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


ASTM A1011 CS Type B Impact Resistance

ASTM A1011 CS Type B Impact Resistance

ASTM A1011 CS Type B Impact Resistance

Can I expect this steel to have good Charpy impact resistance down at sub-zero temperatures (say, -40 deg. F)? If so, why? I have been told A1011 was developed for Arctic applications, but I have not found any published references in my search . I do notice that impact testing is not among the requirements or supplemental requirements for A1011, unlike ASTM A36 (which is listed as an alternate material but data suggests poor impact resistance at low service temperatures).

RE: ASTM A1011 CS Type B Impact Resistance

What do you consider good? >15 ft-lbs at -40 deg F? Are you sure about the ASTM designation Type B versus the other A1011 Grades? ASTM A1011 CS
Type B is a standard specification for hot-rolled, steel sheet and strip and coils of carbon steel, structural steel, high-strength low-alloy steel, high-strength low-alloy steel with improved formability, and ultra-high strength steel. The thickness for the above is 0.239" or less by specification, which would favor lower CVN values at lower temperatures.

RE: ASTM A1011 CS Type B Impact Resistance


  • I'm sure about the designations: The customer specifies either A1011 CS Type B or A36. The application needs impact resistance at -40 deg. F to prevent service fractures (I cannot go into details on why).
  • For Charpys, I consider good to be test fracture that is >50% shear. I'm not sure what the associated impact energy is, but that can be established through testing provided I meet the % ductility requirement.
  • Finally, you raised a question I never even considered: the component is 0.35" thick, meaning A1011 does not apply.
Any thoughts on structural steel plate or shapes that has good impact resistance at -40 deg. F and good formability (portions need to be bent 90 deg.)?

RE: ASTM A1011 CS Type B Impact Resistance

Look at bridge steels A588, A572 etc.

RE: ASTM A1011 CS Type B Impact Resistance

Of course! Thanks!

RE: ASTM A1011 CS Type B Impact Resistance

Don't expect high absorbed energy values at -40 without demanding impact testing to be done at -40 in your purchase order. A-36 can be purchased with impact testing to meet -40 requirements; however, without specifying same, one can expect transition temperatures up to and above 70F
In one instance we experienced brittle failure of A-572 at approximately 32F. Charpy testing in the subsequent failure analysis provided 4 - 5 ft-lbs absorbed energy at 32F adjacent to the fracture location. At the center of the web over 50 ft-lbs were obtained at 32 F,

RE: ASTM A1011 CS Type B Impact Resistance

Totally agree Stan. That recommendation was made to my customer as being essential if they continue to specify A36.

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!


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