Friends,
We have a situation in which, we have welded SS 2205 (UNS S2205) grade duplex steel to Nitronic 50 (UNS S20910) grade of steel. The whole unit was then subjected to a corrosion test per ASTM A923 and we have observed extensive pitting corrosion on the Nitronic side of the weld. My...
Hi All!
We intend to ask for deviation on the chemistry. There are a few more parts that require ASTM A470 in sufficient quantities and we have no problem with them. This is something that we are willing to accomodate if we find the standard composition (or slightly modified but available) so...
Hi All!
We are working on a job to make forgings to a GE spec BA50A420.
We are at a loss to understand to what standard spec, such as AISI,ASTM,SAE or UNS can this grade be purchased.
The percentage composition of key elements is as follows;
C 0.25% - 0.33% - Mn 0.20% - 0.80% - Si 0.35% max...
Thanks Unclesyd, Terry and mfgenggear for your valuable posts. That was really helpful.
To answer all your questions,
we have no clue why the customer wants us to do the the sub-zero quench. My guess is that since they are a manufacturing set-up supplying to their customer, the sub-zero...
Hi All!
We made our first flange in the 17-4PH / AISI 630 grade. After forging we performed post forge thermal treatment and later aged it to achieve a hardness of 330/335 BHN. So far so good.
In the next step, we intend to machine the part and then subject it to a sub-zero quench at -60 deg...
Metengr,
Yes, you are correct the hardness we achieved is 161 BHN in the normalized and tempered condition okayed for SA182-F11 Class 1. My bad-it was a typo.
We are heat treating it again to achieve SA182 F11 Class 2 properties. This time it will be oil quenched and tempered in atmosphere...
Thanks for the useful post, Metengr.
For SA182 class 2 we normally quench and temper and never had any problems achieving desired properties. In this particular case it was customer requirement to normalize and temper for Class 1 properties. We had no problem with that too. So the parts...
Hi All!
We have some parts that are finish machined and made of SA182 F11 material. These were originally qualified for SA182 F11 - Cl 1, in the Normalized and tempered condition. Now the customer wants it to be qualified as SA182 F11 - Cl 2. We need to quench and temper the parts that are...
Hi All!
One of our customer needs a forged nozzle for a high temperature (1863 deg F)and pressure (100 psi) application. Customer wants us to quote with suitable material. We are planning to offer Incoloy- 800HT for this application. However we have not been able to find any data to...
Corypad,
Thanks for the response. Yes there is a typo.
The forged finish is 17" X 18.125" X 17.75" Long.
I see that you are calculating the start and finish,
while I'm taking all intermediate stages in to consideration in my calculation. By intermediate stages I mean the multiple reductions...
Friends!
I have a question (probably a dumb one) regarding Forging work ratio. We have a situation with a new product that we forge from a rectangular Continuous cast bloom 23.6" X 14.6" cut to 17.125" length. The forging was finished to size 17"X 18.125" X 17.125" in about 38 reduction steps...
Hello Friends!
I have a question regarding SA182-F51 duplex SS.
We have a customer asking for charpy values of 25/33Ft-lb at -50 deg F. We have no exposure to this steel and we are not sure if this is achievable. In fact we need to carry out heat treatment trials to achieve a 35 -50% Ferrite...
Hi Guys,
What would be a good place to get some information on the machinability of X4CrNiMo 16-5-1 grade steel?? I'm not finding relevant info' on Google. Appreciate any help or pointers in this regard.
Regards
CoryPad and TVP - Thanks for the useful information.
Yes we are considering alternatives for X4CrNiMo 16-5-1 on account of the long leadtimes for procurement from Europe.
Local mills are prepared to cast them if we have the right quantities, which, unfortunately, we do not have. We shall try...
Thanks TVP for the link and info' on X4CrNiM0 16-5-1.
I checked on Carpenters data sheet and found a somewhat similar steel (a casting variety, I'm told) conforming to UNS S45000. I was wondering if this grade could be offered
and yet achieve mechanicals (YS 108 ksi, Hardness 32-35 HRC,
Charpy...
Hi All!
We are looking for an equivalent AISI grade for the subject material. Would anybody know if there is an equivalent AISI/UNS number. It is also identified as X4CrNiMo 16-5-1, which simply means 16% Cr, 5% Ni & 1% Mo. Is there any mill in the US making this grade?
I guess the next...
Hi All!
Can somebody tell me what is the contribution of Niobium/Columbium to the Jominy hardenability equation. For instance the Carbon contribution is;
C=2*(SQRT(0.024*C%)).
I haven't found the equation for Nb/Cb. Any help??
Thanks in advance,
Cheers
SJones is right in his belief that I was referring to parent metal additions. We are seeking to get the Nb% raised from 0.06 max to 0.08% max and Cr% from 1.65% max to 2.25% max by our customer. V% has been reduced to 0.008% max. Our main objective is to get thro' CTOD tests with a reasonable...
Thanks a bunch SJones!
The post was really helpful. The acceptance criterion for CTOD is 0.049" (1.25mm) at -10deg. C (14deg F). Hope it does not pose a problem passing the test with Nb at 0.08% max.
Regards
