4130 flame hardening
4130 flame hardening
(OP)
I am attemping to allieviate erosion in several control valves by sleeving the body with a hardened alloy. I have settled on 4130 as it is all that is available short of boring solid round stock. I am considering flame hardening these sleeves to obtain maximum hardness. Wall thickness is .125, 3" O.D. I think that raising the temp to 1600 and then water quench will give me a hardness of at least 35 Rc. Can anyone comment on this. Will I be able to weld the sleeves to the 316L body after hardening, Will the diameter of the sleeve be greater due to Martensite presence, any guesses on shrinkage or growth?
Thanks
Thanks





RE: 4130 flame hardening
RE: 4130 flame hardening
What is the service application and are you sure it is erosion? I would presume these valves are installed and removal for corrective action would be cost prohibitive.
If you need erosion protection, I would look at alternative surface hardening treatments (like nitriding) using a 316L stainless steel sleeve to increase the surface hardness instead of using a low alloy sleeve material. This way you have similar materials between the sleeve and valve body regarding thermal expansion in service (if applicable) and installation of the hardened 316L sleeve would be easier. Something to consider.
RE: 4130 flame hardening
RE: 4130 flame hardening
RE: 4130 flame hardening
RE: 4130 flame hardening
I think I should back up for a moment, with all this great information, and ask, is there a better alloy out there that is available. As i mentioned finding any sort of tubing with a <.250 wall is difficult, and I havent found anyone loccally who who be willing to bore round stock, especially if it is some difficult alloy. Is there an alloy that comes forged, or DOM that has an inherent hardness? I have considered using inside race material, however in this particular situation, lead times are prohib
ative, as it is non standard size. Thanks again.
RE: 4130 flame hardening
You can contact the following company for information.
They did have a great tech group at one time, hopefully they still do.
http://www.stellite.com/default.asp
RE: 4130 flame hardening