Heat treatment of UNS S17400

[metalonis]

Is there a published standard tolerance on the precipitation hardening temperature for this material? For example, the condition H1150 aging temperature is (of course) 1150°F, but is that ±25°F, ±15°F or what? I've seen anywhere from ±1°F to ±50°F in manufacturers' literature. ASME SA-564 states that these are "... suggested temperatures and may be varied to obtain required tensile properties." I'm trying to develope an internal standard and would like a something definitive to base it on.

 

[NickE]

Go here for what AK steel says:

http://www.aksteel.com/pdf/markets_products/stainless/precipitation/17-4_PH_Data_Bulletin.pdf

There is another spec. I think its an AMS spec. I dont remember offhand and will post up later to add more info.

nick

 

[EdStainless]

AMS 2759/3 B
We have always ued used +/-25F for the anneal and +/-10 for the age.

http://www.alleghenytechnologies.com/ludlum/pages/products/xq/asp/P.112/qx/product.html#

and check out the Blue Sheet

= = = = = = = = = = = = = = = = = = = =
Corrosion never sleeps, but it can be managed.

http://www.trenttube.com/Trent/tech_form.htm

 

[TVP]

SAE AMS 2759/3 is now at revision C, not B, but the limits are the same as EdStainless described: when the furnace temperature is less than 1300 F, the tolerance is + 10 F (+ 6C).

 

[unclesyd]

It is hard to generalize the aging process for 17/4.

Based on the hardness range you will get when you age 17/4 we have never found it necessary to hold the temperature closer than ±25°F when we called out a age hardening procedure for outside work.
Be careful of people that don't have a circulating oven for the aging process.

If you are going to use 17/4 as a shaft the aging temperature needs to be at or above H1100. H1100 was our minimum aging treatment unless there was a review of the component by our group. If you can stay away from the H900 treatment. I seen a lot of grief come from trying to use 17/4 in this condition.

Could you give a little more information on what type components you are considering.