×
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

code case 2506 the 16mnr

code case 2506 the 16mnr

code case 2506 the 16mnr

(OP)
code case 2506 the 16mnr is considered curve a.
 if the 16mnr is normalized that maybe considered curve b as per the note of the ucs 66 fig.
please help me, how can i prove all above is right
 

RE: code case 2506 the 16mnr

This is an ASME B&PV Code case, and pertains to the use of 16MnR pressure vessel steel plate under Chinese Standards. This material is considered as P-No 1 material for the purpose of PWHT. Under subsection (e) of Code Case 2506-1, this material shall be considered under Curve A for the purpose of impact requirments.

Please obtain a copy of this code case to prove your point.

RE: code case 2506 the 16mnr

(OP)
thanks for your reply.the ucs 66 note (b)(2) which describe
as the matel considered curve a shall be considered curue b if it has been normalized. and the 16mnr is considered curve a as per code case 2506.

all above is just like what i have right at 28 Apr 08 5:37 .

 

RE: code case 2506 the 16mnr

(OP)
thanks for your reply.the ucs 66 note (b)(2) which describe
as the matel considered curve a shall be considered curue b if it has been normalized. and the 16mnr is considered curve a as per code case 2506.

all above is just like that i have right at 28 Apr 08 5:37 .

 

RE: code case 2506 the 16mnr

No, knstar read the Code case. ASME  B&PV Code Cases are sometimes written with specific exceptions or requirements, which may go above and beyond existing Code rules. The reason for this is because of a lack of expierence with the proposed material. This is why they are called code cases.

RE: code case 2506 the 16mnr

(OP)
oh thank you,

i know what's your mean.

but the question has been answered by asme expert on the seminar of shanghai at 2007 .


问题1-10: GB6654中16MnR已被 code case 2506采用,案例中规定P-No.1材料适用UCS 66.1 Curve A。请问对这材料中考虑冲击试验时,用应力降低MDMT,或者采用正火材料取csc-66中曲线D,这些是否适用?(上海杨园)
 In code case 2506, GB6654 16MnR has been accepted as P-No.1. For purpose of post weld heat treatment, it is considered that Curve A in UCS 66.1 fits for P-No.1. When taking into account impact test requirement, is it possible to reduce the MDMT using the ratio of stress? Or is it possible to use curve D in accordance with the fact that 16MnR is normalized?
Answer:  Yes the provisions given in UCS-66(b) may be used to further reduce the MDMT from Fig. UCS-66.  In addition if this material is produced to fine-grain practice and normalized it may be assigned to Curve B.0 Z% R$ w4 i: Y; N/ u
答复:是的,在UCS-66(b)中的条款可用于进一步降低图UCS-66所确定的MDMT,另外,当材料经细晶化处理和正火处理,可列入曲线B。

but i don't know who can prove it correct and i don't know who make the answer for the quetion 1-10.
 

RE: code case 2506 the 16mnr

(OP)
i think your answer is enough for my question.

maybe the 16mnr(normalized) maybe considered curve b in the new adden or the new edtion.

but it is difficult now.

else, i think the lowest tempreture equal the max. thickness is 0.394 in the ucs 66 fig. but AI tell me the max. thickness should be considered as 0.375 as per the ucs 66 tab.

and i find out the code and books about the ucs 66 fig.

the result is the max. thickness is 3/8(0.375) in.

and i want to know the max. thickness in your meaning.

RE: code case 2506 the 16mnr

knstar;
The exemptions for impact testing for this material would only apply to Curve A, regardless of a normalization heat treatment. In other words, you cannot take credit for attempting to change the impact test exemptions (moving to Curve B) with heat treatment. Follow the rules for Curve A material in Fig UCS-66 for the thickness limits (0.394" or 10mm).

RE: code case 2506 the 16mnr

(OP)
WHERE CAN I FIND THE 0.394 OR 10 MM EXCEPT THE UCS 66 FIG.

in other way,is there any words give a define for the dotted line (x=0.394) which is the end of the lowest tempreture.

RE: code case 2506 the 16mnr

Review UCS-66 (a) in ASME B&PV Code, Section VIII, Div 1.

RE: code case 2506 the 16mnr

(OP)
i have done

but i can't find a word to supply the dotted line(x=0.394) intersect  the curve a/b/c/d at the lowest temperature of each curve.

we can find the 0.375 in the ucs 66 table.

but i don't think that the 0.375 is equal the lowest temperature.however i can't find a basis of this code to supply my idea.

RE: code case 2506 the 16mnr

knstar;
Regarding the answer posted above from an "asme" expert,

Quote:

For purpose of post weld heat treatment, it is considered that Curve A in UCS 66.1 fits for P-No.1.
. This is not a correct statement and is confusing. I am surprised that an "asme" expert would treat this material as any P-No 1 material. The Code case is quite clear that the reference to P-No 1 material is only for PWHT heat treatment, and Curve A must be used for impact requirements.  

RE: code case 2506 the 16mnr

(OP)
sorry, your quote is the chinese engineer's question. and the asme expert's answer as below word:


Answer:  Yes the provisions given in UCS-66(b) may be used to further reduce the MDMT from Fig. UCS-66.  In addition if this material is produced to fine-grain practice and normalized it may be assigned to Curve B.

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