Friday, March 13, 2009

[MW:1759] Clarification [MW:1758] Re :[MW:1752] Chemistry requirements for ASME A179 tube matl for meeting NACE MR 01-75

Dinesh,
 
I apologize for merging your request with Ravi's question.  The principles are the same so you'll need to compare the particular grade of API 5L piping with respect to what I commented on NACE MR0175.
 
regards

--- On Fri, 3/13/09, Dave Mohr <davemohr01@yahoo.com> wrote:
From: Dave Mohr <davemohr01@yahoo.com>
Subject: [MW:1758] Re: Re :[MW:1752] Chemistry requirements for ASME A179 tube matl for meeting NACE MR 01-75
To: materials-welding@googlegroups.com
Date: Friday, March 13, 2009, 3:45 AM

Good morning Dinesh, or whatever time it is where you are.
 
Based on a quick reviews of the spec I think ASTM A179 would comply with NACE MR0175 (2002) which specifies materials that are resistant to sulfide stress cracking (SSC).  ASTM A179 addresses seamless low carbon steel tubing that was cold drawn followed by a 1200F heat treat to obtain a maximum hardness of 72 HRB.  Nickel is not a delibrate alloying addition to A179 steel tubing.
 
NACE MR0175 Section 3 on ferrous materials states the following:
 

3.2.1 All carbon and low-alloy steels are acceptable at

22 HRC maximum hardness provided they (1) contain

less than 1% nickel, (2) meet the criteria of Paragraphs

3.2.2, 3.3, and Section 5, and (3) are used in one of the

following heat-treat conditions:

(c) normalized;

(d) normalized and tempered;

(a) hot-rolled (carbon steels only);

(b) annealed;

(e) normalized, austenitized, quenched, and tem-

pered; or

(f) austenitized, quenched, and tempered...

 

Section 3.2.2 states:

 

3.2.2 The metal must be thermally stress relieved

following any cold deforming by rolling, cold forging, or

another manufacturing process that results in a permanent

outer fiber deformation greater than 5%. Thermal stress

relief shall be petformed in accordance with the ASME

Code," Section VIII, Division 1, except that the minimum

stress-relief temperature shall be 595°C (1,IOO"F). The

component shall have a hardness of 22 HRC maximum.

 

Section 3.3 states:

 

3.3.1 Free-machining steels shall not be used.

 
Section 5 addresses fabrication processes, e.g. overlays, welding, etc.
 
Best Regards,
 
Dave

--- On Fri, 3/13/09, dinesh verma <dineshverma08@rediffmail.com> wrote:
From: dinesh verma <dineshverma08@rediffmail.com>
Subject: [MW:1754] Re :[MW:1752] Chemistry requirements for ASME A179 tube matl for meeting NACE MR 01-75
To: materials-welding@googlegroups.com
Date: Friday, March 13, 2009, 1:40 AM

what are tests and acceptance criteria if the api 5l material is asked to comply NACE MR 0175
THANKS
Dinesh
On Wed, 11 Mar 2009 09:51:36 -0000 materials-welding@googlegroups.com wrote

Could one you give Chemistry requirement details for ASME A179 tube
material to be certified as meeting NACE MR 01-75 / ISO15156
requirements.

Thanks in advance,

Ravi
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