thing:

I have another WPS without hardness test as per ASME SEC. IX and with impact test, is it possible to use this procedure without hardness test, all other variables are meeting the requirement or is it required to carry out hardness test for procedure qualification.

I have to carry out hardness test on the job.

Vessel Detail:

Vessel construction code is ASME SEC. VIII Div 1 Ed. 2010.

MOC : SA 516 Gr 70.

Shell / Dished end thickness : 22 mm/ 28 MM

Welding process : SMAW.

Heat treatment : NIL

Impact test : Required at minus 40 degree centigrade.

as per project spec. hardness to be checked and reported.

Welding procedure qualification details:

WPS No. 1 : Material : SA 516 GR 70.

Thickness range qualified : 16 mm to 50 mm (test coupon 25mm)

Welding process : SMAW

Electrode : E 7018-1

Qualification position : 3G

Preheating : 40 degree centigrade

Impact tested at minus 46 degree centigrade.

Heat treatment : Nil

Hardness test : 340 HV10

WPS No. 2 : Material : SA 516 GR 70.

Thickness range qualified : 16 mm to 36 mm (test coupon 18mm)

Welding process : SMAW

Electrode : E 7018-1

Qualification position : 3G

Preheating : 40 degree centigrade

Impact tested at minus 42 degree centigrade.

Heat treatment : Nil

Hardness test : not carried out.

Please give expert opinion.

Thanks and Regards.

On Sun, Apr 7, 2013 at 6:03 PM, manoj john <manoj...@gmail.com> wrote:

Dear members,

I have one pressure vessel to fabricate as per ASME Sec. VIII Div. 1 Ed. 2010. Client need hardness test and impact test requirement.

My doubt is that - Is it required the hardness test for welding procedure qualification test because I already have one qualified procedure as per ASME SEC IX with hardness and impact test but the hardness is on little higher side (HV10 340)

Please clear my doubt.

Thanks in advance

Manoj.

John Henning

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Apr 8, 2013, 10:53:23 AM4/8/13

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This is not an ASME Code issue – Code does not require hardness testing.

This is a customer/client requirement and would need to be negotiated with him/her. Note that 340HV10 (~322HBW) is a lot more than a little high. The required hardness range and number of tests or number of separate PQRs is only a negotiation issue between you and them. Without PWHT, hardness for carbon steel is directly related to heat input, welding sequence, etc. so hardness from one PQR may not be accepted for another PQR by your client unless there is substantial agreement in welding parameters.

There isn’t much help that can be given, I’m afraid.

John A. Henning

Welding & Materials

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manoj john

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Apr 9, 2013, 6:28:23 AM4/9/13

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Dear Mr. John,

Thanks for your information.

According to your information i can use both the WPS, there will not be a code issue but i have to discuss with client.

With Regards,

Manoj

pgoswami

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Apr 9, 2013, 8:19:49 AM4/9/13

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Manoj,

As pointed out by John Henning, this hardness value of 340 HV is extremely high for SA 516/70 steel welds.Typically where hardness restriction is imposed,PWHT is mandatory.

What're the design conditions, process fluid, to be handled.

Generally for -40 Deg design conditions PWHT should be mandatory as PWHT improves impacts, along with reduction of hardness.

Thanks

Pradip Goswami,P.Eng.IWE

Welding & Metallurgical Specialist

Ontario, Canada.

Email-p...@sympatico.ca,

pgos...@quickclic.net

From: material...@googlegroups.com [mailto:material...@googlegroups.com] On Behalf Of manoj john

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Subject: Re: [MW:17321] RE: 17307] Fwd: hardness limit for SA 516 Gr. 70

agum...@yahoo.com

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Apr 9, 2013, 11:15:05 AM4/9/13

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Hi maximum 200 HV , say me the thickness? If is more tha 19 mm need PWHT, is less 19 mm is probably very bad welding procedure in both case check WPS and PQR.

Agustin

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From: "pgoswami" <pgos...@quickclic.net>

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Date: Tue, 9 Apr 2013 08:19:49 -0400

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Subject: RE: [MW:17323] RE: 17307] Fwd: hardness limit for SA 516 Gr. 70