Best steel material for 300 deg C

Madis Reivik · Mar 3, 2020

Hello !

We have to make some small washers which will work under spring load and the temperature will be cycled between room temp and 300 deg Celsius.
Brass washers did not work, spring end "ate" the washer

So perhaps stainless works better.

AISI304 or AISI316 or AISI316Ti ? I know that molten lead pumps are made of 316Ti, but here the load is lower.

spring is made of Inconel, force is small.

Thanks !

thermite · Mar 3, 2020

Madis Reivik said:
Hello !

We have to make some small washers which will work under spring load and the temperature will be cycled between room temp and 300 deg Celsius.
Brass washers did not work, spring end "ate" the washer

So perhaps stainless works better.

AISI304 or AISI316 or AISI316Ti ? I know that molten lead pumps are made of 316Ti, but here the load is lower.

spring is made of Inconel, force is small.

Thanks !

So how many and how LARGE? And what's wrong with Inconel on Inconel?

Or pre-fabbed ceramic disks, perhaps even stock items, off the shelf?

Or surplused molybdenum laser target disks, original mothership gone stale?

steve-l · Mar 3, 2020

Thermite is correct, but the bigger issue is corrosion for a consideration. In that light I would favor 316, 316L and 316Ti because of the cost consideration over Inconel.

thermite · Mar 3, 2020

steve-l said:
Thermite is correct, but the bigger issue is corrosion for a consideration. In that light I would favor 316, 316L and 316Ti because of the cost consideration over Inconel.

Bitch to work, too, Inconel, and that is also "money".

Wonder if yah could stamp Monel K-500 'stead of machinin'?

Madis Reivik · Mar 3, 2020

8mm with 3mm holes and little "collar" to keep spring in place

So 316 would be a good choice ?

Gordon Heaton · Mar 3, 2020

Is this a valving operation? If so, what gasses or liquids might come in contact with the spring and washer?

thermite · Mar 3, 2020

Madis Reivik said:
8mm with 3mm holes and little "collar" to keep spring in place

So 316 would be a good choice ?

Better info, but still not enough.

"Valving" or bleed-off action? Hot chemicals in the environment? Erosive flow through the holes or radially at significant velocity? Hammering/vibration part of the tasking?

Inconel spring might send the message that Inconel could also be justified for the warsher, pain in the arse or not?

See also use of Stellite for exhaust valve seats, IC engines. One more pain in the arse as had right grand "payback" to make it come good.

Stellite / Hastelloy might be another option?

What is the Difference Between Hastelloy(R) and Incoloy(R)? - Continental Steel & Tube Company

Call me metallurgically paranoid, but any of the "vanilla" Stainless alloys just whisper "too easy, won't last" where Inconel is already a significant player.

Time for a chat with the designer? Or more research if you BE he?

mhajicek · Mar 3, 2020

I'd try 17-4 H900.

johnoder · Mar 4, 2020

You are worried about 572 F? Amazing

Check it ut

ASME SA387 Plate - SA387 Plate Grade 11 & 22 Supplier | Universal Steel America

ph

Gordon Heaton · Mar 4, 2020

johnoder said:
You are worried about 572 F? Amazing

Yeah. That could affect some springs, but certain caustic or corrosive elements are much more active at that temp vs room temp. Hence my question in #6.

Panza · Mar 5, 2020

What about some tool-steel for hot working conditions ? Like Uddeholm Orvar for example.

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Best steel material for 300 deg C

Madis Reivik

Hot Rolled

thermite

Diamond

steve-l

Titanium

thermite

Diamond

Madis Reivik

Hot Rolled

Gordon Heaton

Titanium

thermite

Diamond

mhajicek

Diamond

johnoder

Diamond

Gordon Heaton

Titanium

Panza

Stainless

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