Steel with yield strength in the range of 75,000 to 85,000 PSI

[John2004]

Hi everyone,

Can anyone please recommend a steel that is reasonably easy to machine and work with, & that has a yield strength in the range of at least 75,000 to 85,000 PSI ? I would rather not get into heat treating in order to achieve the desired yield strength if possible.

The small part would likely be made from flat plate stock, and could be made from a block 2.25" wide X 2" long X 1" high.

Does anyone know of a reliable web site or metal supply site that will give the price for the steel in flat and/or round stock, and then give the specs for the steel as sold, such as yield strength, machinability rating, general technical data on the steel etc. ?

I would like to be able to specify something the machinist can readily obtain, and obtain at reasonable cost. It seems the same grade of steel can come in different conditions or be processed in different ways that effect yield strength, so I need to be able to specify those conditions / processes and also know that the steel is available as flat or round stock as required.

http://www.matweb.com

has much technical data, but it does not really help me narrow things down such as, will the material be hard to get, what will it cost, does it come in flat or round stock as required, & also in the condition to meet the required yield strength, etc..

I would like to be able to specify the exact grade and conditions so that I can rely on the yield strength being met, and know that the steel is available in flat or round stock as required.

Any recommendations or web sites you could direct me to would be appreciated.

Thanks
John

 

[metengr]

Review the web site below, which is one of many. Take your pick of any of the high strength low alloy (HSLA) plate steels used in structural applications;

http://www.intlsteel.com/content/products/prod_plate_lit.aspx

 

[John2004]

Hi everyone,

Thanks for your reply metengr, I will check out the site you gave.

So far, it looks like I might use 1080 as rolled, with a yield of 85,000 PSI or 4140 normalized with a yield of 95,000 PSI.

4140 normalized has a machining rating of 65 % Based on AISI 1212 as 100% machinability. I'm not sure how the machinability 1080 compares.

I may find better options after looking at the site you gave.

Thanks again,
John

 

[JStephen]

It can be a challenge finding small quantities of some of these materials. If you just need a test piece, try McMaster-Carr- they sell some various alloys in bar stock, including 4140.

 

[Cockroach]

John2004 is absolutely correct.

You can use ASTM A4140/4130 HRc 18-22. Most commercially availbable steels would categorize this as L80, i.e. 80 ksi yield, the lower end of your requirement.

If you need something a little harder, then P110 would be ASTM A4140/4130 HRc 28-32. This comes in at 110 ksi yield which is to the top side of your requirement.

Kenneth J Hueston, PEng
Principal
Sturni-Hueston Engineering Inc
Edmonton, Alberta Canada

 

[GBor]

Military shipyards use a lot of HY80, HY100, and various HSLA's...I would think they are probably pretty easy to find.

 

[Philrock]

SAE 1045 Sy = 85 ksi
SAE 4130 condition F Sy = 100 ksi

 

[limct]

SAE 1144, yield strength = 89000 psi
or
ETG100 of Steeltec Switzerland.

Both are high strength machining grades.

Good luck.

Best regards,
ct

 

[rob768]

When will you yanks ever learn to use the metric system, afraid to loose another shuttle?

For high strength, good machinibilty we something use 17-4PH or equivalent.

 

[swall]

Not the Shuttle--it was the Mars lander that was lost due to a landing program in metric and instructions transmitted in English units or something like that.

 

[rob768]

Information gets scrambled while travelling over sea..

 

[JStephen]

Alas, after years of having the SI system drilled into my head 20 years ago, I got out in the real world only to find the metric countries didn't use the SI system- they too were stuck in the stone age with kgf/cm^2 and whatnot.

 

[rob768]

No problems with that, just in older text books, and some of the ancient engineers still around.
Particularly in doing torsional vibrations, you'd be surprised on the number of errors in converting I have witnessed, some with rather costly results too.
But I keep dreaming of a better world witn only one system of units (although that seems pretty trivial these days)