Skip to main content

[MW:2786] Re: element reqd. for NACE

By Materials & Welding
First of all ascertain applicability of MR0175.
If yes,all carbon and loy alloy steels are acceptable at 22HRC max hardness provided they (1) contain less than 1% nickel(2)are used in one of the following heat treated conditions:
(a)hot rolled(carbon steels only)
(b)annealed
(c)normalized
(d)normalized and tempered
(e)normalized,austenitized,quenched and tempered or
(f) austnitized,quenched and tempered.
Hardness is the principal creterion.After welding also near HAZ chances are there for more hardness so invariably Stress Relief(PWHT) treatment is advisable for NACE application.
As far as SS is concerned,it shall contain atleast these elements in range;C-.08 max,Cr-16% min,Ni-8% min,P-0.045 max,s-.04 max,Mn-2% max, and Si-2% max.
Please note that effect of Ni is different in Pearlitic steels(CS) and in austenitic Stainless Steels
Regards
Aarpee

On Wed, Jul 22, 2009 at 4:35 PM, Jivan Dhamane <jivanadhamane@yahoo.co.in> wrote:
Dear PSP

Check it out sulphur content in the material it shd not more than 0.013 for pipe fittings and not more than 0.012 for pipes.

regards

jivan

--- On Wed, 22/7/09, Yadav Shiva <luvshiv2002@gmail.com> wrote:

From: Yadav Shiva <luvshiv2002@gmail.com>
Subject: [MW:2775] Re: element reqd. for NACE
To: materials-welding@googlegroups.com
Date: Wednesday, 22 July, 2009, 12:48 PM


Hi Prashant,
                  Check the Chemical Properties, Mainly the Cromium %
and carbon content.

On 7/22/09, prashant pansare <prashantpan_99@yahoo.co.in> wrote:
> Yes,but which element affects the ordinary material to gain the requirements
> of MR0175.
>
>
> --- On Wed, 22/7/09, Yadav Shiva <luvshiv2002@gmail.com> wrote:
>
>
> From: Yadav Shiva <luvshiv2002@gmail.com>
> Subject: [MW:2771] Re: element reqd. for NACE
> To: materials-welding@googlegroups.com
> Date: Wednesday, 22 July, 2009, 12:13 PM
>
>
>
> Dear prashant ,
>                            please describe what is your requirement
> clearly....  But from my understanding the CS/SS Material should meet
> the NACE Specification MR0175.
> Which service you need?
> On 7/22/09, prashant pansare <prashantpan_99@yahoo.co.in> wrote:
>> Dear all,
>> pl. explain which  element makes the ordinary CS/SS to CS/SS NACE & how?
>> psp
>>
>>
>>       Love Cricket? Check out live scores, photos, video highlights and
>> more. Click here http://cricket.yahoo.com
>> >
>>
>
>
>
>
>
>       Love Cricket? Check out live scores, photos, video highlights and
> more. Click here http://cricket.yahoo.com
> >
>

Love Cricket? Check out live scores, photos, video highlights and more. Click here --~--~---------~--~----~------------~-------~--~----~
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