Skip to main content

Re: [MW:22957] Quench,Temper material

By Materials & Welding
Hi,

Quenched and Tempered steels are weldable but due to the high carbon content (Hardenability) leading to a hard heat-affected-zone (HAZ) and susceptibility to cracking. Due to this reason there is  always a heat input limit recommended by the manufacturer for the welding of Q&T steels, as there can be problems with softening of the HAZ when the cooling rate of the weld is slower than that of the quenching process. This is why AWS D1.1 restricts oxygen gouging of Q&T steels. You can do other cutting or gouging process which produces less heat input on Q&T steels.

You may refer the below link for further reference.

http://www.twi-global.com/technical-knowledge/faqs/material-faqs/faq-are-quenched-and-tempered-qt-steels-readily-weldable/


Regards,
LALU
​LINKS MIDDLE EAST 
ABU DHABI, UAE​


On Thu, Jan 1, 2015 at 2:19 PM, Ali Asghari <asgharialigl@gmail.com> wrote:
Dear All
1-what is meaning of this paragraph on AWS D1.1: When quenched and tempered steels are welded, the heat input shall be restricted in conjunction with the maximum preheat and inter pass temperatures required. Such considerations shall include the additional heat input produced in simultaneous welding on the two sides of a common member. does any body have same exprience about this material?
2- For what Oxygen gouging of quenched and tempered steel shall be
prohibited but other thermal cutting or removal is permitted?

Regards.

--
You received this message because you are subscribed to the Google Groups "Materials & Welding" group.
To unsubscribe from this group and stop receiving emails from it, send an email to materials-welding+unsubscribe@googlegroups.com.
To post to this group, send email to materials-welding@googlegroups.com.
Visit this group at http://groups.google.com/group/materials-welding.
To view this discussion on the web visit https://groups.google.com/d/msgid/materials-welding/CALcH7WA-1Lc%3Dq15byZixJm%2BOYc766N2bWw-kiRqJN5pSbr75Tg%40mail.gmail.com.
For more options, visit https://groups.google.com/d/optout.

--
You received this message because you are subscribed to the Google Groups "Materials & Welding" group.
To unsubscribe from this group and stop receiving emails from it, send an email to materials-welding+unsubscribe@googlegroups.com.
To post to this group, send email to materials-welding@googlegroups.com.
Visit this group at http://groups.google.com/group/materials-welding.
To view this discussion on the web visit https://groups.google.com/d/msgid/materials-welding/CAOwU13vLPjdvYVxQceziE4hpsGtJ0Tfdm0i7Z4D%3D-DZ2MsHO7Q%40mail.gmail.com.
For more options, visit https://groups.google.com/d/optout.

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

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

The Schaeffler and Delong diagrams for predicting ferrite levels in austenitic stainless steel welds

By Materials & Welding
Introduction Ferrite is important in avoiding hot cracking in during cooling from welding of austenitic stainless steels. 'Constitution diagrams' are used to predict ferrite levels from the composition by comparing the effects of austenite and ferrite stabilising elements. The Schaeffler and Delong diagrams are the original methods of predicting the phase balances in austenitic stainless steel welds. Nickel and chromium equivalents A 'nickel equivalent' is calculated for the austenite stabilising elements and a 'chromium equivalent' ferrite stabilising elements. These are used as the axes for the diagrams, which show the compositional equivalent areas where the phases austenite, ferrite, martensite (and mixtures of these) should be present. Although intended to show the phase balance of weld fillers, these diagrams can also be used to illustrate the phase balance of the 'parent' material. There are different diagrams for dif...
Post a Comment
Read more