×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • 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!
  • Students Click Here

*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.

Students Click Here

Jobs

Material Grade AISI 4130

Material Grade AISI 4130

Material Grade AISI 4130

(OP)
Hi All

The required material grade for Wellhead equipment is AISI 4130 with NACE MR-0175 compliance or material class API 6A EE (carbon or low alloy steel with NACE MR-0175 compliance) whereas vendor supplied the item with material grade AFNOR 30CD4.

My questions are as follow:

• Is material grade 30CD4 equivalent to AISI 4130 ? I’ve reviewed specs for both grade and found to be closely matching.
• Upon review of NACE MR-0175, it’s been noted that 30CD4 is not listed in it. I sent the same query to vendor and they’ve submitted their material specs which reads as 30CD4 is compatible with H2S service. Can we accept this ?

Appreciate your feedback.

RE: Material Grade AISI 4130

As far as I know,

API 6A doesn't mention that material for wellhead equipment need to be AISI 4130 for EE-NL class.
What API limit is steel composition (Table 9) which lead to mechanical properties (Table 6).
I've never come across with AFNOR material grade.
My opinion, given those AFNOR specs comply with all material constraint (i.e. Table 6 & 9) in API, then AFNOR 30CD4 might be acceptable.

for NACE constraint, NACE limit low alloy steel based on hardness (max 22HRC).
I think NACE gives us freedom to choose material (I believe its not necessary for NACE to mention all specs that comply with them as assurance).
Same comment, given the hardness comply, then it might be acceptable
unless there's another constraint that forbid us to challenge it, eg: client requirement that mention 4130 in exact or wellhead manufacturer material specs.

RE: Material Grade AISI 4130

(OP)
Thanks for your feedback Yudhichen.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

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!


Resources