What is the most available chemistry for large cross section?
What is the most available chemistry for large cross section?
(OP)
We have or have tried three options as below:
1) 8630 Modified to higher alloy addition
2) 4340 or 4330V is unacceptable because of NACE 0175
3) just began to consider F22/F22V, not sure availablility yet.
Therefore, we only have one option which is 8630MOD right now, and it is great except availability. So any comments on above items or other ideas are highly appreciated.
Basically our design requirements include:
1) Diameter range: 10.0' ~ 14.0'.
2) NACE 0175 Part 2, therefore 22HRC max
3) as high as possible for YS, 80 or 85ksi preferred
4) Q&T condition because of low temperature CVN required
5) Off the shelf because of really low volume, just several hundreds of pounds each PO
1) 8630 Modified to higher alloy addition
2) 4340 or 4330V is unacceptable because of NACE 0175
3) just began to consider F22/F22V, not sure availablility yet.
Therefore, we only have one option which is 8630MOD right now, and it is great except availability. So any comments on above items or other ideas are highly appreciated.
Basically our design requirements include:
1) Diameter range: 10.0' ~ 14.0'.
2) NACE 0175 Part 2, therefore 22HRC max
3) as high as possible for YS, 80 or 85ksi preferred
4) Q&T condition because of low temperature CVN required
5) Off the shelf because of really low volume, just several hundreds of pounds each PO





RE: What is the most available chemistry for large cross section?
Maui
www.EngineeringMetallurgy.com
RE: What is the most available chemistry for large cross section?
RE: What is the most available chemistry for large cross section?
Sorry about that. It is used for oil and gas downhole tools, CNC machined parts all the time. The threemajor industry standards are API 6a, iso13628 and nace0175/iso13628. They are seeing up to 350f temperature, very high pressure, 10 or 15 ksi, and millions pound of tension possibly. The common material format is really thick tube, t/D up to 30+%. So we have to get bar stock then machine the core portion or rough-out machining then re-heat treat them. 1st approach is preferred (it is why I asked this question) as it is quicker.
The reason for low volume is because we are in prototype right now, but even in later production, our volume wont be anywhere even close to mill runs.
Any more informations I can provide, please let me know. This supposes to be a gerenal question as we have many parts having availability issue, not just one or two parts.
Actually we have 4th option:
4) martensitic 410, but concern about price and galling.
RE: What is the most available chemistry for large cross section?
RE: What is the most available chemistry for large cross section?
RE: What is the most available chemistry for large cross section?
RE: What is the most available chemistry for large cross section?
RE: What is the most available chemistry for large cross section?
I have two concerns about Boron steel: 1) I suspect that its harnability can be close to 4140 at most, so not enough for our sizes; 2) it will be too special, therefore, its availability will be pretty limited. But I will definitely take a closer look as my Timken handbook got a 86B30 chemistry.
The global market for our products is tiny - therefore, we don't and won't have a industry standard to address our material need. As stanweld said 8620/8630 is a major alloy being used. But actually what we have found out is that 8630MOD is the best and standard 8630 is still a bit off.
RE: What is the most available chemistry for large cross section?
rp
RE: What is the most available chemistry for large cross section?
Open die forging is a good idea. We have been looking at close die forging to get us to the close dimension for some expensive nickel alloys and then heat treatment, final machining, etc, whcih takes a long time. Open die forging absolutely is another manufacturing route for us, thank you very much.
RE: What is the most available chemistry for large cross section?
http://www.scotforge.com/sf_materials.htm