×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Contact US

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!

*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

Temperature limit for ASTM A297 HF

Temperature limit for ASTM A297 HF

Temperature limit for ASTM A297 HF

(OP)
I have a cast stainless steel pipe class that requires ASTM A297 Grade HF for hot treat gas (primarily H2 with some 1-2 % H2S). Does anyone know why it would be limited to 920 F? Cannot seem to find B31.3 or B16.5 data on it.

RE: Temperature limit for ASTM A297 HF

kevlar49;
I have a publication from the International Nickel Company titled "Cast Heat-Resistant Alloys". I believe I had obtained this publication from the NiDI (Nickel Development Institute) web site.

Anyway, the publication contains good technical information on the various grades of cast, heat-resistant stainless steels; HH, HF, HK...

For Grade HF (19Cr-9Ni), from what I reviewed, this material is suitable for service temperatures up to 1600 deg F. You have as cast, and aged at 1400 deg F, furnace cooled, conditions. The publication contains tensile, elevated temperature tensile, creep and stress rupture data for this material. There is no reported drop in mechanical properties to limit application at 920 deg F.

RE: Temperature limit for ASTM A297 HF

(OP)
Sorry, meant HF modified.  Where can I find code allowable stresses?

RE: Temperature limit for ASTM A297 HF

kevlar49;
What is an HF modified? Is it given a separate heat treatment, 1400 deg F, held for 24 hours and furnace cooled or modified alloy composition?

I don't know of any specific allowable stress values for this material because ASTM A 297 is not endorsed by ASME B&PV Code. You will probably need to determine the allowable stress values on your own using ASME Section II.

Why don't you review ASME SA-451, which is Specification for Centrifugally Cast, Austenitic Stainless Steel Pipe for Elevated Temperature Service. The material grades are endorsed by ASME B&PV Code and have established allowable stress values.

RE: Temperature limit for ASTM A297 HF

kevlar49;
According to the information I have from another publication, the UNS designation for ASTM A 297 Grade HF is J92603, the chemical composition is listed below;
C  0.2-0.4%
Cr 18-23%
Mn  2% max
Mo 0.5% max
Ni 8-12%
P,S  0.04% max
Si 2% max

There is another version of HF, Grade HF30 UNS J92803


As I stated, if you want cast 347 pipe material, you need to reference SA-451

C  0.25-0.35%
Cr 19-23%
Mn 1.50% max
Mo 0.50% max
Ni 9-12%
P,S 0.040% max
Si 0.5-2.0%

In my further review of the 'Handbook of Stainless Steels' by Peckner and Bernstein, the reported wrought match to Grade HF is Type 302B stainless steel, with higher carbon content. You can take this to the bank. There is no mention of a modified HF. I also checked ASTM A 297, there is no modified HF.

As I stated, you are better off referring to ASME SA 451, not ASTM A 297.

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! Already a Member? Login



News


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