Re: [MW:3721] P No- 1 Material

I am giving my opinion based on experience.

As HIC requirements are there PWHT has to be carried out at minimum 620 C to maintain the hardness within limit. On the other hand thickness of Plate is 132mm where after simulation of 11 hrs Tensile properties goes down specially in core (middle crosssection of plate). When tensile test from 1/4 T or 1/2 T taken there are possibility that UTS value goes below 485MPa.

Solutions

1)If client spec does not specify for simulation of extra cycle, ask mill to do test for reference and if pass no issues. If it fails just keep those value for reference.

2)Try to convinve Client to accept the PWHT Cycle with lower soaking time (ASME). I am not sure which design / manufacturing code is being used.

3)Check with design people if you use Gr 60 or Gr 65 instead of Gr 70, so that dropping of tensile strength can be taken care. These grades Mills can supply easily

Regards.
CK

2009/11/23 Rana, Jignesh <jignesh.r@thyssenkrupp.com>

Dear All,

I have an equipment to be installed in sour services.

Material – SA 516 Gr. 70 (HIC tested plates), 132 mm thickness.

For PWHT the soaking time is 5.30 Hrs as per project specification. Considering one cycle for future site / modification requirement, the total simulation time works out to be 11 Hrs.

PWHT Temperature – 620 Deg .C.

What would be behavior of material below LOWER TRANSFORMATION TEMPERATURE (P No. 1), against this cycle? (Tensile property, Impact property).

All reputed mills are denying for supply with the simulated testing condition (620 DEG C and 11 Hrs. Soaking Time).

Regards,

JIGNESH R RANA

Messages sent by email can be manipulated by third parties and are therefore generally not legally binding. This message contains confidential information that may be privileged or protected from disclosure. If you are not the intended recipient, please be advised that you have received this email by mistake. You are requested to notify us immediately by return email and delete this email from your system. Any use, copying, distribution or printing of information by the unintended recipient is strictly prohibited. Thank you.

Regd. Office: Uhde House, Vikhroli (West), Mumbai 400 083, India
Tel: 91-022-6796 8000, Fax: 91-022-2578 4327 Website: www.uhdeindia.com

--
To post to this group, send email to materials-welding@googlegroups.com
To unsubscribe from this group, send email to materials-welding-unsubscribe@googlegroups.com
For more options, visit this group's bolg at http://materials-welding.blogspot.com/
The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.

--
C. K. Purohit
Eng-Tech Weld1
Sr Welding Inspector

--
To post to this group, send email to materials-welding@googlegroups.com
To unsubscribe from this group, send email to materials-welding-unsubscribe@googlegroups.com
For more options, visit this group's bolg at http://materials-welding.blogspot.com/
The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.

Heat tint (temper) colours on stainless steel surfaces heated in air // Heat tint

Introduction The colour formed when stainless steel is heated, either in a furnace application or in the heat affected zone of welds, is dependent on several factors that are related to the oxidation resistance of the steel. The heat tint or temper colour formed is caused by the progressive thickening of the surface oxide layer and so, as temperature is increased, the colours change. Oxidation resistance of stainless steels However, there are several factors that affect the degree of colour change and so there is no a single table of colour and temperature that represents all cases. The colours formed can only be used as an indication of the temperature to which the steel has been heated. Factors affecting the heat tint colours formed Steel composition The chromium content is the most important single factor affecting oxidation resistance. The higher the chromium, the more heat resistant the steel and so the development of the heat tint colou...

Materails FAQs

Q: What are equivalents for standard Q 235 B (and Q 235 A) for U-channels? (asked by: boris.vielhaber@vait.com) A: DIN Nr. = 2393 T.2, 2394 T.2, EN 10025 W. Nr. DIN 17007 = 1.0038 Design DIN 17006 = RSt 37-2, S235JRG2 (Fe 360 B) Q: What is St DIN 2391 BK material? (asked by: dmcandrews@automaticstamp.com) A: Precision steel tubes, cold-finished/hard. Q: What is C.D.W. Boiler Tube? (asked by: montydude123@yahoo.com) A: Cold Drawn Welded Boiler Tube. Q: WHAT IS W.Nr. 1.4301? PLS TELL US IN EASY LANGUAGUE (asked...

The Schaeffler and Delong diagrams for predicting ferrite levels in austenitic stainless steel welds

Introduction Ferrite is important in avoiding hot cracking in during cooling from welding of austenitic stainless steels. 'Constitution diagrams' are used to predict ferrite levels from the composition by comparing the effects of austenite and ferrite stabilising elements. The Schaeffler and Delong diagrams are the original methods of predicting the phase balances in austenitic stainless steel welds. Nickel and chromium equivalents A 'nickel equivalent' is calculated for the austenite stabilising elements and a 'chromium equivalent' ferrite stabilising elements. These are used as the axes for the diagrams, which show the compositional equivalent areas where the phases austenite, ferrite, martensite (and mixtures of these) should be present. Although intended to show the phase balance of weld fillers, these diagrams can also be used to illustrate the phase balance of the 'parent' material. There are different diagrams for dif...

Materials & Welding

Search This Blog