Smart questions
Smart answers
Smart people
Join Eng-Tips Forums
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Member Login




Remember Me
Forgot Password?
Join Us!

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips now!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

Join Eng-Tips
*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.
Jobs from Indeed

Link To This Forum!

Partner Button
Add Stickiness To Your Site By Linking To This Professionally Managed Technical Forum.
Just copy and paste the
code below into your site.

ASTM A105N vs A105 for Globe Valve BodyHelpful Member!(3) 

Johnrem (Petroleum) (OP)
16 Mar 10 14:05
Hi every specialist;

Could someone explain in which case we shall specify ASTM A105N instead of A105 as a body valve material?
Is A105 technically acceptable as alternative material when A105N is specified by client specification?

Thanks
 
Helpful Member!(2)  rneill (Mechanical)
16 Mar 10 14:46
A105 is not an acceptable substitute if the client has specifically called for A105N. The normalizing heat treatment will ensure the forging has superior properties to the "as forged" material.

There is a wide range of technical documents (papers etc.) available which question the acceptability of A105 material within the range of services for which it is typically accepted by established design codes and the client is likely aware of these technical problems and thus specified A105N material.  A few specific examples of issues:

API RP14E:  Para. 4.1 (b) specifies that A105 material should be normalized for service temperatures below 30 F (-1 C).

ASTM A105:  The ASTM specification itself requires all flanges for service greater than ASME Class 300 be normalized as well as all piping components other than flanges, which are NPS 4 or greater, and intended for service in systems rated greater than ASME Class 300, to be normalized.

NACE MR0175/ISO 15156:  In general, NACE/ISO requires carbon steel material used in sour service to be in a heat treated condition (e.g., normalized). However, there is a general exception to this for A105 material (para A.2.1.3) but some end users do not allow the use of this exception.

You would also want to read the document "Recommendations for Pipe Flanges made in Forged Steel complying with ASTM A105" published by the Belgium Chemical Risks Directorate which reinforces (in much more detail) the limitation expressed in API RP 14E.
tigeralum (Mechanical)
16 Mar 10 14:51
Great post rneill
Helpful Member!  hsbcn (Mechanical)
16 Mar 10 14:52
The "N" in A105N stands for "Normalization" of A105. There is no chemical difference between the two, though A105N offers safety and other improvements on A105, such as finer graining and uniformity. The widely preferred A105N is also the industry standard, so you won't get A105 unless you ask for it. And can find it.

Heather Smith
My interests: Alloy valves, duplex valves, super duplex valves, 6Moly valves, inconel valves, incoloy valves, alloy 20 valves and titanium valves.

Johnrem (Petroleum) (OP)
16 Mar 10 16:26
Many thanks to Rneill and Smith

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!

Back To Forum

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close