Jeff,
There are a lot of materials that could fit this bill depending on the heat treat condition. Could you give us a little more background on the application and whether there are any other relevant parameters like impact toughness, fatigue, corrosion, etc? Is it operationally viable for you to heat treat whatever you wind up buying or do you need something that will have properties like that as-extruded/rolled? Something like quenched and tempered 1340 or 4130 would be relatively cheap and you'd get those properties fairly consistently in a 1" section but that may not optimize for all possible design variables. ASTM A182 is for high-temperature applications but it has a laundry list of alloys and their nominal mechanical properties if you want to peruse that (many are highly alloyed and more costly though). A668 is another option; that's mostly agnostic to chemistry and you just order by heat treatment / mechanical properties.
Something I would emphasize to your customer is that you're not going to be able to guarantee that something breaks at that exact stress unless you design that in mechanically (like an analog to a check valve). Do they want it to break, or are they designing this below yield? Real engineering materials are going to vary in their properties depending on a myriad of factors and expecting your material to break is a bit risky in my opinion, although of course there are many ways to skin a cat when it comes to design and many functional designs do incorporate weak links intended to break before the higher value components.
------------------------------
Sean Piper
Metallurgical Engineer
Ellwood City Forge
Houston TX
7248248333
------------------------------
Original Message:
Sent: 08-17-2023 14:02
From: Jeff Peterson
Subject: Yeild Strength and Ultimate Strength
Good Afternoon,
Need some help. I have a part that is 38.00 inches long 1.500 dia and its necked down to 1.00 inch in the center of the bar. The question I have is the customer does not state a material grade. They only provide Min Yield Strength of 66,000 psi and Max Ultimate strength of 96,000 psi. and a min Elongation 14% IN 2". They want the 1.00 diameter to Hold at 50,920 and Break at 76,320. Can anyone help with what grade of carbon steel that will meet this requirement.
Thank you
------------------------------
Jeff Peterson
owner
J&L Precision Manufacturing LLC
Brooklyn Heights OH
216-389-0067
------------------------------