Skip to main content

[MW:2010] Re: effect of H on notch strength

By Materials & Welding
hi chaps
do you say ,the notch strength is similar to tensile strength?if it is true,why tha strength in 200 is more than 50?
rjd

From: babu k <kbabupsg@gmail.com>
To: materials-welding@googlegroups.com
Sent: Tuesday, April 21, 2009 6:43:28 PM
Subject: [MW:2000] Re: effect of H on notch strength

Chaps,
 
Please find the attachment, hopefully clarify the things,
 


 
On Tue, Apr 21, 2009 at 7:36 PM, Ali Asghari <asghariali@rocketmail.com> wrote:
hi oven
thank you for answer,but i dont understand yet.
because the toughness in -100 is more than in 50,why?
another question:this figure is true in all steel?
regard advance

From: Owen Jenkins <owen@osjl.co.uk>

To: materials-welding@googlegroups.com
Sent: Sunday, April 19, 2009 12:20:17 PM
Subject: [MW:1985] Re: effect of H on notch strength

Ali,
The top line shows the toughness of the base material without hydrogen embrittlement occurring - toughness increases steadily with increasing temperature.
 
The lower, V-shaped line shows that the effect of hydrogen embrittlement is worst at about 50°C, decreasing rapidly as the temperature increases (and the ability of the hydrogen to diffuse out of the metal increases) and also decreasing at lower temperatures, where reaction rates are much lower and the density of hydrogen increases, hence its volume decreases.
 
Other may wish to add more to this simple approach. Does this help?
 
Regards,
Owen.
----- Original Message -----
Sent: Saturday, April 18, 2009 11:31 AM
Subject: [MW:1980] effect of H on notch strength



hi
can anybody explain about this picture?
rgds.










--
Thanks & regards,

K.Babu
Welding Engineer,
PPL Shipyard Pte Ltd
Singapore
HP:  +65 94815990
Skype: psgbabu



--~--~---------~--~----~------------~-------~--~----~
To post to this group, send email to materials-welding@googlegroups.com
To unsubscribe from this group, send email to materials-welding-unsubscribe@googlegroups.com
For more options, visit this group's bolg at http://materials-welding.blogspot.com/
The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.
-~----------~----~----~----~------~----~------~--~---

Comments

Post a Comment

Popular posts from this blog

Heat tint (temper) colours on stainless steel surfaces heated in air // Heat tint

By Materials & Welding
Introduction The colour formed when stainless steel is heated, either in a furnace application or in the heat affected zone of welds, is dependent on several factors that are related to the oxidation resistance of the steel. The heat tint or temper colour formed is caused by the progressive thickening of the surface oxide layer and so, as temperature is increased, the colours change.   Oxidation resistance of stainless steels However, there are several factors that affect the degree of colour change and so there is no a single table of colour and temperature that represents all cases. The colours formed can only be used as an indication of the temperature to which the steel has been heated. Factors affecting the heat tint colours formed Steel composition The chromium content is the most important single factor affecting oxidation resistance. The higher the chromium, the more heat resistant the steel and so the development of the heat tint colou...
Post a Comment
Read more

[MW:5202] RE: 5200] NDT after PWHT

By Materials & Welding
------------------------------------- Interpretation:  I‑89‑14 Subject:         Section I (1986 Edition, 1987 Addenda), PW‑11,                  NDE Prior to PWHT Date Issued:     December 15, 1988 File:            BC88‑393   Question: Does PW‑11 require that NDE be performed on welds after they have been subjected to the postweld heat treatment required by PW‑39?   Reply: No, unless the conditions described in PW‑11.2.2 exist. ---------------------------------------------- Interpretation:  VIII-1-98-09 Subject:         Section VIII, Division 1 (1995 Edition, 1996 Addenda); NDE                 ...
Post a Comment
Read more

Materails FAQs

By Materials & Welding
Q: What are equivalents for standard Q 235 B (and Q 235 A) for U-channels? (asked by: boris.vielhaber@vait.com) A: DIN Nr. = 2393 T.2, 2394 T.2, EN 10025 W. Nr. DIN 17007 = 1.0038 Design DIN 17006 = RSt 37-2, S235JRG2 (Fe 360 B) Q: What is St DIN 2391 BK material? (asked by: dmcandrews@automaticstamp.com) A: Precision steel tubes, cold-finished/hard. Q: What is C.D.W. Boiler Tube? (asked by: montydude123@yahoo.com) A: Cold Drawn Welded Boiler Tube. Q: WHAT IS W.Nr. 1.4301? PLS TELL US IN EASY LANGUAGUE (asked...
21 comments
Read more