I agree with arunmrao. An integrally cast test coupon needs to be physically continuous with the casting. A gated test coupon would be separated from the casting by the gating system. Both methods would ensure that the casting and the coupon were poured using the same metal, which you don't...
Cast C95400 typically contains small amounts of Zn, typically around 0.15 wt % or less. This commonly comes from the ingot manufacturers and contamination from other bronzes and brasses made in the same furnaces. I do not know of any problems with corrosion of this alloy resulting from Zn...
I have a customer who is having using overlaying part of a Alloy 625 casting with ERNiCrMo-4 (C-276) weld wire. I don't have a lot of details but they are seeing "tearing" (cracking?) at the weld-base metal joint. I realize that's a pretty vague description but has anyone encountered a similar...
I see this alloy has 2.5-4.0% aluminum. I really doubt you would find an ASTM specification for a cast version. You're likely looking at vacuum melting, and if the part you want can't be investment cast I'm not sure how much success you will have finding someone who can cast it at all. Not...
I'm not sure how much cost savings you are going to see trying to transition from cast 316 (CF8M) to cast 2205 (CD3MN) or CD4MCuN. Obviously, there is less alloying content but the duplexes are harder to cast well so there is less competition. I would guess it might be easier to find a...
While there are some minor differences in the chemistry between A351 and A743, I would be surprised if the foundry in question actually had separate grades of CF8M for each spec. It is trivial to adjust the internal chemistry ranges to work for either specification. I can't speak to all the...
There are plenty of steel foundries in the US running arc furnaces in the 10-12 ton range.
I can't speak to a direct comparison between induction and arc furnace but as others have noted you can get away with cheaper raw materials in an arc furnace than induction.
The austenitizing temperature and tempering temperatures listed are both given as minimums. You are allowed to go higher if needed. Classes B and D do not allow for air cool, hence the higher required strength levels. As metengr already said, the quench must take the temperature to below 500...
I have a question regarding the furnace temperature when a load is placed in it for PWHT. It is generically about any stainless steel, but more specifically cast pumps/valves in CA6NM (wrought equivalent 415). Metallurgically speaking, is there anything detrimental placing a load in the...
A conventional alloy, like steel, has a metallic bond that is characterized by an "electron cloud" where electrons are not strongly associated with a particular atomic nuclei.
Intermetallics contain bonds that are partially metallic, partially covalent, and partially ionic. This mixed...
Just my two cents,
The hour per inch rule is a pretty standard rule of thumb, but it's application is to ensure that the part is stress relieved throughout. Larger sections will reach the furnace temperature in the center more slowly than smaller section. The rate at which the center heats up...
I think what most people are trying to say is there isn't any reason asking for certs should cost you significantly more. I think there are two possibilities here.
1. There is some reason particular to your industry/suppliers/situation as to why they cannot easily supply certs for cold-worked...
