Skip to main content

[MW:15808] RE: Hardness on NACE Material

By Materials & Welding

Dear Pradip,

Is the service is for upstream (offshore oil and gas) or downstream (oil and gas refining) environments.

If the service is for upstream environments then MR-0175-ISO-15156-2 requirements as stated below will be applicable. Refer Annex-A of MR-0175 for this.

Welding consumables and procedures that produce a deposit containing more than 1 % mass fraction nickel are acceptable after successful weld SSC qualification by testing in accordance with Annex B. ER-70S-2 and E-7018 will not have problem with respect to this issue. However advise would be  to get the " Confirmation from the consumable manufacturer", as welding consumables meet requirements of MR-0175/ISO-15156.

Thanks.


Pradip Goswami,P.Eng.IWE
Welding & Metallurgical Specialist
Ontario, Canada.
Email-pgoswami@sympatico.ca,
pgoswami@quickclic.net

Maximum acceptable hardness values for carbon steel, carbon-manganese steel and low-alloy steel welds


-----Original Message-----
From: pradip kumar sil [mailto:pradipsil@gmail.com]
Sent: Monday, October 29, 2012 7:31 AM
To: materials-welding
Cc: pgoswami@quickclic.net
Subject: Hardness on NACE Material

Dear Experts,
We are going to fabricate carbon steel to carbon steel pipe ( A-106 To A 106 Gr. B/ A-105/ A234 GR. B ) with NACE Specification as per MR-175 without POST WELD HEAT TREATMENT.
In this case how much is maximum limit of hardness in BASE METAL/HAZ & WELD MENT & where it is specified.
Can we use normal ER-70S2 filler wire & E-7018 Electrode ( Without HICC & SSIC Certificate ) Regards Pradip

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