Skip to main content

[MW:2676] Re: 16 MN Steel ??

By Materials & Welding
Mr Soman,
So, the full info is like this at one place:

Dear All,

One Seagoing vessel has a repair to be carried out on a pipe.
The flange of the pipe is welded and the flange is broken in parts.

The only sketchy information available is the material of the flange is supposed
to be "16 MN (or 16 mn ??) steel". The vessel is in a remote port and material testing lab
is not available in the port. Can the members throw some light as to what this material
may be and what welding process / consumables may be used??

Consumables can be sent by road or similar transport, and the marine repair yard should be
having standard welding equipment for SMAW and possibly also for MIG/MAG & GTAW.
Following is the additional Info. received about our query on above subject. ::

The medium/ material passing through this pipe is a mixture of sea water and sand/silt as it is dredger.

The Pipe ID = 750 mm; OD = 820 mm

Thanks in Advance!

G. A. Soman
Principal

In Darukhana and other Mumbai steel markets 16MnCr5 is available, has air hardening characteristics for temper. But it may hardly be a flange material. I strongly suggest, you do a PMI for the material type, then a peck at welding can be taken.. Or, judging from the application, it looks like a casting. Please confirm on these aspects and may be some one will have a solution for you.
Regards,

Shashank Vagal


--- On Mon, 13/7/09, donboscomarine@vsnl.net <donboscomarine@vsnl.net> wrote:

From: donboscomarine@vsnl.net <donboscomarine@vsnl.net>
Subject: [MW:2674] 16 MN Steel ??
To: materials-welding@googlegroups.com
Date: Monday, 13 July, 2009, 3:28 PM


Dear All,

Following is the additional Info. received about our query on above subject. ::

The medium/ material passing through this pipe is a mixture of sea water and sand/silt as it is dredger.

The Pipe ID = 750 mm; OD = 820 mm

Rgds.

G. A. Soman
Principal

DON BOSCO MARITIME ACADEMY
Premier Automobiles Road,
Kurla West, Mumbai 400070
Tel:  (022) 2504 1585 / 2018; 25036344.  Fax: (022) 2504 0682
Email:  donboscomarine@vsnl.net
Website: www.dbma.in

Yahoo! recommends that you upgrade to the new and safer Internet Explorer 8
--~--~---------~--~----~------------~-------~--~----~
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