We had a supplier chose to use 304LP in lieu of 304L IAW ASTM A240.
1. Are there chemistry differences? Is Moly permitted in 304L?
2. Does 304LP meet ASTM A240? It isn't listed in the alloy table. The cert they send indicates it meets ASTM A240.
Besides the difference in chemistry and "somewhat reduced formability and corrosion resistance", are there any other reasons for concern with regard to 420F vs 420? I've got a part which has two hardness zones which is prone to failure. I know the free machining grades 303, 303Se, 347Se, etc...
Hi I'm looking for a thermoplastic material called Ceraban. Apparently we used to use it 40 years ago and I'm trying to find more information about it. The only thing I could find was in a old patent. See below. Apparently it is a liquid and then cures but it can be liquefied again using...
Looking for an upgrade to PH stainless which is more corrosion resistant (down hole conditions), stronger, and easily weldable (autogenously). Basically, I'd like a magnetic version of MP35N. Ideas??? I've looked at some of the duplex alloys and strength and weldability are of concern.
I'm trying to find a supplier of bar stock (2" Diameter) in this alloy. ATI seems like they might supply but I haven't had any luck. Suggestions??? A distributor would be fine since I don't need a huge quantity.
Ok, I've got inseperable assembly made from both 17-7 & 17-4. The 17-7 is in the TH1050 condition and the 17-4 is in the H1075 condition. I'm interested in what a solution anneal(1950F)+austenite condition(1750F-> -100F)+age(950F)will do to the properties of the 17-4? I know the double aging...
Hello,
I'm wondering if anyone has dealt with this alloy before. I've been to Cartech and have all of their spec sheets as well as spoken with some of the metalurgists at Carpenter. I was wondering if anyone has done testing or fielded hardware etc. using this alloy. I'm considering it for a...
I know the specs, AMS 2759/3 say 42-49 HRC but I've got some parts which are reported to be as high as HRC 57. I'm redoing the hardness testing on in stock inventory (I question the results given the shape of the part and wall thickness. These are tubular shaped parts which are made from bar...
Can anyone give me reason on why I shouldn't use this alloy/HT in a low intermittantly stressed (less 50% of yield) part in marine air environment (worst case, part is for Air Force Jet). I'm familar with the Kure Beach SCC studies which were sustained stresses much higher than this part would...
Why are these two steels prohibited by most Military M&P Specs? For example: MIL-STD-1587C (page 10) I'm most interested in stainless alloy 431. What would warrant a complete prohibition and if it were to be used what steps should be taken? (NDI...???)
I'm a mechanical so be gentle. Is there a compact battery powered strain gage which samples 10,000 S/sec, survive 100G min (500G pref.)and is able to store date for download later? Looking for four channels but would settle for two 2-channel modules. I only need 5-10 seconds of data. Must fit...
Besides hardness is there a method to determine heat treat condition (in parts) besides hardness testing. From what I've read, The TH and RH grades are easy to segregate from microstructure (TH = cat's and dog's). How about between different Aging temperatures (TH 950, 1000, 1050, 1075, 1100)...
My current process blanks this material post heat treatment due to constraints on tolerance. We understand there is risk to this especially if the material is hardened beyond limits specified in AMS 2759/3 (38-44 HRC). Since there is a .0045" dimensional change from condition A to T, I would...
I'm looking for a source for this type of maraging steel in resonable quantities 1000 lbs or less. This is standard T-200 Maraging Steel MIL-S-46850, Type III, Condition A1 except; chemical composition is modified as follows.
Cobalt .75% max
Titanium .6%-.8%
Charpy V-notch impact strength in...
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Folks,
I just received the final report from the lab. The failed link is referred to as Link #79 Some conclusions from the lab:
1. Link #79 exhibited a shallow linear surface discontinuity from the original strip rolling process. The...
Here's the story. This parts are made using 17-7ph sheet stock (AMS5528 or MIL-S-25043) which is cut into strips and then heat treated to TH1050 IAW Mil-H-6875. The parts are then formed using fine blanking process. The failure occured while theres parts are in opperation. They link together...
