×
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

NACE MRO175

NACE MRO175

NACE MRO175

(OP)
During these last years, I found that there is a lot of different opinions about the use of "improved or enhanced machinabilty of austentic stainless steels according to Nace MRO175-2009. I'm talking  to standard Astm 304/304L and 316/316L and NOT to free machining stainless steel as Astm 303.In particularly, I'm reffering to those austenitic grade Calcium - Sulphur Treated according to a steel making procedure where a special  morphology of inclusions are obtained in order to reduce the  tool  crater wear and  improves machinability. Obviously, the content of S& and P% are less than < 0,03% ( Nace said <0,045%). The main brands in Europe and USA are UGIMA,PRODEC,MAXIVAL,SANMAC, PROJECT 70 (7000) and so on. These popular grades (304-316) could give some problem during welding in terms of floating, slagging of weld pool together a irregular geometry of weld pool ( surface tension).  This could be  the  main reason why these kind of Ca-treated grades could cause difficulties. The rest of products ,obtained by machining,forging,extrusion,cold drawing and so on  are not involved in this trouble.
Therefore, because C,Cr,Ni, Mn,Si and mainly S&P% are according to Nace, there is no reason why these Ca-treated grades couldn't be  according to above Nace.
Thank you in advance for you opinions.

 

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