Thermal spray coating for Nitriding
04-24-2015, 09:03 AM,
#1
Thermal spray coating for Nitriding
Hi,

Customer wants a replacement for nitriding on certain small SS 304 parts, working in high temperature (<800 deg C). I don't think surface finish is a criteria

How would a Cr-C HVOF work?

Regards

Shantanu Newar
Reply
04-24-2015, 09:58 AM,
#2
RE: Thermal spray coating for Nitriding
(04-24-2015, 09:03 AM)shantanu Wrote: Hi,

Customer wants a replacement for nitriding on certain small SS 304 parts, working in high temperature (<800 deg C). I don't think surface finish is a criteria

How would a Cr-C HVOF work?

Regards

Shantanu Newar

Hi shantanu,
SS304 steel has a coefficient of linear thermal expansion of 17-18x10-6K-1, and the coating Cr3C2-Ni80Cr20 - about 9x10-6K-1. Therefore, even if it were possible to obtain a perfect coating of a Cr3C2-NiCr on steel SS 304 is still cracked by heating to 800°C.

Regards
Reply
04-24-2015, 11:02 AM,
#3
RE: Thermal spray coating for Nitriding
Hi Shantanu,

We have sprayed an HVOF Inconel 625 for a part with similar operating conditions and works well!
Reply
04-24-2015, 11:13 AM,
#4
RE: Thermal spray coating for Nitriding
(04-24-2015, 11:02 AM)Joris Kraak Wrote: Hi Shantanu,

We have sprayed an HVOF Inconel 625 for a part with similar operating conditions and works well!

Many thanks for a quick response. Would you say an Inconel HVOF be a direct replacement to Nitriding on SS 304?

Reply
04-25-2015, 08:47 AM,
#5
RE: Thermal spray coating for Nitriding
It depends on what customer is looking but we have one customer manufacturing molds for BMW and he used to nitride these parts. After a period of using the surface is worn out and we use Inconel 625 to rebuild the surface. After this treatment the customer told us he did not use nitriding anymore so that solution works for him.

I can imagine it depends on the application and for this reason an Inconel coating cannot be considered as a standard replacement for nitriding.






(04-24-2015, 11:13 AM)shantanu Wrote:
(04-24-2015, 11:02 AM)Joris Kraak Wrote: Hi Shantanu,

We have sprayed an HVOF Inconel 625 for a part with similar operating conditions and works well!

Many thanks for a quick response. Would you say an Inconel HVOF be a direct replacement to Nitriding on SS 304?

Reply




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