×
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

what does the "temper" mean in II-D?
2

what does the "temper" mean in II-D?

what does the "temper" mean in II-D?

(OP)
hi,
in table 1A given in asme II-D , there is a title 'Class/Condition/Temper".
what does the "temper" mean? is it referring to heat treatment of tempering, which seems not make sense ?

the question may be fundamental, sorry for my english.

thanks in advance

RE: what does the "temper" mean in II-D?

(OP)
another clause in UG-8:
"The tubes, after finning, shall have a temper or condition that conforms to one of those provided in the
governing specifications, or, when specified, they may be furnished in the “as‐fabricated condition” where the finned portions of the tube are in the cold worked temper (as‐finned) resulting from the finning operation, and the unfinned portions in the temper of the tube prior to finning."
the same question about the word "temper".

RE: what does the "temper" mean in II-D?

Tempering is a process of heat treating, which is used to increase the toughness of iron-based alloys. Tempering is usually performed after hardening, to reduce some of the excess hardness, and is done by heating the metal to some temperature below the critical point for a certain period of time, then allowing it to cool in still air. The exact temperature determines the amount of hardness removed, and depends on both the specific composition of the alloy and on the desired properties in the finished product. For instance, very hard tools are often tempered at low temperatures, while springs are tempered at much higher temperatures.

Working metal introduces stresses in the material; different amounts dependent on the method of working. Hence the statements in the standard that talk about "cold worked" (as opposed to hot-rolled, or something else).

Converting energy to motion for more than half a century

RE: what does the "temper" mean in II-D?

I agree with Gr8blu.

Typically, when a temper/class/condition is required, it refers to a certain level of hardness. That level of hardness - and to a lesser extent, other material properties - is known to be as uniform as possible, based on the temperature and time of the tempering heat treatment.

The devil is in the details; she also wears prada.

RE: what does the "temper" mean in II-D?

(OP)
hi, Gr8blu and DVWE,
Thanks for your reply.
i know what tempering heat treatment is referring to.
my question lies in its meaning in UG-8.
here is another sentence excerpted from general notes of SB-26 table-4 in SECTION II-B.
"Temper designations:
F As fabricated.
O Annealed.
T1 Cooled from an elevated temperature shaping process and naturally aged to a substantially stable condition.
T4 Solution heat-treated and naturally aged to a substantially stable condition.
T5 Cooled from an elevated temperature shaping process and then artificially aged.
T6 Solution heat-treated and then artificially aged.
T7 Solution heat-treated and stabilized.
"
from symbol F to T7, they stand for complete different condition of the material, but are all taken as a temper. does this temper referring to "tempering heat treatment"?
i doubt it.

hope for your further clarification.

RE: what does the "temper" mean in II-D?

Looking at your example of SB-26 material, go to Table 1B of II-D. You will see that the allowables vary with the different tempers.

Thus temper in the column heading in II-D is not a specific tempering method. It is merely the place where, if different tempers listed in a particular material specification will affect the allowable, then they will be noted here so you can select the appropriate row of the table.

RE: what does the "temper" mean in II-D?

(OP)
hi, Geoff,
thanks for your reply.
i agree that temper here is not tempering heat treatment.
i guess it is generally equal to the word "condition", or something like that .
i just wonder why temper has such a practice.
thank you all.

RE: what does the "temper" mean in II-D?

They use 'Class/Condition/Temper' to cover all of the different options for different alloys.
The key is 'a temper of condition conforming to the governing specification'.
With some materials you are allowed to leave them as finned.
Some (stainless in some cases) require a full anneal after finning.
The condition has to match a listed one in the Code.

= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, consulting work welcomed

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