×
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

410SS ductile-to-brittle transition temperature (dbtt)

410SS ductile-to-brittle transition temperature (dbtt)

410SS ductile-to-brittle transition temperature (dbtt)

(OP)
Hello everyone,

is there anyone know what is the 410SS DBTT value?
as i look at 4100SS mill cert to be used as a wellhead equipment (shall comply both API6A and NACE),
the material vendor guy said to me that 410SS cannot applicable to 'K' operating range (-75ºF), the min was only to 'P' (-20ºF)
since martensitic SS nature has poor impact value as the temperature decrease.

as far as i dig in google, i only found one s-curve (ductile to brittle behaviour) of 410SS from 'stainless steel' by joseph r davis. those book provide some s-curve graph, but the sudden impact value drop doesnt seem so steep. as i know, 4100SS need to be tempered around 1300ºF±25ºF to reach 22HRC max as per NACE limit. CMIIW.

does anyone know what's the DBTT value of 410SS? or is there any research or some documentation about charphy s-curve graph that explain this toughness problem.

regards

yudhi

RE: 410SS ductile-to-brittle transition temperature (dbtt)

410 typically has low charpy impact values at lower temperatures than anywhere from 0F to -50F, depending on strength level. Here's a link to typical values, look on page 7:

http://www.aksteel.com/pdf/markets_products/stainl...


A good choice similar to 410 but with much better low temperature impact properties is F6NM, as this alloy has nickel added to increase toughness at low temps.

RE: 410SS ductile-to-brittle transition temperature (dbtt)

Also you need to know if it is 410 (martensitic) or 410S (ferritic).

In the ferritic grades you need to know N + C, grain size, and thickness. It is rate for any of them to have useful toughness below room temp when they are over 0.125" thick.

In the martensitic versions you need to be aware of the heat treatment, the level of carbides, retained austenite, and tempering all have an influence on toughness.
The Ni modified alloys are commonly used when toughness or uniform properties in heavy sections are required.

= = = = = = = = = = = = = = = = = = = =
Plymouth Tube

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