Skip to main content

[MW:2671] Re: Fw: [MW:2655] Repair WPS for 4130 to forge 4130

By Materials & Welding
Hi
HOW CAN TO PREVENT FROM SECONDRY EMBRITTLEMENT? IS THE ANOTHER CAUSES THAT PWHT MUST BE LESS THAN FROM TEMPERING TEMPERATURE ?
RJD

From: Muhammed Ibrahim <ibratech@gmail.com>
To: materials-welding@googlegroups.com
Sent: Sunday, July 12, 2009 4:00:51 PM
Subject: [MW:2658] Re: Fw: [MW:2655] Repair WPS for 4130 to forge 4130

Hi,
 
Take care when doing PWHT. If the material is quenched and tempered (check with Material TC), the PWHT temperature shall be less than tempering temperature. Otherwise the tensile test will fail.
 
Regards,
Ibrahim
2009/7/12 Ali Asghari <asghariali@rocketmail.com>
dear steven
i think full GTAW is better than combined processes.but you must apply high preheat to prevent from excessive hardness & occuring cold crack .(due to high amount of Ceq)

----- Forwarded Message ----
From: Steven Ko <stevenkmko@gmail.com>
To: materials-welding@googlegroups.com
Sent: Saturday, July 11, 2009 3:34:33 PM
Subject: [MW:2655] Repair WPS for 4130 to forge 4130

Hi Everybody out there,
 
We are going to conduct a repair WPS on 25mm thks.4130 pipe mat'l to 4130 forge for mat'l strenght of 80KSi with Nace requirement.
Intend to do with full GTAW or combine with SMAW. 
Anybody had experience on it please advice and your comment is highly apperciated.

--
Thanks you,

Best regards,
Steven










--
Thanks & Regards
Muhammed Ibrahim PK




--~--~---------~--~----~------------~-------~--~----~
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.
-~----------~----~----~----~------~----~------~--~---

Comments

Post a Comment

Popular posts from this blog

Re: [MW:34105] SA266 GR4N 4 Cycle SPWHT

By Materials & Welding
Hi,  You are correct, Minimum refers to the one cycle for which this part will expose until final work shop PWHT. hence mill test certificate shall include this.  Max. SPWHT, refers to additional cycles of heat treatment that are reserved for future repairs during equipment lifetime.  Again, these simulated no. Of cycles shall be specified in MTC.  The idea is we need to make sure that steel mechanical properties are not compromised upon exposure to multiple repairs (i e 4 cycles in your case).  One could say, if steel is subjected to 4 cycles and is ok, then it should by defacto be good for one cycle, yet, this is wrong assumption cause mechanical problems and microstructure of materials varies accordingly based on no. Of cycles for which material will expose. This is apparent in alloy steel and especially for impact test values as an example.  In your case, this forged CS with properties before PWHT can be understood to be " as forged" condition (i.e. Wit...
Post a Comment
Read more

Materails FAQs

By Materials & Welding
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...
21 comments
Read more

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

By Materials & Welding
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...
Post a Comment
Read more