Skip to main content

Re: [MW:32526] PQR-Qualified in Duplex Stainless Steel UNS-31803 / WPS-UNS-32750

By Materials & Welding
There are certain points to be considered.

1. Though both UNS-31803 & 32750 falls under same P-No: 10H / 1 but their UTS values are different. UNS 31803 welded using consumable ER 2209 which produces a UTS value of 90ksi whereas UNS32750 shall be welded with a consumable which has a UTS valiue of 120Ksi and hence preferred ER2594.

2. ASTM G48 tests are mandatory to ascertain its suitability to service, UNS31803 tested at temperature of 25degC whereas UNS 32750 tested at  40dgeC and hence suitable welding consumable to be selected.

3. Generally welds are considered anodic when compared with the Basemetal due to its area and corrosion are localized in welds. UNS 31803 has a PREN value of 34 whereas UNS 32760 has a PREN value of 40 due to its high alloy elements.

4. Moreover for Duplex and superduplex stainless steels are governed by various Clients specifications which will be more demanding and will not permit.

Hence WPS for UNS31803 cannot be used for UNS32750.

Hope our experts can add more points to clarify.

Thanks & Regards

J.Gerald Jayakumar



On Monday, 27 September, 2021, 08:42:20 am IST, Muhammad Azeem <azeem7999@gmail.com> wrote:


Gents,
I need your kind reference comments to clarify regarding the separate WPS required for each UNS in P-10H qualification ..
If PQR qualified with UNS-31803 Duplex Stainless Steel.
WPS can be prepared with UNS-32750 Super Duplex Stainless ...



Regards,

Muhammad Azeem Iqbal

--
https://materials-welding.blogspot.com/
https://www.linkedin.com/groups/122787
---
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 view this discussion on the web visit https://groups.google.com/d/msgid/materials-welding/f8e9def5-aaca-41f7-9d07-abc3d1836bd3n%40googlegroups.com.

Comments

Post a Comment

Popular posts from this blog

Re: [MW:34105] SA266 GR4N 4 Cycle SPWHT

By Materials & Welding
Hi,  You are correct, Minimum refers to the one cycle for which this part will expose until final work shop PWHT. hence mill test certificate shall include this.  Max. SPWHT, refers to additional cycles of heat treatment that are reserved for future repairs during equipment lifetime.  Again, these simulated no. Of cycles shall be specified in MTC.  The idea is we need to make sure that steel mechanical properties are not compromised upon exposure to multiple repairs (i e 4 cycles in your case).  One could say, if steel is subjected to 4 cycles and is ok, then it should by defacto be good for one cycle, yet, this is wrong assumption cause mechanical problems and microstructure of materials varies accordingly based on no. Of cycles for which material will expose. This is apparent in alloy steel and especially for impact test values as an example.  In your case, this forged CS with properties before PWHT can be understood to be " as forged" condition (i.e. Wit...
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

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